linux-kernel - Re: [PATCHv2] perf kvm: add kvm-stat for arm64

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Message-ID: <20200915111541.GB604@jagdpanzerIV.localdomain>
Date:   Tue, 15 Sep 2020 20:15:41 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:     Leo Yan <leo.yan@...aro.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Will Deacon <will@...nel.org>,
        John Garry <john.garry@...wei.com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Suleiman Souhlal <suleiman@...gle.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Subject: Re: [PATCHv2] perf kvm: add kvm-stat for arm64

On (20/09/15 19:57), Sergey Senozhatsky wrote:
> On (20/09/15 18:36), Leo Yan wrote:
> > > +#define HVC_STUB_ERR		  0xbadca11
> > > +
> > > +/* Per asm/kvm_asm.h */
> > > +#define ARM_EXCEPTION_IRQ		0
> > > +#define ARM_EXCEPTION_EL1_SERROR	1
> > > +#define ARM_EXCEPTION_TRAP		2
> > > +#define ARM_EXCEPTION_IL		3
> >
> > Nitpick: from completeness, we also can give out KVM exiting reason
> > for 'ARM_EXCEPTION_IL'.
>
> OK, let me take a look.

I think ARM_EXCEPTION_IL are reported as HYP_GONE. According to
arch/arm64/include/asm/kvm_asm.h

---
#define ARM_EXCEPTION_IRQ	  0
#define ARM_EXCEPTION_EL1_SERROR  1
#define ARM_EXCEPTION_TRAP	  2
#define ARM_EXCEPTION_IL	  3

#define kvm_arm_exception_type					\
	{ARM_EXCEPTION_IRQ,		"IRQ"		},	\
	{ARM_EXCEPTION_EL1_SERROR, 	"SERROR"	},	\
	{ARM_EXCEPTION_TRAP, 		"TRAP"		},	\
	{ARM_EXCEPTION_HYP_GONE,	"HYP_GONE"	}
---

So it should be reported already.

	-ss