linux/poky.git/meta/conf/machine/include/x86/tune-x86-64-v3.inc, branch genericarm64

tune-x86-64-v3.inc: set QEMU_EXTRAOPTIONS like other tune-* files

2023-01-12T23:08:58+00:00

* use Skylake-Client to match QB_CPU_KVM as changed in: https://git.openembedded.org/openembedded-core/commit/?id=6f2af1e5d1537b4d31e14946292bf58f0fd76fc9 * explicitly set -cpu instead of letting qemu to choose based on host cpu * check=false is still useful as e.g. on on AMD Threadripper 3970X: orc/0.4.33-r0 $ PSEUDO_UNLOAD=1 qemu-x86_64 -r 3.2.0 -cpu Skylake-Client -L recipe-sysroot -E LD_LIBRARY_PATH=recipe-sysroot//usr/lib:recipe-sysroot//lib orc/0.4.33-r0/build/meson-private/sanitycheckc_cross.exe qemu-x86_64: warning: TCG doesn't support requested feature: CPUID.01H:ECX.pcid [bit 17] qemu-x86_64: warning: TCG doesn't support requested feature: CPUID.01H:ECX.x2apic [bit 21] qemu-x86_64: warning: TCG doesn't support requested feature: CPUID.01H:ECX.tsc-deadline [bit 24] qemu-x86_64: warning: TCG doesn't support requested feature: CPUID.07H:EBX.hle [bit 4] qemu-x86_64: warning: TCG doesn't support requested feature: CPUID.07H:EBX.invpcid [bit 10] qemu-x86_64: warning: TCG doesn't support requested feature: CPUID.07H:EBX.rtm [bit 11] qemu-x86_64: warning: TCG doesn't support requested feature: CPUID.07H:EBX.rdseed [bit 18] qemu-x86_64: warning: TCG doesn't support requested feature: CPUID.80000001H:ECX.3dnowprefetch [bit 8] qemu-x86_64: warning: TCG doesn't support requested feature: CPUID.0DH:EAX.xsavec [bit 1] * if this still doesn't work for you on your host, you might need to downgrade DEFAULTTUNE to e.g. corei7-64 (all all the way back to core2-64), for more details see: https://www.openembedded.org/pipermail/openembedded-core/2018-April/150178.html * the leading space shouldn't be needed, I've kept it for consistency with other QEMU_EXTRAOPTIONS (From OE-Core rev: d1a52559670921389a66a4c26d37481d6611042a) Signed-off-by: Martin Jansa Signed-off-by: Alexandre Belloni Signed-off-by: Richard Purdie

conf/machine/include: add x86-64-v3 tunes (AVX, AVX2, BMI1, BMI2, F16C, FMA, LZCNT, MOVBE, XSAVE)

2022-12-31T17:08:29+00:00

Qemu 7.2 finally allows us to move beyond building for original Core 2/Core i7 era hardware, and this patch adds support for the newer generations. But first, a bit of background: Recently toolchains gained support for specifying x86-64 'levels' of instruction set support; v3 corresponds to 2013-era Haswell CPUs (and later), with AVX, AVX2 and a few other instructions that were introduced in that generation. I believe this is preferrable to picking a specific CPU model as the baseline. Here's Phoronix's feature article that explains the feature and the available levels: "Both LLVM Clang 12 and GCC 11 are ready to go in offering the new x86-64-v2, x86-64-v3, and x86-64-v4 targets. These x86_64 micro-architecture feature levels have been about coming up with a few "classes" of Intel/AMD CPU processor support rather than continuing to rely on just the x86_64 baseline or targeting a specific CPU family for optimizations. These new levels make it easier to raise the base requirements around Linux x86-64 whether it be for a Linux distribution or a particular software application where the developer/ISV may be wanting to compile with greater instruction set extensions enabled in catering to more recent Intel/AMD CPUs." https://www.phoronix.com/news/GCC-11-x86-64-Feature-Levels Here's gcc docs for it: https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html And here's the formal specification (click on the pdf link): https://gitlab.com/x86-psABIs/x86-64-ABI The actual tune file was created by copying corei7 tunes and doing search/replace on them. Qemu options were dropped as unnecessary. 32 bit tune was dropped as well, as there is no 32 bit only CPU that also supports these new instructions; all of the v3 capable chips are 64 bit. (From OE-Core rev: ac041f90e71dba83b7144c91f929de88aaeae519) Signed-off-by: Alexander Kanavin Signed-off-by: Richard Purdie