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Subject: [PATCH 1/3] shared memory: Define shared memory regions
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com> Define the requirements and idea behind shared memory regions. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> --- content.tex | 3 +++ shared-mem.tex | 25 +++++++++++++++++++++++++ 2 files changed, 28 insertions(+) create mode 100644 shared-mem.tex diff --git a/content.tex b/content.tex index b101d1b..321a2f4 100644 --- a/content.tex +++ b/content.tex @@ -331,6 +331,9 @@ Virtqueue format, or both. \input{split-ring.tex} \input{packed-ring.tex} + +\input{shared-mem.tex} + \chapter{General Initialization And Device Operation}\label{sec:General Initialization And Device Operation} We start with an overview of device initialization, then expand on the diff --git a/shared-mem.tex b/shared-mem.tex new file mode 100644 index 0000000..6da249c --- /dev/null +++ b/shared-mem.tex @@ -0,0 +1,25 @@ +\section{Shared Memory Regions}\label{sec:Basic Facilities of a Virtio Device / Shared Memory Regions} + +Shared memory regions are an additional facility +available to devices that need a region of memory that's +continuously shared between the host and the guest, rather +than passed between them in the way virtqueue elements are. + +Example uses include shared caches and version pools for versioned +data structures. + +Shared memory regions MUST NOT be used to control the operation +of the device, nor to stream data; those should still be performed +using virtqueues. + +A device may have multiple shared memory regions associated with +it. Each region has a \field{shmid} to identify it, the meaning +of which is device specific. + +Enumeration and location of shared memory regions is performed +using a transport-specific data structure. + +The guest physical address and the host virtual address MUST NOT +be used to identify structures within the memory regions; all +addressing MUST be relative to the start of a particular region. + -- 2.20.1
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