From: Vladimir Murzin <hidden> Date: 2021-03-16 11:26:46
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 <redacted>
---
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(-)
@@ -113,7 +113,7 @@.endm/* Virtual CPU ID registers */-.macro__init_el2_nvhe_idregs+.macro__init_el2_idregsmrsx0,midr_el1mrsx1,mpidr_el1msrvpidr_el2,x0
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 <redacted>
---
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
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From: Vladimir Murzin <hidden> Date: 2021-03-16 11:41:50
On 3/16/21 11:31 AM, Greg KH wrote:
On Tue, Mar 16, 2021 at 11:25:00AM +0000, Vladimir Murzin wrote:
quoted
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 <redacted>
---
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
From: Marc Zyngier <maz@kernel.org> Date: 2021-03-16 11:42:22
On 2021-03-16 11:31, Greg KH wrote:
On Tue, Mar 16, 2021 at 11:25:00AM +0000, Vladimir Murzin wrote:
quoted
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 <redacted>
---
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.
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From: Marc Zyngier <maz@kernel.org> Date: 2021-03-16 13:23:16
Hi Vladimir,
On Tue, 16 Mar 2021 11:25:00 +0000,
Vladimir Murzin [off-list ref] 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?
quoted hunk
Fixes: 78869f0f0552 ("arm64: Extract parts of el2_setup into a macro")
Signed-off-by: Vladimir Murzin <redacted>
---
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(-)
@@ -113,7 +113,7 @@.endm/* Virtual CPU ID registers */-.macro__init_el2_nvhe_idregs+.macro__init_el2_idregsmrsx0,midr_el1mrsx1,mpidr_el1msrvpidr_el2,x0
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.
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From: Vladimir Murzin <hidden> Date: 2021-03-16 13:38:12
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 [off-list ref] wrote:
quoted
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
quoted
Fixes: 78869f0f0552 ("arm64: Extract parts of el2_setup into a macro")
Signed-off-by: Vladimir Murzin <redacted>
---
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(-)
@@ -113,7 +113,7 @@.endm/* Virtual CPU ID registers */-.macro__init_el2_nvhe_idregs+.macro__init_el2_idregsmrsx0,midr_el1mrsx1,mpidr_el1msrvpidr_el2,x0
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