linux-kernel - Re: [PATCH] KVM: x86: skip userspace IOAPIC EOI exit when Directed EOI is enabled

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Message-ID: <18B08EDA-7A16-4CF1-9E2F-79ADD46F8E4C@nutanix.com>
Date: Tue, 4 Nov 2025 05:08:05 +0000
From: Khushit Shah <khushit.shah@...anix.com>
To: Sean Christopherson <seanjc@...gle.com>
CC: Jon Kohler <jon@...anix.com>, Paolo Bonzini <pbonzini@...hat.com>,
        Thomas
 Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
        Borislav
 Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "x86@...nel.org" <x86@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] KVM: x86: skip userspace IOAPIC EOI exit when Directed
 EOI is enabled

Hi Sean,

Agreed. I was too focused on fixing this purely in KVM and didn’t account for userspace realities. The quirk plus x2APIC flag makes sense.

I’ll make qemu side changes, test it as a whole and report back with results.

Thanks,
Khushit