Re: [Xen-devel] [edk2-devel] [PATCH v4 22/35] OvmfPkg/XenPlatformPei: no hvmloader: get the E820 table via hypercall

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Thu, Aug 08, 2019 at 11:41:18AM +0100, Anthony PERARD wrote:
> On Wed, Aug 07, 2019 at 05:14:33PM +0200, Roger Pau Monné wrote:
> > On Mon, Jul 29, 2019 at 04:39:31PM +0100, Anthony PERARD wrote:
> > > When the Xen PVH entry point has been used, hvmloader hasn't run and
> > > hasn't prepared an E820 table. The only way left to get an E820 table
> > > is to ask Xen via an hypercall, the call can only be made once so keep
> > > the result cached for later.
> > 
> > I think we agreed that the above is not true, and that the memory
> > map can be fetched as many times as desired using the hypercall
> > interface.
> 
> Yes, I'll change the commit message. How about:
> 
>   When the Xen PVH entry point has been used, hvmloader hasn't run and
>   hasn't prepared an E820 table. The only way left to get an E820 table
>   is to ask Xen via an hypercall.  We keep the result cached to avoid
>   making a second hypercall which would give the same result.

LGTM, thanks.

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