Messages in this thread | | | Subject | Re: [PART1 V5 08/13] svm: Add interrupt injection via AVIC | From | Suravee Suthikulpanit <> | Date | Tue, 31 May 2016 23:02:22 -0500 |
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Hi,
Sorry for late response on this.
On 5/10/16 09:50, Paolo Bonzini wrote: > > > On 10/05/2016 11:19, Borislav Petkov wrote: >>>> This patch introduces a new mechanism to inject interrupt using AVIC. >>>> Since VINTR is not supported when enable AVIC, we need to inject >> "... is not supported when AVIC is enabled ..." >> >> VINTR? > > The ability to request a vmexit as soon as an interrupt can be injected > (IF=GIF=1, no interrupt window, etc.). It's called the "VINTR intercept". > >> Please write those things out in the commit message for maximum >> information transfer to the reader. :) > > More important, where does the APM document that VINTR is not supported > when AVIC is enabled? It is certainly pointless and inefficient, but > I'm not sure where it says that it doesn't work. > > Paolo >
Basically, from the APM vol2 here:
http://developer.amd.com/wordpress/media/2012/10/24593_APM_v21.pdf
On page 115, section AVIC Enable—Virtual Interrupt Control, Bit 31:
"... Enabling AVIC implicitly disables the V_IRQ, V_INTR_PRIO, V_IGN_TPR, and V_INTR_VECTOR fields in the VMCB Control Word."
Thanks, Suravee
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