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 9E17018E34B; Tue, 20 Aug 2024 10:12:05 +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=1724148730; cv=none; b=nXCjG8oLvIp+Wlkcf25BcnRTdC+7iVq7ulrqAh2AMx/lXtisG6ueNFAraYiHQKCUNyoszodUKqjULvjvz3G5WZ7+1mXmJUekbXLRHWflSf2LnPfNLXx5F+VtnEqRBTxbY2txWB75BCcsOQXSRd+vCCVwvg4LYjiuhM/8jijS1w0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724148730; c=relaxed/simple; bh=X1ovsn2F+ANZD6UJeGZbZ6bCQyiWt1CWfIHYtFKX4R4=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=HrTth7AcpTifwMJwZ8vvDTdm3eAh+1/waC7sHJh+y09VVQebNPGaTeZKtUsJS2mNw9tALNMZOjjETp9i/EZ1beYwQMrTv0yqBfB0ZYSs8Rd7LWJLDuJRqU+lk3gTQ5HvwHHd+h7SyAOUnzQLa+VcYhOwr18ms78gOWb1933KP3A= 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=H03aBhu+; 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="H03aBhu+" 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=X1ovsn2F+ANZD6UJeGZbZ6bCQyiWt1CWfIHYtFKX4R4=; b=H03aBhu+/ooTAnXvsf0XBN9WH8 eJT5v5iXWxt1bpKXppB6/z1JAlikjMmXeoVkOZZ1UsGuUor5IQcdFpCRh2Rl+fvsUJX/a5oQvdjYg Hpvd06QXhhsyw+LhF06kZHAaxvs2seyH/AQwLHb6iNgs0cbnLjOkZP7f5IbiZyZNvY+Zo6fZmhW+w DKrY5KY/XTH1W6/Fb2UQDyOLviCzvIB8ja2DxQ861bAam7nHmKuj6jF0lAEwWYus+qNGMD3VFQ57+ Q0PMHSrl2cbjeHYS1uhwnkRshTtPGPCAFbJqd+1k6NgCgDM1NaUgn4eJ8qB4yybgB4jS3Jk1vc9MT BShgI83A==; Received: from [2001:8b0:10b:5:cb53:8564:1f06:36f6] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1sgLq9-00000007pNx-25Om; Tue, 20 Aug 2024 10:11:49 +0000 Message-ID: Subject: Re: [PATCH] KVM: x86: Use gfn_to_pfn_cache for steal_time From: David Woodhouse To: Sean Christopherson Cc: Carsten Stollmaier , 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, Matthew Wilcox , Andrew Morton , "linux-mm@kvack.org" Date: Tue, 20 Aug 2024 11:11:48 +0100 In-Reply-To: References: <20240802114402.96669-1-stollmc@amazon.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-Z0KpPo4xLge13VdjKAaC" 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 --=-Z0KpPo4xLge13VdjKAaC Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2024-08-16 at 17:22 -0700, Sean Christopherson wrote: > On Fri, Aug 02, 2024, David Woodhouse wrote: > > On Fri, 2024-08-02 at 11:44 +0000, Carsten Stollmaier wrote: > > > On vcpu_run, before entering the guest, the update of the steal time > > > information causes a page-fault if the page is not present. In our > > > scenario, this gets handled by do_user_addr_fault and successively > > > handle_userfault since we have the region registered to that. > > >=20 > > > 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 > > The busy-loop causes so much contention on mmap_lock that post-copy > > live migration fails to make progress, and is leading to failures. Yes? > >=20 > > > This patch replaces the use of gfn_to_hva_cache with gfn_to_pfn_cache= , > > > as gfn_to_pfn_cache ensures page presence for the memory access, > > > preventing the contention of the mmap_lock. > > >=20 > > > Signed-off-by: Carsten Stollmaier > >=20 > > Reviewed-by: David Woodhouse > >=20 > > I think this makes sense on its own, as it addresses the specific case > > where KVM is *likely* to be touching a userfaulted (guest) page. And it > > allows us to ditch yet another explicit asm exception handler. >=20 > At the cost of using a gpc, which has its own complexities. >=20 > But I don't understand why steal_time is special.=C2=A0 If the issue is e= ssentially > with handle_userfault(), can't this happen on any KVM uaccess? Theoretically, yes. The steal time is only special in that it happens so *often*, every time the vCPU is scheduled in. We should *also* address the general case, perhaps making by interruptible user access functions as discussed. But this solves the immediate issue which is being observed, *and* lets us ditch the last explicit asm exception handling in kvm/x86.c which is why I think it's worth doing anyway, even if there's an upcoming fix for the general case. --=-Z0KpPo4xLge13VdjKAaC 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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