On 01/12/15 01:21, Tamas K Lengyel wrote: > > > On Mon, Nov 30, 2015 at 7:01 PM, Razvan Cojocaru > <rcojoc...@bitdefender.com <mailto:rcojoc...@bitdefender.com>> wrote: > > On 12/01/2015 01:32 AM, Tamas K Lengyel wrote: > > Hi all, > > I'm trying to extend the current vm_event system to be able to > emulate > > over an in-guest breakpoint using the > VM_EVENT_FLAG_SET_EMUL_READ_DATA > > feature. The idea is to have the vm_event listener send back the > > contents of the memory that was overwritten by the breakpoint > > instruction, have Xen emulate one instruction, and resume execution > > normally afterwards. This would eliminate the need of removing the > > breakpoint, singlestepping, and placing the breakpoint back again. > > > > Unfortunately I encounter this crash when I call > > hvm_mem_access_emulate_one in the event response handler: > > > > (XEN) vm_event.c:72:d0v0 Checking flags on int3 response 37 > > (XEN) Xen BUG at /share/src/xen/xen/include/asm/hvm/vmx/vmx.h:372 >
This BUG() is the cause of the crash. It is a bad parameter to VMREAD, by the looks of it. ~Andrew
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