KVM, pkeys: save/restore PKRU when guest/host switches

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Currently XSAVE state of host is not restored after VM-exit and PKRU
is managed by XSAVE so the PKRU from guest is still controlling the
memory access even if the CPU is running the code of host. This is
not safe as KVM needs to access the memory of userspace (e,g QEMU) to
do some emulation.

So we save/restore PKRU when guest/host switches.

Signed-off-by: Huaitong Han <huaitong.han@intel.com>
Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Xiao Guangrong 2016-03-22 16:51:18 +08:00 • committed by Paolo Bonzini

parent 9e90199c25

commit 1be0e61c1f

1 changed files with 23 additions and 0 deletions

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arch/x86/kvm/vmx.c

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