On Tue, Apr 29, 2025 at 11:15:00AM -0700, Nicolin Chen wrote:
On Tue, Apr 29, 2025 at 06:10:31PM +0000, Pranjal Shrivastava wrote:
On Tue, Apr 29, 2025 at 08:28:01AM +0000, Pranjal Shrivastava wrote:
On Mon, Apr 28, 2025 at 03:44:08PM -0700, Nicolin Chen wrote:
On Mon, Apr 28, 2025 at 09:34:05PM +0000, Pranjal Shrivastava wrote:
On Fri, Apr 25, 2025 at 10:58:05PM -0700, Nicolin Chen wrote:
[...]
IIUC, one vintf can have multiple lvcmdqs and looking at the series it looks like the vcmdq_alloc allocates a single lvcmdq. Is the plan to dedicate one lvcmdq to per VM? Which means VMs can share a vintf?
VINTF is a vSMMU instance per SMMU. Each VINTF can have multiple LVCMDQs. Each vCMDQ is allocated per IOMMUFD_CMD_VCMDQ_ALLOC. In other word, VM can issue multiple IOMMUFD_CMD_VCMDQ_ALLOC calls for each VTINF/vSMMU.
Ack. I'm just wondering why would a single VM want more than one vCMDQ per vSMMU? [...]
I guess the only thing on this patch from me was to understand why would a single VM want more than one vCMDQ per vSMMU? (Just curious to know :) )
It gives some perf gain since it has two portals to fill commands.
Ohh! I'm imagining concurrent invalidations / commands! Interesting!
Nicolin
Thanks! Praan