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Commit a9c0e12e authored by Marc Zyngier's avatar Marc Zyngier Committed by Christoffer Dall
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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: default avatarChristoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: default avatarChristoffer Dall <christoffer.dall@linaro.org>
parent d0e22b4a

virt/kvm/arm/mmu.c

+6 −2
Original line number Diff line number Diff line
@@ -1400,6 +1400,8 @@ 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);

		}



		if (fault_status != FSC_PERM)

			clean_dcache_guest_page(vcpu, pfn, PMD_SIZE);



		if (exec_fault) {
@@ -1416,6 +1418,8 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, 
			kvm_set_pfn_dirty(pfn);

			mark_page_dirty(kvm, gfn);

		}



		if (fault_status != FSC_PERM)

			clean_dcache_guest_page(vcpu, pfn, PAGE_SIZE);



		if (exec_fault) {