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KVM: x86/mmu: Allow parallel page faults for the TDP MMU

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Make the last few changes necessary to enable the TDP MMU to handle page
faults in parallel while holding the mmu_lock in read mode.

Reviewed-by: Peter Feiner <pfeiner@google.com>
Signed-off-by: Ben Gardon <bgardon@google.com>
Message-Id: <20210202185734.1680553-24-bgardon@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Ben Gardon 2021-02-02 10:57:29 -08:00 committed by Paolo Bonzini
parent e25f0e0cd5
commit a2855afc7e
1 changed files with 10 additions and 2 deletions
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12
arch/x86/kvm/mmu/mmu.c
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@ -3718,7 +3718,12 @@ static int direct_page_fault(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code,
return r;
r = RET_PF_RETRY;
write_lock(&vcpu->kvm->mmu_lock);
if (is_tdp_mmu_root(vcpu->kvm, vcpu->arch.mmu->root_hpa))
read_lock(&vcpu->kvm->mmu_lock);
else
write_lock(&vcpu->kvm->mmu_lock);
if (mmu_notifier_retry(vcpu->kvm, mmu_seq))
goto out_unlock;
r = make_mmu_pages_available(vcpu);
@ -3733,7 +3738,10 @@ static int direct_page_fault(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code,
prefault, is_tdp);
out_unlock:
write_unlock(&vcpu->kvm->mmu_lock);
if (is_tdp_mmu_root(vcpu->kvm, vcpu->arch.mmu->root_hpa))
read_unlock(&vcpu->kvm->mmu_lock);
else
write_unlock(&vcpu->kvm->mmu_lock);
kvm_release_pfn_clean(pfn);
return r;
}