From: Fuad Tabba <tabba@google.com>
To: Kalesh Singh <kaleshsingh@google.com>
Cc: maz@kernel.org, mark.rutland@arm.com, broonie@kernel.org,
madvenka@linux.microsoft.com, will@kernel.org,
qperret@google.com, james.morse@arm.com,
alexandru.elisei@arm.com, suzuki.poulose@arm.com,
catalin.marinas@arm.com, andreyknvl@gmail.com,
vincenzo.frascino@arm.com, mhiramat@kernel.org, ast@kernel.org,
wangkefeng.wang@huawei.com, elver@google.com, keirf@google.com,
yuzenghui@huawei.com, ardb@kernel.org, oupton@google.com,
linux-arm-kernel@lists.infradead.org,
kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org,
kernel-team@android.com
Subject: Re: [PATCH v5 08/17] KVM: arm64: Add PROTECTED_NVHE_STACKTRACE Kconfig
Date: Thu, 21 Jul 2022 10:57:44 +0100 [thread overview]
Message-ID: <CA+EHjTxtwjf3dMhrBFa0iTMPayV0V0dM-z_Gk_hSQn_hr4zYow@mail.gmail.com> (raw)
In-Reply-To: <20220721055728.718573-9-kaleshsingh@google.com>
Hi Kalesh,
On Thu, Jul 21, 2022 at 6:57 AM Kalesh Singh <kaleshsingh@google.com> wrote:
>
> This can be used to disable stacktrace for the protected KVM
> nVHE hypervisor, in order to save on the associated memory usage.
>
> This option is disabled by default, since protected KVM is not widely
> used on platforms other than Android currently.
>
> Signed-off-by: Kalesh Singh <kaleshsingh@google.com>
> ---
Just wanted to point out that I have specifically tested this as well,
enabling PROTECTED_NVHE_STACKTRACE but not NVHE_EL2_DEBUG. Works as
expected.
Tested-by: Fuad Tabba <tabba@google.com>
Reviewed-by: Fuad Tabba <tabba@google.com>
Cheers,
/fuad
>
> Changes in v5:
> - Make PROTECTED_NVHE_STACKTRACE depend on NVHE_EL2_DEBUG, per Marc
>
> arch/arm64/kvm/Kconfig | 15 +++++++++++++++
> 1 file changed, 15 insertions(+)
>
> diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig
> index 8a5fbbf084df..09c995869916 100644
> --- a/arch/arm64/kvm/Kconfig
> +++ b/arch/arm64/kvm/Kconfig
> @@ -46,6 +46,21 @@ menuconfig KVM
>
> If unsure, say N.
>
> +config PROTECTED_NVHE_STACKTRACE
> + bool "Protected KVM hypervisor stacktraces"
> + depends on NVHE_EL2_DEBUG
> + default n
> + help
> + Say Y here to enable pKVM hypervisor stacktraces on hyp_panic()
> +
> + If you are not using protected nVHE (pKVM), say N.
> +
> + If using protected nVHE mode, but cannot afford the associated
> + memory cost (less than 0.75 page per CPU) of pKVM stacktraces,
> + say N.
> +
> + If unsure, say N.
> +
> config NVHE_EL2_DEBUG
> bool "Debug mode for non-VHE EL2 object"
> depends on KVM
> --
> 2.37.0.170.g444d1eabd0-goog
>
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next prev parent reply other threads:[~2022-07-21 10:00 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-21 5:57 [PATCH v5 00/17] KVM nVHE Hypervisor stack unwinder Kalesh Singh
2022-07-21 5:57 ` [PATCH v5 01/17] arm64: stacktrace: Add shared header for common stack unwinding code Kalesh Singh
2022-07-21 5:57 ` [PATCH v5 02/17] arm64: stacktrace: Factor out on_accessible_stack_common() Kalesh Singh
2022-07-21 5:57 ` [PATCH v5 03/17] arm64: stacktrace: Factor out unwind_next_common() Kalesh Singh
2022-07-21 5:57 ` [PATCH v5 04/17] arm64: stacktrace: Handle frame pointer from different address spaces Kalesh Singh
2022-07-21 9:57 ` Fuad Tabba
2022-07-21 5:57 ` [PATCH v5 05/17] arm64: stacktrace: Factor out common unwind() Kalesh Singh
2022-07-25 14:05 ` Mark Brown
2022-07-21 5:57 ` [PATCH v5 06/17] arm64: stacktrace: Add description of stacktrace/common.h Kalesh Singh
2022-07-21 9:57 ` Fuad Tabba
2022-07-21 5:57 ` [PATCH v5 07/17] KVM: arm64: On stack overflow switch to hyp overflow_stack Kalesh Singh
2022-07-21 5:57 ` [PATCH v5 08/17] KVM: arm64: Add PROTECTED_NVHE_STACKTRACE Kconfig Kalesh Singh
2022-07-21 9:57 ` Fuad Tabba [this message]
2022-07-21 5:57 ` [PATCH v5 09/17] KVM: arm64: Allocate shared pKVM hyp stacktrace buffers Kalesh Singh
2022-07-21 9:57 ` Fuad Tabba
2022-07-21 5:57 ` [PATCH v5 10/17] KVM: arm64: Stub implementation of pKVM HYP stack unwinder Kalesh Singh
2022-07-21 9:58 ` Fuad Tabba
2022-07-21 5:57 ` [PATCH v5 11/17] KVM: arm64: Stub implementation of non-protected nVHE " Kalesh Singh
2022-07-21 9:58 ` Fuad Tabba
2022-07-21 5:57 ` [PATCH v5 12/17] KVM: arm64: Save protected-nVHE (pKVM) hyp stacktrace Kalesh Singh
2022-07-21 9:58 ` Fuad Tabba
2022-07-22 15:33 ` Oliver Upton
2022-07-22 17:28 ` Kalesh Singh
2022-07-21 5:57 ` [PATCH v5 13/17] KVM: arm64: Prepare non-protected nVHE hypervisor stacktrace Kalesh Singh
2022-07-21 9:58 ` Fuad Tabba
2022-07-21 5:57 ` [PATCH v5 14/17] KVM: arm64: Implement protected nVHE hyp stack unwinder Kalesh Singh
2022-07-21 9:58 ` Fuad Tabba
2022-07-21 5:57 ` [PATCH v5 15/17] KVM: arm64: Implement non-protected " Kalesh Singh
2022-07-21 9:58 ` Fuad Tabba
2022-07-21 5:57 ` [PATCH v5 16/17] KVM: arm64: Introduce pkvm_dump_backtrace() Kalesh Singh
2022-07-21 9:59 ` Fuad Tabba
2022-07-22 11:16 ` Oliver Upton
2022-07-22 17:25 ` Kalesh Singh
2022-07-21 5:57 ` [PATCH v5 17/17] KVM: arm64: Introduce hyp_dump_backtrace() Kalesh Singh
2022-07-21 9:59 ` Fuad Tabba
2022-07-21 20:35 ` Oliver Upton
2022-07-22 0:01 ` Kalesh Singh
2022-07-21 9:55 ` [PATCH v5 00/17] KVM nVHE Hypervisor stack unwinder Fuad Tabba
2022-07-21 16:06 ` Kalesh Singh
2022-07-22 10:48 ` Oliver Upton
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