Re: [PATCH v5 06/10] KVM: xen: allow shared_info to be mapped by fixed HVA

[David Woodhouse]

On Fri, 2023-09-22 at 15:00 +0000, Paul Durrant wrote:
> From: Paul Durrant <pdurrant@xxxxxxxxxx>
> 
> The shared_info page is not guest memory as such. It is a dedicated page
> allocated by the VMM and overlaid onto guest memory in a GFN chosen by the
> guest. The guest may even request that shared_info be moved from one GFN
> to another, but the HVA is never going to change. Thus it makes much more
> sense to map the shared_info page in kernel once using this fixed HVA.

The words "makes much more sense" are doing a *lot* of work there. :)

When heckling the cover letter in
https://lore.kernel.org/kvm/d13e459e221f28fb1865eedea023e583a2277ab1.camel@xxxxxxxxxxxxx/
I suggested that the explanation probably wants to make it into a
commit message rather than just the cover letter which tends not to be
preserved in the commit history. It's *this* commit which needs it, I
think.

Attachment: smime.p7s
Description: S/MIME cryptographic signature