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

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

[Sai Prakash Ranjan]

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@codeaurora.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
 
 #define NVIDIA_CPU_PART_DENVER		0x003
 #define NVIDIA_CPU_PART_CARMEL		0x004
@@ -111,6 +114,9 @@
 #define MIDR_QCOM_FALKOR_V1 MIDR_CPU_MODEL(ARM_CPU_IMP_QCOM, QCOM_CPU_PART_FALKOR_V1)
 #define MIDR_QCOM_FALKOR MIDR_CPU_MODEL(ARM_CPU_IMP_QCOM, QCOM_CPU_PART_FALKOR)
 #define MIDR_QCOM_KRYO MIDR_CPU_MODEL(ARM_CPU_IMP_QCOM, QCOM_CPU_PART_KRYO)
+#define MIDR_QCOM_KRYO_3XX_SILVER MIDR_CPU_MODEL(ARM_CPU_IMP_QCOM, QCOM_CPU_PART_KRYO_3XX_SILVER)
+#define MIDR_QCOM_KRYO_4XX_GOLD MIDR_CPU_MODEL(ARM_CPU_IMP_QCOM, QCOM_CPU_PART_KRYO_4XX_GOLD)
+#define MIDR_QCOM_KRYO_4XX_SILVER MIDR_CPU_MODEL(ARM_CPU_IMP_QCOM, QCOM_CPU_PART_KRYO_4XX_SILVER)
 #define MIDR_NVIDIA_DENVER MIDR_CPU_MODEL(ARM_CPU_IMP_NVIDIA, NVIDIA_CPU_PART_DENVER)
 #define MIDR_NVIDIA_CARMEL MIDR_CPU_MODEL(ARM_CPU_IMP_NVIDIA, NVIDIA_CPU_PART_CARMEL)
 #define MIDR_FUJITSU_A64FX MIDR_CPU_MODEL(ARM_CPU_IMP_FUJITSU, FUJITSU_CPU_PART_A64FX)
diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c
index 85f4bec22f6d..58ba2d1c66a3 100644
--- a/arch/arm64/kernel/cpu_errata.c
+++ b/arch/arm64/kernel/cpu_errata.c
@@ -548,6 +548,9 @@ static const struct midr_range spectre_v2_safe_list[] = {
 	MIDR_ALL_VERSIONS(MIDR_CORTEX_A55),
 	MIDR_ALL_VERSIONS(MIDR_BRAHMA_B53),
 	MIDR_ALL_VERSIONS(MIDR_HISI_TSV110),
+	MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_3XX_SILVER),
+	MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_4XX_GOLD),
+	MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_4XX_SILVER),
 	{ /* sentinel */ }
 };
 
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Re: [PATCH] arm64: Add KRYO{3,4}XX CPU cores to spectre-v2 safe list

[Will Deacon]

[+Jeffrey]

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@codeaurora.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...

Will

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

[Jeffrey Hugo]

On 1/16/2020 8:32 AM, Will Deacon wrote:
> [+Jeffrey]
> 
> 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@codeaurora.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...

The added lines look sane to me, from a naming and MIDR perspective.  I 
don't know off hand if these CPUs are really fixed or not.

I wonder why a "KRYO_3XX_GOLD  0x802" line is not being added.  Sai?

> 
> That said, the internet claims that KRYO4XX gold is based on Cortex-A76,
> and so CSV2 should be set...
> 
> Will
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> 


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

[Sai Prakash Ranjan]

Hi Jeffrey,

On 2020-01-16 21:12, Jeffrey Hugo wrote:
> On 1/16/2020 8:32 AM, Will Deacon wrote:
>> [+Jeffrey]
>> 
>> 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@codeaurora.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...
> 
> The added lines look sane to me, from a naming and MIDR perspective.
> I don't know off hand if these CPUs are really fixed or not.
> 
> I wonder why a "KRYO_3XX_GOLD  0x802" line is not being added.  Sai?
> 

KRYO_3XX_GOLD is based on Cortex-A75 which is not spectre v2 safe.

Thanks,
Sai

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

[Sai Prakash Ranjan]

Hi Will,

On 2020-01-16 21:02, Will Deacon wrote:
> [+Jeffrey]
> 
> 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@codeaurora.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/

Thanks,
Sai

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

[Doug Anderson]

Hi,

On Thu, Jan 16, 2020 at 8:11 AM Sai Prakash Ranjan
<saiprakash.ranjan@codeaurora.org> wrote:
>
> Hi Will,
>
> On 2020-01-16 21:02, Will Deacon wrote:
> > [+Jeffrey]
> >
> > 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@codeaurora.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().

-Doug

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

[Will Deacon]

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@codeaurora.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@codeaurora.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

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

[Sai Prakash Ranjan]

Hi,

On 2020-01-16 23:57, Doug Anderson wrote:
> Hi,
> 
> On Thu, Jan 16, 2020 at 8:11 AM Sai Prakash Ranjan
> <saiprakash.ranjan@codeaurora.org> wrote:
>> 
>> Hi Will,
>> 
>> On 2020-01-16 21:02, Will Deacon wrote:
>> > [+Jeffrey]
>> >
>> > 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@codeaurora.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().
> 

I am a noob here and didn't understand what Will meant ;). V2 posted 
now.

Thanks,
Sai

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