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From: Jim Mattson <jmattson@google.com>
To: Krish Sadhukhan <krish.sadhukhan@oracle.com>
Cc: "kvm list" <kvm@vger.kernel.org>,
	"Paolo Bonzini" <pbonzini@redhat.com>,
	"Radim Krčmář" <rkrcmar@redhat.com>
Subject: Re: [PATCH 5/8][KVM nVMX]: Check "load IA32_PERF_GLOBAL_CTRL" VM-entry control on vmentry of nested guests
Date: Thu, 15 Aug 2019 15:36:28 -0700
Message-ID: <CALMp9eRK4+TKvQ2JN0_Dtm79d7b1bLKtPeu5D2GEisEZUVit1g@mail.gmail.com> (raw)
In-Reply-To: <20190424231724.2014-6-krish.sadhukhan@oracle.com>

On Wed, Apr 24, 2019 at 4:43 PM Krish Sadhukhan
<krish.sadhukhan@oracle.com> wrote:
>
> According to section "CHECKING AND LOADING GUEST STATE" in Intel SDM vol 3C,
> the following checks are performed on vmentry of nested guests:
>
>     "If the "load IA32_PERF_GLOBAL_CTRL" VM-entry control is 1, bits reserved
>     in the IA32_PERF_GLOBAL_CTRL MSR must be 0 in the field for that
>     register."
>
> Signed-off-by: Krish Sadhukhan <krish.sadhukhan@oracle.com>
> Reviewed-by: Karl Heubaum <karl.heubaum@oracle.com>
> ---
>  arch/x86/kvm/vmx/nested.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
> index d2067370e288..a7bf19eaa70b 100644
> --- a/arch/x86/kvm/vmx/nested.c
> +++ b/arch/x86/kvm/vmx/nested.c
> @@ -2691,6 +2691,10 @@ static int nested_vmx_check_vmentry_postreqs(struct kvm_vcpu *vcpu,
>                 return 1;
>         }
>
> +       if (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL &&
> +           !kvm_valid_perf_global_ctrl(vmcs12->guest_ia32_perf_global_ctrl))
> +               return 1;
> +

I'd rather see this built on an interface like:

bool kvm_valid_msr_value(u32 msr_index, u64 value);

But as long as we don't end up with a plethora of
kvm_valid_MSR_NAME(u64 value) functions, this looks fine.

Reviewed-by: Jim Mattson <jmattson@google.com>

  reply index

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-24 23:17 [KVM nVMX]: Check "load IA32_PERF_GLOBAL_CTRL" " Krish Sadhukhan
2019-04-24 23:17 ` [PATCH 1/8][KVMnVMX]: Enable "load IA32_PERF_GLOBAL_CTRL" VM-exit control for " Krish Sadhukhan
2019-05-13 18:49   ` Sean Christopherson
2019-05-13 22:08     ` Krish Sadhukhan
2019-04-24 23:17 ` [PATCH 2/8][KVM nVMX]: Enable "load IA32_PERF_GLOBAL_CTRL" VM-entry " Krish Sadhukhan
2019-05-13 18:49   ` Sean Christopherson
2019-04-24 23:17 ` [PATCH 3/8][KVM VMX]: Add a function to check reserved bits in MSR_CORE_PERF_GLOBAL_CTRL Krish Sadhukhan
2019-05-13 18:57   ` Sean Christopherson
2019-08-15 22:29     ` Jim Mattson
2019-04-24 23:17 ` [PATCH 4/8][KVM nVMX]: Check "load IA32_PERF_GLOBAL_CTRL" VM-exit control on vmentry of nested guests Krish Sadhukhan
2019-05-13 19:00   ` Sean Christopherson
2019-05-16 22:07     ` Krish Sadhukhan
2019-05-17 20:34       ` Sean Christopherson
2019-08-15 22:54         ` Jim Mattson
2019-04-24 23:17 ` [PATCH 5/8][KVM nVMX]: Check "load IA32_PERF_GLOBAL_CTRL" VM-entry " Krish Sadhukhan
2019-08-15 22:36   ` Jim Mattson [this message]
2019-04-24 23:17 ` [PATCH 6/8][KVM nVMX]: Load IA32_PERF_GLOBAL_CTRL MSR " Krish Sadhukhan
2019-08-15 22:44   ` Jim Mattson
2019-08-21 23:05     ` Krish Sadhukhan
2019-08-21 23:10       ` Jim Mattson
2019-08-23  5:29     ` Krish Sadhukhan
2019-08-23 15:57       ` Jim Mattson
2019-04-24 23:17 ` [PATCH 7/8][KVM nVMX]: Enable "load IA32_PERF_GLOBAL_CTRL VM-{entry,exit} controls Krish Sadhukhan
2019-05-13 19:12   ` Sean Christopherson
2019-08-15 23:02     ` Jim Mattson
2019-04-24 23:17 ` [PATCH 8/8][KVM nVMX]: Test "load IA32_PERF_GLOBAL_CTRL" controls on vmentry of nested guests Krish Sadhukhan
2019-05-13 18:46 ` [KVM nVMX]: Check "load IA32_PERF_GLOBAL_CTRL" " Sean Christopherson

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