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 1E5C32D592D; Thu, 7 May 2026 16:16:15 +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=1778170581; cv=none; b=OboY+FcFHX3o3ffSENCi8k7VM17l2AKyOpq08KEvxi6w/ZWW7pcuj+R5W/nV2y7KBrxVr9R6U2Hv+GVFfXdTowk+DDW9DxhbHnJqWuNEWSAYx3bsW9cY5zCj4zBiXCzt6K3rgSY+BQP4sGxd46dlRWUsp+3gF/DpRqbrrSPWI5Y= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778170581; c=relaxed/simple; bh=IamqkOQoiyqA0GmJEg9M9g+OSKJwZMy2KpqsKMvrZew=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=QuzO0xeLqWUmLudCDfq80z2lspffJZohxOnXbvWmVhJ3HAcBvHupTrmbC8B4WnokaSdm5xP3z0+VtNjFFhVC8XURnjfaUtKHFTyl6Fzp4z9KJHsuTw44YO1FYQIEqKYq86vDJ3/wI8qUuE57glzhzntFzEmfhlee+cQYKgexnWY= 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=pZfRiUZS; 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="pZfRiUZS" 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=WE4RckWX8OF480cYS9eU9WY3xvu7lpA6ffwrMs/Rq9c=; b=pZfRiUZSLDtKiPhW0E/q2CBHkT L8KK3j9UbnA+51yWhuLKAM/5gIkEtruXqsm/IcyImOM3g4siKUM7wNuXs12ZtEs6Bytp0l43zXzXL BKo2O33VXgtXkT6B2Nz8lRkrxzpLG/DJsgm7IN9mbc2BNow0r4qJJ5bklpAjFBaogNoWQdBhWAwql DXtuo1XSUX7WscGOJfcf45QJczSB+QNpNnoKd4DqeRMsBEu7tNSAaPm3opLZi2A8Li5gZU0T3rr7w E+BQRPJNgqNxXuskFl717k/e2VocIlQNja144msbQZabFhQiQNbG0HEUjczcD2J2Z/FBvVjiSUCDb zXeq6MBg==; Received: from [172.31.31.148] (helo=u09cd745991455d.ant.amazon.com) by desiato.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1wL1OJ-000000042fR-3ZeH; Thu, 07 May 2026 16:16:00 +0000 Message-ID: <9bc8666e63d7de8b32dd23934fe0097f98d72726.camel@infradead.org> Subject: Re: [PATCH] KVM: x86/xen: bail in IRQ context on PREEMPT_RT in kvm_xen_set_evtchn_fast() From: David Woodhouse To: Mauricio Faria de Oliveira Cc: Paul Durrant , Sean Christopherson , Paolo Bonzini , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Sebastian Andrzej Siewior , Clark Williams , Steven Rostedt , kernel-dev@igalia.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev, syzbot+208f7f3e5f59c11aeb90@syzkaller.appspotmail.com Date: Thu, 07 May 2026 17:15:59 +0100 In-Reply-To: <122adcacb2a6ccc3a5b78c750fe85e0b@igalia.com> References: <20260506-xen-rt-sleep-v1-1-53b6b60a671d@igalia.com> <8e7bc66a7994ca06f164a5d5f7ceb3f07d3a1357.camel@infradead.org> <876c720ab963f550d3166b067f6457fcd78ec415.camel@infradead.org> <122adcacb2a6ccc3a5b78c750fe85e0b@igalia.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-GPqvui8/ba7ix+o+xJOE" User-Agent: Evolution 3.52.3-0ubuntu1.1 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 --=-GPqvui8/ba7ix+o+xJOE Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2026-05-07 at 13:02 -0300, Mauricio Faria de Oliveira wrote: > On 2026-05-07 12:22, David Woodhouse wrote: > > On Thu, 2026-05-07 at 11:56 -0300, Mauricio Faria de Oliveira wrote: > > > On 2026-05-07 03:58, David Woodhouse wrote: > > > > On Wed, 2026-05-06 at 23:36 -0300, Mauricio Faria de Oliveira wrote= : > > > > > kvm_xen_set_evtchn_fast() calls read_lock_irqsave(), which might = block > > > > > on PREEMPT_RT, but that is invalid in IRQ context, as when it's c= alled > > > > > by xen_timer_callback() (even on PREEMPT_RT per HRTIMER_MODE_ABS_= HARD). > > > > >=20 > > > > > Check for that case, and bail out early. > > > > >=20 > > > > > Note: there is previous work and discussion on this [1] (~2 years= ago), > > > > > which involved continuing to execute the function with changes, b= ut it > > > > > was not merged. That was a different, more complex approach. > > > > >=20 > > > > > [1] https://lore.kernel.org/lkml/ZdPQVP7eejq3eFjc@google.com/ > > > >=20 > > > > ... > > > >=20 > > > > > + /* Bail in IRQ context on PREEMPT_RT; read_lock_irqsave() might= block */ > > > > > + if (IS_ENABLED(CONFIG_PREEMPT_RT) && in_hardirq()) > > > > > + goto out; > > > >=20 > > > >=20 > > > > The approach in Paul's earlier patch was better; we absolutely *wan= t* > > > > to deliver the interrupt to the guest immediately whenever we can, = and > > > > only fall back to the workqueue in the rare case that the shared in= fo > > > > page has been invalidated. > > >=20 > > > Certainly, that was better. This was a simple workaround, but with th= is > > > clarification, it indeed doesn't fit. > > >=20 > > > > We should switch to plain read_trylock(), *without* the > > > > local_irq_save(). And since this was the *only* case where the GPC = lock > > > > was ever taken under IRQ=C2=B9, all the GPC locking can drop the _i= rq part. > > >=20 > > > Ok, I can take a look. Or do you plan to work on it yourself (as you > > > hit the issue with read_unlock later in this thread)? > >=20 > > I'm working on it now; thanks. >=20 > Ok, thanks; I'll drop this. Could you please Cc me when you send it out? >=20 > > Currently confused by the fact that the read_trylock() seems to fail > > more often than it should under RT, causing the fallback path to be > > taken... and the fallback path doesn't seem to work properly... > >=20 > > Your version should have seen this too, surely? Did the selftest in > > linux/tools/testing/selftests/kvm/x86/xen_shinfo_test work with your > > patch? >=20 > Yes, it works, apparently. Timing is similar with/without PREEMPT_RT. Huh. Something weird going on for me. Would you mind confirming it still works with my version: https://git.infradead.org/?p=3Dusers/dwmw2/linux.git;a=3Dshortlog;h=3Drefs/= heads/gpc-stealtime --=-GPqvui8/ba7ix+o+xJOE 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 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