From: Chris (Christopher) Brand Date: Thu, 23 Jul 2015 16:31:56 +0000 (+0000) Subject: xen: arm: Document xenheap_megabytes limitation X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~2699 X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=a7da1081d1ee403464ce1f4fbda5c084cfb868df;p=xen.git xen: arm: Document xenheap_megabytes limitation In setup_mm(), the value passed as xenheap_megabytes gets converted to pages and passed to setup_xenheap_mappings(), which in turn passes it to create_32mb_mappings(), which contains an ASSERT that the value passed is a multiple of 32MB. So specifying any value that is not an integer multiple of 32 will cause Xen to hit this assert and fail to boot. Signed-off-by: Chris Brand Reviewed-by: Julien Grall Acked-by: Ian Campbell --- diff --git a/docs/misc/xen-command-line.markdown b/docs/misc/xen-command-line.markdown index 70d7ab8234..a1bca2b35f 100644 --- a/docs/misc/xen-command-line.markdown +++ b/docs/misc/xen-command-line.markdown @@ -242,7 +242,7 @@ the NMI watchdog is also enabled. > Default: `0` (1/32 of RAM) -Amount of RAM to set aside for the Xenheap. +Amount of RAM to set aside for the Xenheap. Must be an integer multiple of 32. By default will use 1/32 of the RAM up to a maximum of 1GB and with a minimum of 32M, subject to a suitably aligned and sized contiguous