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Message-ID: <aG52wupjDpEMChr7@google.com>
Date: Wed, 9 Jul 2025 07:03:46 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Neeraj Upadhyay <Neeraj.Upadhyay@....com>
Cc: linux-kernel@...r.kernel.org, bp@...en8.de, tglx@...utronix.de,
mingo@...hat.com, dave.hansen@...ux.intel.com, Thomas.Lendacky@....com,
nikunj@....com, Santosh.Shukla@....com, Vasant.Hegde@....com,
Suravee.Suthikulpanit@....com, David.Kaplan@....com, x86@...nel.org,
hpa@...or.com, peterz@...radead.org, pbonzini@...hat.com, kvm@...r.kernel.org,
kirill.shutemov@...ux.intel.com, huibo.wang@....com, naveen.rao@....com,
kai.huang@...el.com
Subject: Re: [RFC PATCH v8 01/35] KVM: x86: Open code setting/clearing of bits
in the ISR
On Wed, Jul 09, 2025, Neeraj Upadhyay wrote:
> Remove __apic_test_and_set_vector() and __apic_test_and_clear_vector(),
> because the _only_ register that's safe to modify with a non-atomic
> operation is ISR, because KVM isn't running the vCPU, i.e. hardware can't
> service an IRQ or process an EOI for the relevant (virtual) APIC.
>
> No functional change intended.
>
> Suggested-by: Sean Christopherson <seanjc@...gle.com>
> Signed-off-by: Neeraj Upadhyay <Neeraj.Upadhyay@....com>
> ---
Acked-by: Sean Christopherson <seanjc@...gle.com>
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