The INVPCID enabling test assumes cr3[11:0] is 0. But at present PCID
enabling test sets cr3[11:0] to 1 for its own purpose and doesn't restore the
register, which leads to a failure when INVPCID test tries to enable PCIDE.
This patch restores cr3 after PCID enabling test is done so that PCIDE can
Checks and operations on the INVPCID feature bit should use EBX of CPUID leaf 7
instead of ECX.
Signed-off-by: Junjie Mao
---
arch/x86/kvm/vmx.c |4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index c00f03d..002b4a5 100644
--- a
The INVPCID enabling test assumes cr3[11:0] is 0. But at present PCID enabling
test sets cr3[11:0] to 1 for its own purpose and doesn't restore the register,
which leads to a failure when INVPCID test tries to enable PCIDE.
This patch restores cr3 after PCID enabling test is done so that PCIDE can
This patch makes Qemu recognize the PCID feature specified from configuration
or command line options.
Signed-off-by: Junjie Mao
---
target-i386/cpu.c |2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/target-i386/cpu.c b/target-i386/cpu.c index 5521709..efc6ece
100644
--
Hi, Avi
Any comments on this patch? :)
> -Original Message-
> From: kvm-ow...@vger.kernel.org [mailto:kvm-ow...@vger.kernel.org] On
> Behalf Of Mao, Junjie
> Sent: Friday, July 13, 2012 12:58 PM
> To: 'kvm@vger.kernel.org'
> Subject: [PATCH] qemu kvm: Reco
This patch makes Qemu recognize the PCID feature specified from configuration
or command line options.
Signed-off-by: Junjie Mao
---
target-i386/cpu.c |2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index 5521709..efc6ece 100644
--
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 information when software switches to a different linear
address space. Refer
> -Original Message-
> From: Avi Kivity [mailto:a...@redhat.com]
> Sent: Friday, June 29, 2012 10:52 PM
> To: Mao, Junjie
> Cc: 'kvm@vger.kernel.org'
> Subject: Re: [PATCH v4] KVM: x86: Implement PCID/INVPCID for guests with
> EPT
>
> On 0
> -Original Message-
> From: Avi Kivity [mailto:a...@redhat.com]
> Sent: Thursday, June 28, 2012 11:49 PM
> To: Mao, Junjie
> Cc: 'kvm@vger.kernel.org'
> Subject: Re: [PATCH v4] KVM: x86: Implement PCID/INVPCID for guests with
> EPT
>
> On 06/14/2012
Hi, Avi
Any comments for the patch?
Best Regards
Junjie Mao
> -Original Message-
> From: Marcelo Tosatti [mailto:mtosa...@redhat.com]
> Sent: Saturday, June 16, 2012 10:32 AM
> To: Mao, Junjie
> Cc: 'kvm@vger.kernel.org'; Avi Kivity
> Subject: Re: [PATCH
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 information when software switches to a different linear
address space. Refer
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
> >
> > 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
> > > @@
> > > > -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
> -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
Add unit test for basic functionality of PCID/INVPCID feature exposing in kvm.
Changes from v1:
Hard code 'invpcid' instruction
Signed-off-by: Junjie Mao
---
config-x86-common.mak |2 +
config-x86_64.mak |3 +-
x86/README|1 +
x86/pcid.c| 185 +++
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 information when software switches to a different linear
address space. Refer
> -Original Message-
> From: kvm-ow...@vger.kernel.org [mailto:kvm-ow...@vger.kernel.org] On
> Behalf Of Mao, Junjie
> Sent: Thursday, May 17, 2012 9:22 AM
> To: Marcelo Tosatti
> Cc: 'kvm@vger.kernel.org'
> Subject: RE: [PATCH v2] KVM: x86: Implement PCI
> -Original Message-
> From: Marcelo Tosatti [mailto:mtosa...@redhat.com]
> Sent: Tuesday, May 15, 2012 10:42 AM
> To: Mao, Junjie
> Cc: 'kvm@vger.kernel.org'
> Subject: Re: [PATCH v2] KVM: x86: Implement PCID/INVPCID for guests with
> EPT
>
> On Mon,
> -Original Message-
> From: Marcelo Tosatti [mailto:mtosa...@redhat.com]
> Sent: Tuesday, May 15, 2012 10:20 AM
> To: Mao, Junjie
> Cc: Eric Northup; kvm@vger.kernel.org
> Subject: Re: [PATCH] KVM: x86: Implement PCID/INVPCID for guests with EPT
>
> On Mon, Ma
Best Regards
Junjie Mao
> -Original Message-
> From: Avi Kivity [mailto:a...@redhat.com]
> Sent: Sunday, May 13, 2012 6:03 PM
> To: Mao, Junjie
> Cc: 'kvm@vger.kernel.org'
> Subject: Re: [PATCH] KVM: x86: Implement PCID/INVPCID for guests with EPT
>
> On Wed, May 9, 2012 at 5:32 PM, 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
> >
Add unit test for basic functionality of PCID/INVPCID feature exposing in kvm.
Signed-off-by: Junjie Mao
---
config-x86-common.mak |2 +
config-x86_64.mak |3 +-
x86/README|1 +
x86/pcid.c| 185 +
x86/unitte
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 information when software switches to a different linear
address space. Refer
> On 05/10/2012 03:32 AM, 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
&
This patch makes Qemu accept the PCID feature specified from configuration or
command line options.
Signed-off-by: Mao, Junjie
---
target-i386/cpuid.c |2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/target-i386/cpuid.c b/target-i386/cpuid.c
index b9bfeaf..bc061b0
. Refer to section 4.10.1 in IA32 Intel Software
Developer's Manual Volume 3A for details.
For guests with EPT, the PCID feature is enabled and INVPCID behaves as running
natively.
For guests without EPT, the PCID feature is disabled and INVPCID triggers #UD.
Signed-off-by: Mao, Junjie
---
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