[RFT] Possible fix for 32-bit guests

[RFT] Possible fix for 32-bit guests

[Avi Kivity]

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Attached is a patch that fixes problems with 32-bit guests on 64-bit 
hosts.  For example, I got damn small linux 0.4.10 to boot with this; 
previously it segfaulted during init.

If you have issues with 32-bit guests, please test with this patch and 
report.  Even if you don't have any issues, testing your usual guests is 
appreciated.

-- 
error compiling committee.c: too many arguments to function


[-- Attachment #2: kvm-bitop-fix.patch --]
[-- Type: text/x-patch, Size: 624 bytes --]

diff --git a/drivers/kvm/x86_emulate.c b/drivers/kvm/x86_emulate.c
index 7513cdd..daff430 100644
--- a/drivers/kvm/x86_emulate.c
+++ b/drivers/kvm/x86_emulate.c
@@ -832,10 +832,8 @@ done_prefixes:
 		dst.type = OP_MEM;
 		dst.ptr = (unsigned long *)cr2;
 		dst.bytes = (d & ByteOp) ? 1 : op_bytes;
-		if (d & BitOp) {
-			dst.ptr += src.val / BITS_PER_LONG;
-			dst.bytes = sizeof(long);
-		}
+		if (d & BitOp)
+			dst.ptr += src.val / (dst.bytes * 8);
 		if (!(d & Mov) && /* optimisation - avoid slow emulated read */
 		    ((rc = ops->read_emulated((unsigned long)dst.ptr,
 					      &dst.val, dst.bytes, ctxt)) != 0))

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