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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen master] x86/cpu-policy: move CPU policy library code
commit 7326c1725432166cbb7a284df78c373b95be82aa
Author: Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Wed Feb 25 12:31:08 2026 +0100
Commit: Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Feb 25 12:31:08 2026 +0100
x86/cpu-policy: move CPU policy library code
... to a dedicated subdir of x86's private lib/ sub-tree.
For the CPU policy harnesses and libxenguest use $(lib-y) as set by the
new Makefile.common, whereas for the emulator harnesses stick to building
just cpuid.o for the time being.
Requested-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
tools/fuzz/cpu-policy/Makefile | 7 +-
tools/fuzz/x86_instruction_emulator/Makefile | 2 +-
tools/libs/guest/Makefile.common | 7 +-
tools/tests/cpu-policy/Makefile | 7 +-
tools/tests/x86_emulator/Makefile | 2 +-
xen/arch/x86/arch.mk | 1 +
xen/arch/x86/lib/Makefile | 2 +
xen/arch/x86/lib/cpu-policy/Makefile | 1 +
xen/arch/x86/lib/cpu-policy/Makefile.common | 3 +
xen/arch/x86/lib/cpu-policy/cpuid.c | 559 +++++++++++++++++++++++++++
xen/arch/x86/lib/cpu-policy/msr.c | 130 +++++++
xen/arch/x86/lib/cpu-policy/policy.c | 54 +++
xen/arch/x86/lib/cpu-policy/private.h | 78 ++++
xen/lib/Makefile | 2 -
xen/lib/x86/Makefile | 3 -
xen/lib/x86/cpuid.c | 559 ---------------------------
xen/lib/x86/msr.c | 130 -------
xen/lib/x86/policy.c | 54 ---
xen/lib/x86/private.h | 78 ----
19 files changed, 845 insertions(+), 834 deletions(-)
diff --git a/tools/fuzz/cpu-policy/Makefile b/tools/fuzz/cpu-policy/Makefile
index 6e7743e0aa..76ecf20e8d 100644
--- a/tools/fuzz/cpu-policy/Makefile
+++ b/tools/fuzz/cpu-policy/Makefile
@@ -20,9 +20,12 @@ install: all
CFLAGS += $(CFLAGS_xeninclude) -D__XEN_TOOLS__
CFLAGS += $(APPEND_CFLAGS) -Og
-vpath %.c ../../../xen/lib/x86
+vpath %.c $(XEN_ROOT)/xen/arch/x86/lib/cpu-policy
-afl-policy-fuzzer: afl-policy-fuzzer.o msr.o cpuid.o
+lib-y :=
+include $(XEN_ROOT)/xen/arch/x86/lib/cpu-policy/Makefile.common
+
+afl-policy-fuzzer: afl-policy-fuzzer.o $(lib-y)
$(CC) $(CFLAGS) $^ -o $@
-include $(DEPS_INCLUDE)
diff --git a/tools/fuzz/x86_instruction_emulator/Makefile
b/tools/fuzz/x86_instruction_emulator/Makefile
index d104b15f4f..4e4877a203 100644
--- a/tools/fuzz/x86_instruction_emulator/Makefile
+++ b/tools/fuzz/x86_instruction_emulator/Makefile
@@ -21,7 +21,7 @@ vpath %.h ../../tests/x86_emulator
CFLAGS += -iquote ../../tests/x86_emulator
# Add libx86 to the build
-vpath %.c $(XEN_ROOT)/xen/lib/x86
+vpath %.c $(XEN_ROOT)/xen/arch/x86/lib/cpu-policy
x86_emulate:
mkdir -p $@
diff --git a/tools/libs/guest/Makefile.common b/tools/libs/guest/Makefile.common
index a026a2f662..b928a4a246 100644
--- a/tools/libs/guest/Makefile.common
+++ b/tools/libs/guest/Makefile.common
@@ -33,9 +33,12 @@ LIBELF_OBJS += libelf-dominfo.o
OBJS-y += $(LIBELF_OBJS)
ifeq ($(CONFIG_X86),y) # Add libx86 to the build
-vpath %.c ../../../xen/lib/x86
+vpath %.c $(XEN_ROOT)/xen/arch/x86/lib/cpu-policy
-OBJS-y += cpuid.o msr.o policy.o
+lib-y :=
+include $(XEN_ROOT)/xen/arch/x86/lib/cpu-policy/Makefile.common
+
+OBJS-y += $(lib-y)
endif
# new domain builder
diff --git a/tools/tests/cpu-policy/Makefile b/tools/tests/cpu-policy/Makefile
index 24f87e2eca..d8e4d222f4 100644
--- a/tools/tests/cpu-policy/Makefile
+++ b/tools/tests/cpu-policy/Makefile
@@ -42,11 +42,14 @@ CFLAGS += $(APPEND_CFLAGS)
LDFLAGS += $(APPEND_LDFLAGS)
-vpath %.c ../../../xen/lib/x86
+vpath %.c $(XEN_ROOT)/xen/arch/x86/lib/cpu-policy
+
+lib-y :=
+include $(XEN_ROOT)/xen/arch/x86/lib/cpu-policy/Makefile.common
%.o: Makefile
-test-cpu-policy: test-cpu-policy.o msr.o cpuid.o policy.o
+test-cpu-policy: test-cpu-policy.o $(lib-y)
$(CC) $^ -o $@ $(LDFLAGS)
-include $(DEPS_INCLUDE)
diff --git a/tools/tests/x86_emulator/Makefile
b/tools/tests/x86_emulator/Makefile
index 376cfe244d..e18725d0c3 100644
--- a/tools/tests/x86_emulator/Makefile
+++ b/tools/tests/x86_emulator/Makefile
@@ -17,7 +17,7 @@ vpath x86_emulate/%.h $(XEN_ROOT)/xen/arch/x86
HOSTCFLAGS += -iquote $(XEN_ROOT)/xen/arch/x86
# Add libx86 to the build
-vpath %.c $(XEN_ROOT)/xen/lib/x86
+vpath %.c $(XEN_ROOT)/xen/arch/x86/lib/cpu-policy
CFLAGS += $(CFLAGS_xeninclude)
diff --git a/xen/arch/x86/arch.mk b/xen/arch/x86/arch.mk
index 37fe65bc13..0b42e6312f 100644
--- a/xen/arch/x86/arch.mk
+++ b/xen/arch/x86/arch.mk
@@ -4,6 +4,7 @@
export XEN_IMG_OFFSET := 0x200000
ARCH_LIBS-y += arch/x86/lib/lib.a
+ARCH_LIBS-y += arch/x86/lib/cpu-policy/lib.a
CFLAGS += -DXEN_IMG_OFFSET=$(XEN_IMG_OFFSET)
diff --git a/xen/arch/x86/lib/Makefile b/xen/arch/x86/lib/Makefile
index b9a65c662a..fe9a271879 100644
--- a/xen/arch/x86/lib/Makefile
+++ b/xen/arch/x86/lib/Makefile
@@ -6,3 +6,5 @@ lib-y += generic-hweightl.o
lib-y += memcpy.o
lib-y += memset.o
lib-y += scrub-page.o
+
+obj-y += cpu-policy/
diff --git a/xen/arch/x86/lib/cpu-policy/Makefile
b/xen/arch/x86/lib/cpu-policy/Makefile
new file mode 100644
index 0000000000..b12cf7836d
--- /dev/null
+++ b/xen/arch/x86/lib/cpu-policy/Makefile
@@ -0,0 +1 @@
+include $(srcdir)/Makefile.common
diff --git a/xen/arch/x86/lib/cpu-policy/Makefile.common
b/xen/arch/x86/lib/cpu-policy/Makefile.common
new file mode 100644
index 0000000000..35475af780
--- /dev/null
+++ b/xen/arch/x86/lib/cpu-policy/Makefile.common
@@ -0,0 +1,3 @@
+lib-y += cpuid.o
+lib-y += msr.o
+lib-y += policy.o
diff --git a/xen/arch/x86/lib/cpu-policy/cpuid.c
b/xen/arch/x86/lib/cpu-policy/cpuid.c
new file mode 100644
index 0000000000..6298d051f2
--- /dev/null
+++ b/xen/arch/x86/lib/cpu-policy/cpuid.c
@@ -0,0 +1,559 @@
+#include "private.h"
+
+#include <xen/lib/x86/cpu-policy.h>
+
+static void zero_leaves(struct cpuid_leaf *l,
+ unsigned int first, unsigned int last)
+{
+ if ( first <= last )
+ memset(&l[first], 0, sizeof(*l) * (last - first + 1));
+}
+
+unsigned int x86_cpuid_lookup_vendor(uint32_t ebx, uint32_t ecx, uint32_t edx)
+{
+ switch ( ebx )
+ {
+ case X86_VENDOR_INTEL_EBX:
+ if ( ecx == X86_VENDOR_INTEL_ECX &&
+ edx == X86_VENDOR_INTEL_EDX )
+ return X86_VENDOR_INTEL;
+ break;
+
+ case X86_VENDOR_AMD_EBX:
+ if ( ecx == X86_VENDOR_AMD_ECX &&
+ edx == X86_VENDOR_AMD_EDX )
+ return X86_VENDOR_AMD;
+ break;
+
+ case X86_VENDOR_CENTAUR_EBX:
+ if ( ecx == X86_VENDOR_CENTAUR_ECX &&
+ edx == X86_VENDOR_CENTAUR_EDX )
+ return X86_VENDOR_CENTAUR;
+ break;
+
+ case X86_VENDOR_SHANGHAI_EBX:
+ if ( ecx == X86_VENDOR_SHANGHAI_ECX &&
+ edx == X86_VENDOR_SHANGHAI_EDX )
+ return X86_VENDOR_SHANGHAI;
+ break;
+
+ case X86_VENDOR_HYGON_EBX:
+ if ( ecx == X86_VENDOR_HYGON_ECX &&
+ edx == X86_VENDOR_HYGON_EDX )
+ return X86_VENDOR_HYGON;
+ break;
+ }
+
+ return X86_VENDOR_UNKNOWN;
+}
+
+const char *x86_cpuid_vendor_to_str(unsigned int vendor)
+{
+ switch ( vendor )
+ {
+ case X86_VENDOR_INTEL: return "Intel";
+ case X86_VENDOR_AMD: return "AMD";
+ case X86_VENDOR_CENTAUR: return "Centaur";
+ case X86_VENDOR_SHANGHAI: return "Shanghai";
+ case X86_VENDOR_HYGON: return "Hygon";
+ default: return "Unknown";
+ }
+}
+
+void x86_cpu_policy_to_featureset(
+ const struct cpu_policy *p, uint32_t fs[FEATURESET_NR_ENTRIES])
+{
+ fs[FEATURESET_1d] = p->basic._1d;
+ fs[FEATURESET_1c] = p->basic._1c;
+ fs[FEATURESET_e1d] = p->extd.e1d;
+ fs[FEATURESET_e1c] = p->extd.e1c;
+ fs[FEATURESET_Da1] = p->xstate.Da1;
+ fs[FEATURESET_7b0] = p->feat._7b0;
+ fs[FEATURESET_7c0] = p->feat._7c0;
+ fs[FEATURESET_e7d] = p->extd.e7d;
+ fs[FEATURESET_e8b] = p->extd.e8b;
+ fs[FEATURESET_7d0] = p->feat._7d0;
+ fs[FEATURESET_7a1] = p->feat._7a1;
+ fs[FEATURESET_e21a] = p->extd.e21a;
+ fs[FEATURESET_7b1] = p->feat._7b1;
+ fs[FEATURESET_7d2] = p->feat._7d2;
+ fs[FEATURESET_7c1] = p->feat._7c1;
+ fs[FEATURESET_7d1] = p->feat._7d1;
+ fs[FEATURESET_m10Al] = p->arch_caps.lo;
+ fs[FEATURESET_m10Ah] = p->arch_caps.hi;
+ fs[FEATURESET_e21c] = p->extd.e21c;
+}
+
+void x86_cpu_featureset_to_policy(
+ const uint32_t fs[FEATURESET_NR_ENTRIES], struct cpu_policy *p)
+{
+ p->basic._1d = fs[FEATURESET_1d];
+ p->basic._1c = fs[FEATURESET_1c];
+ p->extd.e1d = fs[FEATURESET_e1d];
+ p->extd.e1c = fs[FEATURESET_e1c];
+ p->xstate.Da1 = fs[FEATURESET_Da1];
+ p->feat._7b0 = fs[FEATURESET_7b0];
+ p->feat._7c0 = fs[FEATURESET_7c0];
+ p->extd.e7d = fs[FEATURESET_e7d];
+ p->extd.e8b = fs[FEATURESET_e8b];
+ p->feat._7d0 = fs[FEATURESET_7d0];
+ p->feat._7a1 = fs[FEATURESET_7a1];
+ p->extd.e21a = fs[FEATURESET_e21a];
+ p->feat._7b1 = fs[FEATURESET_7b1];
+ p->feat._7d2 = fs[FEATURESET_7d2];
+ p->feat._7c1 = fs[FEATURESET_7c1];
+ p->feat._7d1 = fs[FEATURESET_7d1];
+ p->arch_caps.lo = fs[FEATURESET_m10Al];
+ p->arch_caps.hi = fs[FEATURESET_m10Ah];
+ p->extd.e21c = fs[FEATURESET_e21c];
+}
+
+void x86_cpu_policy_recalc_synth(struct cpu_policy *p)
+{
+ p->x86_vendor = x86_cpuid_lookup_vendor(
+ p->basic.vendor_ebx, p->basic.vendor_ecx, p->basic.vendor_edx);
+}
+
+void x86_cpu_policy_fill_native(struct cpu_policy *p)
+{
+ unsigned int i;
+
+ cpuid_leaf(0, &p->basic.raw[0]);
+ for ( i = 1; i <= MIN(p->basic.max_leaf,
+ ARRAY_SIZE(p->basic.raw) - 1); ++i )
+ {
+ switch ( i )
+ {
+ case 0x4: case 0x7: case 0xb: case 0xd:
+ /* Multi-invocation leaves. Deferred. */
+ continue;
+ }
+
+ cpuid_leaf(i, &p->basic.raw[i]);
+ }
+
+ if ( p->basic.max_leaf >= 4 )
+ {
+ for ( i = 0; i < ARRAY_SIZE(p->cache.raw); ++i )
+ {
+ union {
+ struct cpuid_leaf l;
+ struct cpuid_cache_leaf c;
+ } u;
+
+ cpuid_count_leaf(4, i, &u.l);
+
+ if ( u.c.type == 0 )
+ break;
+
+ p->cache.subleaf[i] = u.c;
+ }
+
+ /*
+ * The choice of CPUID_GUEST_NR_CACHE is arbitrary. It is expected
+ * that it will eventually need increasing for future hardware.
+ */
+#ifdef __XEN__
+ if ( i == ARRAY_SIZE(p->cache.raw) )
+ printk(XENLOG_WARNING
+ "CPUID: Insufficient Leaf 4 space for this hardware\n");
+#endif
+ }
+
+ if ( p->basic.max_leaf >= 7 )
+ {
+ cpuid_count_leaf(7, 0, &p->feat.raw[0]);
+
+ for ( i = 1; i <= MIN(p->feat.max_subleaf,
+ ARRAY_SIZE(p->feat.raw) - 1); ++i )
+ cpuid_count_leaf(7, i, &p->feat.raw[i]);
+ }
+
+ if ( p->basic.max_leaf >= 0xb )
+ {
+ union {
+ struct cpuid_leaf l;
+ struct cpuid_topo_leaf t;
+ } u;
+
+ for ( i = 0; i < ARRAY_SIZE(p->topo.raw); ++i )
+ {
+ cpuid_count_leaf(0xb, i, &u.l);
+
+ if ( u.t.type == 0 )
+ break;
+
+ p->topo.subleaf[i] = u.t;
+ }
+
+ /*
+ * The choice of CPUID_GUEST_NR_TOPO is per the manual. It may need
+ * to grow for future hardware.
+ */
+#ifdef __XEN__
+ if ( i == ARRAY_SIZE(p->topo.raw) &&
+ (cpuid_count_leaf(0xb, i, &u.l), u.t.type != 0) )
+ printk(XENLOG_WARNING
+ "CPUID: Insufficient Leaf 0xb space for this hardware\n");
+#endif
+ }
+
+ if ( p->basic.max_leaf >= 0xd )
+ {
+ uint64_t xstates;
+
+ cpuid_count_leaf(0xd, 0, &p->xstate.raw[0]);
+ cpuid_count_leaf(0xd, 1, &p->xstate.raw[1]);
+
+ xstates = cpu_policy_xstates(p);
+
+ /* This logic will probably need adjusting when XCR0[63] gets used. */
+ BUILD_BUG_ON(ARRAY_SIZE(p->xstate.raw) > 63);
+
+ for ( i = 2; i < min_t(unsigned int, 63,
+ ARRAY_SIZE(p->xstate.raw)); ++i )
+ {
+ if ( xstates & (1ULL << i) )
+ cpuid_count_leaf(0xd, i, &p->xstate.raw[i]);
+ }
+ }
+
+ /* Extended leaves. */
+ cpuid_leaf(0x80000000U, &p->extd.raw[0]);
+ for ( i = 1; i <= MIN(p->extd.max_leaf & 0xffffU,
+ ARRAY_SIZE(p->extd.raw) - 1); ++i )
+ cpuid_leaf(0x80000000U + i, &p->extd.raw[i]);
+
+ /* Don't report leaves from possible lower level hypervisor, for now. */
+ p->hv_limit = 0;
+ p->hv2_limit = 0;
+
+#ifdef __XEN__
+ /* TODO MSR_PLATFORM_INFO */
+
+ if ( p->feat.arch_caps )
+ rdmsrl(MSR_ARCH_CAPABILITIES, p->arch_caps.raw);
+#endif
+
+ x86_cpu_policy_recalc_synth(p);
+}
+
+void x86_cpu_policy_clear_out_of_range_leaves(struct cpu_policy *p)
+{
+ unsigned int i;
+
+ zero_leaves(p->basic.raw, p->basic.max_leaf + 1,
+ ARRAY_SIZE(p->basic.raw) - 1);
+
+ if ( p->basic.max_leaf < 4 )
+ memset(p->cache.raw, 0, sizeof(p->cache.raw));
+ else
+ {
+ for ( i = 0; (i < ARRAY_SIZE(p->cache.raw) &&
+ p->cache.subleaf[i].type); ++i )
+ ;
+
+ zero_leaves(p->cache.raw, i, ARRAY_SIZE(p->cache.raw) - 1);
+ }
+
+ if ( p->basic.max_leaf < 7 )
+ memset(p->feat.raw, 0, sizeof(p->feat.raw));
+ else
+ zero_leaves(p->feat.raw, p->feat.max_subleaf + 1,
+ ARRAY_SIZE(p->feat.raw) - 1);
+
+ if ( p->basic.max_leaf < 0xb )
+ memset(p->topo.raw, 0, sizeof(p->topo.raw));
+ else
+ {
+ for ( i = 0; (i < ARRAY_SIZE(p->topo.raw) &&
+ p->topo.subleaf[i].type); ++i )
+ ;
+
+ zero_leaves(p->topo.raw, i, ARRAY_SIZE(p->topo.raw) - 1);
+ }
+
+ if ( p->basic.max_leaf < 0xd || !cpu_policy_xstates(p) )
+ memset(p->xstate.raw, 0, sizeof(p->xstate.raw));
+ else
+ {
+ /* This logic will probably need adjusting when XCR0[63] gets used. */
+ BUILD_BUG_ON(ARRAY_SIZE(p->xstate.raw) > 63);
+
+ /* First two leaves always valid. Rest depend on xstates. */
+ i = max(2, 64 - __builtin_clzll(cpu_policy_xstates(p)));
+
+ zero_leaves(p->xstate.raw, i,
+ ARRAY_SIZE(p->xstate.raw) - 1);
+ }
+
+ zero_leaves(p->extd.raw, (p->extd.max_leaf & 0xffff) + 1,
+ ARRAY_SIZE(p->extd.raw) - 1);
+}
+
+const uint32_t *x86_cpu_policy_lookup_deep_deps(uint32_t feature)
+{
+ static const uint32_t deep_features[] = INIT_DEEP_FEATURES;
+ static const struct {
+ uint32_t feature;
+ uint32_t fs[FEATURESET_NR_ENTRIES];
+ } deep_deps[] = INIT_DEEP_DEPS;
+ unsigned int start = 0, end = ARRAY_SIZE(deep_deps);
+
+ BUILD_BUG_ON(ARRAY_SIZE(deep_deps) != NR_DEEP_DEPS);
+
+ /* Fast early exit. */
+ if ( !test_bit(feature, deep_features) )
+ return NULL;
+
+ /* deep_deps[] is sorted. Perform a binary search. */
+ while ( start < end )
+ {
+ unsigned int mid = start + ((end - start) / 2);
+
+ if ( deep_deps[mid].feature > feature )
+ end = mid;
+ else if ( deep_deps[mid].feature < feature )
+ start = mid + 1;
+ else
+ return deep_deps[mid].fs;
+ }
+
+ return NULL;
+}
+
+/*
+ * Copy a single cpuid_leaf into a provided xen_cpuid_leaf_t buffer,
+ * performing boundary checking against the buffer size.
+ */
+static int copy_leaf_to_buffer(uint32_t leaf, uint32_t subleaf,
+ const struct cpuid_leaf *data,
+ cpuid_leaf_buffer_t leaves,
+ uint32_t *curr_entry, const uint32_t nr_entries)
+{
+ const xen_cpuid_leaf_t val = {
+ leaf, subleaf, data->a, data->b, data->c, data->d,
+ };
+
+ if ( *curr_entry == nr_entries )
+ return -ENOBUFS;
+
+ if ( copy_to_buffer_offset(leaves, *curr_entry, &val, 1) )
+ return -EFAULT;
+
+ ++*curr_entry;
+
+ return 0;
+}
+
+int x86_cpuid_copy_to_buffer(const struct cpu_policy *p,
+ cpuid_leaf_buffer_t leaves, uint32_t
*nr_entries_p)
+{
+ const uint32_t nr_entries = *nr_entries_p;
+ uint32_t curr_entry = 0, leaf, subleaf;
+
+#define COPY_LEAF(l, s, data) \
+ ({ \
+ int ret; \
+ \
+ if ( (ret = copy_leaf_to_buffer( \
+ l, s, data, leaves, &curr_entry, nr_entries)) ) \
+ return ret; \
+ })
+
+ /* Basic leaves. */
+ for ( leaf = 0; leaf <= MIN(p->basic.max_leaf,
+ ARRAY_SIZE(p->basic.raw) - 1); ++leaf )
+ {
+ switch ( leaf )
+ {
+ case 0x4:
+ for ( subleaf = 0; subleaf < ARRAY_SIZE(p->cache.raw); ++subleaf )
+ {
+ COPY_LEAF(leaf, subleaf, &p->cache.raw[subleaf]);
+
+ if ( p->cache.subleaf[subleaf].type == 0 )
+ break;
+ }
+ break;
+
+ case 0x7:
+ for ( subleaf = 0;
+ subleaf <= MIN(p->feat.max_subleaf,
+ ARRAY_SIZE(p->feat.raw) - 1); ++subleaf )
+ COPY_LEAF(leaf, subleaf, &p->feat.raw[subleaf]);
+ break;
+
+ case 0xb:
+ for ( subleaf = 0; subleaf < ARRAY_SIZE(p->topo.raw); ++subleaf )
+ {
+ COPY_LEAF(leaf, subleaf, &p->topo.raw[subleaf]);
+
+ if ( p->topo.subleaf[subleaf].type == 0 )
+ break;
+ }
+ break;
+
+ case 0xd:
+ {
+ uint64_t xstates = cpu_policy_xstates(p);
+
+ COPY_LEAF(leaf, 0, &p->xstate.raw[0]);
+ COPY_LEAF(leaf, 1, &p->xstate.raw[1]);
+
+ for ( xstates >>= 2, subleaf = 2;
+ xstates && subleaf < ARRAY_SIZE(p->xstate.raw);
+ xstates >>= 1, ++subleaf )
+ COPY_LEAF(leaf, subleaf, &p->xstate.raw[subleaf]);
+ break;
+ }
+
+ default:
+ COPY_LEAF(leaf, XEN_CPUID_NO_SUBLEAF, &p->basic.raw[leaf]);
+ break;
+ }
+ }
+
+ /* TODO: Port Xen and Viridian leaves to the new CPUID infrastructure. */
+ COPY_LEAF(0x40000000, XEN_CPUID_NO_SUBLEAF,
+ &(struct cpuid_leaf){ p->hv_limit });
+ COPY_LEAF(0x40000100, XEN_CPUID_NO_SUBLEAF,
+ &(struct cpuid_leaf){ p->hv2_limit });
+
+ /* Extended leaves. */
+ for ( leaf = 0; leaf <= MIN(p->extd.max_leaf & 0xffffUL,
+ ARRAY_SIZE(p->extd.raw) - 1); ++leaf )
+ COPY_LEAF(0x80000000U | leaf, XEN_CPUID_NO_SUBLEAF,
&p->extd.raw[leaf]);
+
+#undef COPY_LEAF
+
+ *nr_entries_p = curr_entry;
+
+ return 0;
+}
+
+int x86_cpuid_copy_from_buffer(struct cpu_policy *p,
+ const cpuid_leaf_buffer_t leaves,
+ uint32_t nr_entries, uint32_t *err_leaf,
+ uint32_t *err_subleaf)
+{
+ unsigned int i;
+ xen_cpuid_leaf_t data;
+
+ if ( err_leaf )
+ *err_leaf = -1;
+ if ( err_subleaf )
+ *err_subleaf = -1;
+
+ /*
+ * A well formed caller is expected to pass an array with leaves in order,
+ * and without any repetitions. However, due to per-vendor differences,
+ * and in the case of upgrade or levelled scenarios, we typically expect
+ * fewer than MAX leaves to be passed.
+ *
+ * Detecting repeated entries is prohibitively complicated, so we don't
+ * bother. That said, one way or another if more than MAX leaves are
+ * passed, something is wrong.
+ */
+ if ( nr_entries > CPUID_MAX_SERIALISED_LEAVES )
+ return -E2BIG;
+
+ for ( i = 0; i < nr_entries; ++i )
+ {
+ struct cpuid_leaf l;
+
+ if ( copy_from_buffer_offset(&data, leaves, i, 1) )
+ return -EFAULT;
+
+ l = (struct cpuid_leaf){ data.a, data.b, data.c, data.d };
+
+ switch ( data.leaf )
+ {
+ case 0 ... ARRAY_SIZE(p->basic.raw) - 1:
+ switch ( data.leaf )
+ {
+ case 0x4:
+ if ( data.subleaf >= ARRAY_SIZE(p->cache.raw) )
+ goto out_of_range;
+
+ array_access_nospec(p->cache.raw, data.subleaf) = l;
+ break;
+
+ case 0x7:
+ if ( data.subleaf >= ARRAY_SIZE(p->feat.raw) )
+ goto out_of_range;
+
+ array_access_nospec(p->feat.raw, data.subleaf) = l;
+ break;
+
+ case 0xb:
+ if ( data.subleaf >= ARRAY_SIZE(p->topo.raw) )
+ goto out_of_range;
+
+ array_access_nospec(p->topo.raw, data.subleaf) = l;
+ break;
+
+ case 0xd:
+ if ( data.subleaf >= ARRAY_SIZE(p->xstate.raw) )
+ goto out_of_range;
+
+ array_access_nospec(p->xstate.raw, data.subleaf) = l;
+ break;
+
+ default:
+ if ( data.subleaf != XEN_CPUID_NO_SUBLEAF )
+ goto out_of_range;
+
+ array_access_nospec(p->basic.raw, data.leaf) = l;
+ break;
+ }
+ break;
+
+ case 0x40000000:
+ if ( data.subleaf != XEN_CPUID_NO_SUBLEAF )
+ goto out_of_range;
+
+ p->hv_limit = l.a;
+ break;
+
+ case 0x40000100:
+ if ( data.subleaf != XEN_CPUID_NO_SUBLEAF )
+ goto out_of_range;
+
+ p->hv2_limit = l.a;
+ break;
+
+ case 0x80000000U ... 0x80000000U + ARRAY_SIZE(p->extd.raw) - 1:
+ if ( data.subleaf != XEN_CPUID_NO_SUBLEAF )
+ goto out_of_range;
+
+ array_access_nospec(p->extd.raw, data.leaf & 0xffff) = l;
+ break;
+
+ default:
+ goto out_of_range;
+ }
+ }
+
+ x86_cpu_policy_recalc_synth(p);
+
+ return 0;
+
+ out_of_range:
+ if ( err_leaf )
+ *err_leaf = data.leaf;
+ if ( err_subleaf )
+ *err_subleaf = data.subleaf;
+
+ return -ERANGE;
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/arch/x86/lib/cpu-policy/msr.c
b/xen/arch/x86/lib/cpu-policy/msr.c
new file mode 100644
index 0000000000..e04b9ca013
--- /dev/null
+++ b/xen/arch/x86/lib/cpu-policy/msr.c
@@ -0,0 +1,130 @@
+#include "private.h"
+
+#include <xen/lib/x86/cpu-policy.h>
+
+/*
+ * Copy a single MSR into the provided msr_entry_buffer_t buffer, performing a
+ * boundary check against the buffer size.
+ */
+static int copy_msr_to_buffer(uint32_t idx, uint64_t val,
+ msr_entry_buffer_t msrs,
+ uint32_t *curr_entry, const uint32_t nr_entries)
+{
+ const xen_msr_entry_t ent = { .idx = idx, .val = val };
+
+ if ( *curr_entry == nr_entries )
+ return -ENOBUFS;
+
+ if ( copy_to_buffer_offset(msrs, *curr_entry, &ent, 1) )
+ return -EFAULT;
+
+ ++*curr_entry;
+
+ return 0;
+}
+
+int x86_msr_copy_to_buffer(const struct cpu_policy *p,
+ msr_entry_buffer_t msrs, uint32_t *nr_entries_p)
+{
+ const uint32_t nr_entries = *nr_entries_p;
+ uint32_t curr_entry = 0;
+
+#define COPY_MSR(idx, val) \
+ ({ \
+ int ret; \
+ \
+ if ( (ret = copy_msr_to_buffer( \
+ idx, val, msrs, &curr_entry, nr_entries)) ) \
+ return ret; \
+ })
+
+ COPY_MSR(MSR_INTEL_PLATFORM_INFO, p->platform_info.raw);
+ COPY_MSR(MSR_ARCH_CAPABILITIES, p->arch_caps.raw);
+
+#undef COPY_MSR
+
+ *nr_entries_p = curr_entry;
+
+ return 0;
+}
+
+int x86_msr_copy_from_buffer(struct cpu_policy *p,
+ const msr_entry_buffer_t msrs, uint32_t
nr_entries,
+ uint32_t *err_msr)
+{
+ unsigned int i;
+ xen_msr_entry_t data;
+ int rc;
+
+ if ( err_msr )
+ *err_msr = -1;
+
+ /*
+ * A well formed caller is expected to pass an array with entries in
+ * order, and without any repetitions. However, due to per-vendor
+ * differences, and in the case of upgrade or levelled scenarios, we
+ * typically expect fewer than MAX entries to be passed.
+ *
+ * Detecting repeated entries is prohibitively complicated, so we don't
+ * bother. That said, one way or another if more than MAX entries are
+ * passed, something is wrong.
+ */
+ if ( nr_entries > MSR_MAX_SERIALISED_ENTRIES )
+ return -E2BIG;
+
+ for ( i = 0; i < nr_entries; i++ )
+ {
+ if ( copy_from_buffer_offset(&data, msrs, i, 1) )
+ return -EFAULT;
+
+ if ( data.flags ) /* .flags MBZ */
+ {
+ rc = -EINVAL;
+ goto err;
+ }
+
+ switch ( data.idx )
+ {
+ /*
+ * Assign data.val to p->field, checking for truncation if the
+ * backing storage for field is smaller than uint64_t
+ */
+#define ASSIGN(field) \
+({ \
+ if ( (typeof(p->field))data.val != data.val ) \
+ { \
+ rc = -EOVERFLOW; \
+ goto err; \
+ } \
+ p->field = data.val; \
+})
+
+ case MSR_INTEL_PLATFORM_INFO: ASSIGN(platform_info.raw); break;
+ case MSR_ARCH_CAPABILITIES: ASSIGN(arch_caps.raw); break;
+
+#undef ASSIGN
+
+ default:
+ rc = -ERANGE;
+ goto err;
+ }
+ }
+
+ return 0;
+
+ err:
+ if ( err_msr )
+ *err_msr = data.idx;
+
+ return rc;
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/arch/x86/lib/cpu-policy/policy.c
b/xen/arch/x86/lib/cpu-policy/policy.c
new file mode 100644
index 0000000000..f033d22785
--- /dev/null
+++ b/xen/arch/x86/lib/cpu-policy/policy.c
@@ -0,0 +1,54 @@
+#include "private.h"
+
+#include <xen/lib/x86/cpu-policy.h>
+
+int x86_cpu_policies_are_compatible(const struct cpu_policy *host,
+ const struct cpu_policy *guest,
+ struct cpu_policy_errors *err)
+{
+ struct cpu_policy_errors e = INIT_CPU_POLICY_ERRORS;
+ int ret = -EINVAL;
+
+#define NA XEN_CPUID_NO_SUBLEAF
+#define FAIL_CPUID(l, s) \
+ do { e.leaf = (l); e.subleaf = (s); goto out; } while ( 0 )
+#define FAIL_MSR(m) \
+ do { e.msr = (m); goto out; } while ( 0 )
+
+ if ( guest->basic.max_leaf > host->basic.max_leaf )
+ FAIL_CPUID(0, NA);
+
+ if ( guest->feat.max_subleaf > host->feat.max_subleaf )
+ FAIL_CPUID(7, 0);
+
+ if ( guest->extd.max_leaf > host->extd.max_leaf )
+ FAIL_CPUID(0x80000000U, NA);
+
+ /* TODO: Audit more CPUID data. */
+
+ if ( ~host->platform_info.raw & guest->platform_info.raw )
+ FAIL_MSR(MSR_INTEL_PLATFORM_INFO);
+
+#undef FAIL_MSR
+#undef FAIL_CPUID
+#undef NA
+
+ /* Success. */
+ ret = 0;
+
+ out:
+ if ( err )
+ *err = e;
+
+ return ret;
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/arch/x86/lib/cpu-policy/private.h
b/xen/arch/x86/lib/cpu-policy/private.h
new file mode 100644
index 0000000000..aedd8e4821
--- /dev/null
+++ b/xen/arch/x86/lib/cpu-policy/private.h
@@ -0,0 +1,78 @@
+#ifndef XEN_LIB_X86_PRIVATE_H
+#define XEN_LIB_X86_PRIVATE_H
+
+#ifdef __XEN__
+
+#include <xen/bitops.h>
+#include <xen/guest_access.h>
+#include <xen/kernel.h>
+#include <xen/lib.h>
+#include <xen/nospec.h>
+#include <xen/types.h>
+
+#include <asm/msr.h>
+
+#define copy_to_buffer_offset copy_to_guest_offset
+#define copy_from_buffer_offset copy_from_guest_offset
+
+#else
+
+#include <errno.h>
+#include <inttypes.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include <string.h>
+
+#include <xen/asm/msr-index.h>
+#include <xen/asm/x86-vendors.h>
+
+#include <xen-tools/common-macros.h>
+
+static inline bool test_bit(unsigned int bit, const void *vaddr)
+{
+ const char *addr = vaddr;
+
+ return addr[bit / 8] & (1u << (bit % 8));
+}
+
+#define array_access_nospec(a, i) (a)[(i)]
+
+/* memcpy(), but with copy_to_guest_offset()'s API. */
+#define copy_to_buffer_offset(dst, index, src, nr) \
+({ \
+ const typeof(*(src)) *src_ = (src); \
+ typeof(*(dst)) *dst_ = (dst); \
+ typeof(index) index_ = (index); \
+ typeof(nr) nr_ = (nr), i_; \
+ \
+ for ( i_ = 0; i_ < nr_; i_++ ) \
+ dst_[index_ + i_] = src_[i_]; \
+ 0; \
+})
+
+/* memcpy(), but with copy_from_guest_offset()'s API. */
+#define copy_from_buffer_offset(dst, src, index, nr) \
+({ \
+ const typeof(*(src)) *src_ = (src); \
+ typeof(*(dst)) *dst_ = (dst); \
+ typeof(index) index_ = (index); \
+ typeof(nr) nr_ = (nr), i_; \
+ \
+ for ( i_ = 0; i_ < nr_; i_++ ) \
+ dst_[i_] = src_[index_ + i_]; \
+ 0; \
+})
+
+#endif /* __XEN__ */
+
+#endif /* XEN_LIB_X86_PRIVATE_H */
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/lib/Makefile b/xen/lib/Makefile
index 3b0137902c..dcef1610b2 100644
--- a/xen/lib/Makefile
+++ b/xen/lib/Makefile
@@ -1,5 +1,3 @@
-obj-$(CONFIG_X86) += x86/
-
lib-y += bsearch.o
lib-y += ctors.o
lib-y += ctype.o
diff --git a/xen/lib/x86/Makefile b/xen/lib/x86/Makefile
deleted file mode 100644
index 780ea05db1..0000000000
--- a/xen/lib/x86/Makefile
+++ /dev/null
@@ -1,3 +0,0 @@
-obj-y += cpuid.o
-obj-y += msr.o
-obj-y += policy.o
diff --git a/xen/lib/x86/cpuid.c b/xen/lib/x86/cpuid.c
deleted file mode 100644
index 6298d051f2..0000000000
--- a/xen/lib/x86/cpuid.c
+++ /dev/null
@@ -1,559 +0,0 @@
-#include "private.h"
-
-#include <xen/lib/x86/cpu-policy.h>
-
-static void zero_leaves(struct cpuid_leaf *l,
- unsigned int first, unsigned int last)
-{
- if ( first <= last )
- memset(&l[first], 0, sizeof(*l) * (last - first + 1));
-}
-
-unsigned int x86_cpuid_lookup_vendor(uint32_t ebx, uint32_t ecx, uint32_t edx)
-{
- switch ( ebx )
- {
- case X86_VENDOR_INTEL_EBX:
- if ( ecx == X86_VENDOR_INTEL_ECX &&
- edx == X86_VENDOR_INTEL_EDX )
- return X86_VENDOR_INTEL;
- break;
-
- case X86_VENDOR_AMD_EBX:
- if ( ecx == X86_VENDOR_AMD_ECX &&
- edx == X86_VENDOR_AMD_EDX )
- return X86_VENDOR_AMD;
- break;
-
- case X86_VENDOR_CENTAUR_EBX:
- if ( ecx == X86_VENDOR_CENTAUR_ECX &&
- edx == X86_VENDOR_CENTAUR_EDX )
- return X86_VENDOR_CENTAUR;
- break;
-
- case X86_VENDOR_SHANGHAI_EBX:
- if ( ecx == X86_VENDOR_SHANGHAI_ECX &&
- edx == X86_VENDOR_SHANGHAI_EDX )
- return X86_VENDOR_SHANGHAI;
- break;
-
- case X86_VENDOR_HYGON_EBX:
- if ( ecx == X86_VENDOR_HYGON_ECX &&
- edx == X86_VENDOR_HYGON_EDX )
- return X86_VENDOR_HYGON;
- break;
- }
-
- return X86_VENDOR_UNKNOWN;
-}
-
-const char *x86_cpuid_vendor_to_str(unsigned int vendor)
-{
- switch ( vendor )
- {
- case X86_VENDOR_INTEL: return "Intel";
- case X86_VENDOR_AMD: return "AMD";
- case X86_VENDOR_CENTAUR: return "Centaur";
- case X86_VENDOR_SHANGHAI: return "Shanghai";
- case X86_VENDOR_HYGON: return "Hygon";
- default: return "Unknown";
- }
-}
-
-void x86_cpu_policy_to_featureset(
- const struct cpu_policy *p, uint32_t fs[FEATURESET_NR_ENTRIES])
-{
- fs[FEATURESET_1d] = p->basic._1d;
- fs[FEATURESET_1c] = p->basic._1c;
- fs[FEATURESET_e1d] = p->extd.e1d;
- fs[FEATURESET_e1c] = p->extd.e1c;
- fs[FEATURESET_Da1] = p->xstate.Da1;
- fs[FEATURESET_7b0] = p->feat._7b0;
- fs[FEATURESET_7c0] = p->feat._7c0;
- fs[FEATURESET_e7d] = p->extd.e7d;
- fs[FEATURESET_e8b] = p->extd.e8b;
- fs[FEATURESET_7d0] = p->feat._7d0;
- fs[FEATURESET_7a1] = p->feat._7a1;
- fs[FEATURESET_e21a] = p->extd.e21a;
- fs[FEATURESET_7b1] = p->feat._7b1;
- fs[FEATURESET_7d2] = p->feat._7d2;
- fs[FEATURESET_7c1] = p->feat._7c1;
- fs[FEATURESET_7d1] = p->feat._7d1;
- fs[FEATURESET_m10Al] = p->arch_caps.lo;
- fs[FEATURESET_m10Ah] = p->arch_caps.hi;
- fs[FEATURESET_e21c] = p->extd.e21c;
-}
-
-void x86_cpu_featureset_to_policy(
- const uint32_t fs[FEATURESET_NR_ENTRIES], struct cpu_policy *p)
-{
- p->basic._1d = fs[FEATURESET_1d];
- p->basic._1c = fs[FEATURESET_1c];
- p->extd.e1d = fs[FEATURESET_e1d];
- p->extd.e1c = fs[FEATURESET_e1c];
- p->xstate.Da1 = fs[FEATURESET_Da1];
- p->feat._7b0 = fs[FEATURESET_7b0];
- p->feat._7c0 = fs[FEATURESET_7c0];
- p->extd.e7d = fs[FEATURESET_e7d];
- p->extd.e8b = fs[FEATURESET_e8b];
- p->feat._7d0 = fs[FEATURESET_7d0];
- p->feat._7a1 = fs[FEATURESET_7a1];
- p->extd.e21a = fs[FEATURESET_e21a];
- p->feat._7b1 = fs[FEATURESET_7b1];
- p->feat._7d2 = fs[FEATURESET_7d2];
- p->feat._7c1 = fs[FEATURESET_7c1];
- p->feat._7d1 = fs[FEATURESET_7d1];
- p->arch_caps.lo = fs[FEATURESET_m10Al];
- p->arch_caps.hi = fs[FEATURESET_m10Ah];
- p->extd.e21c = fs[FEATURESET_e21c];
-}
-
-void x86_cpu_policy_recalc_synth(struct cpu_policy *p)
-{
- p->x86_vendor = x86_cpuid_lookup_vendor(
- p->basic.vendor_ebx, p->basic.vendor_ecx, p->basic.vendor_edx);
-}
-
-void x86_cpu_policy_fill_native(struct cpu_policy *p)
-{
- unsigned int i;
-
- cpuid_leaf(0, &p->basic.raw[0]);
- for ( i = 1; i <= MIN(p->basic.max_leaf,
- ARRAY_SIZE(p->basic.raw) - 1); ++i )
- {
- switch ( i )
- {
- case 0x4: case 0x7: case 0xb: case 0xd:
- /* Multi-invocation leaves. Deferred. */
- continue;
- }
-
- cpuid_leaf(i, &p->basic.raw[i]);
- }
-
- if ( p->basic.max_leaf >= 4 )
- {
- for ( i = 0; i < ARRAY_SIZE(p->cache.raw); ++i )
- {
- union {
- struct cpuid_leaf l;
- struct cpuid_cache_leaf c;
- } u;
-
- cpuid_count_leaf(4, i, &u.l);
-
- if ( u.c.type == 0 )
- break;
-
- p->cache.subleaf[i] = u.c;
- }
-
- /*
- * The choice of CPUID_GUEST_NR_CACHE is arbitrary. It is expected
- * that it will eventually need increasing for future hardware.
- */
-#ifdef __XEN__
- if ( i == ARRAY_SIZE(p->cache.raw) )
- printk(XENLOG_WARNING
- "CPUID: Insufficient Leaf 4 space for this hardware\n");
-#endif
- }
-
- if ( p->basic.max_leaf >= 7 )
- {
- cpuid_count_leaf(7, 0, &p->feat.raw[0]);
-
- for ( i = 1; i <= MIN(p->feat.max_subleaf,
- ARRAY_SIZE(p->feat.raw) - 1); ++i )
- cpuid_count_leaf(7, i, &p->feat.raw[i]);
- }
-
- if ( p->basic.max_leaf >= 0xb )
- {
- union {
- struct cpuid_leaf l;
- struct cpuid_topo_leaf t;
- } u;
-
- for ( i = 0; i < ARRAY_SIZE(p->topo.raw); ++i )
- {
- cpuid_count_leaf(0xb, i, &u.l);
-
- if ( u.t.type == 0 )
- break;
-
- p->topo.subleaf[i] = u.t;
- }
-
- /*
- * The choice of CPUID_GUEST_NR_TOPO is per the manual. It may need
- * to grow for future hardware.
- */
-#ifdef __XEN__
- if ( i == ARRAY_SIZE(p->topo.raw) &&
- (cpuid_count_leaf(0xb, i, &u.l), u.t.type != 0) )
- printk(XENLOG_WARNING
- "CPUID: Insufficient Leaf 0xb space for this hardware\n");
-#endif
- }
-
- if ( p->basic.max_leaf >= 0xd )
- {
- uint64_t xstates;
-
- cpuid_count_leaf(0xd, 0, &p->xstate.raw[0]);
- cpuid_count_leaf(0xd, 1, &p->xstate.raw[1]);
-
- xstates = cpu_policy_xstates(p);
-
- /* This logic will probably need adjusting when XCR0[63] gets used. */
- BUILD_BUG_ON(ARRAY_SIZE(p->xstate.raw) > 63);
-
- for ( i = 2; i < min_t(unsigned int, 63,
- ARRAY_SIZE(p->xstate.raw)); ++i )
- {
- if ( xstates & (1ULL << i) )
- cpuid_count_leaf(0xd, i, &p->xstate.raw[i]);
- }
- }
-
- /* Extended leaves. */
- cpuid_leaf(0x80000000U, &p->extd.raw[0]);
- for ( i = 1; i <= MIN(p->extd.max_leaf & 0xffffU,
- ARRAY_SIZE(p->extd.raw) - 1); ++i )
- cpuid_leaf(0x80000000U + i, &p->extd.raw[i]);
-
- /* Don't report leaves from possible lower level hypervisor, for now. */
- p->hv_limit = 0;
- p->hv2_limit = 0;
-
-#ifdef __XEN__
- /* TODO MSR_PLATFORM_INFO */
-
- if ( p->feat.arch_caps )
- rdmsrl(MSR_ARCH_CAPABILITIES, p->arch_caps.raw);
-#endif
-
- x86_cpu_policy_recalc_synth(p);
-}
-
-void x86_cpu_policy_clear_out_of_range_leaves(struct cpu_policy *p)
-{
- unsigned int i;
-
- zero_leaves(p->basic.raw, p->basic.max_leaf + 1,
- ARRAY_SIZE(p->basic.raw) - 1);
-
- if ( p->basic.max_leaf < 4 )
- memset(p->cache.raw, 0, sizeof(p->cache.raw));
- else
- {
- for ( i = 0; (i < ARRAY_SIZE(p->cache.raw) &&
- p->cache.subleaf[i].type); ++i )
- ;
-
- zero_leaves(p->cache.raw, i, ARRAY_SIZE(p->cache.raw) - 1);
- }
-
- if ( p->basic.max_leaf < 7 )
- memset(p->feat.raw, 0, sizeof(p->feat.raw));
- else
- zero_leaves(p->feat.raw, p->feat.max_subleaf + 1,
- ARRAY_SIZE(p->feat.raw) - 1);
-
- if ( p->basic.max_leaf < 0xb )
- memset(p->topo.raw, 0, sizeof(p->topo.raw));
- else
- {
- for ( i = 0; (i < ARRAY_SIZE(p->topo.raw) &&
- p->topo.subleaf[i].type); ++i )
- ;
-
- zero_leaves(p->topo.raw, i, ARRAY_SIZE(p->topo.raw) - 1);
- }
-
- if ( p->basic.max_leaf < 0xd || !cpu_policy_xstates(p) )
- memset(p->xstate.raw, 0, sizeof(p->xstate.raw));
- else
- {
- /* This logic will probably need adjusting when XCR0[63] gets used. */
- BUILD_BUG_ON(ARRAY_SIZE(p->xstate.raw) > 63);
-
- /* First two leaves always valid. Rest depend on xstates. */
- i = max(2, 64 - __builtin_clzll(cpu_policy_xstates(p)));
-
- zero_leaves(p->xstate.raw, i,
- ARRAY_SIZE(p->xstate.raw) - 1);
- }
-
- zero_leaves(p->extd.raw, (p->extd.max_leaf & 0xffff) + 1,
- ARRAY_SIZE(p->extd.raw) - 1);
-}
-
-const uint32_t *x86_cpu_policy_lookup_deep_deps(uint32_t feature)
-{
- static const uint32_t deep_features[] = INIT_DEEP_FEATURES;
- static const struct {
- uint32_t feature;
- uint32_t fs[FEATURESET_NR_ENTRIES];
- } deep_deps[] = INIT_DEEP_DEPS;
- unsigned int start = 0, end = ARRAY_SIZE(deep_deps);
-
- BUILD_BUG_ON(ARRAY_SIZE(deep_deps) != NR_DEEP_DEPS);
-
- /* Fast early exit. */
- if ( !test_bit(feature, deep_features) )
- return NULL;
-
- /* deep_deps[] is sorted. Perform a binary search. */
- while ( start < end )
- {
- unsigned int mid = start + ((end - start) / 2);
-
- if ( deep_deps[mid].feature > feature )
- end = mid;
- else if ( deep_deps[mid].feature < feature )
- start = mid + 1;
- else
- return deep_deps[mid].fs;
- }
-
- return NULL;
-}
-
-/*
- * Copy a single cpuid_leaf into a provided xen_cpuid_leaf_t buffer,
- * performing boundary checking against the buffer size.
- */
-static int copy_leaf_to_buffer(uint32_t leaf, uint32_t subleaf,
- const struct cpuid_leaf *data,
- cpuid_leaf_buffer_t leaves,
- uint32_t *curr_entry, const uint32_t nr_entries)
-{
- const xen_cpuid_leaf_t val = {
- leaf, subleaf, data->a, data->b, data->c, data->d,
- };
-
- if ( *curr_entry == nr_entries )
- return -ENOBUFS;
-
- if ( copy_to_buffer_offset(leaves, *curr_entry, &val, 1) )
- return -EFAULT;
-
- ++*curr_entry;
-
- return 0;
-}
-
-int x86_cpuid_copy_to_buffer(const struct cpu_policy *p,
- cpuid_leaf_buffer_t leaves, uint32_t
*nr_entries_p)
-{
- const uint32_t nr_entries = *nr_entries_p;
- uint32_t curr_entry = 0, leaf, subleaf;
-
-#define COPY_LEAF(l, s, data) \
- ({ \
- int ret; \
- \
- if ( (ret = copy_leaf_to_buffer( \
- l, s, data, leaves, &curr_entry, nr_entries)) ) \
- return ret; \
- })
-
- /* Basic leaves. */
- for ( leaf = 0; leaf <= MIN(p->basic.max_leaf,
- ARRAY_SIZE(p->basic.raw) - 1); ++leaf )
- {
- switch ( leaf )
- {
- case 0x4:
- for ( subleaf = 0; subleaf < ARRAY_SIZE(p->cache.raw); ++subleaf )
- {
- COPY_LEAF(leaf, subleaf, &p->cache.raw[subleaf]);
-
- if ( p->cache.subleaf[subleaf].type == 0 )
- break;
- }
- break;
-
- case 0x7:
- for ( subleaf = 0;
- subleaf <= MIN(p->feat.max_subleaf,
- ARRAY_SIZE(p->feat.raw) - 1); ++subleaf )
- COPY_LEAF(leaf, subleaf, &p->feat.raw[subleaf]);
- break;
-
- case 0xb:
- for ( subleaf = 0; subleaf < ARRAY_SIZE(p->topo.raw); ++subleaf )
- {
- COPY_LEAF(leaf, subleaf, &p->topo.raw[subleaf]);
-
- if ( p->topo.subleaf[subleaf].type == 0 )
- break;
- }
- break;
-
- case 0xd:
- {
- uint64_t xstates = cpu_policy_xstates(p);
-
- COPY_LEAF(leaf, 0, &p->xstate.raw[0]);
- COPY_LEAF(leaf, 1, &p->xstate.raw[1]);
-
- for ( xstates >>= 2, subleaf = 2;
- xstates && subleaf < ARRAY_SIZE(p->xstate.raw);
- xstates >>= 1, ++subleaf )
- COPY_LEAF(leaf, subleaf, &p->xstate.raw[subleaf]);
- break;
- }
-
- default:
- COPY_LEAF(leaf, XEN_CPUID_NO_SUBLEAF, &p->basic.raw[leaf]);
- break;
- }
- }
-
- /* TODO: Port Xen and Viridian leaves to the new CPUID infrastructure. */
- COPY_LEAF(0x40000000, XEN_CPUID_NO_SUBLEAF,
- &(struct cpuid_leaf){ p->hv_limit });
- COPY_LEAF(0x40000100, XEN_CPUID_NO_SUBLEAF,
- &(struct cpuid_leaf){ p->hv2_limit });
-
- /* Extended leaves. */
- for ( leaf = 0; leaf <= MIN(p->extd.max_leaf & 0xffffUL,
- ARRAY_SIZE(p->extd.raw) - 1); ++leaf )
- COPY_LEAF(0x80000000U | leaf, XEN_CPUID_NO_SUBLEAF,
&p->extd.raw[leaf]);
-
-#undef COPY_LEAF
-
- *nr_entries_p = curr_entry;
-
- return 0;
-}
-
-int x86_cpuid_copy_from_buffer(struct cpu_policy *p,
- const cpuid_leaf_buffer_t leaves,
- uint32_t nr_entries, uint32_t *err_leaf,
- uint32_t *err_subleaf)
-{
- unsigned int i;
- xen_cpuid_leaf_t data;
-
- if ( err_leaf )
- *err_leaf = -1;
- if ( err_subleaf )
- *err_subleaf = -1;
-
- /*
- * A well formed caller is expected to pass an array with leaves in order,
- * and without any repetitions. However, due to per-vendor differences,
- * and in the case of upgrade or levelled scenarios, we typically expect
- * fewer than MAX leaves to be passed.
- *
- * Detecting repeated entries is prohibitively complicated, so we don't
- * bother. That said, one way or another if more than MAX leaves are
- * passed, something is wrong.
- */
- if ( nr_entries > CPUID_MAX_SERIALISED_LEAVES )
- return -E2BIG;
-
- for ( i = 0; i < nr_entries; ++i )
- {
- struct cpuid_leaf l;
-
- if ( copy_from_buffer_offset(&data, leaves, i, 1) )
- return -EFAULT;
-
- l = (struct cpuid_leaf){ data.a, data.b, data.c, data.d };
-
- switch ( data.leaf )
- {
- case 0 ... ARRAY_SIZE(p->basic.raw) - 1:
- switch ( data.leaf )
- {
- case 0x4:
- if ( data.subleaf >= ARRAY_SIZE(p->cache.raw) )
- goto out_of_range;
-
- array_access_nospec(p->cache.raw, data.subleaf) = l;
- break;
-
- case 0x7:
- if ( data.subleaf >= ARRAY_SIZE(p->feat.raw) )
- goto out_of_range;
-
- array_access_nospec(p->feat.raw, data.subleaf) = l;
- break;
-
- case 0xb:
- if ( data.subleaf >= ARRAY_SIZE(p->topo.raw) )
- goto out_of_range;
-
- array_access_nospec(p->topo.raw, data.subleaf) = l;
- break;
-
- case 0xd:
- if ( data.subleaf >= ARRAY_SIZE(p->xstate.raw) )
- goto out_of_range;
-
- array_access_nospec(p->xstate.raw, data.subleaf) = l;
- break;
-
- default:
- if ( data.subleaf != XEN_CPUID_NO_SUBLEAF )
- goto out_of_range;
-
- array_access_nospec(p->basic.raw, data.leaf) = l;
- break;
- }
- break;
-
- case 0x40000000:
- if ( data.subleaf != XEN_CPUID_NO_SUBLEAF )
- goto out_of_range;
-
- p->hv_limit = l.a;
- break;
-
- case 0x40000100:
- if ( data.subleaf != XEN_CPUID_NO_SUBLEAF )
- goto out_of_range;
-
- p->hv2_limit = l.a;
- break;
-
- case 0x80000000U ... 0x80000000U + ARRAY_SIZE(p->extd.raw) - 1:
- if ( data.subleaf != XEN_CPUID_NO_SUBLEAF )
- goto out_of_range;
-
- array_access_nospec(p->extd.raw, data.leaf & 0xffff) = l;
- break;
-
- default:
- goto out_of_range;
- }
- }
-
- x86_cpu_policy_recalc_synth(p);
-
- return 0;
-
- out_of_range:
- if ( err_leaf )
- *err_leaf = data.leaf;
- if ( err_subleaf )
- *err_subleaf = data.subleaf;
-
- return -ERANGE;
-}
-
-/*
- * Local variables:
- * mode: C
- * c-file-style: "BSD"
- * c-basic-offset: 4
- * tab-width: 4
- * indent-tabs-mode: nil
- * End:
- */
diff --git a/xen/lib/x86/msr.c b/xen/lib/x86/msr.c
deleted file mode 100644
index e04b9ca013..0000000000
--- a/xen/lib/x86/msr.c
+++ /dev/null
@@ -1,130 +0,0 @@
-#include "private.h"
-
-#include <xen/lib/x86/cpu-policy.h>
-
-/*
- * Copy a single MSR into the provided msr_entry_buffer_t buffer, performing a
- * boundary check against the buffer size.
- */
-static int copy_msr_to_buffer(uint32_t idx, uint64_t val,
- msr_entry_buffer_t msrs,
- uint32_t *curr_entry, const uint32_t nr_entries)
-{
- const xen_msr_entry_t ent = { .idx = idx, .val = val };
-
- if ( *curr_entry == nr_entries )
- return -ENOBUFS;
-
- if ( copy_to_buffer_offset(msrs, *curr_entry, &ent, 1) )
- return -EFAULT;
-
- ++*curr_entry;
-
- return 0;
-}
-
-int x86_msr_copy_to_buffer(const struct cpu_policy *p,
- msr_entry_buffer_t msrs, uint32_t *nr_entries_p)
-{
- const uint32_t nr_entries = *nr_entries_p;
- uint32_t curr_entry = 0;
-
-#define COPY_MSR(idx, val) \
- ({ \
- int ret; \
- \
- if ( (ret = copy_msr_to_buffer( \
- idx, val, msrs, &curr_entry, nr_entries)) ) \
- return ret; \
- })
-
- COPY_MSR(MSR_INTEL_PLATFORM_INFO, p->platform_info.raw);
- COPY_MSR(MSR_ARCH_CAPABILITIES, p->arch_caps.raw);
-
-#undef COPY_MSR
-
- *nr_entries_p = curr_entry;
-
- return 0;
-}
-
-int x86_msr_copy_from_buffer(struct cpu_policy *p,
- const msr_entry_buffer_t msrs, uint32_t
nr_entries,
- uint32_t *err_msr)
-{
- unsigned int i;
- xen_msr_entry_t data;
- int rc;
-
- if ( err_msr )
- *err_msr = -1;
-
- /*
- * A well formed caller is expected to pass an array with entries in
- * order, and without any repetitions. However, due to per-vendor
- * differences, and in the case of upgrade or levelled scenarios, we
- * typically expect fewer than MAX entries to be passed.
- *
- * Detecting repeated entries is prohibitively complicated, so we don't
- * bother. That said, one way or another if more than MAX entries are
- * passed, something is wrong.
- */
- if ( nr_entries > MSR_MAX_SERIALISED_ENTRIES )
- return -E2BIG;
-
- for ( i = 0; i < nr_entries; i++ )
- {
- if ( copy_from_buffer_offset(&data, msrs, i, 1) )
- return -EFAULT;
-
- if ( data.flags ) /* .flags MBZ */
- {
- rc = -EINVAL;
- goto err;
- }
-
- switch ( data.idx )
- {
- /*
- * Assign data.val to p->field, checking for truncation if the
- * backing storage for field is smaller than uint64_t
- */
-#define ASSIGN(field) \
-({ \
- if ( (typeof(p->field))data.val != data.val ) \
- { \
- rc = -EOVERFLOW; \
- goto err; \
- } \
- p->field = data.val; \
-})
-
- case MSR_INTEL_PLATFORM_INFO: ASSIGN(platform_info.raw); break;
- case MSR_ARCH_CAPABILITIES: ASSIGN(arch_caps.raw); break;
-
-#undef ASSIGN
-
- default:
- rc = -ERANGE;
- goto err;
- }
- }
-
- return 0;
-
- err:
- if ( err_msr )
- *err_msr = data.idx;
-
- return rc;
-}
-
-/*
- * Local variables:
- * mode: C
- * c-file-style: "BSD"
- * c-basic-offset: 4
- * tab-width: 4
- * indent-tabs-mode: nil
- * End:
- */
diff --git a/xen/lib/x86/policy.c b/xen/lib/x86/policy.c
deleted file mode 100644
index f033d22785..0000000000
--- a/xen/lib/x86/policy.c
+++ /dev/null
@@ -1,54 +0,0 @@
-#include "private.h"
-
-#include <xen/lib/x86/cpu-policy.h>
-
-int x86_cpu_policies_are_compatible(const struct cpu_policy *host,
- const struct cpu_policy *guest,
- struct cpu_policy_errors *err)
-{
- struct cpu_policy_errors e = INIT_CPU_POLICY_ERRORS;
- int ret = -EINVAL;
-
-#define NA XEN_CPUID_NO_SUBLEAF
-#define FAIL_CPUID(l, s) \
- do { e.leaf = (l); e.subleaf = (s); goto out; } while ( 0 )
-#define FAIL_MSR(m) \
- do { e.msr = (m); goto out; } while ( 0 )
-
- if ( guest->basic.max_leaf > host->basic.max_leaf )
- FAIL_CPUID(0, NA);
-
- if ( guest->feat.max_subleaf > host->feat.max_subleaf )
- FAIL_CPUID(7, 0);
-
- if ( guest->extd.max_leaf > host->extd.max_leaf )
- FAIL_CPUID(0x80000000U, NA);
-
- /* TODO: Audit more CPUID data. */
-
- if ( ~host->platform_info.raw & guest->platform_info.raw )
- FAIL_MSR(MSR_INTEL_PLATFORM_INFO);
-
-#undef FAIL_MSR
-#undef FAIL_CPUID
-#undef NA
-
- /* Success. */
- ret = 0;
-
- out:
- if ( err )
- *err = e;
-
- return ret;
-}
-
-/*
- * Local variables:
- * mode: C
- * c-file-style: "BSD"
- * c-basic-offset: 4
- * tab-width: 4
- * indent-tabs-mode: nil
- * End:
- */
diff --git a/xen/lib/x86/private.h b/xen/lib/x86/private.h
deleted file mode 100644
index aedd8e4821..0000000000
--- a/xen/lib/x86/private.h
+++ /dev/null
@@ -1,78 +0,0 @@
-#ifndef XEN_LIB_X86_PRIVATE_H
-#define XEN_LIB_X86_PRIVATE_H
-
-#ifdef __XEN__
-
-#include <xen/bitops.h>
-#include <xen/guest_access.h>
-#include <xen/kernel.h>
-#include <xen/lib.h>
-#include <xen/nospec.h>
-#include <xen/types.h>
-
-#include <asm/msr.h>
-
-#define copy_to_buffer_offset copy_to_guest_offset
-#define copy_from_buffer_offset copy_from_guest_offset
-
-#else
-
-#include <errno.h>
-#include <inttypes.h>
-#include <stdbool.h>
-#include <stddef.h>
-#include <string.h>
-
-#include <xen/asm/msr-index.h>
-#include <xen/asm/x86-vendors.h>
-
-#include <xen-tools/common-macros.h>
-
-static inline bool test_bit(unsigned int bit, const void *vaddr)
-{
- const char *addr = vaddr;
-
- return addr[bit / 8] & (1u << (bit % 8));
-}
-
-#define array_access_nospec(a, i) (a)[(i)]
-
-/* memcpy(), but with copy_to_guest_offset()'s API. */
-#define copy_to_buffer_offset(dst, index, src, nr) \
-({ \
- const typeof(*(src)) *src_ = (src); \
- typeof(*(dst)) *dst_ = (dst); \
- typeof(index) index_ = (index); \
- typeof(nr) nr_ = (nr), i_; \
- \
- for ( i_ = 0; i_ < nr_; i_++ ) \
- dst_[index_ + i_] = src_[i_]; \
- 0; \
-})
-
-/* memcpy(), but with copy_from_guest_offset()'s API. */
-#define copy_from_buffer_offset(dst, src, index, nr) \
-({ \
- const typeof(*(src)) *src_ = (src); \
- typeof(*(dst)) *dst_ = (dst); \
- typeof(index) index_ = (index); \
- typeof(nr) nr_ = (nr), i_; \
- \
- for ( i_ = 0; i_ < nr_; i_++ ) \
- dst_[i_] = src_[index_ + i_]; \
- 0; \
-})
-
-#endif /* __XEN__ */
-
-#endif /* XEN_LIB_X86_PRIVATE_H */
-
-/*
- * Local variables:
- * mode: C
- * c-file-style: "BSD"
- * c-basic-offset: 4
- * tab-width: 4
- * indent-tabs-mode: nil
- * End:
- */
--
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