On 10/02/2017 06:52 PM, Benjamin Herrenschmidt wrote: > On Mon, 2017-10-02 at 18:27 +0200, Cédric Le Goater wrote: >> On 09/23/2017 10:26 AM, Cédric Le Goater wrote: >>> Hi, >>> >>> Here are a couple of small fixes to support CPU hot unplug. There are >>> still some issues to be investigated as, in some occasions, after a >>> couple of plug and unplug, the cpu which was removed receives a 'lost' >>> interrupt. This showed to be the decrementer under QEMU. >> >> So this seems to be a QEMU issue only which can be solved by >> removing the DEE bit from the LPCR on P9 processor when the CPU >> is stopped in rtas. PECE3 bit on P8 processors. > > It should be the same bit no ?
yes and it is for the QEMU side of the world. C. >> I think these patches are valuable fixes for 4.14. The first >> is trivial and the second touches the common xive part but it >> is only called on the pseries platform. >> >> Could you please take a look ? >> >> Thanks, >> >> C. >> >>> Nevertheless, these patches are required and provide a significant >>> improvement to support CPU removal. >>> >>> Tested under a phyp and a XIVE QEMU model for pseries. >>> >>> Thanks, >>> >>> C. >>> >>> Cédric Le Goater (2): >>> powerpc/xive: fix IPI reset >>> powerpc/xive: fix cpu removal >>> >>> arch/powerpc/sysdev/xive/common.c | 8 ++++++++ >>> arch/powerpc/sysdev/xive/spapr.c | 4 ++++ >>> 2 files changed, 12 insertions(+) >>>
