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KVM: arm/arm64: Only clean the dcache on translation fault

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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 <[email protected]>
Signed-off-by: Marc Zyngier <[email protected]>
Signed-off-by: Christoffer Dall <[email protected]>
This commit is contained in:
Marc Zyngier authored and Christoffer Dall committed 2018-01-08 15:20:45 +01:00
1 parent d0e22b4ac3
commit a9c0e12ebe
1 file changed
+6 -2
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virt/kvm/arm/mmu.c
+6 -2
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@@ -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);