On 29.04.22 16:52, Anthony PERARD wrote:
On Wed, Apr 20, 2022 at 10:04:26AM +0200, Juergen Gross wrote:libxl_domain_setmaxmem() called during "xl mem-max" should update the domain's memory/static-max Xenstore node, as otherwise "xl mem-set" won't be able to set the memory size to the new maximum.Setting domain's memory higher than the original mem-max only works on PV and maybe PVH guest, right? Because on HVM, QEMU is told about maxmem when starting a guest, and allocates some stuff from this address (vga buffer, pci rom I think) so trying to give HVM guest more memory after the fact is probably not going to go smoothly.
Works without a problem. This area is marked in the e820 memory map, so the guest won't use it to add memory.
Adjust the related comments and documentation accordingly. Signed-off-by: Juergen Gross <[email protected]> --- V2: - adjust comments and docs (Anthony Perard)Maybe `man xl` should be updated as well. In the section about `xl mem-max`, there is: "Note however that the initial maxmem value is still used as an upper limit for xl mem-set. Also note that calling xl mem-set will reset this value." That wouldn't be true anymore with this patch.
Weird. I did modify that man page, but obviously didn't check it was really added to the patch. Sorry for that, will resend the patch with that change included. Juergen
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