[{"id":3676827,"web_url":"http://patchwork.ozlabs.org/comment/3676827/","msgid":"<7a48b636cb3146f4f7134c6d4fe42070ac2edb43.camel@infradead.org>","date":"2026-04-13T15:33:12","subject":"Re: [patch 15/38] ptp: ptp_vmclock: Replace get_cycles() usage","submitter":{"id":26,"url":"http://patchwork.ozlabs.org/api/people/26/","name":"David Woodhouse","email":"dwmw2@infradead.org"},"content":"On Fri, 2026-04-10 at 14:19 +0200, Thomas Gleixner wrote:\n> get_cycles() is not really well defined and similar to other usaage of the\n> underlying hardware CPU counters the PTP vmclock should use an explicit\n> interface as well.\n> \n> Implement ptp_vmclock_read_cpu_counter() in arm64 and x86 and simplify the\n> Kconfig selection while at it.\n> \n> No functional change.\n> \n> Signed-off-by: Thomas Gleixner \n> Cc: David Woodhouse \n\nAcked-by: David Woodhouse \n\nAlthough I might follow up with a change to make this...\n\n> +static inline u64 ptp_vmclock_read_cpu_counter(void)\n> +{\n> +\treturn cpu_feature_enabled(X86_FEATURE_TSC) ? rdtsc() : 0;\n> +}\n> +\n\n... depend on TSC_RELIABLE¹, since if the guest doesn't believe that it\nis, then the guest shouldn't be trying to use it as the basis for\nprecise timing.\n\n¹ (Or... one of the other zoo of TSC flags for the gradually reducing\nbrokenness over the years...)","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n secure) header.d=infradead.org header.i=@infradead.org header.a=rsa-sha256\n header.s=desiato.20200630 header.b=gvEodDXy;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=112.213.38.117; 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Donenfeld\" , Richard\n Henderson , linux-alpha@vger.kernel.org,\n Russell King , linux-arm-kernel@lists.infradead.org,\n Catalin Marinas , Huacai Chen\n , loongarch@lists.linux.dev, Geert Uytterhoeven\n , linux-m68k@lists.linux-m68k.org, Dinh Nguyen\n , Jonas Bonn ,\n linux-openrisc@vger.kernel.org, Helge Deller ,\n linux-parisc@vger.kernel.org, Michael Ellerman ,\n linuxppc-dev@lists.ozlabs.org, Paul Walmsley ,\n linux-riscv@lists.infradead.org, Heiko Carstens ,\n linux-s390@vger.kernel.org, \"David S. Miller\" ,\n 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>\n\t <20260410120318.592237447@kernel.org>","Content-Type":"multipart/signed; micalg=\"sha-256\";\n protocol=\"application/pkcs7-signature\";\n\tboundary=\"=-vt+GQ8cE1r98bSrQsw7r\"","User-Agent":"Evolution 3.52.3-0ubuntu1.1 ","X-Mailing-List":"linuxppc-dev@lists.ozlabs.org","List-Id":"","List-Help":"","List-Owner":"","List-Post":"","List-Archive":",\n ","List-Subscribe":",\n ,\n ","List-Unsubscribe":"","Precedence":"list","MIME-Version":"1.0","X-SRS-Rewrite":"SMTP reverse-path rewritten from by\n desiato.infradead.org. See http://www.infradead.org/rpr.html","X-Spam-Status":"No, score=-2.4 required=3.0 tests=DKIM_SIGNED,DKIM_VALID,\n\tDKIM_VALID_AU,RCVD_IN_DNSWL_MED,SPF_HELO_NONE,SPF_NONE\n\tautolearn=disabled version=4.0.1 OzLabs 8","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org"}},{"id":3676896,"web_url":"http://patchwork.ozlabs.org/comment/3676896/","msgid":"<07df88e5-208d-4aac-9668-a3b0c65ae529@app.fastmail.com>","date":"2026-04-13T19:30:11","subject":"Re: [patch 15/38] ptp: ptp_vmclock: Replace get_cycles() usage","submitter":{"id":30,"url":"http://patchwork.ozlabs.org/api/people/30/","name":"Arnd Bergmann","email":"arnd@arndb.de"},"content":"On Mon, Apr 13, 2026, at 17:33, David Woodhouse wrote:\n> On Fri, 2026-04-10 at 14:19 +0200, Thomas Gleixner wrote:\n>\n> ... depend on TSC_RELIABLE¹, since if the guest doesn't believe that it\n> is, then the guest shouldn't be trying to use it as the basis for\n> precise timing.\n>\n> ¹ (Or... one of the other zoo of TSC flags for the gradually reducing\n> brokenness over the years...)\n\nIt looks like this is sufficiently handled in the caller:\n\nstatic int vmclock_get_crosststamp(struct vmclock_state *st,\n struct ptp_system_timestamp *sts,\n struct system_counterval_t *system_counter,\n struct timespec64 *tspec)\n{\n....\n#ifdef CONFIG_X86\n /*\n * We'd expect the hypervisor to know this and to report the clock\n * status as VMCLOCK_STATUS_UNRELIABLE. But be paranoid.\n */\n if (check_tsc_unstable())\n return -EINVAL;\n#endif\n\nWith 486 and ELAN out of the way, Winchip6 seems to be the only\none without X86_FEATURE_TSC, so I think the next logical step would\nbe to turn off Winchip6 as well and remove all X86_FEATURE_TSC\nand CONFIG_X86_TSC checks.\n\n Arnd","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=arndb.de header.i=@arndb.de header.a=rsa-sha256\n header.s=fm1 header.b=eBEb3+z4;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=messagingengine.com header.i=@messagingengine.com\n header.a=rsa-sha256 header.s=fm2 header.b=fK2XbJ97;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=112.213.38.117; helo=lists.ozlabs.org;\n envelope-from=linuxppc-dev+bounces-19719-incoming=patchwork.ozlabs.org@lists.ozlabs.org;\n receiver=patchwork.ozlabs.org)","lists.ozlabs.org;\n arc=none smtp.remote-ip=103.168.172.139","lists.ozlabs.org;\n dmarc=pass (p=none dis=none) header.from=arndb.de","lists.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=arndb.de header.i=@arndb.de header.a=rsa-sha256\n header.s=fm1 header.b=eBEb3+z4;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=messagingengine.com header.i=@messagingengine.com\n header.a=rsa-sha256 header.s=fm2 header.b=fK2XbJ97;\n\tdkim-atps=neutral","lists.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=arndb.de\n (client-ip=103.168.172.139; 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Donenfeld\" ,\n \"Richard Henderson\" ,\n linux-alpha@vger.kernel.org, \"Russell King\" ,\n linux-arm-kernel@lists.infradead.org,\n \"Catalin Marinas\" ,\n \"Huacai Chen\" , loongarch@lists.linux.dev,\n \"Geert Uytterhoeven\" ,\n linux-m68k@lists.linux-m68k.org, \"Dinh Nguyen\" ,\n \"Jonas Bonn\" ,\n \"linux-openrisc@vger.kernel.org\" ,\n \"Helge Deller\" , linux-parisc@vger.kernel.org,\n \"Michael Ellerman\" , linuxppc-dev@lists.ozlabs.org,\n \"Paul Walmsley\" , linux-riscv@lists.infradead.org,\n \"Heiko Carstens\" , linux-s390@vger.kernel.org,\n \"David S . Miller\" , sparclinux@vger.kernel.org","Message-Id":"<07df88e5-208d-4aac-9668-a3b0c65ae529@app.fastmail.com>","In-Reply-To":"<7a48b636cb3146f4f7134c6d4fe42070ac2edb43.camel@infradead.org>","References":"<20260410120044.031381086@kernel.org>\n <20260410120318.592237447@kernel.org>\n <7a48b636cb3146f4f7134c6d4fe42070ac2edb43.camel@infradead.org>","Subject":"Re: [patch 15/38] ptp: ptp_vmclock: Replace get_cycles() usage","Content-Type":"text/plain; charset=utf-8","Content-Transfer-Encoding":"quoted-printable","X-Spam-Status":"No, score=-0.9 required=3.0 tests=DKIM_SIGNED,DKIM_VALID,\n\tDKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_LOW,SPF_HELO_PASS,SPF_PASS\n\tautolearn=disabled version=4.0.1 OzLabs 8","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org"}}]