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KVM: nVMX: Expose RDPMC-exiting only when guest supports PMU

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Issue was discovered when running kvm-unit-tests on KVM running as L1 on
top of Hyper-V.

When vmx_instruction_intercept unit-test attempts to run RDPMC to test
RDPMC-exiting, it is intercepted by L1 KVM which it's EXIT_REASON_RDPMC
handler raise #GP because vCPU exposed by Hyper-V doesn't support PMU.
Instead of unit-test expectation to be reflected with EXIT_REASON_RDPMC.

The reason vmx_instruction_intercept unit-test attempts to run RDPMC
even though Hyper-V doesn't support PMU is because L1 expose to L2
support for RDPMC-exiting. Which is reasonable to assume that is
supported only in case CPU supports PMU to being with.

Above issue can easily be simulated by modifying
vmx_instruction_intercept config in x86/unittests.cfg to run QEMU with
"-cpu host,+vmx,-pmu" and run unit-test.

To handle issue, change KVM to expose RDPMC-exiting only when guest
supports PMU.

Reported-by: Saar Amar <[email protected]>
Reviewed-by: Mihai Carabas <[email protected]>
Reviewed-by: Jim Mattson <[email protected]>
Signed-off-by: Liran Alon <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
This commit is contained in:
Liran Alon authored and Paolo Bonzini committed 2019-04-16 15:37:34 +02:00
1 parent 672ff6cff8
commit e51bfdb687
1 file changed
+25
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arch/x86/kvm/vmx/vmx.c
+25
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@@ -6856,6 +6856,30 @@ static void nested_vmx_entry_exit_ctls_update(struct kvm_vcpu *vcpu)
}
}
static bool guest_cpuid_has_pmu(struct kvm_vcpu *vcpu)
{
struct kvm_cpuid_entry2 *entry;
union cpuid10_eax eax;
entry = kvm_find_cpuid_entry(vcpu, 0xa, 0);
if (!entry)
return false;
eax.full = entry->eax;
return (eax.split.version_id > 0);
}
static void nested_vmx_procbased_ctls_update(struct kvm_vcpu *vcpu)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
bool pmu_enabled = guest_cpuid_has_pmu(vcpu);
if (pmu_enabled)
vmx->nested.msrs.procbased_ctls_high |= CPU_BASED_RDPMC_EXITING;
else
vmx->nested.msrs.procbased_ctls_high &= ~CPU_BASED_RDPMC_EXITING;
}
static void update_intel_pt_cfg(struct kvm_vcpu *vcpu)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
@@ -6944,6 +6968,7 @@ static void vmx_cpuid_update(struct kvm_vcpu *vcpu)
if (nested_vmx_allowed(vcpu)) {
nested_vmx_cr_fixed1_bits_update(vcpu);
nested_vmx_entry_exit_ctls_update(vcpu);
nested_vmx_procbased_ctls_update(vcpu);
}
if (boot_cpu_has(X86_FEATURE_INTEL_PT) &&