linux-kernel - Re: [PATCH v5 1/2] perf,kvm/ppc: Add kvm

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Message-ID: <1437077417.2993.108.camel@freescale.com>
Date:	Thu, 16 Jul 2015 15:10:17 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	Hemant Kumar <hemant@...ux.vnet.ibm.com>
CC:	<linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>,
	<acme@...nel.org>, <mingo@...nel.org>, <mpe@...erman.id.au>,
	<sukadev@...ux.vnet.ibm.com>, <maddy@...ux.vnet.ibm.com>,
	<warrier@...ux.vnet.ibm.com>, <srikar@...ux.vnet.ibm.com>,
	<paulus@...ba.org>
Subject: Re: [PATCH v5 1/2] perf,kvm/ppc: Add kvm_perf.h for powerpc

On Thu, 2015-07-16 at 21:18 +0530, Hemant Kumar wrote:
> To analyze the exit events with perf, we need kvm_perf.h to be added in
> the arch/powerpc directory, where the kvm tracepoints needed to trace
> the KVM exit events are defined.
> 
> This patch adds "kvm_perf_book3s.h" to indicate that the tracepoints are
> book3s specific. Generic "kvm_perf.h" then can just include
> "kvm_perf_book3s.h".
> 
> Signed-off-by: Hemant Kumar <hemant@...ux.vnet.ibm.com>
> ---
> Changes:
> - Not exporting the exit reasons compared to previous patchset (suggested 
> by Paul)
> 
>  arch/powerpc/include/uapi/asm/kvm_perf.h        |  6 ++++++
>  arch/powerpc/include/uapi/asm/kvm_perf_book3s.h | 14 ++++++++++++++
>  2 files changed, 20 insertions(+)
>  create mode 100644 arch/powerpc/include/uapi/asm/kvm_perf.h
>  create mode 100644 arch/powerpc/include/uapi/asm/kvm_perf_book3s.h
> 
> diff --git a/arch/powerpc/include/uapi/asm/kvm_perf.h 
> b/arch/powerpc/include/uapi/asm/kvm_perf.h
> new file mode 100644
> index 0000000..5ed2ff3
> --- /dev/null
> +++ b/arch/powerpc/include/uapi/asm/kvm_perf.h
> @@ -0,0 +1,6 @@
> +#ifndef _ASM_POWERPC_KVM_PERF_H
> +#define _ASM_POWERPC_KVM_PERF_H
> +
> +#include <asm/kvm_perf_book3s.h>
> +
> +#endif
> diff --git a/arch/powerpc/include/uapi/asm/kvm_perf_book3s.h 
> b/arch/powerpc/include/uapi/asm/kvm_perf_book3s.h
> new file mode 100644
> index 0000000..8c8d8c2
> --- /dev/null
> +++ b/arch/powerpc/include/uapi/asm/kvm_perf_book3s.h
> @@ -0,0 +1,14 @@
> +#ifndef _ASM_POWERPC_KVM_PERF_BOOK3S_H
> +#define _ASM_POWERPC_KVM_PERF_BOOK3S_H
> +
> +#include <asm/kvm.h>
> +
> +#define DECODE_STR_LEN 20
> +
> +#define VCPU_ID "vcpu_id"
> +
> +#define KVM_ENTRY_TRACE "kvm_hv:kvm_guest_enter"
> +#define KVM_EXIT_TRACE "kvm_hv:kvm_guest_exit"
> +#define KVM_EXIT_REASON "trap"
> +
> +#endif /* _ASM_POWERPC_KVM_PERF_BOOK3S_H */

Again, why is book3s stuff being presented via uapi as generic 
<asm/kvm_perf.h> with generic symbol names?

-Scott

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