For HVM guest, i.e., VMX guest, the execution of IRET is similar to that on
native system, but of course there are important differences :) -- you should
read the related chapters (i.e., “event injection”) in Intel Software
Developer’s Manual 3B, and you should also look at the Xen code (i.e., the
vioapic.c, vlapic.c, vmx/vmx.c, vmx/intr.c in the directory xen/arch/x86/hvm/).
Note: HVM guest doesn’t touch physical interrupt (and the physical pic/ioapic
/local_apic) --here we don’t consider VT-d;
Xen only “injects” *virtual* interrupts into HVM guest with the help of the
emulation of Device Model.
When HVM vcpu is running, if a physical interrupt happens, a VMExit will occur
to interrupt the execution of the HVM vcpu, then Xen handles the physical
interrupt.
-- Dexuan
________________________________
From: xen-devel-bounces@lists.xensource.com
[mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of Ashish Bijlani
Sent: 2007年10月21日 4:21
To: Xen-devel@lists.xensource.com
Subject: [Xen-devel] hvm iret
could anybody guide me to some pointers on iret execution by hvms. something
like what happens when a HVM executes an iret instruction? when is the physical
interrupt acknowledged so that IOAPIC can send more interrupts. thanks.
-a
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