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Date: Sat, 12 Sep 2020 19:29:38 +0000 From: Michael Kelley <mikelley@...rosoft.com> To: Boqun Feng <boqun.feng@...il.com>, "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>, "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>, "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>, "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org> CC: KY Srinivasan <kys@...rosoft.com>, Haiyang Zhang <haiyangz@...rosoft.com>, Stephen Hemminger <sthemmin@...rosoft.com>, Wei Liu <wei.liu@...nel.org>, Jiri Kosina <jikos@...nel.org>, Benjamin Tissoires <benjamin.tissoires@...hat.com>, Dmitry Torokhov <dmitry.torokhov@...il.com>, "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, "James E.J. Bottomley" <jejb@...ux.ibm.com>, "Martin K. Petersen" <martin.petersen@...cle.com>, "will@...nel.org" <will@...nel.org>, "ardb@...nel.org" <ardb@...nel.org>, "arnd@...db.de" <arnd@...db.de>, "catalin.marinas@....com" <catalin.marinas@....com>, "Mark.Rutland@....com" <Mark.Rutland@....com>, "maz@...nel.org" <maz@...nel.org> Subject: RE: [PATCH v3 03/11] Drivers: hv: vmbus: Introduce types of GPADL From: Boqun Feng <boqun.feng@...il.com> Sent: Thursday, September 10, 2020 7:35 AM > > This patch introduces two types of GPADL: HV_GPADL_{BUFFER, RING}. The > types of GPADL are purely the concept in the guest, IOW the hypervisor > treat them as the same. > > The reason of introducing the types for GPADL is to support guests whose > page size is not 4k (the page size of Hyper-V hypervisor). In these > guests, both the headers and the data parts of the ringbuffers need to > be aligned to the PAGE_SIZE, because 1) some of the ringbuffers will be > mapped into userspace and 2) we use "double mapping" mechanism to > support fast wrap-around, and "double mapping" relies on ringbuffers > being page-aligned. However, the Hyper-V hypervisor only uses 4k > (HV_HYP_PAGE_SIZE) headers. Our solution to this is that we always make > the headers of ringbuffers take one guest page and when GPADL is > established between the guest and hypervisor, the only first 4k of > header is used. To handle this special case, we need the types of GPADL > to differ different guest memory usage for GPADL. > > Type enum is introduced along with several general interfaces to > describe the differences between normal buffer GPADL and ringbuffer > GPADL. > > Signed-off-by: Boqun Feng <boqun.feng@...il.com> > --- > drivers/hv/channel.c | 160 +++++++++++++++++++++++++++++++++++------ > include/linux/hyperv.h | 44 +++++++++++- > 2 files changed, 183 insertions(+), 21 deletions(-) > Reviewed-by: Michael Kelley <mikelley@...rosoft.com>
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