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Subject[PATCH v2 27/30] KVM: x86: hyper-v: Honor HV_X64_EX_PROCESSOR_MASKS_RECOMMENDED bit
Date
Hypercalls which use extended processor masks are only available when
HV_X64_EX_PROCESSOR_MASKS_RECOMMENDED privilege bit is exposed (and
'RECOMMENDED' is rather a misnomer).

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
arch/x86/kvm/hyperv.c | 8 ++++++++
1 file changed, 8 insertions(+)

diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index ba5af4d27ccf..4ad27e7cdb05 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -2046,11 +2046,19 @@ static bool hv_check_hypercall_access(struct kvm_vcpu_hv *hv_vcpu, u16 code)
hv_vcpu->cpuid_cache.features_ebx & HV_DEBUGGING;
case HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX:
case HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX:
+ if (!(hv_vcpu->cpuid_cache.enlightenments_eax &
+ HV_X64_EX_PROCESSOR_MASKS_RECOMMENDED))
+ return false;
+ fallthrough;
case HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST:
case HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE:
return hv_vcpu->cpuid_cache.enlightenments_eax &
HV_X64_REMOTE_TLB_FLUSH_RECOMMENDED;
case HVCALL_SEND_IPI_EX:
+ if (!(hv_vcpu->cpuid_cache.enlightenments_eax &
+ HV_X64_EX_PROCESSOR_MASKS_RECOMMENDED))
+ return false;
+ fallthrough;
case HVCALL_SEND_IPI:
return hv_vcpu->cpuid_cache.enlightenments_eax &
HV_X64_CLUSTER_IPI_RECOMMENDED;
--
2.31.1
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