[PATCH] ARM64: KVM: Fix coherent_icache_guest_page() for host with external L3-cache.
Pranavkumar Sawargaonkar
pranavkumar at linaro.org
Wed Aug 14 07:45:05 EDT 2013
Systems with large external L3-cache (few MBs), might have dirty
content belonging to the guest page in L3-cache. To tackle this,
we need to flush such dirty content from d-cache so that guest
will see correct contents of guest page when guest MMU is disabled.
The patch fixes coherent_icache_guest_page() for external L3-cache.
Signed-off-by: Pranavkumar Sawargaonkar <pranavkumar at linaro.org>
Signed-off-by: Anup Patel <anup.patel at linaro.org>
---
arch/arm64/include/asm/kvm_mmu.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h
index efe609c..5129038 100644
--- a/arch/arm64/include/asm/kvm_mmu.h
+++ b/arch/arm64/include/asm/kvm_mmu.h
@@ -123,6 +123,8 @@ static inline void coherent_icache_guest_page(struct kvm *kvm, gfn_t gfn)
if (!icache_is_aliasing()) { /* PIPT */
unsigned long hva = gfn_to_hva(kvm, gfn);
flush_icache_range(hva, hva + PAGE_SIZE);
+ /* Flush d-cache for systems with external caches. */
+ __flush_dcache_area((void *) hva, PAGE_SIZE);
} else if (!icache_is_aivivt()) { /* non ASID-tagged VIVT */
/* any kind of VIPT cache */
__flush_icache_all();
--
1.7.9.5
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