From: Jim Mattson <jmattson@google.com>
To: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: Chenyi Qiang <chenyi.qiang@intel.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Joerg Roedel <joro@8bytes.org>, Xiaoyao Li <xiaoyao.li@intel.com>,
kvm list <kvm@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [RFC 7/7] KVM: VMX: Enable PKS for nested VM
Date: Wed, 12 Aug 2020 11:32:38 -0700 [thread overview]
Message-ID: <CALMp9eTTZz+Wm-5onY2CF6VGHwtbaYtD9RZLyHZTUM2R4E6vbA@mail.gmail.com> (raw)
In-Reply-To: <20200812150017.GB6602@linux.intel.com>
On Wed, Aug 12, 2020 at 8:00 AM Sean Christopherson
<sean.j.christopherson@intel.com> wrote:
>
> On Mon, Aug 10, 2020 at 05:05:36PM -0700, Jim Mattson wrote:
> > On Fri, Aug 7, 2020 at 1:47 AM Chenyi Qiang <chenyi.qiang@intel.com> wrote:
> > >
> > > PKS MSR passes through guest directly. Configure the MSR to match the
> > > L0/L1 settings so that nested VM runs PKS properly.
> > >
> > > Signed-off-by: Chenyi Qiang <chenyi.qiang@intel.com>
> > > ---
> > > arch/x86/kvm/vmx/nested.c | 32 ++++++++++++++++++++++++++++++++
> > > arch/x86/kvm/vmx/vmcs12.c | 2 ++
> > > arch/x86/kvm/vmx/vmcs12.h | 6 +++++-
> > > arch/x86/kvm/vmx/vmx.c | 10 ++++++++++
> > > arch/x86/kvm/vmx/vmx.h | 1 +
> > > 5 files changed, 50 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
> > > index df2c2e733549..1f9823d21ecd 100644
> > > --- a/arch/x86/kvm/vmx/nested.c
> > > +++ b/arch/x86/kvm/vmx/nested.c
> > > @@ -647,6 +647,12 @@ static inline bool nested_vmx_prepare_msr_bitmap(struct kvm_vcpu *vcpu,
> > > MSR_IA32_PRED_CMD,
> > > MSR_TYPE_W);
> > >
> > > + if (!msr_write_intercepted_l01(vcpu, MSR_IA32_PKRS))
> > > + nested_vmx_disable_intercept_for_msr(
> > > + msr_bitmap_l1, msr_bitmap_l0,
> > > + MSR_IA32_PKRS,
> > > + MSR_TYPE_R | MSR_TYPE_W);
> >
> > What if L1 intercepts only *reads* of MSR_IA32_PKRS?
>
> nested_vmx_disable_intercept_for_msr() handles merging L1's desires, the
> (MSR_TYPE_R | MSR_TYPE_W) param is effectively L0's desire for L2.
I should know better than to assume that a function in kvm actually
does anything like what its name implies, but I never seem to learn.
:-(
Thanks!
next prev parent reply other threads:[~2020-08-12 18:32 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-07 8:48 [RFC 0/7] KVM: PKS Virtualization support Chenyi Qiang
2020-08-07 8:48 ` [RFC 1/7] KVM: VMX: Introduce PKS VMCS fields Chenyi Qiang
2020-08-10 23:17 ` Jim Mattson
2020-08-07 8:48 ` [RFC 2/7] KVM: VMX: Expose IA32_PKRS MSR Chenyi Qiang
2020-08-12 21:21 ` Jim Mattson
2020-08-13 5:42 ` Chenyi Qiang
2020-08-13 17:31 ` Jim Mattson
2020-08-18 7:27 ` Chenyi Qiang
2020-08-18 18:23 ` Jim Mattson
2020-08-22 3:28 ` Sean Christopherson
2021-01-26 18:01 ` Paolo Bonzini
2021-01-27 7:55 ` Chenyi Qiang
2021-02-01 9:53 ` Chenyi Qiang
2021-02-01 10:05 ` Paolo Bonzini
2020-08-07 8:48 ` [RFC 3/7] KVM: MMU: Rename the pkru to pkr Chenyi Qiang
2021-01-26 18:16 ` Paolo Bonzini
2020-08-07 8:48 ` [RFC 4/7] KVM: MMU: Refactor pkr_mask to cache condition Chenyi Qiang
2021-01-26 18:16 ` Paolo Bonzini
2021-01-27 3:14 ` Chenyi Qiang
2020-08-07 8:48 ` [RFC 5/7] KVM: MMU: Add support for PKS emulation Chenyi Qiang
2021-01-26 18:23 ` Paolo Bonzini
2021-01-27 3:00 ` Chenyi Qiang
2021-01-27 8:37 ` Paolo Bonzini
2020-08-07 8:48 ` [RFC 6/7] KVM: X86: Expose PKS to guest and userspace Chenyi Qiang
2020-08-13 19:04 ` Jim Mattson
2020-08-14 2:33 ` Chenyi Qiang
2020-09-30 4:36 ` Sean Christopherson
2021-01-26 18:24 ` Paolo Bonzini
2021-01-26 19:56 ` Sean Christopherson
2021-01-26 20:05 ` Paolo Bonzini
2020-08-07 8:48 ` [RFC 7/7] KVM: VMX: Enable PKS for nested VM Chenyi Qiang
2020-08-11 0:05 ` Jim Mattson
2020-08-12 15:00 ` Sean Christopherson
2020-08-12 18:32 ` Jim Mattson [this message]
2020-08-13 4:52 ` Chenyi Qiang
2020-08-13 17:52 ` Jim Mattson
2020-08-14 10:07 ` Chenyi Qiang
2020-08-14 17:34 ` Jim Mattson
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