From: Gal Pressman <gal@nvidia.com>
To: Naveen N Rao <naveen@kernel.org>
Cc: Sean Christopherson <seanjc@google.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Thomas Gleixner <tglx@kernel.org>, Ingo Molnar <mingo@redhat.com>,
Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
Dragos Tatulea <dtatulea@nvidia.com>
Subject: Re: [PATCH 1/2] KVM: SVM: Fix UBSAN warning when reading avic parameter
Date: Wed, 25 Feb 2026 08:48:14 +0200 [thread overview]
Message-ID: <26fa60bd-83a5-43cf-9630-71c3a3c85b00@nvidia.com> (raw)
In-Reply-To: <aZ6UJyaBr6XExhsv@blrnaveerao1>
On 25/02/2026 8:27, Naveen N Rao wrote:
> On Tue, Feb 24, 2026 at 11:18:01AM +0200, Gal Pressman wrote:
>> On 23/02/2026 18:38, Naveen N Rao wrote:
>>> On Tue, Feb 10, 2026 at 08:46:20AM +0200, Gal Pressman wrote:
>>>>
>>>> +static int avic_param_get(char *buffer, const struct kernel_param *kp)
>>>> +{
>>>> + int val = *(int *)kp->arg;
>>>> +
>>>> + if (val == AVIC_AUTO_MODE)
>>>> + return sysfs_emit(buffer, "auto\n");
>>>
>>> My preference would be to return 'N' here, so that this continues to
>>> return a boolean value when read.
>>
>> I guess the boolean conversion used to return 'Y' before this patch, why
>> is 'N' better?
>
> Because that would reflect the state of AVIC more accurately:
> - in the case of kvm-amd module still being loaded, AVIC has not yet
> been enabled, and
> - in the case of a non-AMD system, AVIC is not enabled and is not
> active.
>
> Also, note that AVIC used to default to 'N' until recently.
Will change in v2, thanks for the review.
next prev parent reply other threads:[~2026-02-25 6:48 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-10 6:46 [PATCH 0/2] KVM: x86: Fix UBSAN bool warnings in module parameters Gal Pressman
2026-02-10 6:46 ` [PATCH 1/2] KVM: SVM: Fix UBSAN warning when reading avic parameter Gal Pressman
2026-02-23 16:38 ` Naveen N Rao
2026-02-24 9:18 ` Gal Pressman
2026-02-25 6:27 ` Naveen N Rao
2026-02-25 6:48 ` Gal Pressman [this message]
2026-02-10 6:46 ` [PATCH 2/2] KVM: x86/mmu: Fix UBSAN warning when reading nx_huge_pages parameter Gal Pressman
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