[PATCH][for-stable-v5.11]] arm64: Unconditionally set virtual cpu id registers

[PATCH][for-stable-v5.11]] arm64: Unconditionally set virtual cpu id registers

[Vladimir Murzin]

Commit 78869f0f0552 ("arm64: Extract parts of el2_setup into a macro")
reorganized el2 setup in such way that virtual cpu id registers set
only in nVHE, yet they used (and need) to be set irrespective VHE
support. Lack of setup causes 32-bit guest stop booting due to MIDR
stay undefined.

Fixes: 78869f0f0552 ("arm64: Extract parts of el2_setup into a macro")
Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
---

There is no upstream fix since issue went away due to code there has
been reworked in 5.12: nVHE comes first, so virtual cpu id register
are always set.

Maintainers, please, Ack.

 arch/arm64/include/asm/el2_setup.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/include/asm/el2_setup.h b/arch/arm64/include/asm/el2_setup.h
index f988e94cdf9e..db87daca6b8c 100644
--- a/arch/arm64/include/asm/el2_setup.h
+++ b/arch/arm64/include/asm/el2_setup.h
@@ -113,7 +113,7 @@
 .endm
 
 /* Virtual CPU ID registers */
-.macro __init_el2_nvhe_idregs
+.macro __init_el2_idregs
 	mrs	x0, midr_el1
 	mrs	x1, mpidr_el1
 	msr	vpidr_el2, x0
@@ -165,6 +165,7 @@
 	__init_el2_stage2
 	__init_el2_gicv3
 	__init_el2_hstr
+	__init_el2_idregs
 
 	/*
 	 * When VHE is not in use, early init of EL2 needs to be done here.
@@ -173,7 +174,6 @@
 	 * will be done via the _EL1 system register aliases in __cpu_setup.
 	 */
 .ifeqs "\mode", "nvhe"
-	__init_el2_nvhe_idregs
 	__init_el2_nvhe_cptr
 	__init_el2_nvhe_sve
 	__init_el2_nvhe_prepare_eret
-- 
2.24.0

[PATCH][for-stable-v5.11]] arm64: Unconditionally set virtual cpu id registers

[Vladimir Murzin]

Commit 78869f0f0552 ("arm64: Extract parts of el2_setup into a macro")
reorganized el2 setup in such way that virtual cpu id registers set
only in nVHE, yet they used (and need) to be set irrespective VHE
support. Lack of setup causes 32-bit guest stop booting due to MIDR
stay undefined.

Fixes: 78869f0f0552 ("arm64: Extract parts of el2_setup into a macro")
Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
---

There is no upstream fix since issue went away due to code there has
been reworked in 5.12: nVHE comes first, so virtual cpu id register
are always set.

Maintainers, please, Ack.

 arch/arm64/include/asm/el2_setup.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/include/asm/el2_setup.h b/arch/arm64/include/asm/el2_setup.h
index f988e94cdf9e..db87daca6b8c 100644
--- a/arch/arm64/include/asm/el2_setup.h
+++ b/arch/arm64/include/asm/el2_setup.h
@@ -113,7 +113,7 @@
 .endm
 
 /* Virtual CPU ID registers */
-.macro __init_el2_nvhe_idregs
+.macro __init_el2_idregs
 	mrs	x0, midr_el1
 	mrs	x1, mpidr_el1
 	msr	vpidr_el2, x0
@@ -165,6 +165,7 @@
 	__init_el2_stage2
 	__init_el2_gicv3
 	__init_el2_hstr
+	__init_el2_idregs
 
 	/*
 	 * When VHE is not in use, early init of EL2 needs to be done here.
@@ -173,7 +174,6 @@
 	 * will be done via the _EL1 system register aliases in __cpu_setup.
 	 */
 .ifeqs "\mode", "nvhe"
-	__init_el2_nvhe_idregs
 	__init_el2_nvhe_cptr
 	__init_el2_nvhe_sve
 	__init_el2_nvhe_prepare_eret
-- 
2.24.0


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Re: [PATCH][for-stable-v5.11]] arm64: Unconditionally set virtual cpu id registers

[Greg KH]

On Tue, Mar 16, 2021 at 11:25:00AM +0000, Vladimir Murzin wrote:
> Commit 78869f0f0552 ("arm64: Extract parts of el2_setup into a macro")
> reorganized el2 setup in such way that virtual cpu id registers set
> only in nVHE, yet they used (and need) to be set irrespective VHE
> support. Lack of setup causes 32-bit guest stop booting due to MIDR
> stay undefined.
> 
> Fixes: 78869f0f0552 ("arm64: Extract parts of el2_setup into a macro")
> Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
> ---
> 
> There is no upstream fix since issue went away due to code there has
> been reworked in 5.12: nVHE comes first, so virtual cpu id register
> are always set.
> 
> Maintainers, please, Ack.

Why not just use the "rework" patch instead that fixes this issue?


that's always preferred instead of one-off patches.

thanks,

greg k-h

Re: [PATCH][for-stable-v5.11]] arm64: Unconditionally set virtual cpu id registers

[Greg KH]

On Tue, Mar 16, 2021 at 11:25:00AM +0000, Vladimir Murzin wrote:
> Commit 78869f0f0552 ("arm64: Extract parts of el2_setup into a macro")
> reorganized el2 setup in such way that virtual cpu id registers set
> only in nVHE, yet they used (and need) to be set irrespective VHE
> support. Lack of setup causes 32-bit guest stop booting due to MIDR
> stay undefined.
> 
> Fixes: 78869f0f0552 ("arm64: Extract parts of el2_setup into a macro")
> Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
> ---
> 
> There is no upstream fix since issue went away due to code there has
> been reworked in 5.12: nVHE comes first, so virtual cpu id register
> are always set.
> 
> Maintainers, please, Ack.

Why not just use the "rework" patch instead that fixes this issue?


that's always preferred instead of one-off patches.

thanks,

greg k-h

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Re: [PATCH][for-stable-v5.11]] arm64: Unconditionally set virtual cpu id registers

[Vladimir Murzin]

On 3/16/21 11:31 AM, Greg KH wrote:
> On Tue, Mar 16, 2021 at 11:25:00AM +0000, Vladimir Murzin wrote:
>> Commit 78869f0f0552 ("arm64: Extract parts of el2_setup into a macro")
>> reorganized el2 setup in such way that virtual cpu id registers set
>> only in nVHE, yet they used (and need) to be set irrespective VHE
>> support. Lack of setup causes 32-bit guest stop booting due to MIDR
>> stay undefined.
>>
>> Fixes: 78869f0f0552 ("arm64: Extract parts of el2_setup into a macro")
>> Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
>> ---
>>
>> There is no upstream fix since issue went away due to code there has
>> been reworked in 5.12: nVHE comes first, so virtual cpu id register
>> are always set.
>>
>> Maintainers, please, Ack.
> 
> Why not just use the "rework" patch instead that fixes this issue?> 
> 
> that's always preferred instead of one-off patches.

That's moderate size patch series [1] which brings new functionality, but
more importantly move boot flow upside down, where we first boot nVHE and
then switch to VHE if supported. I think that a lot of change to carry in
stable compare to proposed fix.

[1] https://lore.kernel.org/kvmarm/20210208095732.3267263-2-maz@kernel.org/

Cheers
Vladimir

> 
> thanks,
> 
> greg k-h
> 

Re: [PATCH][for-stable-v5.11]] arm64: Unconditionally set virtual cpu id registers

[Vladimir Murzin]

On 3/16/21 11:31 AM, Greg KH wrote:
> On Tue, Mar 16, 2021 at 11:25:00AM +0000, Vladimir Murzin wrote:
>> Commit 78869f0f0552 ("arm64: Extract parts of el2_setup into a macro")
>> reorganized el2 setup in such way that virtual cpu id registers set
>> only in nVHE, yet they used (and need) to be set irrespective VHE
>> support. Lack of setup causes 32-bit guest stop booting due to MIDR
>> stay undefined.
>>
>> Fixes: 78869f0f0552 ("arm64: Extract parts of el2_setup into a macro")
>> Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
>> ---
>>
>> There is no upstream fix since issue went away due to code there has
>> been reworked in 5.12: nVHE comes first, so virtual cpu id register
>> are always set.
>>
>> Maintainers, please, Ack.
> 
> Why not just use the "rework" patch instead that fixes this issue?> 
> 
> that's always preferred instead of one-off patches.

That's moderate size patch series [1] which brings new functionality, but
more importantly move boot flow upside down, where we first boot nVHE and
then switch to VHE if supported. I think that a lot of change to carry in
stable compare to proposed fix.

[1] https://lore.kernel.org/kvmarm/20210208095732.3267263-2-maz@kernel.org/

Cheers
Vladimir

> 
> thanks,
> 
> greg k-h
> 


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Re: [PATCH][for-stable-v5.11]] arm64: Unconditionally set virtual cpu id registers

[Marc Zyngier]

On 2021-03-16 11:31, Greg KH wrote:
> On Tue, Mar 16, 2021 at 11:25:00AM +0000, Vladimir Murzin wrote:
>> Commit 78869f0f0552 ("arm64: Extract parts of el2_setup into a macro")
>> reorganized el2 setup in such way that virtual cpu id registers set
>> only in nVHE, yet they used (and need) to be set irrespective VHE
>> support. Lack of setup causes 32-bit guest stop booting due to MIDR
>> stay undefined.
>> 
>> Fixes: 78869f0f0552 ("arm64: Extract parts of el2_setup into a macro")
>> Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
>> ---
>> 
>> There is no upstream fix since issue went away due to code there has
>> been reworked in 5.12: nVHE comes first, so virtual cpu id register
>> are always set.
>> 
>> Maintainers, please, Ack.
> 
> Why not just use the "rework" patch instead that fixes this issue?
> 
> 
> that's always preferred instead of one-off patches.

It isn't just a "rework" patch. It's a whole series that turns the
world upside down, and it really isn't suitable for backporting in
the upstream kernel.

My preference would be to fix 5.11. I'll review that patch in a moment.

Thanks,

         M.
-- 
Jazz is not dead. It just smells funny...

Re: [PATCH][for-stable-v5.11]] arm64: Unconditionally set virtual cpu id registers

[Marc Zyngier]

On 2021-03-16 11:31, Greg KH wrote:
> On Tue, Mar 16, 2021 at 11:25:00AM +0000, Vladimir Murzin wrote:
>> Commit 78869f0f0552 ("arm64: Extract parts of el2_setup into a macro")
>> reorganized el2 setup in such way that virtual cpu id registers set
>> only in nVHE, yet they used (and need) to be set irrespective VHE
>> support. Lack of setup causes 32-bit guest stop booting due to MIDR
>> stay undefined.
>> 
>> Fixes: 78869f0f0552 ("arm64: Extract parts of el2_setup into a macro")
>> Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
>> ---
>> 
>> There is no upstream fix since issue went away due to code there has
>> been reworked in 5.12: nVHE comes first, so virtual cpu id register
>> are always set.
>> 
>> Maintainers, please, Ack.
> 
> Why not just use the "rework" patch instead that fixes this issue?
> 
> 
> that's always preferred instead of one-off patches.

It isn't just a "rework" patch. It's a whole series that turns the
world upside down, and it really isn't suitable for backporting in
the upstream kernel.

My preference would be to fix 5.11. I'll review that patch in a moment.

Thanks,

         M.
-- 
Jazz is not dead. It just smells funny...

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Re: [PATCH][for-stable-v5.11]] arm64: Unconditionally set virtual cpu id registers

[Marc Zyngier]

Hi Vladimir,

On Tue, 16 Mar 2021 11:25:00 +0000,
Vladimir Murzin <vladimir.murzin@arm.com> wrote:
> 
> Commit 78869f0f0552 ("arm64: Extract parts of el2_setup into a macro")
> reorganized el2 setup in such way that virtual cpu id registers set
> only in nVHE, yet they used (and need) to be set irrespective VHE
> support. Lack of setup causes 32-bit guest stop booting due to MIDR
> stay undefined.

Surely this affects 64bit guests as well, doesn't it? I guess the
32bit code tries to infer stuff such as the architecture revision from
MIDR and falls over, and that the 64bit Linux code has less baggage?

>
> Fixes: 78869f0f0552 ("arm64: Extract parts of el2_setup into a macro")
> Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
> ---
> 
> There is no upstream fix since issue went away due to code there has
> been reworked in 5.12: nVHE comes first, so virtual cpu id register
> are always set.
> 
> Maintainers, please, Ack.
> 
>  arch/arm64/include/asm/el2_setup.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/include/asm/el2_setup.h b/arch/arm64/include/asm/el2_setup.h
> index f988e94cdf9e..db87daca6b8c 100644
> --- a/arch/arm64/include/asm/el2_setup.h
> +++ b/arch/arm64/include/asm/el2_setup.h
> @@ -113,7 +113,7 @@
>  .endm
>  
>  /* Virtual CPU ID registers */
> -.macro __init_el2_nvhe_idregs
> +.macro __init_el2_idregs
>  	mrs	x0, midr_el1
>  	mrs	x1, mpidr_el1
>  	msr	vpidr_el2, x0
> @@ -165,6 +165,7 @@
>  	__init_el2_stage2
>  	__init_el2_gicv3
>  	__init_el2_hstr
> +	__init_el2_idregs
>  
>  	/*
>  	 * When VHE is not in use, early init of EL2 needs to be done here.
> @@ -173,7 +174,6 @@
>  	 * will be done via the _EL1 system register aliases in __cpu_setup.
>  	 */
>  .ifeqs "\mode", "nvhe"
> -	__init_el2_nvhe_idregs
>  	__init_el2_nvhe_cptr
>  	__init_el2_nvhe_sve
>  	__init_el2_nvhe_prepare_eret

The couple of VHE systems I have around don't suffer from this issue,
but it looks like I can trigger it on the FVP model (probably because
the model is nasty enough to not have VPIDR_EL2 default to anything
sensible!).

Anyway, good catch. If you can respin it to drop the reference to
32bit guests, I'll happily ack it!

Thanks,

	M.

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

Re: [PATCH][for-stable-v5.11]] arm64: Unconditionally set virtual cpu id registers

[Marc Zyngier]

Hi Vladimir,

On Tue, 16 Mar 2021 11:25:00 +0000,
Vladimir Murzin <vladimir.murzin@arm.com> wrote:
> 
> Commit 78869f0f0552 ("arm64: Extract parts of el2_setup into a macro")
> reorganized el2 setup in such way that virtual cpu id registers set
> only in nVHE, yet they used (and need) to be set irrespective VHE
> support. Lack of setup causes 32-bit guest stop booting due to MIDR
> stay undefined.

Surely this affects 64bit guests as well, doesn't it? I guess the
32bit code tries to infer stuff such as the architecture revision from
MIDR and falls over, and that the 64bit Linux code has less baggage?

>
> Fixes: 78869f0f0552 ("arm64: Extract parts of el2_setup into a macro")
> Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
> ---
> 
> There is no upstream fix since issue went away due to code there has
> been reworked in 5.12: nVHE comes first, so virtual cpu id register
> are always set.
> 
> Maintainers, please, Ack.
> 
>  arch/arm64/include/asm/el2_setup.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/include/asm/el2_setup.h b/arch/arm64/include/asm/el2_setup.h
> index f988e94cdf9e..db87daca6b8c 100644
> --- a/arch/arm64/include/asm/el2_setup.h
> +++ b/arch/arm64/include/asm/el2_setup.h
> @@ -113,7 +113,7 @@
>  .endm
>  
>  /* Virtual CPU ID registers */
> -.macro __init_el2_nvhe_idregs
> +.macro __init_el2_idregs
>  	mrs	x0, midr_el1
>  	mrs	x1, mpidr_el1
>  	msr	vpidr_el2, x0
> @@ -165,6 +165,7 @@
>  	__init_el2_stage2
>  	__init_el2_gicv3
>  	__init_el2_hstr
> +	__init_el2_idregs
>  
>  	/*
>  	 * When VHE is not in use, early init of EL2 needs to be done here.
> @@ -173,7 +174,6 @@
>  	 * will be done via the _EL1 system register aliases in __cpu_setup.
>  	 */
>  .ifeqs "\mode", "nvhe"
> -	__init_el2_nvhe_idregs
>  	__init_el2_nvhe_cptr
>  	__init_el2_nvhe_sve
>  	__init_el2_nvhe_prepare_eret

The couple of VHE systems I have around don't suffer from this issue,
but it looks like I can trigger it on the FVP model (probably because
the model is nasty enough to not have VPIDR_EL2 default to anything
sensible!).

Anyway, good catch. If you can respin it to drop the reference to
32bit guests, I'll happily ack it!

Thanks,

	M.

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

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Re: [PATCH][for-stable-v5.11]] arm64: Unconditionally set virtual cpu id registers

[Vladimir Murzin]

Hi Marc,

On 3/16/21 1:22 PM, Marc Zyngier wrote:
> Hi Vladimir,
> 
> On Tue, 16 Mar 2021 11:25:00 +0000,
> Vladimir Murzin <vladimir.murzin@arm.com> wrote:
>>
>> Commit 78869f0f0552 ("arm64: Extract parts of el2_setup into a macro")
>> reorganized el2 setup in such way that virtual cpu id registers set
>> only in nVHE, yet they used (and need) to be set irrespective VHE
>> support. Lack of setup causes 32-bit guest stop booting due to MIDR
>> stay undefined.
> 
> Surely this affects 64bit guests as well, doesn't it? I guess the
> 32bit code tries to infer stuff such as the architecture revision from
> MIDR and falls over, and that the 64bit Linux code has less baggage?

Correct, that affects all guests, yet 32-bit tries to lookup processor type
so it is how it became visible to me

> 
>>
>> Fixes: 78869f0f0552 ("arm64: Extract parts of el2_setup into a macro")
>> Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
>> ---
>>
>> There is no upstream fix since issue went away due to code there has
>> been reworked in 5.12: nVHE comes first, so virtual cpu id register
>> are always set.
>>
>> Maintainers, please, Ack.
>>
>>  arch/arm64/include/asm/el2_setup.h | 4 ++--
>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/arch/arm64/include/asm/el2_setup.h b/arch/arm64/include/asm/el2_setup.h
>> index f988e94cdf9e..db87daca6b8c 100644
>> --- a/arch/arm64/include/asm/el2_setup.h
>> +++ b/arch/arm64/include/asm/el2_setup.h
>> @@ -113,7 +113,7 @@
>>  .endm
>>  
>>  /* Virtual CPU ID registers */
>> -.macro __init_el2_nvhe_idregs
>> +.macro __init_el2_idregs
>>  	mrs	x0, midr_el1
>>  	mrs	x1, mpidr_el1
>>  	msr	vpidr_el2, x0
>> @@ -165,6 +165,7 @@
>>  	__init_el2_stage2
>>  	__init_el2_gicv3
>>  	__init_el2_hstr
>> +	__init_el2_idregs
>>  
>>  	/*
>>  	 * When VHE is not in use, early init of EL2 needs to be done here.
>> @@ -173,7 +174,6 @@
>>  	 * will be done via the _EL1 system register aliases in __cpu_setup.
>>  	 */
>>  .ifeqs "\mode", "nvhe"
>> -	__init_el2_nvhe_idregs
>>  	__init_el2_nvhe_cptr
>>  	__init_el2_nvhe_sve
>>  	__init_el2_nvhe_prepare_eret
> 
> The couple of VHE systems I have around don't suffer from this issue,
> but it looks like I can trigger it on the FVP model (probably because
> the model is nasty enough to not have VPIDR_EL2 default to anything
> sensible!).

Well firmware could easily hide the issue if it set registers for us ;)

> 
> Anyway, good catch. If you can respin it to drop the reference to
> 32bit guests, I'll happily ack it!

Thanks for prompt review! I'll re-spin it shortly.

Vladimir

> 
> Thanks,
> 
> 	M.
> 

Re: [PATCH][for-stable-v5.11]] arm64: Unconditionally set virtual cpu id registers

[Vladimir Murzin]

Hi Marc,

On 3/16/21 1:22 PM, Marc Zyngier wrote:
> Hi Vladimir,
> 
> On Tue, 16 Mar 2021 11:25:00 +0000,
> Vladimir Murzin <vladimir.murzin@arm.com> wrote:
>>
>> Commit 78869f0f0552 ("arm64: Extract parts of el2_setup into a macro")
>> reorganized el2 setup in such way that virtual cpu id registers set
>> only in nVHE, yet they used (and need) to be set irrespective VHE
>> support. Lack of setup causes 32-bit guest stop booting due to MIDR
>> stay undefined.
> 
> Surely this affects 64bit guests as well, doesn't it? I guess the
> 32bit code tries to infer stuff such as the architecture revision from
> MIDR and falls over, and that the 64bit Linux code has less baggage?

Correct, that affects all guests, yet 32-bit tries to lookup processor type
so it is how it became visible to me

> 
>>
>> Fixes: 78869f0f0552 ("arm64: Extract parts of el2_setup into a macro")
>> Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
>> ---
>>
>> There is no upstream fix since issue went away due to code there has
>> been reworked in 5.12: nVHE comes first, so virtual cpu id register
>> are always set.
>>
>> Maintainers, please, Ack.
>>
>>  arch/arm64/include/asm/el2_setup.h | 4 ++--
>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/arch/arm64/include/asm/el2_setup.h b/arch/arm64/include/asm/el2_setup.h
>> index f988e94cdf9e..db87daca6b8c 100644
>> --- a/arch/arm64/include/asm/el2_setup.h
>> +++ b/arch/arm64/include/asm/el2_setup.h
>> @@ -113,7 +113,7 @@
>>  .endm
>>  
>>  /* Virtual CPU ID registers */
>> -.macro __init_el2_nvhe_idregs
>> +.macro __init_el2_idregs
>>  	mrs	x0, midr_el1
>>  	mrs	x1, mpidr_el1
>>  	msr	vpidr_el2, x0
>> @@ -165,6 +165,7 @@
>>  	__init_el2_stage2
>>  	__init_el2_gicv3
>>  	__init_el2_hstr
>> +	__init_el2_idregs
>>  
>>  	/*
>>  	 * When VHE is not in use, early init of EL2 needs to be done here.
>> @@ -173,7 +174,6 @@
>>  	 * will be done via the _EL1 system register aliases in __cpu_setup.
>>  	 */
>>  .ifeqs "\mode", "nvhe"
>> -	__init_el2_nvhe_idregs
>>  	__init_el2_nvhe_cptr
>>  	__init_el2_nvhe_sve
>>  	__init_el2_nvhe_prepare_eret
> 
> The couple of VHE systems I have around don't suffer from this issue,
> but it looks like I can trigger it on the FVP model (probably because
> the model is nasty enough to not have VPIDR_EL2 default to anything
> sensible!).

Well firmware could easily hide the issue if it set registers for us ;)

> 
> Anyway, good catch. If you can respin it to drop the reference to
> 32bit guests, I'll happily ack it!

Thanks for prompt review! I'll re-spin it shortly.

Vladimir

> 
> Thanks,
> 
> 	M.
> 


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel