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meson: Disallow 64-bit on 32-bit emulation

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For system mode, we can rarely support the amount of RAM that
the guest requires. TCG emulation is restricted to round-robin
mode, which solves many of the atomicity issues, but not those
associated with virtio.  In any case, round-robin does nothing
to help the speed of emulation.

For user mode, most emulation does not succeed at all.  Most
of the time we cannot even load 64-bit non-PIE binaries due
to lack of a 64-bit address space.  Threads are run in
parallel, not round-robin, which means that atomicity
is not handled.

Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2025-02-02 15:09:23 -08:00
parent 175646f641
commit acce728cbc
1 changed files with 10 additions and 3 deletions
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13
meson.build
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@ -3185,6 +3185,9 @@ if host_os == 'windows'
endif
endif
# Detect host pointer size for the target configuration loop.
host_long_bits = cc.sizeof('void *') * 8
########################
# Target configuration #
########################
@ -3277,8 +3280,14 @@ foreach target : target_dirs
}
endif
config_target += keyval.load('configs/targets' / target + '.mak')
target_kconfig = []
foreach sym: accelerators
# Disallow 64-bit on 32-bit emulation and virtualization
if host_long_bits < config_target['TARGET_LONG_BITS'].to_int()
continue
endif
if sym == 'CONFIG_TCG' or target in accelerator_targets.get(sym, [])
config_target += { sym: 'y' }
config_all_accel += { sym: 'y' }
@ -3292,9 +3301,6 @@ foreach target : target_dirs
error('No accelerator available for target @0@'.format(target))
endif
config_target += keyval.load('configs/targets' / target + '.mak')
config_target += { 'TARGET_' + config_target['TARGET_ARCH'].to_upper(): 'y' }
if 'TARGET_NEED_FDT' in config_target and not fdt.found()
if default_targets
warning('Disabling ' + target + ' due to missing libfdt')
@ -3307,6 +3313,7 @@ foreach target : target_dirs
actual_target_dirs += target
# Add default keys
config_target += { 'TARGET_' + config_target['TARGET_ARCH'].to_upper(): 'y' }
if 'TARGET_BASE_ARCH' not in config_target
config_target += {'TARGET_BASE_ARCH': config_target['TARGET_ARCH']}
endif