On 14/12/13 03:28, Neel Natu wrote:
> Hi John,
> On Fri, Dec 13, 2013 at 2:09 PM, John Baldwin <j...@freebsd.org> wrote:
>> On Thursday, December 12, 2013 4:00:08 pm Neel Natu wrote:
>>> Hi John,
>>> On Thu, Dec 12, 2013 at 12:11 PM, John Baldwin <j...@freebsd.org> wrote:
>>>> If I suspend and resume my laptop and then try to start a guest after the
>>>> resume, I get an odd panic. It generates a privileged instruction fault
>>>> kernel mode) for 'vmclear'. I've checked CR4 and it claims that VMXE is
>>>> I dont have any other ideas off the top of my head on what I should be
>>>> at? It looks like we read a bunch of MSRs in vmx_init(), but we don't
>>>> to them, and all vmx_enable() does on each CPU is set VMXE in CR4 from
>>>> what I
>>>> can tell.
>>> It also does a "vmxon" on each logical cpu which may also need to be
>>> done after a resume.
>> Ah, yes it does. That was sufficient both for starting a new guest after
>> resume and even doing a suspend/resume while a guest was active (and the
>> guest continued to run fine). I have a hacky patch for this. One, it
>> includes both a suspend and resume hook for VMM, though for my testing I only
>> needed a resume hook to invoke vmxon. Second, the name of vmx_resume2()
>> is a total hack (because vmx_resume() was already taken. I think for now
>> if I were to commit this, I'd just add the resme hook and maybe call the
>> Intel method vmx_reset() or vmx_restore()?
> There seems to be a race after the APs are restarted and before
> 'vmm_resume_p()' where it would be problematic to execute a VMX
> Perhaps we should enable VMX on each cpu before they return to the
> interrupted code?
Can you use the hook in cpususpend_handler? It's cpu_ops.cpu_resume, and
gets called on each CPU before returning from the handler.
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