linux-kernel - Re: [PATCH v3 06/12] KVM: arm64: selftests: Add support to disable and enable local IRQs

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Date:   Wed, 1 Sep 2021 23:26:52 +0000
From:   Oliver Upton <oupton@...gle.com>
To:     Raghavendra Rao Ananta <rananta@...gle.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>, Marc Zyngier <maz@...nel.org>,
        James Morse <james.morse@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Peter Shier <pshier@...gle.com>,
        Ricardo Koller <ricarkol@...gle.com>,
        Reiji Watanabe <reijiw@...gle.com>,
        Jing Zhang <jingzhangos@...gle.com>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH v3 06/12] KVM: arm64: selftests: Add support to disable
 and enable local IRQs

On Wed, Sep 01, 2021 at 09:14:06PM +0000, Raghavendra Rao Ananta wrote:
> Add functions local_irq_enable() and local_irq_disable() to
> enable and disable the IRQs from the guest, respectively.
> 
> Signed-off-by: Raghavendra Rao Ananta <rananta@...gle.com>

Reviewed-by: Oliver Upton <oupton@...gle.com>

> ---
>  .../testing/selftests/kvm/include/aarch64/processor.h  | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/tools/testing/selftests/kvm/include/aarch64/processor.h b/tools/testing/selftests/kvm/include/aarch64/processor.h
> index 78df059dc974..c35bb7b8e870 100644
> --- a/tools/testing/selftests/kvm/include/aarch64/processor.h
> +++ b/tools/testing/selftests/kvm/include/aarch64/processor.h
> @@ -241,4 +241,14 @@ static __always_inline u32 __raw_readl(const volatile void *addr)
>  #define writel(v,c)		({ __iowmb(); writel_relaxed((v),(c));})
>  #define readl(c)		({ u32 __v = readl_relaxed(c); __iormb(__v); __v; })
>  
> +static inline void local_irq_enable(void)
> +{
> +	asm volatile("msr daifclr, #3" : : : "memory");
> +}
> +
> +static inline void local_irq_disable(void)
> +{
> +	asm volatile("msr daifset, #3" : : : "memory");
> +}
> +
>  #endif /* SELFTEST_KVM_PROCESSOR_H */
> -- 
> 2.33.0.153.gba50c8fa24-goog
>