Re: [Xen-devel] [PATCH] xen/hvm: If we fail to fetch an HVMparameter print out which flag it is.

[Konrad Rzeszutek Wilk]

On Tue, Oct 23, 2012 at 10:22:18AM +0100, Ian Campbell wrote:
> On Fri, 2012-10-19 at 20:03 +0100, Konrad Rzeszutek Wilk wrote:
> > Makes it easier to troubleshoot in the field.
> > 
> > Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> > ---
> >  include/xen/hvm.h |   31 +++++++++++++++++++++++++++++--
> >  1 files changed, 29 insertions(+), 2 deletions(-)
> > 
> > diff --git a/include/xen/hvm.h b/include/xen/hvm.h
> > index b193fa2..c2a4238 100644
> > --- a/include/xen/hvm.h
> > +++ b/include/xen/hvm.h
> > @@ -5,6 +5,33 @@
> >  #include <xen/interface/hvm/params.h>
> >  #include <asm/xen/hypercall.h>
> >  
> > +static const char *param_name(int op)
> > +{
> > +	static const char *const names[] = {
> 
> #define PARAM(x) [x] = STRINGIFY(x)
> would save from typos due to doubling everything up.
> 
> Or even:
> #define PARAM(x) [HVM_PARAM#_x] STRINGIFY(x)
> 
> > +		[HVM_PARAM_CALLBACK_IRQ] = "HVM_PARAM_CALLBACK_IRQ",
> > +		[HVM_PARAM_STORE_PFN] = "HVM_PARAM_STORE_PFN",
> > +		[HVM_PARAM_STORE_EVTCHN] = "HVM_PARAM_STORE_EVTCHN",
> > +		[HVM_PARAM_PAE_ENABLED] = "HVM_PARAM_PAE_ENABLED",
> > +		[HVM_PARAM_IOREQ_PFN] = "HVM_PARAM_IOREQ_PFN",
> > +		[HVM_PARAM_BUFIOREQ_PFN] = "HVM_PARAM_BUFIOREQ_PFN",
> > +		[HVM_PARAM_TIMER_MODE] = "HVM_PARAM_TIMER_MODE",
> > +		[HVM_PARAM_HPET_ENABLED] = "HVM_PARAM_HPET_ENABLED",
> > +		[HVM_PARAM_IDENT_PT] = "HVM_PARAM_IDENT_PT",
> > +		[HVM_PARAM_DM_DOMAIN] = "HVM_PARAM_DM_DOMAIN",
> > +		[HVM_PARAM_ACPI_S_STATE] = "HVM_PARAM_ACPI_S_STATE",
> > +		[HVM_PARAM_VM86_TSS] = "HVM_PARAM_VM86_TSS",
> > +		[HVM_PARAM_VPT_ALIGN] = "HVM_PARAM_VPT_ALIGN",
> > +		[HVM_PARAM_CONSOLE_PFN] = "HVM_PARAM_CONSOLE_PFN",
> > +		[HVM_PARAM_CONSOLE_EVTCHN] = "HVM_PARAM_CONSOLE_EVTCHN" };
> 
> You probably want a , and a newline before the }.
> 
> > +
> > +	if (op >= ARRAY_SIZE(names))
> > +		return "unknown";
> > +
> > +	if (!names[op])
> > +		return "reserved";
> > +
> > +	return names[op];
> > +}
> >  static inline int hvm_get_parameter(int idx, uint64_t *value)
> >  {
> >  	struct xen_hvm_param xhv;
> > @@ -14,8 +41,8 @@ static inline int hvm_get_parameter(int idx, uint64_t *value)
> >  	xhv.index = idx;
> >  	r = HYPERVISOR_hvm_op(HVMOP_get_param, &xhv);
> >  	if (r < 0) {
> > -		printk(KERN_ERR "Cannot get hvm parameter %d: %d!\n",
> > -			idx, r);
> > +		printk(KERN_ERR "Cannot get hvm parameter %s (%d): %d!\n",
> > +			param_name(idx), idx, r);
> >  		return r;
> >  	}
> >  	*value = xhv.value;

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