On Thu, Sep 13, 2018 at 4:46 PM, Anuj Mittal <anuj.mit...@intel.com> wrote: > On 09/14/2018 06:50 AM, Andre McCurdy wrote: >> On Thu, Sep 13, 2018 at 3:16 PM, Martin Jansa <martin.ja...@gmail.com> wrote: >>> Is this different issue than what was discussed in: >>> https://www.mail-archive.com/openembedded-core@lists.openembedded.org/msg109516.html >>> >>> The message is slightly different (might be changed in newer qemu used now), >>> but the issue I had before was that features of selected -cpu and host cpu >>> didn't match and qemu failed with: >>> qemu-system-x86_64: warning: host doesn't support requested feature: >>> CPUID.01H:EDX.ss [bit 27] >>> when some features were missing and kvm was used. >>> > > The message is different in this case because that one was for KVM, this > one is when using user space emulation so it's checking what can be > emulated and what is being asked by way of -cpu parameter [1]. > >>> If it's the same root cause, then it's not a bug in qemu. >> >> Thanks. Looks like it could be the same issue - if qemu is running >> with KVM on a host which isn't natively compatible with the full >> core2duo feature set. > > Similar problem, but a different issue in my opinion. So these features > (lm, syscall) that we see warnings about are only seen when building for > 32 bit while running qemu-i386 for executing postinsts. > > Looking at qemu commit logs, it doesn't look like these two features are > supported with qemu-i386. So, I changed the qemu -cpu value that is used > with qemu-i386 to a lower denominator which still supports the > instruction set that we build for for 32 bit.
If KVM isn't involved then it does look like a qemu bug, ie the -cpu core2duo option enables features which the emulator doesn't support. Right? > [1] https://wiki.qemu.org/Documentation/TCG > [2] > https://github.com/qemu/qemu/commit/4586f157757acc5c8edcc954289c7aa51661235c > >> >> From the Yocto bug these warnings are coming from the nightly builds: >> >> https://bugzilla.yoctoproject.org/show_bug.cgi?id=12916 >> >> Has something changed recently? Have the nightly builds moved onto an >> AMD machine? >> >> >>> On Thu, Sep 13, 2018 at 11:33 PM Andre McCurdy <armccu...@gmail.com> wrote: >>>> >>>> On Thu, Sep 13, 2018 at 12:25 AM, Anuj Mittal <anuj.mit...@intel.com> >>>> wrote: >>>>> Fixes warnings in builds using core2-32 tune: >>>>> >>>>> warning: TCG doesn't support requested feature: >>>>> CPUID.80000001H:EDX.syscall [bit 11] >>>>> warning: TCG doesn't support requested feature: CPUID.80000001H:EDX.lm >>>>> [bit 29] >>>>> >>>>> when executing postinsts using qemu-i386. >>>>> >>>>> i386 target doesn't enable CPUID_EXT2_SYSCALL and CPUID_EXT2_LM [1] >>>>> while cpu choice of core2duo that we use for core2-32 TUNE does [2]. >>>>> Use n270 cpu instead to use with qemu which supports SSSE3 and doesn't >>>>> have these bits enabled [3]. >>>>> >>>>> [1] https://github.com/qemu/qemu/blob/master/target/i386/cpu.c#L739 >>>>> [2] https://github.com/qemu/qemu/blob/master/target/i386/cpu.c#L1439 >>>>> [3] https://github.com/qemu/qemu/blob/master/target/i386/cpu.c#L1603 >>>>> >>>>> Fixes [YOCTO #12916] >>>> >>>> Is this working around a bug in qemu? >>>> >>>>> Signed-off-by: Anuj Mittal <anuj.mit...@intel.com>> --- >>>>> meta/conf/machine/include/tune-core2.inc | 2 +- >>>>> 1 file changed, 1 insertion(+), 1 deletion(-) >>>>> >>>>> diff --git a/meta/conf/machine/include/tune-core2.inc >>>>> b/meta/conf/machine/include/tune-core2.inc >>>>> index c686bb4682..ddde719bde 100644 >>>>> --- a/meta/conf/machine/include/tune-core2.inc >>>>> +++ b/meta/conf/machine/include/tune-core2.inc >>>>> @@ -21,7 +21,7 @@ TUNE_FEATURES_tune-core2-32 = >>>>> "${TUNE_FEATURES_tune-x86} core2" >>>>> BASE_LIB_tune-core2-32 = "lib" >>>>> TUNE_PKGARCH_tune-core2-32 = "core2-32" >>>>> PACKAGE_EXTRA_ARCHS_tune-core2-32 = "${PACKAGE_EXTRA_ARCHS_tune-i686} >>>>> core2-32" >>>>> -QEMU_EXTRAOPTIONS_core2-32 = " -cpu core2duo" >>>>> +QEMU_EXTRAOPTIONS_core2-32 = " -cpu n270" >>>>> >>>>> AVAILTUNES += "core2-64" >>>>> TUNE_FEATURES_tune-core2-64 = "${TUNE_FEATURES_tune-x86-64} core2" >>>>> -- >>>>> 2.17.1 >>>>> >>>>> -- >>>>> _______________________________________________ >>>>> Openembedded-core mailing list >>>>> Openembedded-core@lists.openembedded.org >>>>> http://lists.openembedded.org/mailman/listinfo/openembedded-core >>>> -- >>>> _______________________________________________ >>>> Openembedded-core mailing list >>>> Openembedded-core@lists.openembedded.org >>>> http://lists.openembedded.org/mailman/listinfo/openembedded-core > -- _______________________________________________ Openembedded-core mailing list Openembedded-core@lists.openembedded.org http://lists.openembedded.org/mailman/listinfo/openembedded-core
