[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] x86: avoid HPET use on certain Intel platforms
On 22.11.2019 13:50, Andrew Cooper wrote: > On 22/11/2019 12:46, Jan Beulich wrote: >> Linux commit fc5db58539b49351e76f19817ed1102bf7c712d0 says >> >> "Some Coffee Lake platforms have a skewed HPET timer once the SoCs entered >> PC10, which in consequence marks TSC as unstable because HPET is used as >> watchdog clocksource for TSC." >> >> Follow this for Xen as well. Looking at its patch context made me notice >> they have a pre-existing quirk for Bay Trail as well. The comment there, >> however, points at a Cherry Trail document. Looking at the datasheets of >> both, there appear to be similar issues, so go beyond Linux'es coverage >> and exclude both. Also key the disable on the PCI IDs of the actual >> affected devices, rather than those of 00:00.0. >> >> Apply the workarounds only when the use of HPET was not explicitly >> requested on the command line and when use of (deep) C-states was not >> disabled. >> >> Adjust a few types in touched or nearby code at the same time. > > Reported-by ? The Linux commit has a Suggested-by, but no Reported-by. Do you want me to copy that one? Or else do you have any suggestion as to who the reporter was? >> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx> > > Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> Thanks. Jan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-devel
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