From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1F6503043C7; Tue, 2 Dec 2025 13:31:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.92.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764682287; cv=none; b=cf8kfaHHZWAMdJizGblxnjfHu/F55nGGyO/38x8JZXt4wmPi1gKeEWAI/7OfjMOjYnVFabAdApp3Sl2XGQ0zrz2CgDVjVtFGV0lLQ4F2vaI2nTX0M6cetXyR6Y/mYOkHIiexm6DI69TEUklP47A5j9wEnIms3fbeheSxd/0xmhU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764682287; c=relaxed/simple; bh=qrzLmvakwJ4FFKDJEn3ETecGWtxl/9hhsEead+JRBRw=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=tMdv4ACk97rmF7oW0Cz/rPcpYs09oPR+1WWhmpZ/BeoUb6DtSvXLr8GwhhuLAH1iGExTdrj9d2K5jStFs43LAl+lgVRwBHysjRpJv9oYZrchtiFrK4eVDopKJdy5dsT/4Kii7rP3lpPRAx5dyR6iqg1oHydSTvulW/HQo4u7vBg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=desiato.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=BZAMwu0s; arc=none smtp.client-ip=90.155.92.199 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=desiato.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="BZAMwu0s" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=qrzLmvakwJ4FFKDJEn3ETecGWtxl/9hhsEead+JRBRw=; b=BZAMwu0sMrPhxOzf3tIqtKvKYT uwReeV50GTd+LXNbTNzfT3EwkdwYGGYICh85nEOJMtMFonh8/oBqx9m60NV4m96zbFitPCMH+AVeT PqKCb2AJ8UrJ7CqSbF4afaJGSqhk4cysCrzOHAKtbbUEY5YXrkftjEHDBgAKilfeSKmQutanWpofF dMZ+HR3SEkmAPyo/4TvJOu9HkBMP34v2A0vq240uS/1KDIcsKY76M7OV+c2BUcn5tvs0uuTYY9rtf ODVcZwZbWBJ5Xs+dldmHDOCO4sZbjTVRtj+kagViRy/Puc8fjcNcoBfaaj1xXLWz3wnELu6dd2yfm IK5dg5uQ==; Received: from [172.31.31.148] (helo=u09cd745991455d.ant.amazon.com) by desiato.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1vQPbm-00000000OJs-2SNr; Tue, 02 Dec 2025 12:35:54 +0000 Message-ID: <118998075677b696104dcbbcda8d51ab7f1ffdfd.camel@infradead.org> Subject: Re: [PATCH v3] KVM: x86: Add x2APIC "features" to control EOI broadcast suppression From: David Woodhouse To: Khushit Shah Cc: "seanjc@google.com" , "pbonzini@redhat.com" , "kai.huang@intel.com" , "mingo@redhat.com" , "x86@kernel.org" , "bp@alien8.de" , "hpa@zytor.com" , "linux-kernel@vger.kernel.org" , "kvm@vger.kernel.org" , "dave.hansen@linux.intel.com" , "tglx@linutronix.de" , Jon Kohler , Shaju Abraham , "stable@vger.kernel.org" Date: Tue, 02 Dec 2025 13:31:14 +0000 In-Reply-To: References: <20251125180557.2022311-1-khushit.shah@nutanix.com> <6353f43f3493b436064068e6a7f55543a2cd7ae1.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-057aZcPxo3+YNW7kcDIV" User-Agent: Evolution 3.52.3-0ubuntu1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by desiato.infradead.org. See http://www.infradead.org/rpr.html --=-057aZcPxo3+YNW7kcDIV Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2025-12-02 at 12:58 +0000, Khushit Shah wrote: > Thanks for the review! >=20 > > On 2 Dec 2025, at 2:43=E2=80=AFPM, David Woodhouse wrote: > >=20 > > Firstly, excellent work debugging and diagnosing that! > >=20 > > On Tue, 2025-11-25 at 18:05 +0000, Khushit Shah wrote: > > >=20 > > > --- a/Documentation/virt/kvm/api.rst > > > +++ b/Documentation/virt/kvm/api.rst > > > @@ -7800,8 +7800,10 @@ Will return -EBUSY if a VCPU has already been = created. > > > =C2=A0 > > > =C2=A0Valid feature flags in args[0] are:: > > > =C2=A0 > > > -=C2=A0 #define KVM_X2APIC_API_USE_32BIT_IDS=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 (1ULL << 0) > > > -=C2=A0 #define KVM_X2APIC_API_DISABLE_BROADCAST_QUIRK=C2=A0 (1ULL <<= 1) > > > +=C2=A0 #define KVM_X2APIC_API_USE_32BIT_IDS=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0 (1ULL << 0) > > > +=C2=A0 #define KVM_X2APIC_API_DISABLE_BROADCAST_QUIRK=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 (1ULL << 1) > > > +=C2=A0 #define KVM_X2APIC_API_DISABLE_IGNORE_SUPPRESS_EOI_BROADCAST_= QUIRK (1ULL << 2) > > > +=C2=A0 #define KVM_X2APIC_API_DISABLE_SUPPRESS_EOI_BROADCAST=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 (1= ULL << 3) > > >=20 > >=20 > > I kind of hate these names. This part right here is what we leave > > behind for future generations, to understand the weird behaviour of > > KVM. To have "IGNORE" "SUPPRESS" "QUIRK" all in the same flag, quite > > apart from the length of the token, makes my brain hurt. >=20 > Yes, I agree the original name is too wordy. How about renaming it to > KVM_X2APIC_API_ACTUALLY_SUPPRESS_EOI_BROADCASTS? > That makes the intended KVM behaviour clear. > > I'm also not very keen on ENABLE_SUPPRESS_EOI_BROADCAST > it reads as if KVM is the one enabling the feature, which isn't the case. > The guest decides whether to enable suppression; KVM should just > advertise the capability correctly and then respect whatever the guest > chooses. I think _ENABLE_ for enabling a feature for the guest to optionally use is reasonable enough; we'd generally say '_FORCE_' if we were going to turn it on unconditionally without the guest's knowledge. Not entirely sure why you're OK with ACTUALLY_SUPPRESS_EOI_BROADCAST when you aren't ok with ENABLE_SUPPRESS_EOI_BROADCAST. In both cases you'd need to append _BUT_ONLY_IF_THE_GUEST_ASKS_FOR_IT if you want to be pedantic. :) --=-057aZcPxo3+YNW7kcDIV Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCD9Aw ggSOMIIDdqADAgECAhAOmiw0ECVD4cWj5DqVrT9PMA0GCSqGSIb3DQEBCwUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBDQTAeFw0yNDAxMzAwMDAwMDBaFw0zMTEx MDkyMzU5NTlaMEExCzAJBgNVBAYTAkFVMRAwDgYDVQQKEwdWZXJva2V5MSAwHgYDVQQDExdWZXJv a2V5IFNlY3VyZSBFbWFpbCBHMjCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMjvgLKj jfhCFqxYyRiW8g3cNFAvltDbK5AzcOaR7yVzVGadr4YcCVxjKrEJOgi7WEOH8rUgCNB5cTD8N/Et GfZI+LGqSv0YtNa54T9D1AWJy08ZKkWvfGGIXN9UFAPMJ6OLLH/UUEgFa+7KlrEvMUupDFGnnR06 aDJAwtycb8yXtILj+TvfhLFhafxroXrflspavejQkEiHjNjtHnwbZ+o43g0/yxjwnarGI3kgcak7 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