diff options
| author | Jan Kiszka <jan.kiszka@siemens.com> | 2010-12-27 15:58:23 +0100 |
|---|---|---|
| committer | Marcelo Tosatti <mtosatti@redhat.com> | 2011-01-21 14:05:22 -0200 |
| commit | 95c077c91900c1420cd4f0be996ffeea6fb6cec8 (patch) | |
| tree | 8e10e4964371a3b510cc0f10487327d47dcd8fce /target-i386 | |
| parent | 3980e3024b2d1677a9910de5e35d22d5d8392522 (diff) | |
kvm: x86: Prevent sign extension of DR7 in guest debugging mode
This unbreaks guest debugging when the 4th hardware breakpoint used for
guest debugging is a watchpoint of 4 or 8 byte lenght. The 31st bit of
DR7 is set in that case and used to cause a sign extension to the high
word which was breaking the guest state (vm entry failure).
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'target-i386')
| -rw-r--r-- | target-i386/kvm.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/target-i386/kvm.c b/target-i386/kvm.c index 7e5982b132..85edaccad1 100644 --- a/target-i386/kvm.c +++ b/target-i386/kvm.c @@ -1686,7 +1686,7 @@ void kvm_arch_update_guest_debug(CPUState *env, struct kvm_guest_debug *dbg) dbg->arch.debugreg[n] = hw_breakpoint[n].addr; dbg->arch.debugreg[7] |= (2 << (n * 2)) | (type_code[hw_breakpoint[n].type] << (16 + n*4)) | - (len_code[hw_breakpoint[n].len] << (18 + n*4)); + ((uint32_t)len_code[hw_breakpoint[n].len] << (18 + n*4)); } } /* Legal xcr0 for loading */ |