Subject: Re: [PATCH] KVM: PPC: Book3S HV: Add H_FAC_UNAVAIL mapping for tracing exits

From: Ritesh Harjani (IBM) <[email-masked]>
Date: Mon, 27 Apr 2026 06:00:46 +0530

Gautam Menghani <[email-masked]> writes:

> From: Gautam Menghani <[email-masked]>
>
> The macro kvm_trace_symbol_exit is used for providing the mappings
> for the trap vectors and their names. Add mapping for H_FAC_UNAVAIL so that
> trap reason is displayed as string instead of a vector number when using
> the kvm_guest_exit tracepoint.
>
> Signed-off-by: Gautam Menghani <[email-masked]>
> ---
>  arch/powerpc/kvm/trace_book3s.h | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/arch/powerpc/kvm/trace_book3s.h b/arch/powerpc/kvm/trace_book3s.h
> index 9260ddbd557f..eafbaeb5a9db 100644
> --- a/arch/powerpc/kvm/trace_book3s.h
> +++ b/arch/powerpc/kvm/trace_book3s.h
> @@ -28,6 +28,7 @@
>  	{0xea0, "H_VIRT"}, \
>  	{0xf00, "PERFMON"}, \
>  	{0xf20, "ALTIVEC"}, \
> -	{0xf40, "VSX"}
> +	{0xf40, "VSX"}, \
> +	{0xf80, "H_FAC_UNAVAIL"},

So I ended up looking into other trace_symbols too and I don't think we
should have a trailing comma here. It may cause some issues silently in
trace-cmd or other places. I remember going through it when I was doing
some other tracing work earlier but I don't recollect it now.

Can we just remove the trailing comma and send a v2 please?

btw, 0XF80 is correct as per "arch/powerpc/include/asm/kvm_asm.h"

#define BOOK3S_INTERRUPT_H_FAC_UNAVAIL	0xf80

-ritesh