From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5EE84C4332F for ; Fri, 25 Feb 2022 16:52:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243189AbiBYQxS (ORCPT ); Fri, 25 Feb 2022 11:53:18 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37364 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239892AbiBYQww (ORCPT ); Fri, 25 Feb 2022 11:52:52 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1DF676431; Fri, 25 Feb 2022 08:52:19 -0800 (PST) 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=ERnS6dWoHSK4o9E6IHl/mz8maLZlK5Tg+x00AaGU8R0=; b=IJI7BsLy+eaSr2yVVCmsDX49VV iJ1i4/QrHg7SB5lF3dHhnDxN5BpfudPqV4/1kMiholFxXaRlsZChttIhpDptV04QFRG7lmlqEUkS+ IO1JFDn8ivoDyEpNP3f3MPPweo8c1YraMI492lYIeqL2oTHWI67HeWTtgNLHXbBZ3MOh/+kCdtYkw Dm7QTUBCGW+Z7y+LafxEgSA1hWPrgn3OL62vwij4FRrfl/cbWgShLZu23mTGNhTwCGqh9jB5ysJB7 bp+UZs/K5eVyB/n0B1KLswzHX05Tuxa3a+ntyoj/hyc7bNYZuWIHPbNYt4h9FOC6G52Z91YAnx5bE iYHvDeLg==; Received: from [2001:8b0:10b:1::3ae] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1nNdp0-005xCk-R7; Fri, 25 Feb 2022 16:52:01 +0000 Message-ID: <95aecbfae5ecad47cf06b30bb415f273b67ed3a3.camel@infradead.org> Subject: Re: [PATCH] KVM: x86: Don't snapshot "max" TSC if host TSC is constant From: David Woodhouse To: Sean Christopherson Cc: Paolo Bonzini , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Suleiman Souhlal , Anton Romanov Date: Fri, 25 Feb 2022 16:51:57 +0000 In-Reply-To: References: <20220225013929.3577699-1-seanjc@google.com> <5b9e5a3f3d3c40afea0bc953e3967505251f3143.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-+pjGCueqYU1tMzmjquc0" User-Agent: Evolution 3.36.5-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-+pjGCueqYU1tMzmjquc0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2022-02-25 at 16:40 +0000, Sean Christopherson wrote: > On Fri, Feb 25, 2022, David Woodhouse wrote: > > On Fri, 2022-02-25 at 01:39 +0000, Sean Christopherson wrote: > > > @@ -11160,7 +11162,7 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcp= u) > > > vcpu->arch.msr_platform_info =3D MSR_PLATFORM_INFO_CPUID_FAUL= T; > > > kvm_vcpu_mtrr_init(vcpu); > > > vcpu_load(vcpu); > > > - kvm_set_tsc_khz(vcpu, max_tsc_khz); > > > + kvm_set_tsc_khz(vcpu, max_tsc_khz ? : tsc_khz); > > > kvm_vcpu_reset(vcpu, false); > > > kvm_init_mmu(vcpu); > > > vcpu_put(vcpu); > > >=20 > >=20 > > Hm, now if you hit that race you end up potentially giving *different* > > frequencies to different vCPUs in a single guest, depending on when > > they were created. >=20 > Yep. Though the race is much harder to hit (userspace vs TSC refinement)= . The > existing race being hit is essentially do_initcalls() vs. TSC refinement.= =20 >=20 > > How about this... (and as noted, I think I want to add an explicit KVM > > ioctl to set kvm->arch.default_tsc_khz for subsequently created vCPUs). >=20 > This wouldn't necessarily help. E.g. assuming userspace knows the actual= TSC > frequency, creating a vCPU before refinement completes might put the vCPU= in > "always catchup" purgatory. Right. But at least they'd be *consistent*. I was actually making that change anyway, for the benefit of VMs where we are intentionally scaling to a known, different, TSC frequency =E2=80=94 which is currently completely hosed when all the vCPUs set it for themselves because the TSC sync then fails. > To really fix the race, KVM needs a notification that refinement complete= d (or > failed). KVM could simply refuse to create vCPUs until it got the notifi= cation. > In the non-constant case, KVM would also need to refresh max_tsc_khz. Hm, would the world be a better place if we knew that the delta between the unrefined and refined TSC values was always within the tolerance of tsc_tolerance_ppm for which we wouldn't bother scaling anyway? --=-+pjGCueqYU1tMzmjquc0 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 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