redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

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>
5.4-rM2-2.2.x-imx-squashed
Laurentiu Tudor 2016-07-26 15:43:43 +03:00 committed by Dong Aisheng
parent 219d54332a
commit ebf350de6a
1 changed files with 10 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
arch/arm64/include/asm/kvm_mmu.h
View File

@ -341,8 +341,16 @@ static inline void __invalidate_icache_guest_page(kvm_pfn_t pfn,
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);
}
}
}