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3bc38cbceb
linux/arch/x86/xen
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David Vrabel 3bc38cbceb x86/xen: do not identity map UNUSABLE regions in the machine E820 
If there are UNUSABLE regions in the machine memory map, dom0 will
attempt to map them 1:1 which is not permitted by Xen and the kernel
will crash.

There isn't anything interesting in the UNUSABLE region that the dom0
kernel needs access to so we can avoid making the 1:1 mapping and
treat it as RAM.

We only do this for dom0, as that is where tboot case shows up.
A PV domU could have an UNUSABLE region in its pseudo-physical map
and would need to be handled in another patch.

This fixes a boot failure on hosts with tboot.

tboot marks a region in the e820 map as unusable and the dom0 kernel
would attempt to map this region and Xen does not permit unusable
regions to be mapped by guests.

  (XEN)  0000000000000000 - 0000000000060000 (usable)
  (XEN)  0000000000060000 - 0000000000068000 (reserved)
  (XEN)  0000000000068000 - 000000000009e000 (usable)
  (XEN)  0000000000100000 - 0000000000800000 (usable)
  (XEN)  0000000000800000 - 0000000000972000 (unusable)

tboot marked this region as unusable.

  (XEN)  0000000000972000 - 00000000cf200000 (usable)
  (XEN)  00000000cf200000 - 00000000cf38f000 (reserved)
  (XEN)  00000000cf38f000 - 00000000cf3ce000 (ACPI data)
  (XEN)  00000000cf3ce000 - 00000000d0000000 (reserved)
  (XEN)  00000000e0000000 - 00000000f0000000 (reserved)
  (XEN)  00000000fe000000 - 0000000100000000 (reserved)
  (XEN)  0000000100000000 - 0000000630000000 (usable)

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
[v1: Altered the patch and description with domU's with UNUSABLE regions]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2013-08-20 09:46:06 -04:00
..
apic.c xen/apic/xenbus/swiotlb/pcifront/grant/tmem: Make functions or variables static. 2012-08-21 14:50:03 -04:00
debugfs.c debugfs: Add support to print u32 array in debugfs 2012-04-17 00:18:36 -04:00
debugfs.h debugfs: Add support to print u32 array in debugfs 2012-04-17 00:18:36 -04:00
enlighten.c Bug-fixes: 2013-05-11 16:19:30 -07:00
grant-table.c Merge commit 'v3.2-rc3' into stable/for-linus-3.3 2011-12-20 17:01:18 -05:00
irq.c xen/arm: receive Xen events on ARM 2012-09-14 13:37:32 +00:00
Kconfig x86: Make Linux guest support optional 2013-03-04 13:14:25 -08:00
Makefile xen/x86: Implement x86_apic_ops 2012-05-01 14:50:33 -04:00
mmu.c Merge branch 'x86-kaslr-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-04-30 08:37:24 -07:00
mmu.h xen: make a pile of mmu pvop functions static 2011-05-20 14:25:24 -07:00
multicalls.c xen/multicall: move *idx fields to start of mc_buffer 2011-07-18 15:43:46 -07:00
multicalls.h xen: use this_cpu_xxx replace percpu_xxx funcs 2012-01-24 12:20:24 -05:00
p2m.c Features: 2012-10-02 22:09:10 -07:00
pci-swiotlb-xen.c Merge branch 'stable/late-swiotlb.v3.3' into stable/for-linus-3.7 2012-09-22 20:01:24 -04:00
platform-pci-unplug.c xen/apic/xenbus/swiotlb/pcifront/grant/tmem: Make functions or variables static. 2012-08-21 14:50:03 -04:00
setup.c x86/xen: do not identity map UNUSABLE regions in the machine E820 2013-08-20 09:46:06 -04:00
smp.c xen/smp: Don't leak interrupt name when offlining. 2013-06-10 08:43:32 -04:00
smp.h xen: Clean up apic ipi interface 2013-05-29 09:04:21 -04:00
spinlock.c xen/spinlock: Don't leak interrupt name when offlining. 2013-06-10 08:43:33 -04:00
suspend.c Revert "xen PVonHVM: use E820_Reserved area for shared_info" 2013-02-14 21:29:31 -05:00
time.c xen/time: remove blocked time accounting from xen "clockchip" 2013-06-28 12:11:39 -04:00
trace.c xen/trace: Fix compile error when CONFIG_XEN_PRIVILEGED_GUEST is not set 2011-08-05 09:43:02 -04:00
vdso.h
vga.c xen/vga: add the xen EFI video mode support 2012-09-24 09:28:57 -04:00
xen-asm_32.S x86/xen: don't assume %ds is usable in xen_iret for 32-bit PVOPS. 2013-02-13 15:40:30 -05:00
xen-asm_64.S xen: use iret for return from 64b kernel to 32b usermode 2009-12-03 11:14:54 -08:00
xen-asm.h xen: make direct versions of irq_enable/disable/save/restore to common code 2009-02-04 16:59:04 -08:00
xen-asm.S xen: correctly check for pending events when restoring irq flags 2012-04-27 16:04:21 -04:00
xen-head.S xen/perf: Define .glob for the different hypercalls. 2012-07-30 14:27:48 -04:00
xen-ops.h Revert "xen PVonHVM: use E820_Reserved area for shared_info" 2013-02-14 21:29:31 -05:00