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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 6/8] viridian: add implementation of synthetic interrupt MSRs
This patch introduces an implementation of the SCONTROL, SVERSION, SIEFP,
SIMP, EOM and SINT0-15 SynIC MSRs. No message source is added and, as such,
nothing will yet generate a synthetic interrupt. A subsequent patch will
add an implementation of synthetic timers which will need the infrastructure
added by this patch to deliver expiry messages to the guest.
NOTE: A 'synic' option is added to the toolstack viridian enlightenments
enumeration but is deliberately not documented as enabling these
SynIC registers without a message source is only useful for
debugging.
Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
---
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Cc: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Julien Grall <julien.grall@xxxxxxx>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Cc: Tim Deegan <tim@xxxxxxx>
Cc: "Roger Pau Monné" <roger.pau@xxxxxxxxxx>
---
tools/libxl/libxl.h | 6 +
tools/libxl/libxl_dom.c | 3 +
tools/libxl/libxl_types.idl | 1 +
xen/arch/x86/hvm/viridian/synic.c | 215 +++++++++++++++++++++++++
xen/arch/x86/hvm/viridian/viridian.c | 16 ++
xen/arch/x86/hvm/vlapic.c | 16 +-
xen/include/asm-x86/hvm/hvm.h | 3 +
xen/include/asm-x86/hvm/viridian.h | 24 +++
xen/include/public/arch-x86/hvm/save.h | 2 +
xen/include/public/hvm/params.h | 7 +-
10 files changed, 291 insertions(+), 2 deletions(-)
diff --git a/tools/libxl/libxl.h b/tools/libxl/libxl.h
index a38e5cdba2..a923a380d3 100644
--- a/tools/libxl/libxl.h
+++ b/tools/libxl/libxl.h
@@ -318,6 +318,12 @@
*/
#define LIBXL_HAVE_VIRIDIAN_CRASH_CTL 1
+/*
+ * LIBXL_HAVE_VIRIDIAN_SYNIC indicates that the 'synic' value
+ * is present in the viridian enlightenment enumeration.
+ */
+#define LIBXL_HAVE_VIRIDIAN_SYNIC 1
+
/*
* LIBXL_HAVE_BUILDINFO_HVM_ACPI_LAPTOP_SLATE indicates that
* libxl_domain_build_info has the u.hvm.acpi_laptop_slate field.
diff --git a/tools/libxl/libxl_dom.c b/tools/libxl/libxl_dom.c
index 6160991af3..fb758d2ac3 100644
--- a/tools/libxl/libxl_dom.c
+++ b/tools/libxl/libxl_dom.c
@@ -317,6 +317,9 @@ static int hvm_set_viridian_features(libxl__gc *gc,
uint32_t domid,
if (libxl_bitmap_test(&enlightenments,
LIBXL_VIRIDIAN_ENLIGHTENMENT_CRASH_CTL))
mask |= HVMPV_crash_ctl;
+ if (libxl_bitmap_test(&enlightenments, LIBXL_VIRIDIAN_ENLIGHTENMENT_SYNIC))
+ mask |= HVMPV_synic;
+
if (mask != 0 &&
xc_hvm_param_set(CTX->xch,
domid,
diff --git a/tools/libxl/libxl_types.idl b/tools/libxl/libxl_types.idl
index 51cf06a3a2..ee5eed2945 100644
--- a/tools/libxl/libxl_types.idl
+++ b/tools/libxl/libxl_types.idl
@@ -228,6 +228,7 @@ libxl_viridian_enlightenment =
Enumeration("viridian_enlightenment", [
(4, "hcall_remote_tlb_flush"),
(5, "apic_assist"),
(6, "crash_ctl"),
+ (7, "synic"),
])
libxl_hdtype = Enumeration("hdtype", [
diff --git a/xen/arch/x86/hvm/viridian/synic.c
b/xen/arch/x86/hvm/viridian/synic.c
index 35bd2125fc..8a819c8161 100644
--- a/xen/arch/x86/hvm/viridian/synic.c
+++ b/xen/arch/x86/hvm/viridian/synic.c
@@ -8,11 +8,13 @@
#include <xen/domain_page.h>
#include <xen/hypercall.h>
+#include <xen/nospec.h>
#include <xen/sched.h>
#include <xen/version.h>
#include <asm/apic.h>
#include <asm/hvm/support.h>
+#include <asm/hvm/vlapic.h>
#include "private.h"
@@ -28,6 +30,32 @@ typedef union _HV_VP_ASSIST_PAGE
uint8_t ReservedZBytePadding[PAGE_SIZE];
} HV_VP_ASSIST_PAGE;
+typedef enum HV_MESSAGE_TYPE {
+ HvMessageTypeNone,
+ HvMessageTimerExpired = 0x80000010,
+} HV_MESSAGE_TYPE;
+
+typedef struct HV_MESSAGE_FLAGS {
+ uint8_t MessagePending:1;
+ uint8_t Reserved:7;
+} HV_MESSAGE_FLAGS;
+
+typedef struct HV_MESSAGE_HEADER {
+ HV_MESSAGE_TYPE MessageType;
+ uint16_t Reserved1;
+ HV_MESSAGE_FLAGS MessageFlags;
+ uint8_t PayloadSize;
+ uint64_t Reserved2;
+} HV_MESSAGE_HEADER;
+
+#define HV_MESSAGE_SIZE 256
+#define HV_MESSAGE_MAX_PAYLOAD_QWORD_COUNT 30
+
+typedef struct HV_MESSAGE {
+ HV_MESSAGE_HEADER Header;
+ uint64_t Payload[HV_MESSAGE_MAX_PAYLOAD_QWORD_COUNT];
+} HV_MESSAGE;
+
void viridian_apic_assist_set(struct vcpu *v)
{
HV_VP_ASSIST_PAGE *ptr = v->arch.hvm.viridian->vp_assist.ptr;
@@ -105,6 +133,73 @@ int viridian_synic_wrmsr(struct vcpu *v, uint32_t idx,
uint64_t val)
viridian_map_guest_page(d, &v->arch.hvm.viridian->vp_assist);
break;
+ case HV_X64_MSR_SCONTROL:
+ if ( !(viridian_feature_mask(d) & HVMPV_synic) )
+ return X86EMUL_EXCEPTION;
+
+ v->arch.hvm.viridian->scontrol = val;
+ break;
+
+ case HV_X64_MSR_SVERSION:
+ return X86EMUL_EXCEPTION;
+
+ case HV_X64_MSR_SIEFP:
+ if ( !(viridian_feature_mask(d) & HVMPV_synic) )
+ return X86EMUL_EXCEPTION;
+
+ v->arch.hvm.viridian->siefp = val;
+ break;
+
+ case HV_X64_MSR_SIMP:
+ if ( !(viridian_feature_mask(d) & HVMPV_synic) )
+ return X86EMUL_EXCEPTION;
+
+ viridian_unmap_guest_page(&v->arch.hvm.viridian->simp);
+ v->arch.hvm.viridian->simp.msr.raw = val;
+ viridian_dump_guest_page(v, "SIMP", &v->arch.hvm.viridian->simp);
+ if ( v->arch.hvm.viridian->simp.msr.fields.enabled )
+ viridian_map_guest_page(d, &v->arch.hvm.viridian->simp);
+ break;
+
+ case HV_X64_MSR_EOM:
+ {
+ if ( !(viridian_feature_mask(d) & HVMPV_synic) )
+ return X86EMUL_EXCEPTION;
+
+ v->arch.hvm.viridian->msg_pending = 0;
+ break;
+ }
+ case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
+ {
+ unsigned int sintx = idx - HV_X64_MSR_SINT0;
+ uint8_t vector = v->arch.hvm.viridian->sint[sintx].fields.vector;
+
+ if ( !(viridian_feature_mask(d) & HVMPV_synic) )
+ return X86EMUL_EXCEPTION;
+
+ /*
+ * Invalidate any previous mapping by setting an out-of-range
+ * index.
+ */
+ v->arch.hvm.viridian->vector_to_sintx[vector] =
+ ARRAY_SIZE(v->arch.hvm.viridian->sint);
+
+ v->arch.hvm.viridian->sint[sintx].raw = val;
+
+ /* Vectors must be in the range 16-255 inclusive */
+ vector = v->arch.hvm.viridian->sint[sintx].fields.vector;
+ if ( vector < 16 )
+ return X86EMUL_EXCEPTION;
+
+ printk(XENLOG_G_INFO "%pv: VIRIDIAN SINT%u: vector: %x\n", v, sintx,
+ vector);
+ v->arch.hvm.viridian->vector_to_sintx[vector] = sintx;
+
+ if ( v->arch.hvm.viridian->sint[sintx].fields.polling )
+ clear_bit(sintx, &v->arch.hvm.viridian->msg_pending);
+
+ break;
+ }
default:
gdprintk(XENLOG_INFO, "%s: unimplemented MSR %#x (%016"PRIx64")\n",
__func__, idx, val);
@@ -116,6 +211,8 @@ int viridian_synic_wrmsr(struct vcpu *v, uint32_t idx,
uint64_t val)
int viridian_synic_rdmsr(const struct vcpu *v, uint32_t idx, uint64_t *val)
{
+ struct domain *d = v->domain;
+
switch ( idx )
{
case HV_X64_MSR_EOI:
@@ -137,6 +234,58 @@ int viridian_synic_rdmsr(const struct vcpu *v, uint32_t
idx, uint64_t *val)
*val = v->arch.hvm.viridian->vp_assist.msr.raw;
break;
+ case HV_X64_MSR_SCONTROL:
+ if ( !(viridian_feature_mask(d) & HVMPV_synic) )
+ return X86EMUL_EXCEPTION;
+
+ *val = v->arch.hvm.viridian->scontrol;
+ break;
+
+ case HV_X64_MSR_SVERSION:
+ if ( !(viridian_feature_mask(d) & HVMPV_synic) )
+ return X86EMUL_EXCEPTION;
+
+ /*
+ * The specification says that the version number is 0x00000001
+ * and should be in the lower 32-bits of the MSR, while the
+ * upper 32-bits are reserved... but it doesn't say what they
+ * should be set to. Assume everything but the bottom bit
+ * should be zero.
+ */
+ *val = 1ul;
+ break;
+
+ case HV_X64_MSR_SIEFP:
+ if ( !(viridian_feature_mask(d) & HVMPV_synic) )
+ return X86EMUL_EXCEPTION;
+
+ *val = v->arch.hvm.viridian->siefp;
+ break;
+
+ case HV_X64_MSR_SIMP:
+ if ( !(viridian_feature_mask(d) & HVMPV_synic) )
+ return X86EMUL_EXCEPTION;
+
+ *val = v->arch.hvm.viridian->simp.msr.raw;
+ break;
+
+ case HV_X64_MSR_EOM:
+ if ( !(viridian_feature_mask(d) & HVMPV_synic) )
+ return X86EMUL_EXCEPTION;
+
+ *val = 0;
+ break;
+
+ case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
+ {
+ unsigned int sintx = idx - HV_X64_MSR_SINT0;
+
+ if ( !(viridian_feature_mask(d) & HVMPV_synic) )
+ return X86EMUL_EXCEPTION;
+
+ *val = v->arch.hvm.viridian->sint[sintx].raw;
+ break;
+ }
default:
gdprintk(XENLOG_INFO, "%s: unimplemented MSR %#x\n", __func__, idx);
return X86EMUL_EXCEPTION;
@@ -147,6 +296,20 @@ int viridian_synic_rdmsr(const struct vcpu *v, uint32_t
idx, uint64_t *val)
int viridian_synic_vcpu_init(struct vcpu *v)
{
+ unsigned int i;
+
+ /*
+ * The specification says that all synthetic interrupts must be
+ * initally masked.
+ */
+ for ( i = 0; i < ARRAY_SIZE(v->arch.hvm.viridian->sint); i++ )
+ v->arch.hvm.viridian->sint[i].fields.mask = 1;
+
+ /* Initialize the mapping array with invalid values */
+ for ( i = 0; i < ARRAY_SIZE(v->arch.hvm.viridian->vector_to_sintx); i++ )
+ v->arch.hvm.viridian->vector_to_sintx[i] =
+ ARRAY_SIZE(v->arch.hvm.viridian->sint);
+
return 0;
}
@@ -158,15 +321,49 @@ int viridian_synic_domain_init(struct domain *d)
void viridian_synic_vcpu_deinit(struct vcpu *v)
{
viridian_unmap_guest_page(&v->arch.hvm.viridian->vp_assist);
+ viridian_unmap_guest_page(&v->arch.hvm.viridian->simp);
}
void viridian_synic_domain_deinit(struct domain *d)
{
}
+void viridian_synic_poll_messages(struct vcpu *v)
+{
+ /* There are currently no message sources */
+}
+
+bool viridian_synic_is_auto_eoi_sint(struct vcpu *v, uint8_t vector)
+{
+ int sintx = v->arch.hvm.viridian->vector_to_sintx[vector];
+
+ if ( sintx >= ARRAY_SIZE(v->arch.hvm.viridian->sint) )
+ return false;
+
+ return v->arch.hvm.viridian->sint[sintx].fields.auto_eoi;
+}
+
+void viridian_synic_ack_sint(struct vcpu *v, uint8_t vector)
+{
+ int sintx = v->arch.hvm.viridian->vector_to_sintx[vector];
+
+ if ( sintx < ARRAY_SIZE(v->arch.hvm.viridian->sint) )
+ clear_bit(sintx, &v->arch.hvm.viridian->msg_pending);
+}
+
void viridian_synic_save_vcpu_ctxt(const struct vcpu *v,
struct hvm_viridian_vcpu_context *ctxt)
{
+ unsigned int i;
+
+ BUILD_BUG_ON(ARRAY_SIZE(v->arch.hvm.viridian->sint) !=
+ ARRAY_SIZE(ctxt->sint_msr));
+
+ for ( i = 0; i < ARRAY_SIZE(v->arch.hvm.viridian->sint); i++ )
+ ctxt->sint_msr[i] = v->arch.hvm.viridian->sint[i].raw;
+
+ ctxt->simp_msr = v->arch.hvm.viridian->simp.msr.raw;
+
ctxt->apic_assist_pending = v->arch.hvm.viridian->apic_assist_pending;
ctxt->vp_assist_msr = v->arch.hvm.viridian->vp_assist.msr.raw;
}
@@ -175,12 +372,30 @@ void viridian_synic_load_vcpu_ctxt(
struct vcpu *v, const struct hvm_viridian_vcpu_context *ctxt)
{
struct domain *d = v->domain;
+ unsigned int i;
v->arch.hvm.viridian->vp_assist.msr.raw = ctxt->vp_assist_msr;
if ( v->arch.hvm.viridian->vp_assist.msr.fields.enabled )
viridian_map_guest_page(d, &v->arch.hvm.viridian->vp_assist);
v->arch.hvm.viridian->apic_assist_pending = ctxt->apic_assist_pending;
+
+ v->arch.hvm.viridian->simp.msr.raw = ctxt->simp_msr;
+ if ( v->arch.hvm.viridian->simp.msr.fields.enabled )
+ viridian_map_guest_page(d, &v->arch.hvm.viridian->simp);
+
+ for ( i = 0; i < ARRAY_SIZE(v->arch.hvm.viridian->sint); i++ )
+ {
+ uint8_t vector;
+
+ v->arch.hvm.viridian->sint[i].raw = ctxt->sint_msr[i];
+
+ vector = v->arch.hvm.viridian->sint[i].fields.vector;
+ if ( vector < 16 )
+ continue;
+
+ v->arch.hvm.viridian->vector_to_sintx[vector] = i;
+ }
}
void viridian_synic_save_domain_ctxt(
diff --git a/xen/arch/x86/hvm/viridian/viridian.c
b/xen/arch/x86/hvm/viridian/viridian.c
index 9da87379b7..dc53724468 100644
--- a/xen/arch/x86/hvm/viridian/viridian.c
+++ b/xen/arch/x86/hvm/viridian/viridian.c
@@ -177,6 +177,8 @@ void cpuid_viridian_leaves(const struct vcpu *v, uint32_t
leaf,
mask.AccessPartitionReferenceCounter = 1;
if ( viridian_feature_mask(d) & HVMPV_reference_tsc )
mask.AccessPartitionReferenceTsc = 1;
+ if ( viridian_feature_mask(d) & HVMPV_synic )
+ mask.AccessSynicRegs = 1;
u.mask = mask;
@@ -306,8 +308,16 @@ int guest_wrmsr_viridian(struct vcpu *v, uint32_t idx,
uint64_t val)
case HV_X64_MSR_ICR:
case HV_X64_MSR_TPR:
case HV_X64_MSR_VP_ASSIST_PAGE:
+ case HV_X64_MSR_SCONTROL:
+ case HV_X64_MSR_SVERSION:
+ case HV_X64_MSR_SIEFP:
+ case HV_X64_MSR_SIMP:
+ case HV_X64_MSR_EOM:
+ case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
return viridian_synic_wrmsr(v, idx, val);
+ case HV_X64_MSR_TSC_FREQUENCY:
+ case HV_X64_MSR_APIC_FREQUENCY:
case HV_X64_MSR_REFERENCE_TSC:
return viridian_time_wrmsr(v, idx, val);
@@ -379,6 +389,12 @@ int guest_rdmsr_viridian(const struct vcpu *v, uint32_t
idx, uint64_t *val)
case HV_X64_MSR_ICR:
case HV_X64_MSR_TPR:
case HV_X64_MSR_VP_ASSIST_PAGE:
+ case HV_X64_MSR_SCONTROL:
+ case HV_X64_MSR_SVERSION:
+ case HV_X64_MSR_SIEFP:
+ case HV_X64_MSR_SIMP:
+ case HV_X64_MSR_EOM:
+ case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
return viridian_synic_rdmsr(v, idx, val);
case HV_X64_MSR_TSC_FREQUENCY:
diff --git a/xen/arch/x86/hvm/vlapic.c b/xen/arch/x86/hvm/vlapic.c
index a1a43cd792..45d6ef91da 100644
--- a/xen/arch/x86/hvm/vlapic.c
+++ b/xen/arch/x86/hvm/vlapic.c
@@ -461,11 +461,15 @@ void vlapic_EOI_set(struct vlapic *vlapic)
void vlapic_handle_EOI(struct vlapic *vlapic, u8 vector)
{
+ struct vcpu *v = vlapic_vcpu(vlapic);
struct domain *d = vlapic_domain(vlapic);
if ( vlapic_test_vector(vector, &vlapic->regs->data[APIC_TMR]) )
vioapic_update_EOI(d, vector);
+ if ( has_viridian_synic(v->domain) )
+ viridian_synic_ack_sint(v, vector);
+
hvm_dpci_msi_eoi(d, vector);
}
@@ -1301,6 +1305,13 @@ int vlapic_has_pending_irq(struct vcpu *v)
if ( !vlapic_enabled(vlapic) )
return -1;
+ /*
+ * Poll the viridian message queues before checking the IRR since
+ * a sythetic interrupt may be asserted during the poll.
+ */
+ if ( has_viridian_synic(v->domain) )
+ viridian_synic_poll_messages(v);
+
irr = vlapic_find_highest_irr(vlapic);
if ( irr == -1 )
return -1;
@@ -1360,7 +1371,10 @@ int vlapic_ack_pending_irq(struct vcpu *v, int vector,
bool_t force_ack)
}
done:
- vlapic_set_vector(vector, &vlapic->regs->data[APIC_ISR]);
+ if ( !has_viridian_synic(v->domain) ||
+ !viridian_synic_is_auto_eoi_sint(v, vector) )
+ vlapic_set_vector(vector, &vlapic->regs->data[APIC_ISR]);
+
vlapic_clear_irr(vector, vlapic);
return 1;
}
diff --git a/xen/include/asm-x86/hvm/hvm.h b/xen/include/asm-x86/hvm/hvm.h
index d8df6f4352..7892f98c7b 100644
--- a/xen/include/asm-x86/hvm/hvm.h
+++ b/xen/include/asm-x86/hvm/hvm.h
@@ -470,6 +470,9 @@ static inline bool hvm_get_guest_bndcfgs(struct vcpu *v,
u64 *val)
#define has_viridian_apic_assist(d) \
(is_viridian_domain(d) && (viridian_feature_mask(d) & HVMPV_apic_assist))
+#define has_viridian_synic(d) \
+ (is_viridian_domain(d) && (viridian_feature_mask(d) & HVMPV_synic))
+
static inline void hvm_inject_exception(
unsigned int vector, unsigned int type,
unsigned int insn_len, int error_code)
diff --git a/xen/include/asm-x86/hvm/viridian.h
b/xen/include/asm-x86/hvm/viridian.h
index 1d281d825e..6d40d391e1 100644
--- a/xen/include/asm-x86/hvm/viridian.h
+++ b/xen/include/asm-x86/hvm/viridian.h
@@ -26,10 +26,30 @@ struct viridian_page
void *ptr;
};
+union viridian_sint_msr
+{
+ uint64_t raw;
+ struct
+ {
+ uint64_t vector:8;
+ uint64_t reserved_preserved1:8;
+ uint64_t mask:1;
+ uint64_t auto_eoi:1;
+ uint64_t polling:1;
+ uint64_t reserved_preserved2:45;
+ } fields;
+};
+
struct viridian_vcpu
{
struct viridian_page vp_assist;
bool apic_assist_pending;
+ uint64_t scontrol;
+ uint64_t siefp;
+ struct viridian_page simp;
+ union viridian_sint_msr sint[16];
+ uint8_t vector_to_sintx[256];
+ unsigned long msg_pending;
uint64_t crash_param[5];
};
@@ -90,6 +110,10 @@ void viridian_apic_assist_set(struct vcpu *v);
bool viridian_apic_assist_completed(struct vcpu *v);
void viridian_apic_assist_clear(struct vcpu *v);
+bool viridian_synic_is_auto_eoi_sint(struct vcpu *v, uint8_t vector);
+void viridian_synic_poll_messages(struct vcpu *v);
+void viridian_synic_ack_sint(struct vcpu *v, uint8_t vector);
+
#endif /* __ASM_X86_HVM_VIRIDIAN_H__ */
/*
diff --git a/xen/include/public/arch-x86/hvm/save.h
b/xen/include/public/arch-x86/hvm/save.h
index 40be84ecda..ec3e4df12c 100644
--- a/xen/include/public/arch-x86/hvm/save.h
+++ b/xen/include/public/arch-x86/hvm/save.h
@@ -602,6 +602,8 @@ struct hvm_viridian_vcpu_context {
uint64_t vp_assist_msr;
uint8_t apic_assist_pending;
uint8_t _pad[7];
+ uint64_t simp_msr;
+ uint64_t sint_msr[16];
};
DECLARE_HVM_SAVE_TYPE(VIRIDIAN_VCPU, 17, struct hvm_viridian_vcpu_context);
diff --git a/xen/include/public/hvm/params.h b/xen/include/public/hvm/params.h
index 72f633ef2d..e7e3c7c892 100644
--- a/xen/include/public/hvm/params.h
+++ b/xen/include/public/hvm/params.h
@@ -146,6 +146,10 @@
#define _HVMPV_crash_ctl 6
#define HVMPV_crash_ctl (1 << _HVMPV_crash_ctl)
+/* Enable SYNIC MSRs */
+#define _HVMPV_synic 7
+#define HVMPV_synic (1 << _HVMPV_synic)
+
#define HVMPV_feature_mask \
(HVMPV_base_freq | \
HVMPV_no_freq | \
@@ -153,7 +157,8 @@
HVMPV_reference_tsc | \
HVMPV_hcall_remote_tlb_flush | \
HVMPV_apic_assist | \
- HVMPV_crash_ctl)
+ HVMPV_crash_ctl | \
+ HVMPV_synic)
#endif
--
2.20.1.2.gb21ebb671
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