[Xen-devel] Re: [PATCH][HVM] Inject #GP for un-emulated instructions rather than crash guest

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

Okay, but would #UD be a better exception to deliver in this case? Less
overloaded than #GP and more appropriate?

 -- Keir

On 27/11/07 04:37, "Cui, Dexuan" <dexuan.cui@xxxxxxxxx> wrote:

> The CrashMe stress test (a process repeatedly forks child processes, and
> the child processes initialize a buffer with random numbers, then treat
> the buffer as code, and execute it) can crash 32-bit HVM RHEL5.1 guest
> easily; this is because we haven't emulated all the instructions in
> handle_mmio() yet.
> 
> The CrashMe process runs with root rights, and can access MMIO space in
> an unknown way ("strace -f" shows the random codes running at CPL=3
> don't call mmap(), and don't open any special files in /dev/ "); the gpa
> may look like 0xa**** or  0xb****, or 0xfee0****.
> After running CrashMe for several hours, I have found 24 un-emulated
> instructions may be hit...
> 
> This patch may serve as a workaround.
> 
> Signed-off-by: Dexuan Cui <dexuan.cui@xxxxxxxxx>
> 



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