diff options
| author | Oliver Upton <oliver.upton@linux.dev> | 2022-12-02 21:51:55 +0300 |
|---|---|---|
| committer | Oliver Upton <oliver.upton@linux.dev> | 2023-01-13 00:09:20 +0300 |
| commit | fc61f554e6947edd21cd84fb814f8418349a3569 (patch) | |
| tree | c42d6a473a8ba916d293a007722a601dd7dd6f77 /arch/arm64/kvm/mmu.c | |
| parent | 7d29a2407df612b0903cee94fc3469d7335b442c (diff) | |
| download | linux-fc61f554e6947edd21cd84fb814f8418349a3569.tar.xz | |
KVM: arm64: Handle access faults behind the read lock
As the underlying software walkers are able to traverse and update
stage-2 in parallel there is no need to serialize access faults.
Only take the read lock when handling an access fault.
Link: https://lore.kernel.org/r/20221202185156.696189-6-oliver.upton@linux.dev
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Diffstat (limited to 'arch/arm64/kvm/mmu.c')
| -rw-r--r-- | arch/arm64/kvm/mmu.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c index edfbe85f8f8a..d24ce2ddb38c 100644 --- a/arch/arm64/kvm/mmu.c +++ b/arch/arm64/kvm/mmu.c @@ -1406,10 +1406,10 @@ static void handle_access_fault(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa) trace_kvm_access_fault(fault_ipa); - write_lock(&vcpu->kvm->mmu_lock); + read_lock(&vcpu->kvm->mmu_lock); mmu = vcpu->arch.hw_mmu; pte = kvm_pgtable_stage2_mkyoung(mmu->pgt, fault_ipa); - write_unlock(&vcpu->kvm->mmu_lock); + read_unlock(&vcpu->kvm->mmu_lock); if (kvm_pte_valid(pte)) kvm_set_pfn_accessed(kvm_pte_to_pfn(pte)); |