Yeah, I was going to say something about that. CPUID shouldn't advertise features that we don't support. For instance, that change tells CPUID to say we support AVX, but the decoder has no idea what to do with those instructions and will trigger an exception if one is executed. I noticed a bunch of undefined instruction exceptions in my own workload that weren't happening before, and I wonder if that's the cause.
I'm not sure how that change helps support KVM in SE mode. Perhaps it should be reverted? Can you explain why it's necessary Alex? If it is, maybe we can reshape it a bit to avoid these side effects. Gabe On Wed, Dec 10, 2014 at 12:43 AM, 马久跃 via gem5-dev <[email protected]> wrote: > Hi everyone, > > I found "x86_64-vmlinux-2.6.28.4" panic when apply changeset 10552: cpuid, > x86: Enabling more features in CPUid. (2.6.22.9 works fine) > The gem5 also report "warn: x86 cpuid: unimplemented function 13", and > kernel report BUG at arch/x86/kernel/xsave.c:323 as following. > > Can anybody check/fix this bug? > > Thanks. > > -------------------------------- KERNEL OUTPUT > ---------------------------------- > MPTABLE: APIC at: 0xFEE00000 > Processor #0 (Bootup-CPU) > I/O APIC #1 Version 17 at 0xFEC00000. > Processors: 1 > Allocating PCI resources starting at c4000000 (gap: c0000000:3fff0000) > Built 1 zonelists in Zone order, mobility grouping on. Total pages: 127500 > Kernel command line: earlyprintk=ttyS0 console=ttyS0 lpj=7999923 > root=/dev/hda1 > Initializing CPU#0 > FP/SSE not shown under xsave features 0x800500330000000d > ------------[ cut here ]------------ > kernel BUG at arch/x86/kernel/xsave.c:323! > invalid opcode: 0000 [#1] > last sysfs file: > CPU 0 > Modules linked in: > Pid: 0, comm: swapper Tainted: G W 2.6.28.4 #2 > RIP: 0010:[<ffffffff80577b45>] [<ffffffff80577b45>] > xsave_cntxt_init+0x35/0x130 > RSP: 0018:ffffffff80769f48 EFLAGS: 000000b8 > RAX: 000000000000003c RBX: 0000000000000000 RCX: ffffffff807cd460 > RDX: 00000000ffffffff RSI: 0000000000000d5c RDI: ffffffff80702180 > RBP: 0000000000000000 R08: 00000000ffffffff R09: 00000000000003fd > R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 > R13: ffffffffffffffff R14: 0000000000000000 R15: 0000000000000000 > FS: 0000000000000000(0000) GS:ffffffff807bf020(0000) > knlGS:0000000000000000 > CS: 0010 DS: 0018 ES: 0018 CR0: 0000000080050033 > CR2: 0000000000000000 CR3: 0000000000201000 CR4: 00000000000006a0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 0000000000000000 DR7: 0000000000000000 > Process swapper (pid: 0, threadinfo ffffffff80768000, task > ffffffff806f5380) > Stack: > 0000000000000000 ffffffff8078f133 ffffffff80795000 ffffffff8078fe72 > 8000896f59002087 00000000ffffffff 8022ee0000104a50 ffffffff80794000 > ffffffff80795000 ffffffff8076a98d 0000000000000000 ffffffff80795000 > Call Trace: > [<ffffffff8078f133>] fpu_init+0x3e/0x8e [<ffffffff8078fe72>] > cpu_init+0x222/0x240 [<ffffffff8076a98d>] start_kernel+0x16f/0x2d9 > [<ffffffff8076a407>] x86_64_start_kernel+0xd9/0xdfCode: 48 c1 e2 20 89 c0 > 48 > 8d 34 02 48 89 f0 48 89 35 12 a6 24 00 83 e0 03 48 83 f8 03 74 12 48 c7 c7 > 50 74 67 80 31 c0 e8 9c 30 01 00 <0f> 0b eb fe f6 05 57 b7 1e 00 04 48 c7 > 05 > e5 a5 24 00 03 00 00 > RIP [<ffffffff80577b45>] xsave_cntxt_init+0x35/0x130 > RSP <ffffffff80769f48> > ---[ end trace 4eaa2a86a8e2da22 ]--- > Kernel panic - not syncing: Attempted to kill the idle task! > > > ---- > Jiuyue > > > _______________________________________________ > gem5-dev mailing list > [email protected] > http://m5sim.org/mailman/listinfo/gem5-dev > _______________________________________________ gem5-dev mailing list [email protected] http://m5sim.org/mailman/listinfo/gem5-dev
