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| author | Marc Zyngier <marc.zyngier@arm.com> | 2017-10-23 17:11:20 +0100 |
|---|---|---|
| committer | Christoffer Dall <christoffer.dall@linaro.org> | 2018-01-08 15:20:45 +0100 |
| commit | a9c0e12ebee56ef06b7eccdbc73bab71d0018df8 (patch) | |
| tree | 2bfc38bb928ea06772b9fde4933a4e1a47a9a189 /virt | |
| parent | d0e22b4ac3ba23c611739f554392bf5e217df49f (diff) | |
| download | linux-a9c0e12ebee56ef06b7eccdbc73bab71d0018df8.tar.gz linux-a9c0e12ebee56ef06b7eccdbc73bab71d0018df8.tar.bz2 linux-a9c0e12ebee56ef06b7eccdbc73bab71d0018df8.zip | |
KVM: arm/arm64: Only clean the dcache on translation fault
The only case where we actually need to perform a dcache maintenance
is when we map the page for the first time, and subsequent permission
faults do not require cache maintenance. Let's make it conditional
on not being a permission fault (and thus a translation fault).
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'virt')
| -rw-r--r-- | virt/kvm/arm/mmu.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c index 0417c8e2a81c..f956efbd933d 100644 --- a/virt/kvm/arm/mmu.c +++ b/virt/kvm/arm/mmu.c @@ -1400,7 +1400,9 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, new_pmd = kvm_s2pmd_mkwrite(new_pmd); kvm_set_pfn_dirty(pfn); } - clean_dcache_guest_page(vcpu, pfn, PMD_SIZE); + + if (fault_status != FSC_PERM) + clean_dcache_guest_page(vcpu, pfn, PMD_SIZE); if (exec_fault) { new_pmd = kvm_s2pmd_mkexec(new_pmd); @@ -1416,7 +1418,9 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, kvm_set_pfn_dirty(pfn); mark_page_dirty(kvm, gfn); } - clean_dcache_guest_page(vcpu, pfn, PAGE_SIZE); + + if (fault_status != FSC_PERM) + clean_dcache_guest_page(vcpu, pfn, PAGE_SIZE); if (exec_fault) { new_pte = kvm_s2pte_mkexec(new_pte); |