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 0286F1C0DEC; Fri, 2 Aug 2024 12:53:28 +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=1722603210; cv=none; b=nEOxBgObTFpJMcb2gdFE7Od+NdFU4APEvOX3nQEL8/hudYyHll7M0G5XeVA1ErpXxAdEFvQjgfjCOgeWu0s5U0CSW9kd4zji6K06ofegwJaDNlhrgPrbMwqJejiLE9sWD6c1K2uG6HerosYrN36EDlK7sL6SRDd6AeVp9p1WC+M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722603210; c=relaxed/simple; bh=IPSAKkvoXrd/TERC2Pb3EJxslwwNPmnKelXrEIuX6rI=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=e6JNahtNMRuUTxajqyQM1DPUIztJamUYZ/UPgvioJbMqlSKc06hb3ebB8OcrS8pF7KTN+ooUVYkNvlc8nRmlXGfovn6fqG6E5UAOBzD7uVaY5wJNAKwjr2OlX0b7L10RyhMTsYYLlFloZbz83TTQycEpJ85sNMiIiC1GGz81rM8= 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=gk5Gcgpj; 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="gk5Gcgpj" 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=9C0txoyRv53d0LXmfV4O/jld3nQsaMKAicBUBmaAY9I=; b=gk5GcgpjJbKKptiDGl0ya2ufFQ LgyRrcBT8hsG6ptQjze9M5jyyZE6fzLNmSwf5c0D0GUMqWgqoBVHdAsACc0Cb/aFjLeJRO/756lPV OIIulHnkSO9dlJmrrNOF7Mtu08uX9tO31U4vxyTgWEVHW2qBXuoKnHFabFLyQSAPlPM3Gqx9wsujs pVpimTkfm7LoZPBZYuQ3uGLbVYLrzls6S9ToKc4qVD2zXas51CJKxTA21WuK9JOR59rZuKgWNiJy/ yNnuT5Qc9sZqGD7jBFx2beBN4POCKrjXioRgvMd+kZF2wj0gk/TDKQNYCJR5ceJR7v49MLpij73PN eMzi5++A==; 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 1sZrmY-000000011mf-0fCr; Fri, 02 Aug 2024 12:53:18 +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 13:53:17 +0100 In-Reply-To: References: <20240802114402.96669-1-stollmc@amazon.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-BBKSddBfoWEUvesBzQl/" 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 --=-BBKSddBfoWEUvesBzQl/ Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable 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 signa= l > > > 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. Well, the literal answer there in this case is "because we ask it to". The handle_userfault() function will literally do what it's told by the fault flags:=20 static inline unsigned int userfaultfd_get_blocking_state(unsigned int flag= s) { if (flags & FAULT_FLAG_INTERRUPTIBLE) return TASK_INTERRUPTIBLE; if (flags & FAULT_FLAG_KILLABLE) return TASK_KILLABLE; return TASK_UNINTERRUPTIBLE; } Hence the other potential workaround I mentioned, for do_user_addr_fault() *not* to ask it to, for faults from the kernel: > >=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 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 In fact, I don't think we *do* even stop handling the page fault in those cases; we just stop *waiting* for it to be handled.=20 In fact, couldn't you contrive a test case where a thread is handling its own uffd faults via SIGIO, where it's the opposite of what you say. In that case the *only* way the fault actually gets handled is if we let the signal happen instead of just waiting?=C2=A0 That doesn't seem like *such* a contrived case either =E2=80=94 that seems perfectly reasonable for a vCPU thread, to then handle its own missing pages? --=-BBKSddBfoWEUvesBzQl/ 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 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