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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 2/8] x86/cpuid: Split update_domain_cpuid_info() in half
update_domain_cpuid_info() currently serves two purposes. First to merge new
CPUID data from the toolstack, and second, to perform any necessary updating
of derived domain/vcpu settings.
The first part of this is going to be superseded by a new and substantially
more efficient hypercall.
Carve the second part out into a new domain_cpu_policy_changed() helper, and
call this from the remains of update_domain_cpuid_info().
This does drop the call_policy_changed, but with the new hypercall hypercall
in place, the common case will be a single call per domain. Dropping the
optimisation here allows for a cleaner set of following changes.
Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
CC: Jan Beulich <JBeulich@xxxxxxxx>
CC: Wei Liu <wl@xxxxxxx>
CC: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
xen/arch/x86/domctl.c | 245 ++++++++++++++++++++------------------------------
1 file changed, 99 insertions(+), 146 deletions(-)
diff --git a/xen/arch/x86/domctl.c b/xen/arch/x86/domctl.c
index a744696c6b..d15ae066c3 100644
--- a/xen/arch/x86/domctl.c
+++ b/xen/arch/x86/domctl.c
@@ -46,101 +46,14 @@ static int gdbsx_guest_mem_io(domid_t domid, struct
xen_domctl_gdbsx_memio *iop)
return iop->remain ? -EFAULT : 0;
}
-static int update_domain_cpuid_info(struct domain *d,
- const struct xen_domctl_cpuid *ctl)
+static void domain_cpu_policy_changed(struct domain *d)
{
- struct cpuid_policy *p = d->arch.cpuid;
- const struct cpuid_leaf leaf = { ctl->eax, ctl->ebx, ctl->ecx, ctl->edx };
- int old_vendor = p->x86_vendor;
- unsigned int old_7d0 = p->feat.raw[0].d, old_e8b = p->extd.raw[8].b;
- bool call_policy_changed = false; /* Avoid for_each_vcpu() unnecessarily */
-
- /*
- * Skip update for leaves we don't care about, to avoid the overhead of
- * recalculate_cpuid_policy().
- */
- switch ( ctl->input[0] )
- {
- case 0x00000000 ... ARRAY_SIZE(p->basic.raw) - 1:
- if ( ctl->input[0] == 4 &&
- ctl->input[1] >= ARRAY_SIZE(p->cache.raw) )
- return 0;
-
- if ( ctl->input[0] == 7 &&
- ctl->input[1] >= ARRAY_SIZE(p->feat.raw) )
- return 0;
-
- if ( ctl->input[0] == 0xb &&
- ctl->input[1] >= ARRAY_SIZE(p->topo.raw) )
- return 0;
-
- BUILD_BUG_ON(ARRAY_SIZE(p->xstate.raw) < 2);
- if ( ctl->input[0] == XSTATE_CPUID &&
- ctl->input[1] != 1 ) /* Everything else automatically calculated.
*/
- return 0;
- break;
-
- case 0x40000000: case 0x40000100:
- /* Only care about the max_leaf limit. */
-
- case 0x80000000 ... 0x80000000 + ARRAY_SIZE(p->extd.raw) - 1:
- break;
-
- default:
- return 0;
- }
-
- /* Insert ctl data into cpuid_policy. */
- switch ( ctl->input[0] )
- {
- case 0x00000000 ... ARRAY_SIZE(p->basic.raw) - 1:
- switch ( ctl->input[0] )
- {
- case 4:
- p->cache.raw[ctl->input[1]] = leaf;
- break;
-
- case 7:
- p->feat.raw[ctl->input[1]] = leaf;
- break;
-
- case 0xb:
- p->topo.raw[ctl->input[1]] = leaf;
- break;
-
- case XSTATE_CPUID:
- p->xstate.raw[ctl->input[1]] = leaf;
- break;
-
- default:
- p->basic.raw[ctl->input[0]] = leaf;
- break;
- }
- break;
-
- case 0x40000000:
- p->hv_limit = ctl->eax;
- break;
+ const struct cpuid_policy *p = d->arch.cpuid;
+ struct vcpu *v;
- case 0x40000100:
- p->hv2_limit = ctl->eax;
- break;
-
- case 0x80000000 ... 0x80000000 + ARRAY_SIZE(p->extd.raw) - 1:
- p->extd.raw[ctl->input[0] - 0x80000000] = leaf;
- break;
- }
-
- recalculate_cpuid_policy(d);
-
- switch ( ctl->input[0] )
+ if ( is_pv_domain(d) )
{
- case 0:
- call_policy_changed = (p->x86_vendor != old_vendor);
- break;
-
- case 1:
- if ( is_pv_domain(d) && ((levelling_caps & LCAP_1cd) == LCAP_1cd) )
+ if ( ((levelling_caps & LCAP_1cd) == LCAP_1cd) )
{
uint64_t mask = cpuidmask_defaults._1cd;
uint32_t ecx = p->basic._1c;
@@ -197,25 +110,18 @@ static int update_domain_cpuid_info(struct domain *d,
d->arch.pv.cpuidmasks->_1cd = mask;
}
- break;
- case 6:
- if ( is_pv_domain(d) && ((levelling_caps & LCAP_6c) == LCAP_6c) )
+ if ( ((levelling_caps & LCAP_6c) == LCAP_6c) )
{
uint64_t mask = cpuidmask_defaults._6c;
if ( boot_cpu_data.x86_vendor == X86_VENDOR_AMD )
- mask &= (~0ULL << 32) | ctl->ecx;
+ mask &= (~0ULL << 32) | p->basic.raw[6].c;
d->arch.pv.cpuidmasks->_6c = mask;
}
- break;
-
- case 7:
- if ( ctl->input[1] != 0 )
- break;
- if ( is_pv_domain(d) && ((levelling_caps & LCAP_7ab0) == LCAP_7ab0) )
+ if ( ((levelling_caps & LCAP_7ab0) == LCAP_7ab0) )
{
uint64_t mask = cpuidmask_defaults._7ab0;
@@ -232,35 +138,7 @@ static int update_domain_cpuid_info(struct domain *d,
d->arch.pv.cpuidmasks->_7ab0 = mask;
}
- /*
- * If the IBRS/IBPB policy has changed, we need to recalculate the MSR
- * interception bitmaps.
- */
- call_policy_changed = (is_hvm_domain(d) &&
- ((old_7d0 ^ p->feat.raw[0].d) &
- (cpufeat_mask(X86_FEATURE_IBRSB) |
- cpufeat_mask(X86_FEATURE_L1D_FLUSH))));
- break;
-
- case 0xa:
- if ( boot_cpu_data.x86_vendor != X86_VENDOR_INTEL )
- break;
-
- /* If PMU version is zero then the guest doesn't have VPMU */
- if ( p->basic.pmu_version == 0 )
- {
- struct vcpu *v;
-
- for_each_vcpu ( d, v )
- vpmu_destroy(v);
- }
- break;
-
- case 0xd:
- if ( ctl->input[1] != 1 )
- break;
-
- if ( is_pv_domain(d) && ((levelling_caps & LCAP_Da1) == LCAP_Da1) )
+ if ( ((levelling_caps & LCAP_Da1) == LCAP_Da1) )
{
uint64_t mask = cpuidmask_defaults.Da1;
uint32_t eax = p->xstate.Da1;
@@ -270,10 +148,8 @@ static int update_domain_cpuid_info(struct domain *d,
d->arch.pv.cpuidmasks->Da1 = mask;
}
- break;
- case 0x80000001:
- if ( is_pv_domain(d) && ((levelling_caps & LCAP_e1cd) == LCAP_e1cd) )
+ if ( ((levelling_caps & LCAP_e1cd) == LCAP_e1cd) )
{
uint64_t mask = cpuidmask_defaults.e1cd;
uint32_t ecx = p->extd.e1c;
@@ -317,27 +193,104 @@ static int update_domain_cpuid_info(struct domain *d,
d->arch.pv.cpuidmasks->e1cd = mask;
}
+ }
+
+ for_each_vcpu( d, v )
+ {
+ cpuid_policy_updated(v);
+
+ /* If PMU version is zero then the guest doesn't have VPMU */
+ if ( boot_cpu_data.x86_vendor == X86_VENDOR_INTEL &&
+ p->basic.pmu_version == 0 )
+ vpmu_destroy(v);
+ }
+}
+
+static int update_domain_cpuid_info(struct domain *d,
+ const struct xen_domctl_cpuid *ctl)
+{
+ struct cpuid_policy *p = d->arch.cpuid;
+ const struct cpuid_leaf leaf = { ctl->eax, ctl->ebx, ctl->ecx, ctl->edx };
+
+ /*
+ * Skip update for leaves we don't care about, to avoid the overhead of
+ * recalculate_cpuid_policy().
+ */
+ switch ( ctl->input[0] )
+ {
+ case 0x00000000 ... ARRAY_SIZE(p->basic.raw) - 1:
+ if ( ctl->input[0] == 4 &&
+ ctl->input[1] >= ARRAY_SIZE(p->cache.raw) )
+ return 0;
+
+ if ( ctl->input[0] == 7 &&
+ ctl->input[1] >= ARRAY_SIZE(p->feat.raw) )
+ return 0;
+
+ if ( ctl->input[0] == 0xb &&
+ ctl->input[1] >= ARRAY_SIZE(p->topo.raw) )
+ return 0;
+
+ BUILD_BUG_ON(ARRAY_SIZE(p->xstate.raw) < 2);
+ if ( ctl->input[0] == XSTATE_CPUID &&
+ ctl->input[1] != 1 ) /* Everything else automatically calculated.
*/
+ return 0;
break;
- case 0x80000008:
- /*
- * If the IBPB policy has changed, we need to recalculate the MSR
- * interception bitmaps.
- */
- call_policy_changed = (is_hvm_domain(d) &&
- ((old_e8b ^ p->extd.raw[8].b) &
- cpufeat_mask(X86_FEATURE_IBPB)));
+ case 0x40000000: case 0x40000100:
+ /* Only care about the max_leaf limit. */
+
+ case 0x80000000 ... 0x80000000 + ARRAY_SIZE(p->extd.raw) - 1:
break;
+
+ default:
+ return 0;
}
- if ( call_policy_changed )
+ /* Insert ctl data into cpuid_policy. */
+ switch ( ctl->input[0] )
{
- struct vcpu *v;
+ case 0x00000000 ... ARRAY_SIZE(p->basic.raw) - 1:
+ switch ( ctl->input[0] )
+ {
+ case 4:
+ p->cache.raw[ctl->input[1]] = leaf;
+ break;
+
+ case 7:
+ p->feat.raw[ctl->input[1]] = leaf;
+ break;
+
+ case 0xb:
+ p->topo.raw[ctl->input[1]] = leaf;
+ break;
- for_each_vcpu( d, v )
- cpuid_policy_updated(v);
+ case XSTATE_CPUID:
+ p->xstate.raw[ctl->input[1]] = leaf;
+ break;
+
+ default:
+ p->basic.raw[ctl->input[0]] = leaf;
+ break;
+ }
+ break;
+
+ case 0x40000000:
+ p->hv_limit = ctl->eax;
+ break;
+
+ case 0x40000100:
+ p->hv2_limit = ctl->eax;
+ break;
+
+ case 0x80000000 ... 0x80000000 + ARRAY_SIZE(p->extd.raw) - 1:
+ p->extd.raw[ctl->input[0] - 0x80000000] = leaf;
+ break;
}
+ recalculate_cpuid_policy(d);
+ domain_cpu_policy_changed(d);
+
return 0;
}
--
2.11.0
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