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kvm: vmx: Raise #UD on unsupported RDSEED

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A guest may not be configured to support RDSEED, even when the host
does. If the guest does not support RDSEED, intercept the instruction
and synthesize #UD. Also clear the "allowed-1" bit for RDSEED exiting
in the IA32_VMX_PROCBASED_CTLS2 MSR.

Signed-off-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Jim Mattson 2017-08-23 16:32:03 -07:00 committed by Paolo Bonzini
parent 45ec368c9a
commit 75f4fc8da9
1 changed files with 23 additions and 1 deletions
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24
arch/x86/kvm/vmx.c
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@ -2818,7 +2818,6 @@ static void nested_vmx_setup_ctls_msrs(struct vcpu_vmx *vmx)
vmx->nested.nested_vmx_secondary_ctls_high);
vmx->nested.nested_vmx_secondary_ctls_low = 0;
vmx->nested.nested_vmx_secondary_ctls_high &=
SECONDARY_EXEC_RDSEED |
SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES |
SECONDARY_EXEC_DESC |
SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE |
@ -3671,6 +3670,7 @@ static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf)
SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY |
SECONDARY_EXEC_SHADOW_VMCS |
SECONDARY_EXEC_XSAVES |
SECONDARY_EXEC_RDSEED |
SECONDARY_EXEC_RDRAND |
SECONDARY_EXEC_ENABLE_PML |
SECONDARY_EXEC_TSC_SCALING |
@ -5280,6 +5280,12 @@ static bool vmx_rdrand_supported(void)
SECONDARY_EXEC_RDRAND;
}
static bool vmx_rdseed_supported(void)
{
return vmcs_config.cpu_based_2nd_exec_ctrl &
SECONDARY_EXEC_RDSEED;
}
static void vmx_compute_secondary_exec_control(struct vcpu_vmx *vmx)
{
struct kvm_vcpu *vcpu = &vmx->vcpu;
@ -5364,6 +5370,21 @@ static void vmx_compute_secondary_exec_control(struct vcpu_vmx *vmx)
}
}
if (vmx_rdseed_supported()) {
bool rdseed_enabled = guest_cpuid_has(vcpu, X86_FEATURE_RDSEED);
if (rdseed_enabled)
exec_control &= ~SECONDARY_EXEC_RDSEED;
if (nested) {
if (rdseed_enabled)
vmx->nested.nested_vmx_secondary_ctls_high |=
SECONDARY_EXEC_RDSEED;
else
vmx->nested.nested_vmx_secondary_ctls_high &=
~SECONDARY_EXEC_RDSEED;
}
}
vmx->secondary_exec_control = exec_control;
}
@ -8119,6 +8140,7 @@ static int (*const kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu) = {
[EXIT_REASON_INVEPT] = handle_invept,
[EXIT_REASON_INVVPID] = handle_invvpid,
[EXIT_REASON_RDRAND] = handle_invalid_op,
[EXIT_REASON_RDSEED] = handle_invalid_op,
[EXIT_REASON_XSAVES] = handle_xsaves,
[EXIT_REASON_XRSTORS] = handle_xrstors,
[EXIT_REASON_PML_FULL] = handle_pml_full,