| Message ID | 20250204215359.1238808-12-richard.henderson@linaro.org |
|---|---|
| State | Superseded |
| Headers | show |
| Series | meson: Deprecate 32-bit host support | expand |
On 4/2/25 22:53, Richard Henderson wrote: > We deprecated i686 system mode support for qemu 8.0. However, to > make real cleanups to TCG we need to deprecate all 32-bit hosts. > > Reviewed-by: Thomas Huth <thuth@redhat.com> > Reviewed-by: Alex Bennée <alex.bennee@linaro.org> > Signed-off-by: Richard Henderson <richard.henderson@linaro.org> > --- > docs/about/deprecated.rst | 7 +++++++ > meson.build | 8 +++----- > 2 files changed, 10 insertions(+), 5 deletions(-) > > diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst > index 4a3c302962..7c61d0ba16 100644 > --- a/docs/about/deprecated.rst > +++ b/docs/about/deprecated.rst > @@ -204,6 +204,13 @@ is going to be so much slower it wouldn't make sense for any serious > instrumentation. Due to implementation differences there will also be > anomalies in things like memory instrumentation. > > +32-bit host operating systems (since 10.0) > +'''''''''''''''''''''''''''''''''''''''''' > + > +Keeping 32-bit host support alive is a substantial burden for the > +QEMU project. Thus QEMU will in future drop the support for all > +32-bit host systems. > + > System emulator CPUs > -------------------- > > diff --git a/meson.build b/meson.build > index aa1ca8355d..3347b0a553 100644 > --- a/meson.build > +++ b/meson.build > @@ -4843,14 +4843,12 @@ if host_arch == 'unknown' > message('configure has succeeded and you can continue to build, but') > message('QEMU will use a slow interpreter to emulate the target CPU.') > endif > -elif host_arch == 'mips' > +elif host_long_bits < 64 > message() > warning('DEPRECATED HOST CPU') > message() > - message('Support for CPU host architecture ' + cpu + ' is going to be') > - message('dropped as soon as the QEMU project stops supporting Debian 12') > - message('("Bookworm"). Going forward, the QEMU project will not guarantee') > - message('that QEMU will compile or work on this host CPU.') > + message('Support for 32-bit CPU host architecture ' + cpu + ' is going') > + message('to be dropped in a future QEMU release.') This change still allows us to remove 32-bit mips host support before the other architectures, right?
On 2/5/25 10:05, Philippe Mathieu-Daudé wrote: > On 4/2/25 22:53, Richard Henderson wrote: >> We deprecated i686 system mode support for qemu 8.0. However, to >> make real cleanups to TCG we need to deprecate all 32-bit hosts. >> >> Reviewed-by: Thomas Huth <thuth@redhat.com> >> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> >> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> >> --- >> docs/about/deprecated.rst | 7 +++++++ >> meson.build | 8 +++----- >> 2 files changed, 10 insertions(+), 5 deletions(-) >> >> diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst >> index 4a3c302962..7c61d0ba16 100644 >> --- a/docs/about/deprecated.rst >> +++ b/docs/about/deprecated.rst >> @@ -204,6 +204,13 @@ is going to be so much slower it wouldn't make sense for any serious >> instrumentation. Due to implementation differences there will also be >> anomalies in things like memory instrumentation. >> +32-bit host operating systems (since 10.0) >> +'''''''''''''''''''''''''''''''''''''''''' >> + >> +Keeping 32-bit host support alive is a substantial burden for the >> +QEMU project. Thus QEMU will in future drop the support for all >> +32-bit host systems. >> + >> System emulator CPUs >> -------------------- >> diff --git a/meson.build b/meson.build >> index aa1ca8355d..3347b0a553 100644 >> --- a/meson.build >> +++ b/meson.build >> @@ -4843,14 +4843,12 @@ if host_arch == 'unknown' >> message('configure has succeeded and you can continue to build, but') >> message('QEMU will use a slow interpreter to emulate the target CPU.') >> endif >> -elif host_arch == 'mips' >> +elif host_long_bits < 64 >> message() >> warning('DEPRECATED HOST CPU') >> message() >> - message('Support for CPU host architecture ' + cpu + ' is going to be') >> - message('dropped as soon as the QEMU project stops supporting Debian 12') >> - message('("Bookworm"). Going forward, the QEMU project will not guarantee') >> - message('that QEMU will compile or work on this host CPU.') >> + message('Support for 32-bit CPU host architecture ' + cpu + ' is going') >> + message('to be dropped in a future QEMU release.') > > This change still allows us to remove 32-bit mips host support before > the other architectures, right? No, bookworm goes into LTS in June 2026, which would match QEMU 11.1 release. If we add this now, we could (selectively) remove 32-bit support earlier than that. r~
On 5/2/25 19:12, Richard Henderson wrote: > On 2/5/25 10:05, Philippe Mathieu-Daudé wrote: >> On 4/2/25 22:53, Richard Henderson wrote: >>> We deprecated i686 system mode support for qemu 8.0. However, to >>> make real cleanups to TCG we need to deprecate all 32-bit hosts. >>> >>> Reviewed-by: Thomas Huth <thuth@redhat.com> >>> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> >>> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> >>> --- >>> docs/about/deprecated.rst | 7 +++++++ >>> meson.build | 8 +++----- >>> 2 files changed, 10 insertions(+), 5 deletions(-) >>> diff --git a/meson.build b/meson.build >>> index aa1ca8355d..3347b0a553 100644 >>> --- a/meson.build >>> +++ b/meson.build >>> @@ -4843,14 +4843,12 @@ if host_arch == 'unknown' >>> message('configure has succeeded and you can continue to build, >>> but') >>> message('QEMU will use a slow interpreter to emulate the target >>> CPU.') >>> endif >>> -elif host_arch == 'mips' >>> +elif host_long_bits < 64 >>> message() >>> warning('DEPRECATED HOST CPU') >>> message() >>> - message('Support for CPU host architecture ' + cpu + ' is going to >>> be') >>> - message('dropped as soon as the QEMU project stops supporting >>> Debian 12') >>> - message('("Bookworm"). Going forward, the QEMU project will not >>> guarantee') >>> - message('that QEMU will compile or work on this host CPU.') >>> + message('Support for 32-bit CPU host architecture ' + cpu + ' is >>> going') >>> + message('to be dropped in a future QEMU release.') >> >> This change still allows us to remove 32-bit mips host support before >> the other architectures, right? > No, bookworm goes into LTS in June 2026, which would match QEMU 11.1 > release. > If we add this now, we could (selectively) remove 32-bit support earlier > than that. Great. Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst index 4a3c302962..7c61d0ba16 100644 --- a/docs/about/deprecated.rst +++ b/docs/about/deprecated.rst @@ -204,6 +204,13 @@ is going to be so much slower it wouldn't make sense for any serious instrumentation. Due to implementation differences there will also be anomalies in things like memory instrumentation. +32-bit host operating systems (since 10.0) +'''''''''''''''''''''''''''''''''''''''''' + +Keeping 32-bit host support alive is a substantial burden for the +QEMU project. Thus QEMU will in future drop the support for all +32-bit host systems. + System emulator CPUs -------------------- diff --git a/meson.build b/meson.build index aa1ca8355d..3347b0a553 100644 --- a/meson.build +++ b/meson.build @@ -4843,14 +4843,12 @@ if host_arch == 'unknown' message('configure has succeeded and you can continue to build, but') message('QEMU will use a slow interpreter to emulate the target CPU.') endif -elif host_arch == 'mips' +elif host_long_bits < 64 message() warning('DEPRECATED HOST CPU') message() - message('Support for CPU host architecture ' + cpu + ' is going to be') - message('dropped as soon as the QEMU project stops supporting Debian 12') - message('("Bookworm"). Going forward, the QEMU project will not guarantee') - message('that QEMU will compile or work on this host CPU.') + message('Support for 32-bit CPU host architecture ' + cpu + ' is going') + message('to be dropped in a future QEMU release.') endif if not supported_oses.contains(host_os)