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Subject: [PATCH] split-ring: Demand that a device must not change descriptor entries
From: Jan Kiszka <jan.kiszka@siemens.com> So far the spec only indirectly says that a descriptor table entry is not modified by a device when processing it. Make this explicit by adding it as normative requirement. Existing drivers already depend on this. See also https://lists.oasis-open.org/archives/virtio-dev/201910/msg00057.html. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> --- split-ring.tex | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/split-ring.tex b/split-ring.tex index 123ac9f..bfef62d 100644 --- a/split-ring.tex +++ b/split-ring.tex @@ -217,7 +217,7 @@ \subsection{The Virtqueue Descriptor Table}\label{sec:Basic Facilities of a Virt \devicenormative{\subsubsection}{The Virtqueue Descriptor Table}{Basic Facilities of a Virtio Device / Virtqueues / The Virtqueue Descriptor Table} A device MUST NOT write to a device-readable buffer, and a device SHOULD NOT read a device-writable buffer (it MAY do so for debugging or diagnostic -purposes). +purposes). A device MUST NOT write to any descriptor table entry. \drivernormative{\subsubsection}{The Virtqueue Descriptor Table}{Basic Facilities of a Virtio Device / Virtqueues / The Virtqueue Descriptor Table} Drivers MUST NOT add a descriptor chain longer than $2^{32}$ bytes in total; -- 2.16.4
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