| From aa9e99f77f92814a0d83af8e6ed3148458d0f611 Mon Sep 17 00:00:00 2001 |
| From: Laurentiu Tudor <laurentiu.tudor@nxp.com> |
| Date: Tue, 26 Jul 2016 15:43:43 +0300 |
| Subject: [PATCH] arm64: KVM: support flushing device memory |
| |
| In the current implementation, trying to flush |
| memory not covered by the linear map (e.g. device |
| memory) causes a crash. Add support for flushing |
| "non-normal" memory by explicitly ioremap()-ing |
| it when such a case appears and do the cache flush |
| through this temporary mapping. |
| This allows dropping the special checks for qman |
| cacheable region when doing cache flushes. |
| |
| Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com> |
| [fixed formatting issue] |
| Signed-off-by: Diana Craciun <diana.craciun@nxp.com> |
| --- |
| arch/arm64/include/asm/kvm_mmu.h | 12 ++++++++++-- |
| 1 file changed, 10 insertions(+), 2 deletions(-) |
| |
| --- a/arch/arm64/include/asm/kvm_mmu.h |
| +++ b/arch/arm64/include/asm/kvm_mmu.h |
| @@ -341,8 +341,16 @@ static inline void __invalidate_icache_g |
| static inline void __kvm_flush_dcache_pte(pte_t pte) |
| { |
| if (!cpus_have_const_cap(ARM64_HAS_STAGE2_FWB)) { |
| - struct page *page = pte_page(pte); |
| - kvm_flush_dcache_to_poc(page_address(page), PAGE_SIZE); |
| + if (pfn_valid(pte_pfn(pte))) { |
| + struct page *page = pte_page(pte); |
| + |
| + kvm_flush_dcache_to_poc(page_address(page), PAGE_SIZE); |
| + } else { |
| + void __iomem *va = ioremap_cache_ns(pte_pfn(pte) << PAGE_SHIFT, PAGE_SIZE); |
| + |
| + kvm_flush_dcache_to_poc(va, PAGE_SIZE); |
| + iounmap(va); |
| + } |
| } |
| } |
| |