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From: Richard Henderson <richard.henderson@linaro.org>
To: qemu-devel@nongnu.org
Cc: pbonzini@redhat.com, mark.cave-ayland@ilande.co.uk, berrange@redhat.com,
philmd@linaro.org, thuth@redhat.com
Subject: [PATCH v2 12/14] meson: Disallow 64-bit on 32-bit TCG emulation
Date: Sun, 2 Feb 2025 19:18:19 -0800
Message-ID: <20250203031821.741477-13-richard.henderson@linaro.org>
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For system mode, we can rarely support the amount of RAM that
the guest requires. 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.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
---
meson.build | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/meson.build b/meson.build
index 5ca3cc3f34..866b8ce477 100644
--- a/meson.build
+++ b/meson.build
@@ -3176,6 +3176,9 @@ if host_os =3D=3D 'windows'
endif
endif
=20
+# Detect host pointer size for the target configuration loop.
+host_long_bits =3D cc.sizeof('void *') * 8
+
########################
# Target configuration #
########################
@@ -3268,11 +3271,18 @@ foreach target : target_dirs
}
endif
=20
+ config_target +=3D keyval.load('configs/targets' / target + '.mak')
+
target_kconfig =3D []
foreach sym: accelerators
if sym =3D=3D 'CONFIG_TCG'
+ # Disallow 64-bit on 32-bit TCG emulation.
+ if host_long_bits < config_target['TARGET_LONG_BITS'].to_int()
+ continue
+ endif
config_target +=3D { 'CONFIG_TCG_TARGET': 'y' }
elif target not in accelerator_targets.get(sym, [])
+ # Other accelerators are handled by accelerator_targets.
continue
endif
config_target +=3D { sym: 'y' }
@@ -3286,9 +3296,6 @@ foreach target : target_dirs
error('No accelerator available for target @0@'.format(target))
endif
=20
- config_target +=3D keyval.load('configs/targets' / target + '.mak')
- config_target +=3D { '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')
@@ -3301,6 +3308,7 @@ foreach target : target_dirs
actual_target_dirs +=3D target
=20
# Add default keys
+ config_target +=3D { 'TARGET_' + config_target['TARGET_ARCH'].to_upper()=
: 'y' }
if 'TARGET_BASE_ARCH' not in config_target
config_target +=3D {'TARGET_BASE_ARCH': config_target['TARGET_ARCH']}
endif
--=20
2.43.0