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 43E632032B for ; Wed, 17 Jan 2024 14:29:03 +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=1705501746; cv=none; b=ln2srC9JI9PfbPSspAsLQNhoO/8fNZNl4zGQPi+4nt2uhLaMc4fiiLIqueiaPD2ZnsLxTlaERDATjHRwi6gYQNYc48TLl0qweVU4qGxf80lGSEqQfT9JyTPzPoG1RVG8d96/OzvrAtNeMPacyQqRxYxKtR2pwKwFhlSMTfiPiDo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705501746; c=relaxed/simple; bh=w5g12fXLPh8tqMSeXyS+4XKME2jBgC6ScosSz+ZmhU8=; h=DKIM-Signature:Received:Message-ID:Subject:From:To:Cc:Date: In-Reply-To:References:Content-Type:User-Agent:MIME-Version: X-SRS-Rewrite; b=TeoBxiKk64x7MfpsvzfxvTuhPoHKvU4i6EqIJJ8tmvTtSqqZ3vORnhN697/A+n/jAhexoj5iLJwFHiqCwYiY7zOpQipmlMuIEddpKqwmgtewHrir0euMKkFBmaKTl5F0zrv7FCGr9Q+uUDsPunjS+rIvCPrMYrykBj0bkBt5kCc= 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=JfUgai4A; 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="JfUgai4A" 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=EEVNRY6PDY+bQuzaDZRUnGEbQeJ5JrxyjnQDbcCxel0=; b=JfUgai4AQLyBFggrYiiLJVJ/TP 0J1Iq0yeBK5haQPnVaCmjQ1q2tJzp+HYr2k0GUshx8JvCScjHXqceo0FMtBgq0fsVebd06NHz5SpB oTFIjFIgkch5IEwvq8hipy4oZZ2UrMrq1WDK6vCPmsRBMOhqH2tiRWL0A/HaXqTOomo3b9Btm1fyG WlKCvAQ4+Yc6P/YGgzpe+5wAj7cQTjEGlaVNRs44q/Z4crm+XEF5oy7DgqJJLN2VIwwWLACgU4q3q fOAMdTH5NSqV6uEGuwBi3/tEMD491H45QvcI2/e1jS6S+scNhr7XWEBffGYtgzDA3rpG3IS3QzzgE Xo8To/TA==; Received: from [54.239.6.188] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1rQ6uU-000000009d0-37Ol; Wed, 17 Jan 2024 14:28:54 +0000 Message-ID: Subject: Re: [PATCH v8 4/7] KVM: x86: Report host tsc and realtime values in KVM_GET_CLOCK From: David Woodhouse To: Oliver Upton , kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu Cc: Paolo Bonzini , Sean Christopherson , Marc Zyngier , Peter Shier , Jim Mattson , David Matlack , Ricardo Koller , Jing Zhang , Raghavendra Rao Anata , James Morse , Alexandru Elisei , Suzuki K Poulose , linux-arm-kernel@lists.infradead.org, Andrew Jones , Will Deacon , Catalin Marinas Date: Wed, 17 Jan 2024 15:28:51 +0100 In-Reply-To: <20210916181538.968978-5-oupton@google.com> References: <20210916181538.968978-1-oupton@google.com> <20210916181538.968978-5-oupton@google.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-T5uXFjtqSDR15CW778H7" User-Agent: Evolution 3.44.4-0ubuntu2 Precedence: bulk X-Mailing-List: kvm@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 --=-T5uXFjtqSDR15CW778H7 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2021-09-16 at 18:15 +0000, Oliver Upton wrote: >=20 > @@ -5878,11 +5888,21 @@ static int kvm_vm_ioctl_set_clock(struct kvm *kvm= , void __user *argp) > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 * is slightly ahead) her= e we risk going negative on unsigned > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 * 'system_time' when 'da= ta.clock' is very small. > =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=A0if (kvm->arch.use_master_clock= ) > -=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=A0now_ns =3D ka->master_kernel_ns; > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0if (data.flags & KVM_CLOCK_REA= LTIME) { > +=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=A0u64 now_real_ns =3D ktime_get_real_ns(); > + > +=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=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 * Avoid stepping the kvmclock backwards. > +=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=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=A0if (now_real_ns > data.realtime) > +=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=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0data.cloc= k +=3D now_real_ns - data.realtime; > +=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=A0if (ka->use_master_clock) > +=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=A0now_raw_ns =3D ka->master_kernel_ns; This looks wrong to me. > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0else > -=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=A0now_ns =3D get_kvmclock_base_ns(); > -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0ka->kvmclock_offset =3D data.c= lock - now_ns; > +=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=A0now_raw_ns =3D get_kvmclock_base_ns(); > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0ka->kvmclock_offset =3D data.c= lock - now_raw_ns; > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0kvm_end_pvclock_update(kv= m); > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0return 0; > =C2=A0} We use the host CLOCK_MONOTONIC_RAW plus the boot offset, as a 'kvmclock base clock', and get_kvmclock_base_ns() returns that. The KVM clocks for each VMs are based on this 'kvmclock base clock', each offset by a ka->kvmclock_offset which represents the time at which that VM was started =E2=80=94 so each VM's clock starts from zero. The values of ka->master_kernel_ns and ka->master_cycle_now represent a single point in time, the former being the value of get_kvmclock_base_ns() at that moment and the latter being the host TSC value. In pvclock_update_vm_gtod_copy(), kvm_get_time_and_clockread() is used to return both values at precisely the same moment, from the *same* rdtsc(). This allows the current 'kvmclock base clock' to be calculated at any moment by reading the TSC, calculating a delta to that reading from ka->master_cycle_now to determine how much time has elapsed since ka->master_kernel_ns. We can then add ka->kvmclock_offset to get the kvmclock for this particular VM. Now, looking at the code quoted above. It's given a kvm_clock_data struct which contains a value of the KVM clock which is to be set as the time "now", and all it does is adjust ka->kvmclock_offset accordingly. Which is really simple: now_raw_ns =3D get_kvmclock_base_ns(); ka->kvmclock_offset =3D data.clock - now_raw_ns; Et voil=C3=A0, now get_kvmclock_base_ns() + ka->kvmclock_offset at any give= n moment in time will result in a kvmclock value according to what was just set. Yay! Except... in the case where the TSC is constant, we actually set 'now_raw_ns' to a value that doesn't represent *now*. Instead, we set it to ka->master_kernel_ns which represents some point in the *past*. We should add the number of TSC ticks since ka->master_cycle_now if we're going to use that, surely? --=-T5uXFjtqSDR15CW778H7 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 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Re: [PATCH v8 4/7] KVM: x86: Report host tsc and realtime values in KVM_GET_CLOCK From: David Woodhouse To: Oliver Upton , kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu Cc: Paolo Bonzini , Sean Christopherson , Marc Zyngier , Peter Shier , Jim Mattson , David Matlack , Ricardo Koller , Jing Zhang , Raghavendra Rao Anata , James Morse , Alexandru Elisei , Suzuki K Poulose , linux-arm-kernel@lists.infradead.org, Andrew Jones , Will Deacon , Catalin Marinas Date: Wed, 17 Jan 2024 15:28:51 +0100 In-Reply-To: <20210916181538.968978-5-oupton@google.com> References: <20210916181538.968978-1-oupton@google.com> <20210916181538.968978-5-oupton@google.com> User-Agent: Evolution 3.44.4-0ubuntu2 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============3027230336148810161==" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org --===============3027230336148810161== Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-T5uXFjtqSDR15CW778H7" --=-T5uXFjtqSDR15CW778H7 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2021-09-16 at 18:15 +0000, Oliver Upton wrote: >=20 > @@ -5878,11 +5888,21 @@ static int kvm_vm_ioctl_set_clock(struct kvm *kvm= , void __user *argp) > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 * is slightly ahead) her= e we risk going negative on unsigned > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 * 'system_time' when 'da= ta.clock' is very small. > =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=A0if (kvm->arch.use_master_clock= ) > -=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=A0now_ns =3D ka->master_kernel_ns; > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0if (data.flags & KVM_CLOCK_REA= LTIME) { > +=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=A0u64 now_real_ns =3D ktime_get_real_ns(); > + > +=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=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 * Avoid stepping the kvmclock backwards. > +=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=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=A0if (now_real_ns > data.realtime) > +=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=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0data.cloc= k +=3D now_real_ns - data.realtime; > +=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=A0if (ka->use_master_clock) > +=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=A0now_raw_ns =3D ka->master_kernel_ns; This looks wrong to me. > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0else > -=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=A0now_ns =3D get_kvmclock_base_ns(); > -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0ka->kvmclock_offset =3D data.c= lock - now_ns; > +=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=A0now_raw_ns =3D get_kvmclock_base_ns(); > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0ka->kvmclock_offset =3D data.c= lock - now_raw_ns; > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0kvm_end_pvclock_update(kv= m); > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0return 0; > =C2=A0} We use the host CLOCK_MONOTONIC_RAW plus the boot offset, as a 'kvmclock base clock', and get_kvmclock_base_ns() returns that. The KVM clocks for each VMs are based on this 'kvmclock base clock', each offset by a ka->kvmclock_offset which represents the time at which that VM was started =E2=80=94 so each VM's clock starts from zero. The values of ka->master_kernel_ns and ka->master_cycle_now represent a single point in time, the former being the value of get_kvmclock_base_ns() at that moment and the latter being the host TSC value. In pvclock_update_vm_gtod_copy(), kvm_get_time_and_clockread() is used to return both values at precisely the same moment, from the *same* rdtsc(). This allows the current 'kvmclock base clock' to be calculated at any moment by reading the TSC, calculating a delta to that reading from ka->master_cycle_now to determine how much time has elapsed since ka->master_kernel_ns. We can then add ka->kvmclock_offset to get the kvmclock for this particular VM. Now, looking at the code quoted above. It's given a kvm_clock_data struct which contains a value of the KVM clock which is to be set as the time "now", and all it does is adjust ka->kvmclock_offset accordingly. Which is really simple: now_raw_ns =3D get_kvmclock_base_ns(); ka->kvmclock_offset =3D data.clock - now_raw_ns; Et voil=C3=A0, now get_kvmclock_base_ns() + ka->kvmclock_offset at any give= n moment in time will result in a kvmclock value according to what was just set. Yay! Except... in the case where the TSC is constant, we actually set 'now_raw_ns' to a value that doesn't represent *now*. Instead, we set it to ka->master_kernel_ns which represents some point in the *past*. We should add the number of TSC ticks since ka->master_cycle_now if we're going to use that, surely? --=-T5uXFjtqSDR15CW778H7 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 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