On 2025/7/15 14:11, CLEMENT MATHIEU--DRIF wrote:
On 14/07/2025 11:22 pm, Konstantin Belousov wrote:
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On Mon, Jul 14, 2025 at 05:41:22PM +0100, David Woodhouse wrote:
On 14 July 2025 15:28:09 GMT+01:00, Yi Liu <yi.l....@intel.com> wrote:
Hi David,
On 2025/7/14 16:00, David Woodhouse wrote:
From: David Woodhouse <d...@amazon.co.uk>
FreeBSD does both, and this appears to be perfectly valid. The VT-d
spec even talks about the ordering (the status write should be done
first, unsurprisingly).
Are you talking about the ordering constraint mentioned in bullet
"Page-request Drain (PD)"?
David is talking about the IF and SW flags. And he is correct. Spec has
below sentence. It means a wait descriptor can have both IF and SW set
and indeed completion interrupt happens later than status write. Let's
go on refine the patch. :)
"The invalidation completion event interrupt must push any in-flight
invalidation completion status
writes, including status writes that may have originated from the same
inv_wait_dsc for which the interrupt was generated."
Regards,
Yi Liu
