linux-kernel - Re: [PATCH] arm64: Add KRYO{3,4}XX CPU cores to spectre-v2 safe list

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Message-ID: <20200116183121.GE22420@willie-the-truck>
Date:   Thu, 16 Jan 2020 18:31:22 +0000
From:   Will Deacon <will@...nel.org>
To:     Doug Anderson <dianders@...omium.org>
Cc:     Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>,
        Jeffrey Hugo <jhugo@...eaurora.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Marc Zyngier <maz@...nel.org>,
        Andre Przywara <andre.przywara@....com>,
        Mark Rutland <mark.rutland@....com>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        James Morse <james.morse@....com>
Subject: Re: [PATCH] arm64: Add KRYO{3,4}XX CPU cores to spectre-v2 safe list

On Thu, Jan 16, 2020 at 10:27:08AM -0800, Doug Anderson wrote:
> On Thu, Jan 16, 2020 at 8:11 AM Sai Prakash Ranjan
> <saiprakash.ranjan@...eaurora.org> wrote:
> > On 2020-01-16 21:02, Will Deacon wrote:
> > > On Thu, Jan 16, 2020 at 07:49:12PM +0530, Sai Prakash Ranjan wrote:
> > >> KRYO3XX silver CPU cores and KRYO4XX silver, gold CPU cores
> > >> are not affected by Spectre variant 2. Add them to spectre_v2
> > >> safe list to correct ARM_SMCCC_ARCH_WORKAROUND_1 warning and
> > >> vulnerability sysfs value.
> > >>
> > >> Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
> > >> ---
> > >>  arch/arm64/include/asm/cputype.h | 6 ++++++
> > >>  arch/arm64/kernel/cpu_errata.c   | 3 +++
> > >>  2 files changed, 9 insertions(+)
> > >>
> > >> diff --git a/arch/arm64/include/asm/cputype.h
> > >> b/arch/arm64/include/asm/cputype.h
> > >> index aca07c2f6e6e..7219cddeba66 100644
> > >> --- a/arch/arm64/include/asm/cputype.h
> > >> +++ b/arch/arm64/include/asm/cputype.h
> > >> @@ -85,6 +85,9 @@
> > >>  #define QCOM_CPU_PART_FALKOR_V1             0x800
> > >>  #define QCOM_CPU_PART_FALKOR                0xC00
> > >>  #define QCOM_CPU_PART_KRYO          0x200
> > >> +#define QCOM_CPU_PART_KRYO_3XX_SILVER       0x803
> > >> +#define QCOM_CPU_PART_KRYO_4XX_GOLD 0x804
> > >> +#define QCOM_CPU_PART_KRYO_4XX_SILVER       0x805
> > >
> > > Jeffrey is the only person I know who understands the CPU naming here,
> > > so
> > > I've added him in case this needs either renaming or extending to cover
> > > other CPUs. I wouldn't be at all surprised if we need a function call
> > > rather than a bunch of table entries...
> > >
> > > That said, the internet claims that KRYO4XX gold is based on
> > > Cortex-A76,
> > > and so CSV2 should be set...
> > >
> >
> > Yes the internet claims are true and CSV2 is set. SANITY check logs in
> > here show ID_PFR0_EL1 - https://lore.kernel.org/patchwork/patch/1138457/
> 
> I'm probably just being a noob here and am confused, but if CSV2 is
> set then why do you need your patch at all?  The code I see says that
> if CSV2 is set then we don't even check the spectre_v2_safe_list().

You're not being a noob at all -- you're making the same point that I was
trying to make :)

So I think we can take this patch with the KRYO_4XX_GOLD part dropped.

Will