Re: [RFC 09/11] HID: hyperv: Make ringbuffer at least take two pages

2020-07-22 Thread boqun . feng
On Wed, Jul 22, 2020 at 11:36:15PM +, Michael Kelley wrote: > From: Boqun Feng Sent: Monday, July 20, 2020 6:42 PM > > > > When PAGE_SIZE > HV_HYP_PAGE_SIZE, we need the ringbuffer size to be at > > least 2 * PAGE_SIZE: one page for the header and at least one page of > > the data part (becau

RE: [RFC 09/11] HID: hyperv: Make ringbuffer at least take two pages

2020-07-22 Thread Michael Kelley
From: Boqun Feng Sent: Monday, July 20, 2020 6:42 PM > > When PAGE_SIZE > HV_HYP_PAGE_SIZE, we need the ringbuffer size to be at > least 2 * PAGE_SIZE: one page for the header and at least one page of > the data part (because of the alignment requirement for double mapping). > > So make sure the

[RFC 09/11] HID: hyperv: Make ringbuffer at least take two pages

2020-07-20 Thread Boqun Feng
When PAGE_SIZE > HV_HYP_PAGE_SIZE, we need the ringbuffer size to be at least 2 * PAGE_SIZE: one page for the header and at least one page of the data part (because of the alignment requirement for double mapping). So make sure the ringbuffer sizes to be at least 2 * PAGE_SIZE when using vmbus_ope