debuggers.hg

changeset 21116:19cc497863a4

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shadow: Don't crash xen if hvm_read() from paged or shared memory

There are two new return cases from hvm_copy_from_guest_virt() to deal
with paging or shared memory -- retry the emulation rather than
crash.

Signed-off-by: Steven Hand <steven.hand@cl.cam.ac.uk>
author Keir Fraser <keir.fraser@citrix.com>
date Fri Mar 26 08:48:08 2010 +0000 (2010-03-26)
parents 17fa3cd04361
children 415c0bf4ac7a
files xen/arch/x86/mm/shadow/common.c
line diff
     1.1 --- a/xen/arch/x86/mm/shadow/common.c	Fri Mar 26 08:45:45 2010 +0000
     1.2 +++ b/xen/arch/x86/mm/shadow/common.c	Fri Mar 26 08:48:08 2010 +0000
     1.3 @@ -180,6 +180,9 @@ hvm_read(enum x86_segment seg,
     1.4      case HVMCOPY_bad_gfn_to_mfn:
     1.5      case HVMCOPY_unhandleable:
     1.6          return X86EMUL_UNHANDLEABLE;
     1.7 +    case HVMCOPY_gfn_paged_out:
     1.8 +    case HVMCOPY_gfn_shared:
     1.9 +        return X86EMUL_RETRY;
    1.10      }
    1.11  
    1.12      BUG();