Re: [Xen-devel] [PATCH] libxl: don't needlessly report "highmem" in use

[Wei Liu <wl@xxxxxxx>]

On Tue, Jan 07, 2020 at 03:58:07PM +0100, Jan Beulich wrote:
> Due to the unconditional updating of dom->highmem_end in
> libxl__domain_device_construct_rdm() I've observed on a 2Gb HVM guest
> with a passed through device (without overly large BARs, and with no RDM
> ranges at all)
> 
> (d2) RAM in high memory; setting high_mem resource base to 100000000
> ...
> (d2) E820 table:
> (d2)  [00]: 00000000:00000000 - 00000000:000a0000: RAM
> (d2)  HOLE: 00000000:000a0000 - 00000000:000d0000
> (d2)  [01]: 00000000:000d0000 - 00000000:00100000: RESERVED
> (d2)  [02]: 00000000:00100000 - 00000000:7f800000: RAM
> (d2)  HOLE: 00000000:7f800000 - 00000000:fc000000
> (d2)  [03]: 00000000:fc000000 - 00000001:00000000: RESERVED
> (d2)  [04]: 00000001:00000000 - 00000001:00000000: RAM
> 
> both of which aren't really appropriate in this case. Arrange for this
> to not happen.

Indeed. We shouldn't need to move RAM to high address in this
configuration.

Acked-by: Wei Liu <wl@xxxxxxx>

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