Re: [PATCH v3] ACPI/processor_idle: Remove dummy wait if kernel is in guest mode

2019-10-23 Thread Rafael J. Wysocki
On Wed, Oct 23, 2019 at 10:45 AM David Laight wrote: > > From: Yin Fengwei > > Sent: 23 October 2019 08:50 > > > > In function acpi_idle_do_entry(), an ioport access is used for dummy > > wait to guarantee hardware behavior. But it could trigger unnecessary > > vmexit if kernel is running as guest

RE: [PATCH v3] ACPI/processor_idle: Remove dummy wait if kernel is in guest mode

2019-10-23 Thread David Laight
From: Yin Fengwei > Sent: 23 October 2019 08:50 > In function acpi_idle_do_entry(), an ioport access is used for dummy > wait to guarantee hardware behavior. But it could trigger unnecessary > vmexit if kernel is running as guest in virtualization environtment. > > If it's in virtualization envi