x86/mm: add a function to check if a pfn is UC/UC-/WC

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Check whether the PAT memory type of a pfn cannot be overridden by
MTRR UC memory type, i.e. the PAT memory type is UC, UC- or WC. This
function will be used by KVM to distinguish MMIO pfns and give them
UC memory type in the EPT page tables (on Intel processors, EPT
memory types work like MTRRs).

Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com>
Reviewed-by: Xiao Guangrong <xiaoguangrong@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>

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Haozhong Zhang 2017-12-20 15:29:28 +08:00 • committed by Radim Krčmář

parent 05992edc27

commit b8d7044bcf

2 changed files with 21 additions and 0 deletions

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2

arch/x86/include/asm/pat.h

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19

arch/x86/mm/pat.c

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