Re: [Xen-devel] Virtual Interrupt Delivery
> From: Konrad Rzeszutek Wilk [mailto:konrad.w...@oracle.com] > Sent: Thursday, March 02, 2017 4:36 AM > > On Mon, Feb 27, 2017 at 09:13:29PM +0300, Dmitry Rockosov wrote: > > Hi guys, > > > > Do you know when *recognized* Virtual Interrupt on VM-Entry will be > > delivered if Virtual-Interrupt Delivery is enabled and interrupt delivery > > is blocking by STI? > > This sounds like a good question to the Intel maintainers, CC-ing them. virtual interrupt delivery doesn't change the implication of blocking by STI. It will be evaluated and delivered when it's allowed. > > > > > Previously, VMM used Interrupt-Window, but as I see in XEN code, > > Interrupt-Window > > is not used when Virtual Interrupt Delivery is enabled. > > Right, the Intel SDM has a whole section about that. > > > > Does it mean, we will get Virtual Interrupt on the next VM-entry? > > By my understanding of the Intel SDM it depends on whether the > vector is one of those that the CPU can inject without involving > the VMM. > > I would recommend you read the Intel SDM - the answer may be right > there. yes SDM has a very clear description of when a virtual interrupt delivery will happen. check CH29.2 (Evaluation and Delivery of Virtual Interrupts). Thanks Kevin ___ Xen-devel mailing list Xen-devel@lists.xen.org https://lists.xen.org/xen-devel
Re: [Xen-devel] Virtual Interrupt Delivery
On Mon, Feb 27, 2017 at 09:13:29PM +0300, Dmitry Rockosov wrote: > Hi guys, > > Do you know when *recognized* Virtual Interrupt on VM-Entry will be > delivered if Virtual-Interrupt Delivery is enabled and interrupt delivery > is blocking by STI? This sounds like a good question to the Intel maintainers, CC-ing them. > > Previously, VMM used Interrupt-Window, but as I see in XEN code, > Interrupt-Window > is not used when Virtual Interrupt Delivery is enabled. Right, the Intel SDM has a whole section about that. > > Does it mean, we will get Virtual Interrupt on the next VM-entry? By my understanding of the Intel SDM it depends on whether the vector is one of those that the CPU can inject without involving the VMM. I would recommend you read the Intel SDM - the answer may be right there. ___ Xen-devel mailing list Xen-devel@lists.xen.org https://lists.xen.org/xen-devel
[Xen-devel] Virtual Interrupt Delivery
Hi guys, Do you know when *recognized* Virtual Interrupt on VM-Entry will be delivered if Virtual-Interrupt Delivery is enabled and interrupt delivery is blocking by STI? Previously, VMM used Interrupt-Window, but as I see in XEN code, Interrupt-Window is not used when Virtual Interrupt Delivery is enabled. Does it mean, we will get Virtual Interrupt on the next VM-entry? Thank you! Best Regards, Rockosov Dmitry ___ Xen-devel mailing list Xen-devel@lists.xen.org https://lists.xen.org/xen-devel
