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@xxxxxxxxxx> Signed-off-by: Ben Gardon <bgardon@xxxxxxxxxx> --- arch/x86/kvm/mmu/mmu.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index 280d7cd6f94b..fa111ceb67d4 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -3724,7 +3724,12 @@ static int direct_page_fault(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code, return r; r = RET_PF_RETRY; - kvm_mmu_lock(vcpu->kvm); + + if (is_tdp_mmu_root(vcpu->kvm, vcpu->arch.mmu->root_hpa)) + kvm_mmu_lock_shared(vcpu->kvm); + else + kvm_mmu_lock(vcpu->kvm); + if (mmu_notifier_retry(vcpu->kvm, mmu_seq)) goto out_unlock; r = make_mmu_pages_available(vcpu); @@ -3739,7 +3744,10 @@ static int direct_page_fault(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code, prefault, is_tdp); out_unlock: - kvm_mmu_unlock(vcpu->kvm); + if (is_tdp_mmu_root(vcpu->kvm, vcpu->arch.mmu->root_hpa)) + kvm_mmu_unlock_shared(vcpu->kvm); + else + kvm_mmu_unlock(vcpu->kvm); kvm_release_pfn_clean(pfn); return r; } -- 2.30.0.284.gd98b1dd5eaa7-goog
