Re: [PATCH qemu] ppc/kvm: Skip writing DPDES back when in run time state

2019-09-24 Thread David Gibson
On Mon, Sep 23, 2019 at 06:41:10PM +1000, Alexey Kardashevskiy wrote: > On POWER8 systems the Directed Privileged Door-bell Exception State > register (DPDES) stores doorbell pending status, one bit per a thread > of a core, set by "msgsndp" instruction. The register is shared among > threads of th

[PATCH qemu] ppc/kvm: Skip writing DPDES back when in run time state

2019-09-23 Thread Alexey Kardashevskiy
On POWER8 systems the Directed Privileged Door-bell Exception State register (DPDES) stores doorbell pending status, one bit per a thread of a core, set by "msgsndp" instruction. The register is shared among threads of the same core and KVM on POWER9 emulates it in a similar way (POWER9 does not ha