Suggested by Avi. Dropping PT_WRITABLE_MASK is under race condition with the hardware. Use update_spte() to avoid this.
Signed-off-by: Takuya Yoshikawa <[email protected]> --- arch/x86/kvm/mmu.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index bdb9fa9..e716def 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -3449,7 +3449,7 @@ void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot) for (i = 0; i < PT64_ENT_PER_PAGE; ++i) /* avoid RMW */ if (is_writable_pte(pt[i])) - pt[i] &= ~PT_WRITABLE_MASK; + update_spte(&pt[i], pt[i] & ~PT_WRITABLE_MASK); } kvm_flush_remote_tlbs(kvm); } -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
