linux-kernel - Re: [PATCH v2] KVM: arm64: Populate fault info for watchpoint

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Message-ID: <87o7m2jmfm.wl-maz@kernel.org>
Date:   Tue, 30 May 2023 08:41:33 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Akihiko Odaki <akihiko.odaki@...nix.com>
Cc:     James Morse <james.morse@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Oliver Upton <oliver.upton@...ux.dev>,
        Zenghui Yu <yuzenghui@...wei.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] KVM: arm64: Populate fault info for watchpoint

On Tue, 30 May 2023 03:46:51 +0100,
Akihiko Odaki <akihiko.odaki@...nix.com> wrote:
> 
> When handling ESR_ELx_EC_WATCHPT_LOW, far_el2 member of struct
> kvm_vcpu_fault_info will be copied to far member of struct
> kvm_debug_exit_arch and exposed to the userspace. The userspace will
> see stale values from older faults if the fault info does not get
> populated.
> 
> Fixes: 8fb2046180a0 ("KVM: arm64: Move early handlers to per-EC handlers")
> Suggested-by: Marc Zyngier <maz@...nel.org>
> Signed-off-by: Akihiko Odaki <akihiko.odaki@...nix.com>

Thanks for respining this quickly. I've added a Cc: stable as we need
to get this backported.

Cheers,

	M.

-- 
Without deviation from the norm, progress is not possible.