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xen64: implement failsafe callback

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Implement the failsafe callback, so that iret and segment register
load exceptions are reported to the kernel.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Stephen Tweedie <sct@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jeremy Fitzhardinge 2008-07-08 15:07:09 -07:00 committed by Ingo Molnar
parent 0775b3dbcb
commit 4a5c3e77f7
1 changed files with 9 additions and 7 deletions
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16
arch/x86/kernel/entry_64.S
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@ -1365,10 +1365,8 @@ END(do_hypervisor_callback)
# with its current contents: any discrepancy means we in category 1.
*/
ENTRY(xen_failsafe_callback)
#if 1
ud2a
#else
_frame (RIP-0x30)
framesz = (RIP-0x30) /* workaround buggy gas */
_frame framesz
CFI_REL_OFFSET rcx, 0
CFI_REL_OFFSET r11, 8
movw %ds,%cx
@ -1391,8 +1389,13 @@ ENTRY(xen_failsafe_callback)
CFI_RESTORE r11
addq $0x30,%rsp
CFI_ADJUST_CFA_OFFSET -0x30
movq $11,%rdi /* SIGSEGV */
jmp do_exit
pushq $0
CFI_ADJUST_CFA_OFFSET 8
pushq %r11
CFI_ADJUST_CFA_OFFSET 8
pushq %rcx
CFI_ADJUST_CFA_OFFSET 8
jmp general_protection
CFI_RESTORE_STATE
1: /* Segment mismatch => Category 1 (Bad segment). Retry the IRET. */
movq (%rsp),%rcx
@ -1406,7 +1409,6 @@ ENTRY(xen_failsafe_callback)
SAVE_ALL
jmp error_exit
CFI_ENDPROC
#endif
END(xen_failsafe_callback)
#endif /* CONFIG_XEN */