Re: [Xen-devel] [PATCH v4 4/6] VMX: Make sure PI is in proper state before install the hooks

> -Original Message- > From: Jan Beulich [mailto:jbeul...@suse.com] > Sent: Monday, September 26, 2016 8:46 PM > To: Wu, Feng > Cc: andrew.coop...@citrix.com; dario.faggi...@citrix.com; > george.dun...@eu.citrix.com; Tian, Kevin ; xen- >

Re: [Xen-devel] [PATCH v4 4/6] VMX: Make sure PI is in proper state before install the hooks

>>> On 21.09.16 at 04:37, wrote: > We may hit the ASSERT() in vmx_vcpu_block in the current code, There are three of them - please be explicit which one is what gets dealt with here. > --- a/xen/arch/x86/hvm/vmx/vmcs.c > +++ b/xen/arch/x86/hvm/vmx/vmcs.c > @@ -956,16 +956,13

[Xen-devel] [PATCH v4 4/6] VMX: Make sure PI is in proper state before install the hooks

We may hit the ASSERT() in vmx_vcpu_block in the current code, since vmx_vcpu_block() may get called before vmx_pi_switch_to() has been installed or executed. Here We use cmpxchg to update the NDST field, this can make sure we only update the NDST when vmx_pi_switch_to() has not been called. So