linux-kernel - Re: [PATCH v6 13/24] RISC-V: KVM: Implement SBI PMU Snapshot feature

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Message-ID: <20240415-74754b02ead9b89dcaef6d3a@orel>
Date: Mon, 15 Apr 2024 15:19:59 +0200
From: Andrew Jones <ajones@...tanamicro.com>
To: Atish Patra <atishp@...osinc.com>
Cc: linux-kernel@...r.kernel.org, Anup Patel <anup@...infault.org>, 
	Ajay Kaher <ajay.kaher@...adcom.com>, Albert Ou <aou@...s.berkeley.edu>, 
	Alexandre Ghiti <alexghiti@...osinc.com>, Alexey Makhalov <alexey.amakhalov@...adcom.com>, 
	Atish Patra <atishp@...shpatra.org>, 
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>, Conor Dooley <conor.dooley@...rochip.com>, 
	Juergen Gross <jgross@...e.com>, kvm-riscv@...ts.infradead.org, kvm@...r.kernel.org, 
	linux-kselftest@...r.kernel.org, linux-riscv@...ts.infradead.org, 
	Mark Rutland <mark.rutland@....com>, Palmer Dabbelt <palmer@...belt.com>, 
	Paolo Bonzini <pbonzini@...hat.com>, Paul Walmsley <paul.walmsley@...ive.com>, 
	Shuah Khan <shuah@...nel.org>, virtualization@...ts.linux.dev, Will Deacon <will@...nel.org>, 
	x86@...nel.org
Subject: Re: [PATCH v6 13/24] RISC-V: KVM: Implement SBI PMU Snapshot feature

On Wed, Apr 10, 2024 at 05:07:41PM -0700, Atish Patra wrote:
> PMU Snapshot function allows to minimize the number of traps when the
> guest access configures/access the hpmcounters. If the snapshot feature
> is enabled, the hypervisor updates the shared memory with counter
> data and state of overflown counters. The guest can just read the
> shared memory instead of trap & emulate done by the hypervisor.
> 
> This patch doesn't implement the counter overflow yet.
> 
> Reviewed-by: Anup Patel <anup@...infault.org>
> Signed-off-by: Atish Patra <atishp@...osinc.com>
> ---
>  arch/riscv/include/asm/kvm_vcpu_pmu.h |   7 ++
>  arch/riscv/kvm/vcpu_pmu.c             | 121 +++++++++++++++++++++++++-
>  arch/riscv/kvm/vcpu_sbi_pmu.c         |   3 +
>  3 files changed, 130 insertions(+), 1 deletion(-)
>

Reviewed-by: Andrew Jones <ajones@...tanamicro.com>