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KVM: x86: Uninline and export hv_track_root_tdp()

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Uninline and export Hyper-V's hv_track_root_tdp(), which is (somewhat
indirectly) the last remaining reference to kvm_x86_ops from vendor
modules, i.e. will allow unexporting kvm_x86_ops.  Reloading the TDP PGD
isn't the fastest of paths, hv_track_root_tdp() isn't exactly tiny, and
disallowing vendor code from accessing kvm_x86_ops provides nice-to-have
encapsulation of common x86 code (and of Hyper-V code for that matter).

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220128005208.4008533-10-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2022-01-28 00:51:55 +00:00 committed by Paolo Bonzini
parent 0bcd556e15
commit 3d4421f8f2
2 changed files with 15 additions and 13 deletions
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14
arch/x86/kvm/kvm_onhyperv.c
View File

@ -92,3 +92,17 @@ int hv_remote_flush_tlb(struct kvm *kvm)
return hv_remote_flush_tlb_with_range(kvm, NULL); return hv_remote_flush_tlb_with_range(kvm, NULL);
} }
EXPORT_SYMBOL_GPL(hv_remote_flush_tlb); EXPORT_SYMBOL_GPL(hv_remote_flush_tlb);
void hv_track_root_tdp(struct kvm_vcpu *vcpu, hpa_t root_tdp)
{
struct kvm_arch *kvm_arch = &vcpu->kvm->arch;
if (kvm_x86_ops.tlb_remote_flush == hv_remote_flush_tlb) {
spin_lock(&kvm_arch->hv_root_tdp_lock);
vcpu->arch.hv_root_tdp = root_tdp;
if (root_tdp != kvm_arch->hv_root_tdp)
kvm_arch->hv_root_tdp = INVALID_PAGE;
spin_unlock(&kvm_arch->hv_root_tdp_lock);
}
}
EXPORT_SYMBOL_GPL(hv_track_root_tdp);

14
arch/x86/kvm/kvm_onhyperv.h
View File

@ -10,19 +10,7 @@
int hv_remote_flush_tlb_with_range(struct kvm *kvm, int hv_remote_flush_tlb_with_range(struct kvm *kvm,
struct kvm_tlb_range *range); struct kvm_tlb_range *range);
int hv_remote_flush_tlb(struct kvm *kvm); int hv_remote_flush_tlb(struct kvm *kvm);
void hv_track_root_tdp(struct kvm_vcpu *vcpu, hpa_t root_tdp);
static inline void hv_track_root_tdp(struct kvm_vcpu *vcpu, hpa_t root_tdp)
{
struct kvm_arch *kvm_arch = &vcpu->kvm->arch;
if (kvm_x86_ops.tlb_remote_flush == hv_remote_flush_tlb) {
spin_lock(&kvm_arch->hv_root_tdp_lock);
vcpu->arch.hv_root_tdp = root_tdp;
if (root_tdp != kvm_arch->hv_root_tdp)
kvm_arch->hv_root_tdp = INVALID_PAGE;
spin_unlock(&kvm_arch->hv_root_tdp_lock);
}
}
#else /* !CONFIG_HYPERV */ #else /* !CONFIG_HYPERV */
static inline void hv_track_root_tdp(struct kvm_vcpu *vcpu, hpa_t root_tdp) static inline void hv_track_root_tdp(struct kvm_vcpu *vcpu, hpa_t root_tdp)
{ {