From: Paolo Bonzini <pbonzini@redhat.com>
To: Sean Christopherson <seanjc@google.com>
Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
stable@vger.kernel.org
Subject: Re: [PATCH] KVM: x86: allow KVM_REQ_GET_NESTED_STATE_PAGES outside guest mode for VMX
Date: Mon, 25 Jan 2021 20:35:08 +0100 [thread overview]
Message-ID: <0b90c11b-0dce-60f3-c98d-3441b418e771@redhat.com> (raw)
In-Reply-To: <YA8ZHrh9ca0lPJgk@google.com>
On 25/01/21 20:16, Sean Christopherson wrote:
>> }
>>
>> +static bool vmx_get_nested_state_pages(struct kvm_vcpu *vcpu)
>> +{
>> + if (!nested_get_evmcs_page(vcpu))
>> + return false;
>> +
>> + if (is_guest_mode(vcpu) && !nested_get_vmcs12_pages(vcpu))
>> + return false;
> nested_get_evmcs_page() will get called twice in the common case of
> is_guest_mode() == true. I can't tell if that will ever be fatal, but it's
> definitely weird. Maybe this?
>
> if (!is_guest_mode(vcpu))
> return nested_get_evmcs_page(vcpu);
>
> return nested_get_vmcs12_pages(vcpu);
>
I wouldn't say there is a common case; however the idea was to remove
the call to nested_get_evmcs_page from nested_get_vmcs12_pages, since
that one is only needed after KVM_GET_NESTED_STATE and not during
VMLAUNCH/VMRESUME.
Paolo
next prev parent reply other threads:[~2021-01-25 19:51 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-25 17:20 [PATCH] KVM: x86: allow KVM_REQ_GET_NESTED_STATE_PAGES outside guest mode for VMX Paolo Bonzini
2021-01-25 19:16 ` Sean Christopherson
2021-01-25 19:35 ` Paolo Bonzini [this message]
2021-01-25 19:53 ` Sean Christopherson
2021-01-25 21:59 ` Paolo Bonzini
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