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 E95D91E3CCB; Fri, 2 Aug 2024 12:57:08 +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=1722603430; cv=none; b=a+wOS/TtDq8bsXUtJUs9edlsPer72N0jRsG9zLsvKjsBhSkouFubKg0uZZrn/Byr5uaiS4TQkYYnIwwGrCANTzdmCsnIlTI5djKtlv9J4iF/M1dkUZSwMVo1sTo/HIqkAbXJsC4iEdWbykiO6dh1vvtZD/SyB+N9idca+J4AoE4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722603430; c=relaxed/simple; bh=G9IWJMc3Z25xogsluFuEXcYSFR4VFZFPkzNCyDNLzJ8=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=cjTGTC+wbDG09m/rHM+nG+pxnnhvwCriwp6J5krHX+Ye/GnvNKqHVASQVSOKvT6W4N9cg05zg5C8/wUzOHfOsSb5syt/c2quGKqXfqHJ1J/XJmp9BcZf7BpLFQ8+26cce8I0UMCnaka1G6gaObpdMK8NNVc16AcTwqgJvT6Rl0E= 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=Fd78y2E2; 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="Fd78y2E2" 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=G9IWJMc3Z25xogsluFuEXcYSFR4VFZFPkzNCyDNLzJ8=; b=Fd78y2E2HRLmygk4Cr5Cm3+bia YpgX+3sRenAq3HBT1cBrFMVFcA+2mez2jPE3Mx2Qw2Izgp8K1wxybQfJ1gbi6oykxEcVTRvP/LonD 7fBBc9x5ZyHOAWY/qutnjsW8Sf2PlQGN2fxCOedimZcOS0zqUA8PX2IIs1NbD3w1ilnHrsVk7jsLk eC6vAFfjP8OEpCvuwKw0W4bSAxJpenh9QtMI6udwTBGcPh7Vn/OBgUU1ER2VxFGAMb92WDMuKdirr 5Id1HQo9SUQXeqv85xjnmoOdUgF24i7rMhUiKBobntwaSrbdb9erWLceJ2SzxekawD/mHJ+zIzMAQ GF4s9Udw==; Received: from [2001:8b0:10b:5:baa5:735b:df3b:ad66] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1sZrq7-000000011vy-2Qrh; Fri, 02 Aug 2024 12:57:00 +0000 Message-ID: Subject: Re: [PATCH] KVM: x86: Use gfn_to_pfn_cache for steal_time From: David Woodhouse To: Matthew Wilcox Cc: Carsten Stollmaier , Sean Christopherson , Paolo Bonzini , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , nh-open-source@amazon.com, Peter Xu , Sebastian Biemueller , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Andrew Morton , "linux-mm@kvack.org" , Andrea Arcangeli Date: Fri, 02 Aug 2024 13:56:58 +0100 In-Reply-To: References: <20240802114402.96669-1-stollmc@amazon.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-wnXlQ7VT1N8w0sxttcKq" User-Agent: Evolution 3.44.4-0ubuntu2 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 --=-wnXlQ7VT1N8w0sxttcKq Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2024-08-02 at 13:53 +0100, David Woodhouse wrote: > On Fri, 2024-08-02 at 13:38 +0100, Matthew Wilcox wrote: > > On Fri, Aug 02, 2024 at 01:03:16PM +0100, David Woodhouse wrote: > > > On Fri, 2024-08-02 at 11:44 +0000, Carsten Stollmaier wrote: > > > > handle_userfault uses TASK_INTERRUPTIBLE, so it is interruptible by > > > > signals. do_user_addr_fault then busy-retries it if the pending sig= nal > > > > is non-fatal. This leads to contention of the mmap_lock. > >=20 > > Why does handle_userfault use TASK_INTERRUPTIBLE?=C2=A0 We really don't > > want to stop handling a page fault just because somebody resized a > > window or a timer went off.=C2=A0 TASK_KILLABLE, sure. >=20 > Well, the literal answer there in this case is "because we ask it to". >=20 > The handle_userfault() function will literally do what it's told by the > fault flags:=20 >=20 > static inline unsigned int userfaultfd_get_blocking_state(unsigned int fl= ags) > { > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0if (flags & FAULT_FLAG_IN= TERRUPTIBLE) > =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=A0return TASK_INTERRUPTIBLE; >=20 > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0if (flags & FAULT_FLAG_KI= LLABLE) > =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=A0return TASK_KILLABLE; >=20 > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0return TASK_UNINTERRUPTIB= LE; > } >=20 >=20 > Hence the other potential workaround I mentioned, for > do_user_addr_fault() *not* to ask it to, for faults from the kernel: >=20 > > >=20 > > > --- a/arch/x86/mm/fault.c > > > +++ b/arch/x86/mm/fault.c > > > @@ -1304,6 +1304,8 @@ void do_user_addr_fault(struct pt_regs *regs, > > > =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 if (user_mode(regs)) > > > =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 flags |=3D FAULT_FLAG_USER; > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 else > > > +=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 flags &=3D ~FAULT_FLAG_INTERRUPTIBLE; > > > =C2=A0 > > > =C2=A0#ifdef CONFIG_X86_64 > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 /* > > >=20 >=20 >=20 > But I don't know that I agree with your statement above, that we "don't > want to stop handling a page fault just because somebody resized a > window or a timer went off".=20 See also "we don't want to stop waiting for a page fault, just because somebody hit Ctrl-C, but SIGINT has a trivial handler to do some minor cleanup before exiting so it isn't considered a *fatal* signal". I'm very sure I'd disagree with that one :) --=-wnXlQ7VT1N8w0sxttcKq Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 aW9uIEF1dGhvcml0eTAeFw0xODExMDIwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMIGWMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRgwFgYD VQQKEw9TZWN0aWdvIExpbWl0ZWQxPjA8BgNVBAMTNVNlY3RpZ28gUlNBIENsaWVudCBBdXRoZW50 aWNhdGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC AQEAyjztlApB/975Rrno1jvm2pK/KxBOqhq8gr2+JhwpKirSzZxQgT9tlC7zl6hn1fXjSo5MqXUf ItMltrMaXqcESJuK8dtK56NCSrq4iDKaKq9NxOXFmqXX2zN8HHGjQ2b2Xv0v1L5Nk1MQPKA19xeW 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