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package/qemu: drop x86_core_avx2 exclusion

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Commit 1f7efaf89f ("package/qemu: do not support x86_steamroller or
x86_core_avx2") excluded BR2_x86_core_avx2 from
BR2_PACKAGE_HOST_QEMU_ARCH_SUPPORTS because binaries built for that CPU
variant crashed under qemu-user. This was done at the time of Qemu 4.2,
whose TCG engine did not implement AVX at all.

Since Qemu 7.2, the TCG engine implements AVX, AVX2, F16C, FMA3 and
VAES. In Qemu 11.0.0 (the version we currently package) and 11.1.1,
target/i386/cpu.c has:

  #define TCG_EXT_FEATURES (... | CPUID_EXT_AVX | CPUID_EXT_F16C | \
            CPUID_EXT_FMA | ...)
  #define TCG_7_0_EBX_FEATURES (... | CPUID_7_0_EBX_BMI1 | \
            CPUID_7_0_EBX_BMI2 | CPUID_7_0_EBX_AVX2 | ...)

which covers everything gcc generates for -march=core-avx2.

In addition, the exclusion was inconsistent: gcc's core-avx2 is a
deprecated alias for haswell, both variants select exactly the same
BR2_X86_CPU_HAS_* symbols in arch/Config.in.x86, and haswell was never
excluded. The same goes for broadwell, skylake, zen*, x86-64-v3, ...,
which all enable AVX2 and build fine on the autobuilders.

So drop the BR2_x86_core_avx2 exclusion.

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Assisted-by: Claude:claude-opus-5
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 8d80efe017)
Signed-off-by: Raphaël Mélotte <raphael.melotte@mind.be>
This commit is contained in:
Yegor Yefremov
2026-09-17 09:53:24 +02:00
committed by Raphaël Mélotte
parent 651efc907f
commit 07b358a539
1 changed files with 1 additions and 1 deletions
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package/qemu/Config.in.host
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@@ -22,7 +22,7 @@ config BR2_PACKAGE_HOST_QEMU_ARCH_SUPPORTS
default y if BR2_sparc64
default y if BR2_xtensa
default y if BR2_x86_64
depends on !BR2_x86_steamroller && !BR2_x86_core_avx2
depends on !BR2_x86_steamroller
# The Qemu TCG engine does not implement the AVX512
# instruction set, so binaries built for such CPUs cannot be
# emulated.