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Donenfeld" , Richard Henderson , linux-alpha@vger.kernel.org, Russell King , linux-arm-kernel@lists.infradead.org, Catalin Marinas , Huacai Chen , loongarch@lists.linux.dev, Geert Uytterhoeven , linux-m68k@lists.linux-m68k.org, Dinh Nguyen , Jonas Bonn , linux-openrisc@vger.kernel.org, Helge Deller , linux-parisc@vger.kernel.org, Michael Ellerman , linuxppc-dev@lists.ozlabs.org, Paul Walmsley , linux-riscv@lists.infradead.org, Heiko Carstens , linux-s390@vger.kernel.org, "David S. Miller" , sparclinux@vger.kernel.org Date: Mon, 13 Apr 2026 16:33:12 +0100 In-Reply-To: <20260410120318.592237447@kernel.org> References: <20260410120044.031381086@kernel.org> <20260410120318.592237447@kernel.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-vt+GQ8cE1r98bSrQsw7r" User-Agent: Evolution 3.52.3-0ubuntu1.1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by desiato.infradead.org. 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List-ID: List-Subscribe: List-Unsubscribe: --=-vt+GQ8cE1r98bSrQsw7r Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2026-04-10 at 14:19 +0200, Thomas Gleixner wrote: > get_cycles() is not really well defined and similar to other usaage of th= e > underlying hardware CPU counters the PTP vmclock should use an explicit > interface as well. >=20 > Implement ptp_vmclock_read_cpu_counter() in arm64 and x86 and simplify th= e > Kconfig selection while at it. >=20 > No functional change. >=20 > Signed-off-by: Thomas Gleixner > Cc: David Woodhouse Acked-by: David Woodhouse Although I might follow up with a change to make this... > +static inline u64 ptp_vmclock_read_cpu_counter(void) > +{ > + return cpu_feature_enabled(X86_FEATURE_TSC) ? rdtsc() : 0; > +} > + ... depend on TSC_RELIABLE=C2=B9, since if the guest doesn't believe that i= t is, then the guest shouldn't be trying to use it as the basis for precise timing. =C2=B9 (Or... one of the other zoo of TSC flags for the gradually reducing brokenness over the years...) --=-vt+GQ8cE1r98bSrQsw7r Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCD9Aw ggSOMIIDdqADAgECAhAOmiw0ECVD4cWj5DqVrT9PMA0GCSqGSIb3DQEBCwUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBDQTAeFw0yNDAxMzAwMDAwMDBaFw0zMTEx MDkyMzU5NTlaMEExCzAJBgNVBAYTAkFVMRAwDgYDVQQKEwdWZXJva2V5MSAwHgYDVQQDExdWZXJv a2V5IFNlY3VyZSBFbWFpbCBHMjCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMjvgLKj jfhCFqxYyRiW8g3cNFAvltDbK5AzcOaR7yVzVGadr4YcCVxjKrEJOgi7WEOH8rUgCNB5cTD8N/Et GfZI+LGqSv0YtNa54T9D1AWJy08ZKkWvfGGIXN9UFAPMJ6OLLH/UUEgFa+7KlrEvMUupDFGnnR06 aDJAwtycb8yXtILj+TvfhLFhafxroXrflspavejQkEiHjNjtHnwbZ+o43g0/yxjwnarGI3kgcak7 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