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[PATCH] KVM: MMU: Flush guest tlb when reducing permissions on a pte

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If we reduce permissions on a pte, we must flush the cached copy of the pte
from the guest's tlb.

This is implemented at the moment by flushing the entire guest tlb, and can be
improved by flushing just the relevant virtual address, if it is known.

Signed-off-by: Avi Kivity <[email protected]>
Acked-by: Ingo Molnar <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Avi Kivity 2007-01-05 16:36:55 -08:00 • committed by Linus Torvalds
commit 40907d5768
1 changed files with 6 additions and 1 deletions
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7
drivers/kvm/mmu.c
View file

@ -383,6 +383,7 @@ static void rmap_write_protect(struct kvm_vcpu *vcpu, u64 gfn)
BUG_ON(!(*spte & PT_WRITABLE_MASK));
rmap_printk("rmap_write_protect: spte %p %llx\n", spte, *spte);
rmap_remove(vcpu, spte);
kvm_arch_ops->tlb_flush(vcpu);
*spte &= ~(u64)PT_WRITABLE_MASK;
}
}
@ -594,6 +595,7 @@ static void kvm_mmu_page_unlink_children(struct kvm_vcpu *vcpu,
rmap_remove(vcpu, &pt[i]);
pt[i] = 0;
}
kvm_arch_ops->tlb_flush(vcpu);
return;
}
@ -927,7 +929,10 @@ static inline void set_pte_common(struct kvm_vcpu *vcpu,
pgprintk("%s: found shadow page for %lx, marking ro\n",
__FUNCTION__, gfn);
access_bits &= ~PT_WRITABLE_MASK;
*shadow_pte &= ~PT_WRITABLE_MASK;
if (is_writeble_pte(*shadow_pte)) {
*shadow_pte &= ~PT_WRITABLE_MASK;
kvm_arch_ops->tlb_flush(vcpu);
}
}
}