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| author | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2012-08-21 14:31:24 -0400 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2012-08-21 14:45:33 -0400 |
| commit | 806c312e50f122c47913145cf884f53dd09d9199 (patch) | |
| tree | c6d64ccc297c5f8e9a2959365d74c877cde93894 /arch/x86/xen/p2m.c | |
| parent | 59b294403e9814e7c1154043567f0d71bac7a511 (diff) | |
| download | linux-806c312e50f122c47913145cf884f53dd09d9199.tar.bz2 | |
xen/x86: Workaround 64-bit hypervisor and 32-bit initial domain.
If a 64-bit hypervisor is booted with a 32-bit initial domain,
the hypervisor deals with the initial domain as "compat" and
does some extra adjustments (like pagetables are 4 bytes instead
of 8). It also adjusts the xen_start_info->pt_base incorrectly.
When booted with a 32-bit hypervisor (32-bit initial domain):
..
(XEN) Start info: cf831000->cf83147c
(XEN) Page tables: cf832000->cf8b5000
..
[ 0.000000] PT: cf832000 (f832000)
[ 0.000000] Reserving PT: f832000->f8b5000
And with a 64-bit hypervisor:
(XEN) Start info: 00000000cf831000->00000000cf8314b4
(XEN) Page tables: 00000000cf832000->00000000cf8b6000
[ 0.000000] PT: cf834000 (f834000)
[ 0.000000] Reserving PT: f834000->f8b8000
To deal with this, we keep keep track of the highest physical
address we have reserved via memblock_reserve. If that address
does not overlap with pt_base, we have a gap which we reserve.
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'arch/x86/xen/p2m.c')
0 files changed, 0 insertions, 0 deletions