* [PATCH] accel/tcg: Add stub for probe_access()
@ 2020-04-23 7:10 Philippe Mathieu-Daudé
2020-04-23 7:49 ` David Hildenbrand
0 siblings, 1 reply; 5+ messages in thread
From: Philippe Mathieu-Daudé @ 2020-04-23 7:10 UTC (permalink / raw)
To: qemu-devel
Cc: David Hildenbrand, Philippe Mathieu-Daudé,
Emilio G . Cota, Paolo Bonzini, Alex Bennée,
Richard Henderson
The TCG helpers where added in b92e5a22ec3 in softmmu_template.h.
probe_write() was added in there in 3b4afc9e75a to be moved out
to accel/tcg/cputlb.c in 3b08f0a9254, and was later refactored
as probe_access() in c25c283df0f.
Since it is a TCG specific helper, add a stub to avoid failures
when building without TCG, such:
target/arm/helper.o: In function `probe_read':
include/exec/exec-all.h:345: undefined reference to `probe_access'
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
Cc: Richard Henderson <rth@twiddle.net>
Cc: Emilio G. Cota <cota@braap.org>
Cc: Alex Bennée <alex.bennee@linaro.org>
Cc: David Hildenbrand <david@redhat.com>
---
accel/stubs/tcg-stub.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/accel/stubs/tcg-stub.c b/accel/stubs/tcg-stub.c
index 677191a69c..e4bbf997aa 100644
--- a/accel/stubs/tcg-stub.c
+++ b/accel/stubs/tcg-stub.c
@@ -22,3 +22,10 @@ void tb_flush(CPUState *cpu)
void tlb_set_dirty(CPUState *cpu, target_ulong vaddr)
{
}
+
+void *probe_access(CPUArchState *env, target_ulong addr, int size,
+ MMUAccessType access_type, int mmu_idx, uintptr_t retaddr)
+{
+ /* Handled by hardware accelerator. */
+ g_assert_not_reached();
+}
--
2.21.1
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH] accel/tcg: Add stub for probe_access()
2020-04-23 7:10 [PATCH] accel/tcg: Add stub for probe_access() Philippe Mathieu-Daudé
@ 2020-04-23 7:49 ` David Hildenbrand
2020-04-23 7:59 ` Philippe Mathieu-Daudé
0 siblings, 1 reply; 5+ messages in thread
From: David Hildenbrand @ 2020-04-23 7:49 UTC (permalink / raw)
To: Philippe Mathieu-Daudé, qemu-devel
Cc: Paolo Bonzini, Emilio G . Cota, Alex Bennée,
Beata Michalska, Richard Henderson
On 23.04.20 09:10, Philippe Mathieu-Daudé wrote:
> The TCG helpers where added in b92e5a22ec3 in softmmu_template.h.
> probe_write() was added in there in 3b4afc9e75a to be moved out
> to accel/tcg/cputlb.c in 3b08f0a9254, and was later refactored
> as probe_access() in c25c283df0f.
> Since it is a TCG specific helper, add a stub to avoid failures
> when building without TCG, such:
>
> target/arm/helper.o: In function `probe_read':
> include/exec/exec-all.h:345: undefined reference to `probe_access'
I think you're missing the most important commit:
0d57b4999220 ("target/arm: Add support for DC CVAP & DC CVADP ins")
I do wonder if dccvap_writefn() and calling code should be compiled for
TCG only (CONFIG_TCG). I assume it is only called from TCG code -
otherwise it would already be semi-broken.
>
> Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
> ---
> Cc: Richard Henderson <rth@twiddle.net>
> Cc: Emilio G. Cota <cota@braap.org>
> Cc: Alex Bennée <alex.bennee@linaro.org>
> Cc: David Hildenbrand <david@redhat.com>
> ---
> accel/stubs/tcg-stub.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/accel/stubs/tcg-stub.c b/accel/stubs/tcg-stub.c
> index 677191a69c..e4bbf997aa 100644
> --- a/accel/stubs/tcg-stub.c
> +++ b/accel/stubs/tcg-stub.c
> @@ -22,3 +22,10 @@ void tb_flush(CPUState *cpu)
> void tlb_set_dirty(CPUState *cpu, target_ulong vaddr)
> {
> }
> +
> +void *probe_access(CPUArchState *env, target_ulong addr, int size,
> + MMUAccessType access_type, int mmu_idx, uintptr_t retaddr)
> +{
> + /* Handled by hardware accelerator. */
> + g_assert_not_reached();
> +}
>
Still, this makes sense to me as well
Reviewed-by: David Hildenbrand <david@redhat.com>
--
Thanks,
David / dhildenb
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] accel/tcg: Add stub for probe_access()
2020-04-23 7:49 ` David Hildenbrand
@ 2020-04-23 7:59 ` Philippe Mathieu-Daudé
2020-04-23 8:04 ` David Hildenbrand
0 siblings, 1 reply; 5+ messages in thread
From: Philippe Mathieu-Daudé @ 2020-04-23 7:59 UTC (permalink / raw)
To: David Hildenbrand
Cc: Beata Michalska, qemu-devel@nongnu.org Developers,
Emilio G . Cota, Paolo Bonzini, Alex Bennée,
Richard Henderson
On Thu, Apr 23, 2020 at 9:49 AM David Hildenbrand <david@redhat.com> wrote:
>
> On 23.04.20 09:10, Philippe Mathieu-Daudé wrote:
> > The TCG helpers where added in b92e5a22ec3 in softmmu_template.h.
> > probe_write() was added in there in 3b4afc9e75a to be moved out
> > to accel/tcg/cputlb.c in 3b08f0a9254, and was later refactored
> > as probe_access() in c25c283df0f.
> > Since it is a TCG specific helper, add a stub to avoid failures
> > when building without TCG, such:
> >
> > target/arm/helper.o: In function `probe_read':
> > include/exec/exec-all.h:345: undefined reference to `probe_access'
>
> I think you're missing the most important commit:
>
> 0d57b4999220 ("target/arm: Add support for DC CVAP & DC CVADP ins")
>
> I do wonder if dccvap_writefn() and calling code should be compiled for
> TCG only (CONFIG_TCG). I assume it is only called from TCG code -
> otherwise it would already be semi-broken.
I can only recommend you to read the thread after this previous patch,
as I don't have the knowledge to explain...:
https://www.mail-archive.com/qemu-devel@nongnu.org/msg689115.html
>
> >
> > Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
> > ---
> > Cc: Richard Henderson <rth@twiddle.net>
> > Cc: Emilio G. Cota <cota@braap.org>
> > Cc: Alex Bennée <alex.bennee@linaro.org>
> > Cc: David Hildenbrand <david@redhat.com>
> > ---
> > accel/stubs/tcg-stub.c | 7 +++++++
> > 1 file changed, 7 insertions(+)
> >
> > diff --git a/accel/stubs/tcg-stub.c b/accel/stubs/tcg-stub.c
> > index 677191a69c..e4bbf997aa 100644
> > --- a/accel/stubs/tcg-stub.c
> > +++ b/accel/stubs/tcg-stub.c
> > @@ -22,3 +22,10 @@ void tb_flush(CPUState *cpu)
> > void tlb_set_dirty(CPUState *cpu, target_ulong vaddr)
> > {
> > }
> > +
> > +void *probe_access(CPUArchState *env, target_ulong addr, int size,
> > + MMUAccessType access_type, int mmu_idx, uintptr_t retaddr)
> > +{
> > + /* Handled by hardware accelerator. */
> > + g_assert_not_reached();
> > +}
> >
>
> Still, this makes sense to me as well
>
> Reviewed-by: David Hildenbrand <david@redhat.com>
>
> --
> Thanks,
>
> David / dhildenb
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] accel/tcg: Add stub for probe_access()
2020-04-23 7:59 ` Philippe Mathieu-Daudé
@ 2020-04-23 8:04 ` David Hildenbrand
2020-04-23 8:17 ` Paolo Bonzini
0 siblings, 1 reply; 5+ messages in thread
From: David Hildenbrand @ 2020-04-23 8:04 UTC (permalink / raw)
To: Philippe Mathieu-Daudé
Cc: Beata Michalska, qemu-devel@nongnu.org Developers,
Emilio G . Cota, Paolo Bonzini, Alex Bennée,
Richard Henderson
On 23.04.20 09:59, Philippe Mathieu-Daudé wrote:
> On Thu, Apr 23, 2020 at 9:49 AM David Hildenbrand <david@redhat.com> wrote:
>>
>> On 23.04.20 09:10, Philippe Mathieu-Daudé wrote:
>>> The TCG helpers where added in b92e5a22ec3 in softmmu_template.h.
>>> probe_write() was added in there in 3b4afc9e75a to be moved out
>>> to accel/tcg/cputlb.c in 3b08f0a9254, and was later refactored
>>> as probe_access() in c25c283df0f.
>>> Since it is a TCG specific helper, add a stub to avoid failures
>>> when building without TCG, such:
>>>
>>> target/arm/helper.o: In function `probe_read':
>>> include/exec/exec-all.h:345: undefined reference to `probe_access'
>>
>> I think you're missing the most important commit:
>>
>> 0d57b4999220 ("target/arm: Add support for DC CVAP & DC CVADP ins")
>>
>> I do wonder if dccvap_writefn() and calling code should be compiled for
>> TCG only (CONFIG_TCG). I assume it is only called from TCG code -
>> otherwise it would already be semi-broken.
>
> I can only recommend you to read the thread after this previous patch,
> as I don't have the knowledge to explain...:
> https://www.mail-archive.com/qemu-devel@nongnu.org/msg689115.html
Yeah, me neither. Sounds wrong to me to have TCG-only code stick around
in !CONFIG_TCG builds. But I am pretty sure ARM people know what they
are doing.
--
Thanks,
David / dhildenb
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] accel/tcg: Add stub for probe_access()
2020-04-23 8:04 ` David Hildenbrand
@ 2020-04-23 8:17 ` Paolo Bonzini
0 siblings, 0 replies; 5+ messages in thread
From: Paolo Bonzini @ 2020-04-23 8:17 UTC (permalink / raw)
To: David Hildenbrand, Philippe Mathieu-Daudé
Cc: Beata Michalska, Emilio G . Cota, Alex Bennée,
qemu-devel@nongnu.org Developers, Richard Henderson
On 23/04/20 10:04, David Hildenbrand wrote:
>> I can only recommend you to read the thread after this previous patch,
>> as I don't have the knowledge to explain...:
>> https://www.mail-archive.com/qemu-devel@nongnu.org/msg689115.html
> Yeah, me neither. Sounds wrong to me to have TCG-only code stick around
> in !CONFIG_TCG builds. But I am pretty sure ARM people know what they
> are doing.
It's better if helpers are left out via obj-$(CONFIG_TCG), but it's not
the end of the world if they aren't---as long as it compiles of course!
This case is definitely borderline.
Paolo
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2020-04-23 8:19 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
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2020-04-23 7:10 [PATCH] accel/tcg: Add stub for probe_access() Philippe Mathieu-Daudé
2020-04-23 7:49 ` David Hildenbrand
2020-04-23 7:59 ` Philippe Mathieu-Daudé
2020-04-23 8:04 ` David Hildenbrand
2020-04-23 8:17 ` Paolo Bonzini
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