Messages in this thread | | | Date | Mon, 25 Jan 2016 15:05:53 +0100 | From | Radim Krcmár <> | Subject | Re: [PATCH v3 1/4] KVM: Recover IRTE to remapped mode if the interrupt is not single-destination |
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2016-01-25 12:26+0000, Wu, Feng: >> From: Paolo Bonzini [mailto:paolo.bonzini@gmail.com] On Behalf Of Paolo >> It may be necessary because IRTE writes (128 bits) are not atomic. > > IRTE is updated atomically, I added the patch to support this. Please > refer to 344cb4e0b6f3a0dbef0643eacb4946338eb228c0.
I also think that SN bit is not affected by atomicity: if the IRTE could have been read half-updated while changing from posted to non-posted, then it wouldn't point to the correct PID, because its address is not within 64 bits, so the SN bit wouldn't matter.
IRTE invalidation seems important in VT-d ...
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