Terribly sorry for the late reply. I'm out of work for some unexpected issues
the last few weeks.
> >> > So i think that checking whether EPT _and_ VPID are supported
> >> > should be a precondition to enable PCID support for guests.
> >> >
> >>
> >> Should this check be carried out on L0 too? If
On 05/25/2012 03:59 AM, Marcelo Tosatti wrote:
>> >
>> > The problem with enabling PCID for the L2 guest is that it can share same
>> > PCID
>> > values with the L1 hypervisor.
>> >
>> > However, if the L1 hypervisor enables and configures VPID (given that
>> > the L0 hypervisor emulates and exp
On Wed, May 23, 2012 at 05:02:28AM +, Mao, Junjie wrote:
> > >
> > > The previous patch regards PCID and INVPCID as a whole because qemu
> > doesn't support cpuid leaf 7 configuration at present. This is not the case
> > in this
> > version.
> > > > The problem with cpu_has_hypervisor check is
> >
> > The previous patch regards PCID and INVPCID as a whole because qemu
> doesn't support cpuid leaf 7 configuration at present. This is not the case
> in this
> version.
> > > The problem with cpu_has_hypervisor check is that its Linux specific.
> > > Any solution should also take into accoun
On Tue, May 22, 2012 at 12:46:54AM +, Mao, Junjie wrote:
> > > > @@
> > > > > -1711,6 +1717,22 @@ static bool vmx_rdtscp_supported(void)
> > > > > return cpu_has_vmx_rdtscp();
> > > > > }
> > > > >
> > > > > +static bool vmx_pcid_supported(void) {
> > > > > + /*
> > > > > + * Th
> > > @@
> > > > -1711,6 +1717,22 @@ static bool vmx_rdtscp_supported(void)
> > > > return cpu_has_vmx_rdtscp();
> > > > }
> > > >
> > > > +static bool vmx_pcid_supported(void) {
> > > > + /*
> > > > +* This function is only for determining whether to expose PCID
> > > > bit
rg'
> > Subject: Re: [PATCH v3] KVM: x86: Implement PCID/INVPCID for guests with
> > EPT
> >
> > On Fri, May 18, 2012 at 06:17:05AM +, Mao, Junjie wrote:
> > > This patch handles PCID/INVPCID for guests.
> > >
> > > Process-context iden
> -Original Message-
> From: Marcelo Tosatti [mailto:mtosa...@redhat.com]
> Sent: Saturday, May 19, 2012 5:51 AM
> To: Mao, Junjie
> Cc: n...@math.technion.ac.il; 'kvm@vger.kernel.org'
> Subject: Re: [PATCH v3] KVM: x86: Implement PCID/INVPCID for guests wi
On Fri, May 18, 2012 at 06:17:05AM +, Mao, Junjie wrote:
> This patch handles PCID/INVPCID for guests.
>
> Process-context identifiers (PCIDs) are a facility by which a logical
> processor
> may cache information for multiple linear-address spaces so that the processor
> may retain cached inf
