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| author | KarimAllah Ahmed <karahmed@amazon.de> | 2019-01-31 21:24:44 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2019-04-30 21:49:46 +0200 |
| commit | 0c55671f84fffe591e8435c93a8c83286fd6b8eb (patch) | |
| tree | 19ffa33fdc2f35cadd344f601b60810b3758fcd1 /arch/x86/kvm/mmu.c | |
| parent | KVM/nVMX: Use page_address_valid in a few more locations (diff) | |
| download | linux-0c55671f84fffe591e8435c93a8c83286fd6b8eb.tar.xz linux-0c55671f84fffe591e8435c93a8c83286fd6b8eb.zip | |
kvm, x86: Properly check whether a pfn is an MMIO or not
pfn_valid check is not sufficient because it only checks if a page has a struct
page or not, if "mem=" was passed to the kernel some valid pages won't have a
struct page. This means that if guests were assigned valid memory that lies
after the mem= boundary it will be passed uncached to the guest no matter what
the guest caching attributes are for this memory.
Introduce a new function e820__mapped_raw_any which is equivalent to
e820__mapped_any but uses the original e820 unmodified and use it to
identify real *RAM*.
Signed-off-by: KarimAllah Ahmed <karahmed@amazon.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/mmu.c')
| -rw-r--r-- | arch/x86/kvm/mmu.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index e10962dfc203..b1f6451022e5 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -44,6 +44,7 @@ #include <asm/page.h> #include <asm/pat.h> #include <asm/cmpxchg.h> +#include <asm/e820/api.h> #include <asm/io.h> #include <asm/vmx.h> #include <asm/kvm_page_track.h> @@ -2892,7 +2893,9 @@ static bool kvm_is_mmio_pfn(kvm_pfn_t pfn) */ (!pat_enabled() || pat_pfn_immune_to_uc_mtrr(pfn)); - return true; + return !e820__mapped_raw_any(pfn_to_hpa(pfn), + pfn_to_hpa(pfn + 1) - 1, + E820_TYPE_RAM); } /* Bits which may be returned by set_spte() */ |