[PATCH] KVM:arm/arm64: dcache need be coherent unconditionally

[Peng Hao]

For emulation devices just like vga, keeping coherent dcache between
guest and host timely is needed.
Now the display of vnc-viewer will not update continuously and the
patch can fix up.

Signed-off-by: Peng Hao <peng.hao2 at zte.com.cn>
---
 virt/kvm/arm/mmu.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c
index ec62d1c..4a28395e 100644
--- a/virt/kvm/arm/mmu.c
+++ b/virt/kvm/arm/mmu.c
@@ -1416,8 +1416,7 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
 			kvm_set_pfn_dirty(pfn);
 		}
 
-		if (fault_status != FSC_PERM)
-			clean_dcache_guest_page(pfn, PMD_SIZE);
+		clean_dcache_guest_page(pfn, PMD_SIZE);
 
 		if (exec_fault) {
 			new_pmd = kvm_s2pmd_mkexec(new_pmd);
@@ -1438,8 +1437,7 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
 			mark_page_dirty(kvm, gfn);
 		}
 
-		if (fault_status != FSC_PERM)
-			clean_dcache_guest_page(pfn, PAGE_SIZE);
+		clean_dcache_guest_page(pfn, PAGE_SIZE);
 
 		if (exec_fault) {
 			new_pte = kvm_s2pte_mkexec(new_pte);
-- 
1.8.3.1