KVM: VMX: Track root HPA instead of EPTP for paravirt Hyper-V TLB flush

Track the address of the top-level EPT struct, a.k.a. the root HPA,
instead of the EPTP itself for Hyper-V's paravirt TLB flush.  The
paravirt API takes only the address, not the full EPTP, and in theory
tracking the EPTP could lead to false negatives, e.g. if the HPA matched
but the attributes in the EPTP do not.  In practice, such a mismatch is
extremely unlikely, if not flat out impossible, given how KVM generates
the EPTP.

Opportunsitically rename the related fields to use the 'root'
nomenclature, and to prefix them with 'hv_' to connect them to Hyper-V's
paravirt TLB flushing.

Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210305183123.3978098-12-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/arch/x86/kvm/vmx/vmx.h b/arch/x86/kvm/vmx/vmx.h
index 6d97b5a64b62..0fb3236b0283 100644
--- a/arch/x86/kvm/vmx/vmx.h
+++ b/arch/x86/kvm/vmx/vmx.h
@@ -326,7 +326,7 @@ struct vcpu_vmx {
 	u64 msr_ia32_feature_control;
 	u64 msr_ia32_feature_control_valid_bits;
 #if IS_ENABLED(CONFIG_HYPERV)
-	u64 ept_pointer;
+	u64 hv_root_ept;
 #endif
 
 	struct pt_desc pt_desc;
@@ -348,8 +348,8 @@ struct kvm_vmx {
 	gpa_t ept_identity_map_addr;
 
 #if IS_ENABLED(CONFIG_HYPERV)
-	hpa_t hv_tlb_eptp;
-	spinlock_t ept_pointer_lock;
+	hpa_t hv_root_ept;
+	spinlock_t hv_root_ept_lock;
 #endif
 };