svn commit: r282284 - head/sys/amd64/vmm
Neel Natu
neel at FreeBSD.org
Thu Apr 30 21:00:48 UTC 2015
Author: neel
Date: Thu Apr 30 21:00:47 2015
New Revision: 282284
URL: https://svnweb.freebsd.org/changeset/base/282284
Log:
When an instruction cannot be decoded just return to userspace so bhyve(8)
can dump the instruction bytes.
Requested by: grehan
MFC after: 1 week
Modified:
head/sys/amd64/vmm/vmm.c
Modified: head/sys/amd64/vmm/vmm.c
==============================================================================
--- head/sys/amd64/vmm/vmm.c Thu Apr 30 20:50:42 2015 (r282283)
+++ head/sys/amd64/vmm/vmm.c Thu Apr 30 21:00:47 2015 (r282284)
@@ -1293,8 +1293,12 @@ vm_handle_inst_emul(struct vm *vm, int v
else if (error != 0)
panic("%s: vmm_fetch_instruction error %d", __func__, error);
- if (vmm_decode_instruction(vm, vcpuid, gla, cpu_mode, cs_d, vie) != 0)
- return (EFAULT);
+ if (vmm_decode_instruction(vm, vcpuid, gla, cpu_mode, cs_d, vie) != 0) {
+ VCPU_CTR1(vm, vcpuid, "Error decoding instruction at %#lx",
+ vme->rip + cs_base);
+ *retu = true; /* dump instruction bytes in userspace */
+ return (0);
+ }
/*
* If the instruction length was not specified then update it now
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