From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (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 7BADD3148A1; Wed, 10 Sep 2025 09:39:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757497151; cv=none; b=n54zh7S1lliFpKpw+F0Q4xqz8zSScZcpg5TKszAqkAQ3Uad2Po9H5vkCamNygiT1NWwqzYHmdAhkWb6vh7QQKonp2S6aQ4FfJuOtrvKagPVQPqF4oSoLU32kZnT+LHy6vZQm1/qLaeje8ejLI3XiDb3B4FwGnq3wAs9tFUqno74= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757497151; c=relaxed/simple; bh=F0hzqbKYzZ1FOBOhCdSWYTUeBbEmjSoAQE0V6lQDKVM=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=HCm/eoyDR4eEKY9XszuP3A+CtaLDfZrK1DruC5c8LZZ7b0zj/SsM8Ql2YcD/SOlNuA/Hl5XPJq8NrxDhzElfnPKXmuc8pszICjgvEkLs6cv2uO3GYqbsPmEnHqwRPwWmxCkkMuOlVg86LE4Mq8R0QO7ve6rm8auRFQxq+OwsgLE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=casper.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=l+/n/fc1; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=casper.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="l+/n/fc1" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; 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=F0hzqbKYzZ1FOBOhCdSWYTUeBbEmjSoAQE0V6lQDKVM=; b=l+/n/fc1OUqigTJV5jGZqICZtN 1nFwm6G2DY+wZrFrryg/zO6gh1kGp/C9eTqVZ+dYldOwi65SmXMEqxHEx3zKaByDKe2jIhhapyTEr M+H60u9TxZiLucwJw5ub6Brpw1WHig9VD/ea8i44ZfCDd63Sfw1/46bQP/FAkF6ZfIrnhBo0EJqll IgWXCeTaCeyQ7JD2VcNMw3yNgeu/F+JdgCexLGqj+Ux6HqCqYBJHqUV9vEM3ijcpBQpUTmwTu6Mfm 05TdwB3dwHPf77eHQaIbYUEOk4fy+BeDugvmI0EPYg2hBWHa0ZOtV18FlDUUg2SdD2UCdl9RDzwh6 Gouy/W6Q==; Received: from 54-240-197-236.amazon.com ([54.240.197.236] helo=freeip.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1uwHI9-00000006aCB-00j2; Wed, 10 Sep 2025 09:39:05 +0000 Message-ID: Subject: Re: [BUG] [KVM/VMX] Level triggered interrupts mishandled on Windows w/ nested virt(Credential Guard) when using split irqchip From: David Woodhouse To: Vitaly Kuznetsov , Khushit Shah Cc: "seanjc@google.com" , "pbonzini@redhat.com" , "kvm@vger.kernel.org" , "linux-kernel@vger.kernel.org" , Shaju Abraham Date: Wed, 10 Sep 2025 10:39:03 +0100 In-Reply-To: <87ms72g0zk.fsf@redhat.com> References: <7D497EF1-607D-4D37-98E7-DAF95F099342@nutanix.com> <87a535fh5g.fsf@redhat.com> <87wm69dvbu.fsf@redhat.com> <376ABCC7-CF9A-4E29-9CC7-0E3BEE082119@nutanix.com> <87ms72g0zk.fsf@redhat.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-m42kkFnwE69/VuJqghtc" 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 casper.infradead.org. See http://www.infradead.org/rpr.html --=-m42kkFnwE69/VuJqghtc Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2025-09-10 at 10:34 +0200, Vitaly Kuznetsov wrote: > Khushit Shah writes: >=20 > > > On 8 Sep 2025, at 5:12=E2=80=AFPM, Vitaly Kuznetsov wrote: > > >=20 >=20 > ... >=20 > > > Also, I've just recalled I fixed (well, 'workarounded') an issue > > > similar > > > to yours a while ago in QEMU: > > >=20 > > > commit 958a01dab8e02fc49f4fd619fad8c82a1108afdb > > > Author: Vitaly Kuznetsov > > > Date:=C2=A0=C2=A0 Tue Apr 2 10:02:15 2019 +0200 > > >=20 > > > =C2=A0=C2=A0 ioapic: allow buggy guests mishandling level-triggered > > > interrupts to make progress > > >=20 > > > maybe something has changed and it doesn't work anymore? > >=20 > > This is really interesting, we are facing a very similar issue, but > > the interrupt storm only occurs when using split-irqchip.=20 > > Using kernel-irqchip, we do not even see consecutive level > > triggered interrupts of the same vector. From the logs it is=20 > > clear that somehow with kernel-irqchip, L1 passes the interrupt to > > L2 to service, but with split-irqchip, L1 EOI=E2=80=99s without=20 > > servicing the interrupt. As it is working properly on kernel- > > irqchip, we can=E2=80=99t really point it as an Hyper-V issue. AFAIK,= =20 > > kernel-irqchip setting should be transparent to the guest, can you > > think of anything that can change this? >=20 > The problem I've fixed back then was also only visible with split > irqchip. The reason was: >=20 > """ > in-kernel IOAPIC implementation has commit 184564efae4d ("kvm: > ioapic: conditionally delay > irq delivery duringeoi broadcast") > """ >=20 > so even though the guest cannot really distinguish between in-kernel > and > split irqchips, the small differences in implementation can make a > big > difference in the observed behavior. In case we re-assert improperly > handled level-triggered interrupt too fast, the guest is not able to > make much progress but if we let it execute for even the tiniest > fraction of time, then the forward progress happens.=20 >=20 > I don't exactly know what happens in this particular case but I'd > suggest you try to atrificially delay re-asserting level triggered > interrupts and see what happens. We know that QEMU reasserts INTx interrupts too soon anyway. The in-kernel irqchip will trigger the VFIO resamplefd when the interrupt is EOI'd in the I/O APIC. as $DEITY intended. QEMU, on the other hand, will unmap the device BARs when the interrupt happens and intercept subsequent access, triggering the VFIO resamplefd as soon as the next access happens =E2=80=94 even before it's EOI'd. Could that be making a difference here? I guess, in theory, "too soon" probably shouldn't matter if it's all handled correctly elsewhere =E2=80=94 it should get masked again in the hardware and the pending status tracked correctly until it's redelivered to the guest(s). But it's probably worth testing, given that's one of the big behavioural differences between kernel and userspace I/O APIC? It's somewhat non-trivial to fix it 'properly' across all of QEMU's interrupt controllers and IRQ abstractions, but hacking something up which does the right thing just for this x86 platform and I/O APIC and avoids the current MMIO-unmapping abomination might be worth a test? --=-m42kkFnwE69/VuJqghtc 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 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