On Mon, Jul 08, 2019 at 07:13:28PM +0000, Jerin Jacob Kollanukkaran wrote: > See below, > > Please send the email as text to avoid formatting issue.(No HTML) > > From: David Marchand <[email protected]> > Sent: Tuesday, July 9, 2019 12:09 AM > To: Jerin Jacob Kollanukkaran <[email protected]> > Cc: dev <[email protected]>; Thomas Monjalon <[email protected]>; Ben Walker > <[email protected]>; Burakov, Anatoly <[email protected]> > Subject: [EXT] Re: [dpdk-dev] [PATCH] bus/pci: fix IOVA as VA mode selection > > ________________________________________ > > On Mon, Jul 8, 2019 at 4:25 PM <mailto:[email protected]> wrote: > From: Jerin Jacob <mailto:[email protected]> > > Existing logic fails to select IOVA mode as VA > if driver request to enable IOVA as VA. > > IOVA as VA has more strict requirement than other modes, > so enabling positive logic for IOVA as VA selection. > > This patch also updates the default IOVA mode as PA > for PCI devices as it has to deal with DMA engines unlike > the virtual devices that may need only IOVA as DC. > > We have three cases: > - driver/hw supports IOVA as PA only > > [Jerin] It is not driver cap, it is more of system cap(IOMMU vs non IOMMU). > We are already addressing that case >
Not necessarily. It's possible to have hardware that does not use the IOMMU on a platform. Therefore, you have more than two options to support. /Bruce
