From: Jim Mattson <jmattson@google.com>
To: Chenyi Qiang <chenyi.qiang@intel.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
Sean Christopherson <sean.j.christopherson@intel.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: Thu, 13 Aug 2020 10:52:11 -0700 [thread overview]
Message-ID: <CALMp9eQ5HhhXaEVKwnn6N6xxd2QOkNkE7ysiwq+3P=HB-Y1uzg@mail.gmail.com> (raw)
In-Reply-To: <1481a482-c20b-5531-736c-de0c5d3d611c@intel.com>
On Wed, Aug 12, 2020 at 9:54 PM Chenyi Qiang <chenyi.qiang@intel.com> wrote:
>
>
>
> On 8/11/2020 8:05 AM, 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>
> >> ---
> >> + (!vmx->nested.nested_run_pending ||
> >> + !(vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_PKRS)))
> >> + vmcs_write64(GUEST_IA32_PKRS, vmx->nested.vmcs01_guest_pkrs);
> >
> > This doesn't seem right to me. On the target of a live migration, with
> > L2 active at the time the snapshot was taken (i.e.,
> > vmx->nested.nested_run_pending=0), it looks like we're going to try to
> > overwrite the current L2 PKRS value with L1's PKRS value (except that
> > in this situation, vmx->nested.vmcs01_guest_pkrs should actually be
> > 0). Am I missing something?
> >
>
> We overwrite the L2 PKRS with L1's value when L2 doesn't support PKS.
> Because the L1's VM_ENTRY_LOAD_IA32_PKRS is off, we need to migrate L1's
> PKRS to L2.
I'm thinking of the case where vmx->nested.nested_run_pending is
false, and we are processing a KVM_SET_NESTED_STATE ioctl, yet
VM_ENTRY_LOAD_IA32_PKRS *is* set in the vmcs12.
next prev parent reply other threads:[~2020-08-13 17:52 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
2020-08-13 4:52 ` Chenyi Qiang
2020-08-13 17:52 ` Jim Mattson [this message]
2020-08-14 10:07 ` Chenyi Qiang
2020-08-14 17:34 ` Jim Mattson
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