* [PATCH 1/2] arm64: KVM: regmap: Mark expected switch fall-through
@ 2019-07-26 11:27 Anders Roxell
2019-07-26 12:30 ` Marc Zyngier
2019-07-26 14:17 ` Sasha Levin
0 siblings, 2 replies; 4+ messages in thread
From: Anders Roxell @ 2019-07-26 11:27 UTC (permalink / raw)
To: maz, catalin.marinas, will
Cc: stable, Anders Roxell, kvmarm, linux-arm-kernel, linux-kernel
When fall-through warnings was enabled by default, commit d93512ef0f0e
("Makefile: Globally enable fall-through warning"), the following
warnings was starting to show up:
In file included from ../arch/arm64/include/asm/kvm_emulate.h:19,
from ../arch/arm64/kvm/regmap.c:13:
../arch/arm64/kvm/regmap.c: In function ‘vcpu_write_spsr32’:
../arch/arm64/include/asm/kvm_hyp.h:31:3: warning: this statement may fall
through [-Wimplicit-fallthrough=]
asm volatile(ALTERNATIVE(__msr_s(r##nvh, "%x0"), \
^~~
../arch/arm64/include/asm/kvm_hyp.h:46:31: note: in expansion of macro ‘write_sysreg_elx’
#define write_sysreg_el1(v,r) write_sysreg_elx(v, r, _EL1, _EL12)
^~~~~~~~~~~~~~~~
../arch/arm64/kvm/regmap.c:180:3: note: in expansion of macro ‘write_sysreg_el1’
write_sysreg_el1(v, SYS_SPSR);
^~~~~~~~~~~~~~~~
../arch/arm64/kvm/regmap.c:181:2: note: here
case KVM_SPSR_ABT:
^~~~
In file included from ../arch/arm64/include/asm/cputype.h:132,
from ../arch/arm64/include/asm/cache.h:8,
from ../include/linux/cache.h:6,
from ../include/linux/printk.h:9,
from ../include/linux/kernel.h:15,
from ../include/asm-generic/bug.h:18,
from ../arch/arm64/include/asm/bug.h:26,
from ../include/linux/bug.h:5,
from ../include/linux/mmdebug.h:5,
from ../include/linux/mm.h:9,
from ../arch/arm64/kvm/regmap.c:11:
../arch/arm64/include/asm/sysreg.h:837:2: warning: this statement may fall
through [-Wimplicit-fallthrough=]
asm volatile("msr " __stringify(r) ", %x0" \
^~~
../arch/arm64/kvm/regmap.c:182:3: note: in expansion of macro ‘write_sysreg’
write_sysreg(v, spsr_abt);
^~~~~~~~~~~~
../arch/arm64/kvm/regmap.c:183:2: note: here
case KVM_SPSR_UND:
^~~~
Rework to add a 'break;' in the swich-case since it didn't have that.
That also made the compiler happy and didn't warn about fall-through.
Cc: stable@vger.kernel.org # v3.16+
Fixes: a892819560c4 ("KVM: arm64: Prepare to handle deferred save/restore of 32-bit registers")
Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
---
arch/arm64/kvm/regmap.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/arch/arm64/kvm/regmap.c b/arch/arm64/kvm/regmap.c
index 0d60e4f0af66..a900181e3867 100644
--- a/arch/arm64/kvm/regmap.c
+++ b/arch/arm64/kvm/regmap.c
@@ -178,13 +178,18 @@ void vcpu_write_spsr32(struct kvm_vcpu *vcpu, unsigned long v)
switch (spsr_idx) {
case KVM_SPSR_SVC:
write_sysreg_el1(v, SYS_SPSR);
+ break;
case KVM_SPSR_ABT:
write_sysreg(v, spsr_abt);
+ break;
case KVM_SPSR_UND:
write_sysreg(v, spsr_und);
+ break;
case KVM_SPSR_IRQ:
write_sysreg(v, spsr_irq);
+ break;
case KVM_SPSR_FIQ:
write_sysreg(v, spsr_fiq);
+ break;
}
}
--
2.20.1
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^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH 1/2] arm64: KVM: regmap: Mark expected switch fall-through
2019-07-26 11:27 [PATCH 1/2] arm64: KVM: regmap: Mark expected switch fall-through Anders Roxell
@ 2019-07-26 12:30 ` Marc Zyngier
2019-07-26 14:05 ` Anders Roxell
2019-07-26 14:17 ` Sasha Levin
1 sibling, 1 reply; 4+ messages in thread
From: Marc Zyngier @ 2019-07-26 12:30 UTC (permalink / raw)
To: Anders Roxell
Cc: catalin.marinas, linux-kernel, stable, will, kvmarm, linux-arm-kernel
Hi Anders,
On Fri, 26 Jul 2019 12:27:05 +0100,
Anders Roxell <anders.roxell@linaro.org> wrote:
>
> When fall-through warnings was enabled by default, commit d93512ef0f0e
> ("Makefile: Globally enable fall-through warning"), the following
> warnings was starting to show up:
>
> In file included from ../arch/arm64/include/asm/kvm_emulate.h:19,
> from ../arch/arm64/kvm/regmap.c:13:
> ../arch/arm64/kvm/regmap.c: In function ‘vcpu_write_spsr32’:
> ../arch/arm64/include/asm/kvm_hyp.h:31:3: warning: this statement may fall
> through [-Wimplicit-fallthrough=]
> asm volatile(ALTERNATIVE(__msr_s(r##nvh, "%x0"), \
> ^~~
> ../arch/arm64/include/asm/kvm_hyp.h:46:31: note: in expansion of macro ‘write_sysreg_elx’
> #define write_sysreg_el1(v,r) write_sysreg_elx(v, r, _EL1, _EL12)
> ^~~~~~~~~~~~~~~~
> ../arch/arm64/kvm/regmap.c:180:3: note: in expansion of macro ‘write_sysreg_el1’
> write_sysreg_el1(v, SYS_SPSR);
> ^~~~~~~~~~~~~~~~
> ../arch/arm64/kvm/regmap.c:181:2: note: here
> case KVM_SPSR_ABT:
> ^~~~
> In file included from ../arch/arm64/include/asm/cputype.h:132,
> from ../arch/arm64/include/asm/cache.h:8,
> from ../include/linux/cache.h:6,
> from ../include/linux/printk.h:9,
> from ../include/linux/kernel.h:15,
> from ../include/asm-generic/bug.h:18,
> from ../arch/arm64/include/asm/bug.h:26,
> from ../include/linux/bug.h:5,
> from ../include/linux/mmdebug.h:5,
> from ../include/linux/mm.h:9,
> from ../arch/arm64/kvm/regmap.c:11:
> ../arch/arm64/include/asm/sysreg.h:837:2: warning: this statement may fall
> through [-Wimplicit-fallthrough=]
> asm volatile("msr " __stringify(r) ", %x0" \
> ^~~
> ../arch/arm64/kvm/regmap.c:182:3: note: in expansion of macro ‘write_sysreg’
> write_sysreg(v, spsr_abt);
> ^~~~~~~~~~~~
> ../arch/arm64/kvm/regmap.c:183:2: note: here
> case KVM_SPSR_UND:
> ^~~~
>
> Rework to add a 'break;' in the swich-case since it didn't have that.
> That also made the compiler happy and didn't warn about fall-through.
>
> Cc: stable@vger.kernel.org # v3.16+
Erm... Are you sure about that? Here's what I have:
$ git describe --contains a892819560c4
kvm-arm-for-v4.17~44
$ git describe --contains --match='v*' a892819560c4
v4.17-rc1~72^2~36^2~44
> Fixes: a892819560c4 ("KVM: arm64: Prepare to handle deferred save/restore of 32-bit registers")
> Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
> ---
> arch/arm64/kvm/regmap.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/arch/arm64/kvm/regmap.c b/arch/arm64/kvm/regmap.c
> index 0d60e4f0af66..a900181e3867 100644
> --- a/arch/arm64/kvm/regmap.c
> +++ b/arch/arm64/kvm/regmap.c
> @@ -178,13 +178,18 @@ void vcpu_write_spsr32(struct kvm_vcpu *vcpu, unsigned long v)
> switch (spsr_idx) {
> case KVM_SPSR_SVC:
> write_sysreg_el1(v, SYS_SPSR);
> + break;
> case KVM_SPSR_ABT:
> write_sysreg(v, spsr_abt);
> + break;
> case KVM_SPSR_UND:
> write_sysreg(v, spsr_und);
> + break;
> case KVM_SPSR_IRQ:
> write_sysreg(v, spsr_irq);
> + break;
> case KVM_SPSR_FIQ:
> write_sysreg(v, spsr_fiq);
> + break;
> }
> }
Otherwise looks like the right fix to me. Let me know what you think
about the Fixes: tag (no need to resend for that).
Thanks,
M.
--
Jazz is not dead, it just smells funny.
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH 1/2] arm64: KVM: regmap: Mark expected switch fall-through
2019-07-26 12:30 ` Marc Zyngier
@ 2019-07-26 14:05 ` Anders Roxell
0 siblings, 0 replies; 4+ messages in thread
From: Anders Roxell @ 2019-07-26 14:05 UTC (permalink / raw)
To: Marc Zyngier
Cc: Catalin Marinas, Linux Kernel Mailing List, stable, will, kvmarm,
Linux ARM
On Fri, 26 Jul 2019 at 14:30, Marc Zyngier <marc.zyngier@arm.com> wrote:
>
> Hi Anders,
>
> On Fri, 26 Jul 2019 12:27:05 +0100,
> Anders Roxell <anders.roxell@linaro.org> wrote:
> >
> > When fall-through warnings was enabled by default, commit d93512ef0f0e
> > ("Makefile: Globally enable fall-through warning"), the following
> > warnings was starting to show up:
> >
> > In file included from ../arch/arm64/include/asm/kvm_emulate.h:19,
> > from ../arch/arm64/kvm/regmap.c:13:
> > ../arch/arm64/kvm/regmap.c: In function ‘vcpu_write_spsr32’:
> > ../arch/arm64/include/asm/kvm_hyp.h:31:3: warning: this statement may fall
> > through [-Wimplicit-fallthrough=]
> > asm volatile(ALTERNATIVE(__msr_s(r##nvh, "%x0"), \
> > ^~~
> > ../arch/arm64/include/asm/kvm_hyp.h:46:31: note: in expansion of macro ‘write_sysreg_elx’
> > #define write_sysreg_el1(v,r) write_sysreg_elx(v, r, _EL1, _EL12)
> > ^~~~~~~~~~~~~~~~
> > ../arch/arm64/kvm/regmap.c:180:3: note: in expansion of macro ‘write_sysreg_el1’
> > write_sysreg_el1(v, SYS_SPSR);
> > ^~~~~~~~~~~~~~~~
> > ../arch/arm64/kvm/regmap.c:181:2: note: here
> > case KVM_SPSR_ABT:
> > ^~~~
> > In file included from ../arch/arm64/include/asm/cputype.h:132,
> > from ../arch/arm64/include/asm/cache.h:8,
> > from ../include/linux/cache.h:6,
> > from ../include/linux/printk.h:9,
> > from ../include/linux/kernel.h:15,
> > from ../include/asm-generic/bug.h:18,
> > from ../arch/arm64/include/asm/bug.h:26,
> > from ../include/linux/bug.h:5,
> > from ../include/linux/mmdebug.h:5,
> > from ../include/linux/mm.h:9,
> > from ../arch/arm64/kvm/regmap.c:11:
> > ../arch/arm64/include/asm/sysreg.h:837:2: warning: this statement may fall
> > through [-Wimplicit-fallthrough=]
> > asm volatile("msr " __stringify(r) ", %x0" \
> > ^~~
> > ../arch/arm64/kvm/regmap.c:182:3: note: in expansion of macro ‘write_sysreg’
> > write_sysreg(v, spsr_abt);
> > ^~~~~~~~~~~~
> > ../arch/arm64/kvm/regmap.c:183:2: note: here
> > case KVM_SPSR_UND:
> > ^~~~
> >
> > Rework to add a 'break;' in the swich-case since it didn't have that.
> > That also made the compiler happy and didn't warn about fall-through.
> >
> > Cc: stable@vger.kernel.org # v3.16+
>
> Erm... Are you sure about that?
I made two mistakes.
1. saying 3.x instead of 4.x
2. I said the same kernel that 'git describe' showed and not the later one.
I did not know about '--match='.
> Here's what I have:
>
> $ git describe --contains a892819560c4
> kvm-arm-for-v4.17~44
> $ git describe --contains --match='v*' a892819560c4
> v4.17-rc1~72^2~36^2~44
That's correct.
>
>
> > Fixes: a892819560c4 ("KVM: arm64: Prepare to handle deferred save/restore of 32-bit registers")
> > Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
> > ---
> > arch/arm64/kvm/regmap.c | 5 +++++
> > 1 file changed, 5 insertions(+)
> >
> > diff --git a/arch/arm64/kvm/regmap.c b/arch/arm64/kvm/regmap.c
> > index 0d60e4f0af66..a900181e3867 100644
> > --- a/arch/arm64/kvm/regmap.c
> > +++ b/arch/arm64/kvm/regmap.c
> > @@ -178,13 +178,18 @@ void vcpu_write_spsr32(struct kvm_vcpu *vcpu, unsigned long v)
> > switch (spsr_idx) {
> > case KVM_SPSR_SVC:
> > write_sysreg_el1(v, SYS_SPSR);
> > + break;
> > case KVM_SPSR_ABT:
> > write_sysreg(v, spsr_abt);
> > + break;
> > case KVM_SPSR_UND:
> > write_sysreg(v, spsr_und);
> > + break;
> > case KVM_SPSR_IRQ:
> > write_sysreg(v, spsr_irq);
> > + break;
> > case KVM_SPSR_FIQ:
> > write_sysreg(v, spsr_fiq);
> > + break;
> > }
> > }
>
> Otherwise looks like the right fix to me. Let me know what you think
> about the Fixes: tag (no need to resend for that).
It should be v4.17+.
Cheers,
Anders
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH 1/2] arm64: KVM: regmap: Mark expected switch fall-through
2019-07-26 11:27 [PATCH 1/2] arm64: KVM: regmap: Mark expected switch fall-through Anders Roxell
2019-07-26 12:30 ` Marc Zyngier
@ 2019-07-26 14:17 ` Sasha Levin
1 sibling, 0 replies; 4+ messages in thread
From: Sasha Levin @ 2019-07-26 14:17 UTC (permalink / raw)
To: Sasha Levin, Anders Roxell, maz, catalin.marinas, will
Cc: , stable, kvmarm, linux-arm-kernel
Hi,
[This is an automated email]
This commit has been processed because it contains a "Fixes:" tag,
fixing commit: a892819560c4 KVM: arm64: Prepare to handle deferred save/restore of 32-bit registers.
The bot has tested the following trees: v5.2.2, v5.1.19, v4.19.60.
v5.2.2: Failed to apply! Possible dependencies:
fdec2a9ef853 ("KVM: arm64: Migrate _elx sysreg accessors to msr_s/mrs_s")
v5.1.19: Failed to apply! Possible dependencies:
73433762fcae ("KVM: arm64/sve: System register context switch and access support")
be604c616ca7 ("arm64: sysreg: Make mrs_s and msr_s macros work with Clang and LTO")
fdec2a9ef853 ("KVM: arm64: Migrate _elx sysreg accessors to msr_s/mrs_s")
v4.19.60: Failed to apply! Possible dependencies:
84135d3d18da ("KVM: arm/arm64: consolidate arch timer trap handlers")
8a411b060f82 ("KVM: arm/arm64: Remove arch timer workqueue")
9e01dc76be6a ("KVM: arm/arm64: arch_timer: Assign the phys timer on VHE systems")
accb99bcd0ca ("KVM: arm/arm64: Simplify bg_timer programming")
bd7d95cafb49 ("arm64: KVM: Consistently advance singlestep when emulating instructions")
e604dd5d45c7 ("KVM: arm/arm64: timer: Rework data structures for multiple timers")
fdec2a9ef853 ("KVM: arm64: Migrate _elx sysreg accessors to msr_s/mrs_s")
NOTE: The patch will not be queued to stable trees until it is upstream.
How should we proceed with this patch?
--
Thanks,
Sasha
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2019-07-26 11:27 [PATCH 1/2] arm64: KVM: regmap: Mark expected switch fall-through Anders Roxell
2019-07-26 12:30 ` Marc Zyngier
2019-07-26 14:05 ` Anders Roxell
2019-07-26 14:17 ` Sasha Levin
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