Re: [Xen-devel] Hypercalls in Intel-VT

["Ashish Bijlani" <ashish.bijlani@xxxxxxxxx>]

if I push xen's some addr (cs & eip) on the target guest os krnl stack when an interrupt occurs, would the guest os krnl return to xen immediately upon executing iret (as iret pops cs, eip from the krnl stack)? or would it make a vmexit coz of some illegal addr access

On 10/25/07, Cui, Dexuan <dexuan.cui@xxxxxxxxx > wrote:

HVM's hypercalls are implemented by VMCALL(a VMX instruction).

 

When HVM guest executes VMCALL, a EXIT_REASON_VMCALL VMexit occurs -- see xen/arch/x86/hvm/vmx/vmx.c: vmx_vmexit_handler() -> hvm_do_hypercall().

 

-- Dexuan

---

From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Ashish Bijlani
Sent: 2007年10月26日 7:04
To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] Hypercalls in Intel-VT

folks,

how are hypercalls made in intel-vt? do they cause any vmenter/vmexit? thanks.

-a

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