Messages in this thread | | | Subject | Re: [PATCH V2 2/3] KVM: X86: Set the hardware DR6 only when KVM_DEBUGREG_WONT_EXIT | From | Paolo Bonzini <> | Date | Tue, 10 Aug 2021 14:49:54 +0200 |
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On 10/08/21 12:46, Lai Jiangshan wrote: > I'm OK with it. But I don't think the sketched idea would cause DR6 to > be marked uselessly as dirty in SVM. It doesn't mark it dirty if the > value is unchanged, and the value is always DR6_ACTIVE_LOW except when > it just clears KVM_DEBUGREG_WONT_EXIT.
It would be marked dirty if it is not DR6_ACTIVE_LOW, because it would be set first to DR6_ACTIVE_LOW in svm_handle_exit and then set back to the guest value on the next entry.
Paolo
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