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From: David Matlack <dmatlack@google.com>
To: Vishal Annapurve <vannapurve@google.com>
Cc: x86@kernel.org, kvm@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org,
	pbonzini@redhat.com, shuah@kernel.org, bgardon@google.com,
	seanjc@google.com, oupton@google.com, peterx@redhat.com,
	vkuznets@redhat.com
Subject: Re: [V2 PATCH 4/8] KVM: selftests: x86: Precompute the result for is_{intel,amd}_cpu()
Date: Wed, 21 Sep 2022 14:39:19 -0700	[thread overview]
Message-ID: <YyuEhxW4URWVvHyW@google.com> (raw)
In-Reply-To: <20220915000448.1674802-5-vannapurve@google.com>

On Thu, Sep 15, 2022 at 12:04:44AM +0000, Vishal Annapurve wrote:
> Cache the vendor CPU type in a global variable so that multiple calls
> to is_intel_cpu() do not need to re-execute CPUID.
> 
> Add cpu vendor check in kvm_hypercall() so that it executes correct
> vmcall/vmmcall instruction when running on Intel/AMD hosts. This avoids
> exit to KVM which anyway tries to patch the instruction according to
> the cpu type.

Out of curiousity, why do we want to avoid this exit?

  parent reply	other threads:[~2022-09-21 21:39 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-15  0:04 [V2 PATCH 0/8] Execute hypercalls from guests according to cpu type Vishal Annapurve
2022-09-15  0:04 ` [V2 PATCH 1/8] KVM: selftests: move common startup logic to kvm_util.c Vishal Annapurve
2022-09-15  9:45   ` Andrew Jones
2022-09-15  0:04 ` [V2 PATCH 2/8] KVM: selftests: Add arch specific initialization Vishal Annapurve
2022-09-15  9:44   ` Andrew Jones
2022-09-26 23:18     ` Vishal Annapurve
2022-09-21 20:50   ` David Matlack
2022-09-26 23:18     ` Vishal Annapurve
2022-09-15  0:04 ` [V2 PATCH 3/8] KVM: selftests: Add arch specific post vm load setup Vishal Annapurve
2022-09-21 20:54   ` David Matlack
2022-09-26 23:18     ` Vishal Annapurve
2022-10-03 15:42       ` Sean Christopherson
2022-10-04  0:02         ` Vishal Annapurve
2022-10-04 20:10           ` Sean Christopherson
2022-10-13 11:36             ` Vishal Annapurve
2022-09-15  0:04 ` [V2 PATCH 4/8] KVM: selftests: x86: Precompute the result for is_{intel,amd}_cpu() Vishal Annapurve
2022-09-21 21:19   ` David Matlack
2022-09-26 23:27     ` Vishal Annapurve
2022-09-26 23:34       ` David Matlack
2022-09-26 23:40         ` Vishal Annapurve
2022-09-21 21:39   ` David Matlack [this message]
2022-09-26 23:48     ` Vishal Annapurve
2022-09-26 23:53       ` David Matlack
2022-09-15  0:04 ` [V2 PATCH 5/8] KVM: selftests: x86: delete svm_vmcall_test Vishal Annapurve
2022-09-21 21:34   ` David Matlack
2022-09-26 23:32     ` Vishal Annapurve
2022-09-15  0:04 ` [V2 PATCH 6/8] KVM: selftests: x86: Execute cpu specific hypercall from nested guests Vishal Annapurve
2022-09-15  0:04 ` [V2 PATCH 7/8] Kvm: selftests: x86: Execute cpu specific vmcall instruction Vishal Annapurve
2022-09-21 21:43   ` David Matlack
2022-09-26 23:35     ` Vishal Annapurve
2022-09-15  0:04 ` [V2 PATCH 8/8] KVM: selftests: x86: xen: " Vishal Annapurve
2022-09-21 21:47   ` David Matlack
2022-09-26 23:37     ` Vishal Annapurve

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