BackPup/Linux
1
0 Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-10-07 05:31:08 -04:00
Code Issues Packages Projects Releases Wiki Activity

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

Browse Source 
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 <[email protected]>
Signed-off-by: Ben Gardon <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
This commit is contained in:
Ben Gardon authored and Paolo Bonzini committed 2021-02-04 05:27:45 -05:00
1 parent e25f0e0cd5
commit a2855afc7e
1 file changed
+10 -2
Download Patch File Download Diff File Expand all files Collapse all files
arch/x86/kvm/mmu/mmu.c
+10 -2
View File
@@ -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;
}