Re: [PATCH 3/3] powerpc/pseries: Add KVM guest doorbell restrictions

2020-06-30 Thread Nicholas Piggin
Excerpts from Paul Mackerras's message of June 30, 2020 6:26 pm: > On Tue, Jun 30, 2020 at 03:35:08PM +1000, Nicholas Piggin wrote: >> Excerpts from Paul Mackerras's message of June 30, 2020 12:27 pm: >> > On Sun, Jun 28, 2020 at 01:04:28AM +1000, Nicholas Piggin wrote: >> >> KVM guests have

Re: [PATCH 3/3] powerpc/pseries: Add KVM guest doorbell restrictions

2020-06-30 Thread Paul Mackerras
On Tue, Jun 30, 2020 at 03:35:08PM +1000, Nicholas Piggin wrote: > Excerpts from Paul Mackerras's message of June 30, 2020 12:27 pm: > > On Sun, Jun 28, 2020 at 01:04:28AM +1000, Nicholas Piggin wrote: > >> KVM guests have certain restrictions and performance quirks when > >> using doorbells. This

Re: [PATCH 3/3] powerpc/pseries: Add KVM guest doorbell restrictions

2020-06-29 Thread Nicholas Piggin
Excerpts from Paul Mackerras's message of June 30, 2020 12:27 pm: > On Sun, Jun 28, 2020 at 01:04:28AM +1000, Nicholas Piggin wrote: >> KVM guests have certain restrictions and performance quirks when >> using doorbells. This patch tests for KVM environment in doorbell >> setup, and optimises IPI

Re: [PATCH 3/3] powerpc/pseries: Add KVM guest doorbell restrictions

2020-06-29 Thread Paul Mackerras
On Sun, Jun 28, 2020 at 01:04:28AM +1000, Nicholas Piggin wrote: > KVM guests have certain restrictions and performance quirks when > using doorbells. This patch tests for KVM environment in doorbell > setup, and optimises IPI performance: > > - PowerVM guests may now use doorbells even if they

[PATCH 3/3] powerpc/pseries: Add KVM guest doorbell restrictions

2020-06-27 Thread Nicholas Piggin
KVM guests have certain restrictions and performance quirks when using doorbells. This patch tests for KVM environment in doorbell setup, and optimises IPI performance: - PowerVM guests may now use doorbells even if they are secure. - KVM guests no longer use doorbells if XIVE is available.