Commit 69325a12 authored May 27, 2010 by Avi Kivity

KVM: MMU: Remove user access when allowing kernel access to gpte.w=0 page

If cr0.wp=0, we have to allow the guest kernel access to a page with pte.w=0.
We do that by setting spte.w=1, since the host cr0.wp must remain set so the
host can write protect pages. Once we allow write access, we must remove
user access otherwise we mistakenly allow the user to write the page.

Reviewed-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

parent 3be2264b

arch/x86/kvm/mmu.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -1815,6 +1815,9 @@ static int set_spte(struct kvm_vcpu vcpu, u64 sptep,

		spte \|= PT_WRITABLE_MASK;

		if (!tdp_enabled && !(pte_access & ACC_WRITE_MASK))
		spte &= ~PT_USER_MASK;

		/*
		* Optimization: for pte sync, if spte was writable the hash
		* lookup is unnecessary (and expensive). Write protection

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