where the vcpu-s switching is happen

where the vcpu-s switching is happen

[xennn]

Hi all,

I wlould like to ask where is the code where the switching of vcpu-s on one
physical cpu is happening?

If i use x86 and vmx mode i think that the actual switch i happen in 
vmx_ctxt_switch_to(struct vcpu *v) at vmx.c file. 

I think the vmx_restore_guest_msrs(v) function is responsible for restoring
the registers of the guest and the RIP register - which is the real task
switching between vcpus. 

i'm not sure but i would like to ask where the RIP register is changed with
the new vcpu's instuction pointer?

as far as i know the RIP register is stored at VMCS controll stucture and it
is loaded when that structure become active ... 

plase help with some hints about this proccess.

Best Regards




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Re: where the vcpu-s switching is happen

[Ian Campbell]

On Sun, 2014-03-02 at 10:44 -0800, xennn wrote:
> 
> plase help with some hints about this proccess.

The generic code entry point to the context switch is in
xen/common/schedule.c:schedule which calls into arch specific
context_switch function e.g. xen/arch/x86/domain.c or
xen/arch/arm/domain.c.

Ian.

where the vcpu-s switching is happen

[xennn]

Hi all,

I wlould like to ask where is the code where the switching of vcpu-s on one
physical cpu is happening?

If i use x86 and vmx mode i think that the actual switch i happen in 
vmx_ctxt_switch_to(struct vcpu *v) at vmx.c file. 

I think the vmx_restore_guest_msrs(v) function is responsible for restoring
the registers of the guest and the RIP register - which is the real task
switching between vcpus. 

i'm not sure but i would like to ask where the RIP register is changed with
the new vcpu's instuction pointer?

as far as i know the RIP register is stored at VMCS controll stucture and it
is loaded when that structure become active ... 

plase help with some hints about this proccess.

Best Regards




--
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