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KVM: MMU: fix SMAP virtualization

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KVM may turn a user page to a kernel page when kernel writes a readonly
user page if CR0.WP = 1. This shadow page entry will be reused after
SMAP is enabled so that kernel is allowed to access this user page

Fix it by setting SMAP && !CR0.WP into shadow page's role and reset mmu
once CR4.SMAP is updated

Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Xiao Guangrong
2015-05-11 22:55:21 +08:00
committed by Paolo Bonzini
parent 428e3d0857
commit edc90b7dc4
5 changed files with 30 additions and 15 deletions
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arch/x86/include/asm/kvm_host.h
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@@ -207,6 +207,7 @@ union kvm_mmu_page_role {
unsigned nxe:1;
unsigned cr0_wp:1;
unsigned smep_andnot_wp:1;
unsigned smap_andnot_wp:1;
};
};