From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Alex Braunegg" <alex.braunegg@gmail.com>
Subject: Re: [BUG} libxl.c:5947:libxl_send_trigger: Send trigger
	'reset' failed: Function not implemented
Date: Wed, 10 Feb 2016 11:51:05 +1100
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To: 'Ian Campbell' <ian.campbell@citrix.com>, xen-devel@lists.xen.org
Cc: 'Ian Jackson' <Ian.Jackson@eu.citrix.com>, 'Wei Liu' <wei.liu2@citrix.com>, 'Jan Beulich' <JBeulich@suse.com>, 'Andrew Cooper' <Andrew.Cooper3@citrix.com>
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Many thanks for the detailed information and analysis - so potentially chasing something that cannot occur to a guest if the Windows PV Drivers are not installed.

> You might want to change this now. ;-)

No issue there - the guest was destroyed after grabbing the debug details. The full .cfg might be useful for someone else down the track.

> I'd strongly recommend installing some PV drivers into the guest, 

So this leads to another question. Is there a mechanism that exists today that allows via xl or some other Xen tool to 'probe' the guest as to if the PV drivers are loaded?

If not - it appears that:

	xc_hvm_param_get(ctx->xch, domid, HVM_PARAM_CALLBACK_IRQ, &pvdriver);

would get a return value that would equate to if the PV drivers are loaded / PV is able to be communicated with.

In list_vm(void), something such as (as part of the cmd line 'xl vm-list':

	uint64_t pvdriver = 0;
	int pv_available;
	pv_available = xc_hvm_param_get(ctx, info[i].domid, HVM_PARAM_CALLBACK_IRQ, &pvdriver);

to extend:	

	printf(LIBXL_UUID_FMT "  %d    %-30s\t%d\n", LIBXL_UUID_BYTES(info[i].uuid),info[i].domid, domname, pv_available);

Including ' xenctrl.h' in xl_cmdimpl.c would also be needed so that the function 'xc_hvm_param_get' could be used.

I am yet to test / try this but any suggestions is greatly appreciated.

Best regards,

Alex