Hello all,

I found the latest Qemu release can't bootup the VM with latest guest kernel(>5.13).

The normal v6.0.0 release is good to bootup the latest guest kernel.

There are two issues were found
1. Guest kernel panic.
2. kvm disabled by bios

The panic log as below:
[    2.250024] BUG: unable to handle page fault for address: ffffffffac06c55f
[    2.252226] #PF: supervisor write access in kernel mode
[    2.253892] #PF: error_code(0x0003) - permissions violation
[    2.255671] PGD 5940e067 P4D 5940f067 PUD 59410063 PMD 580001e1
[    2.257567] Oops: 0003 [#1] SMP NOPTI
[    2.258738] CPU: 2 PID: 313 Comm: systemd-udevd Not tainted 5.13.0-rc1+ #1
[    2.260899] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015
[    2.263375] RIP: 0010:__send_ipi_mask+0x1bf/0x240
[    2.264855] Code: c0 48 c7 44 24 18 00 00 00 00 e9 48 ff ff ff 48 89 d0 4c 09 c8 74 1b 49 63 d7 48 63 74 24 0c b8 0a 00 00 00 4c 89 cb 4c 89 d1 <0f> 01 d9 48 85 c0 78 4a 48 f7 04 24 00 02 00 00 0f 84 80 fe ff ff
[    2.270643] RSP: 0018:ff591a62c0193ab0 EFLAGS: 00010006
[    2.272277] RAX: 000000000000000a RBX: 0000000000000009 RCX: 0000000000000000
[    2.274482] RDX: 0000000000000000 RSI: 00000000000000fc RDI: ff13a83dc003c830
[    2.276663] RBP: ff591a62c0193b08 R08: 0000000000000004 R09: 0000000000000009
[    2.278866] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[    2.281065] R13: ff13a83dc003c830 R14: 0000000000011580 R15: 0000000000000000
[    2.283272] FS:  00007f23ebd07940(0000) GS:ff13a83e3bd00000(0000) knlGS:0000000000000000
[    2.285794] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.287574] CR2: ffffffffac06c55f CR3: 0000000106ce2003 CR4: 0000000000771ee0
[    2.289757] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[    2.291972] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[    2.294177] PKRU: 55555554
[    2.295043] Call Trace:
[    2.295820]  kvm_smp_send_call_func_ipi+0xe/0x60
[    2.297220]  smp_call_function_many_cond+0x25d/0x2a0
[    2.298772]  ? flush_tlb_one_kernel+0x20/0x20
[    2.300145]  on_each_cpu_cond_mask+0x1e/0x20
[    2.301514]  flush_tlb_kernel_range+0x8d/0x90
[    2.302799]  __purge_vmap_area_lazy+0xc1/0x6a0
[    2.304097]  ? cpumask_next+0x1f/0x20
[    2.305160]  ? purge_fragmented_blocks_allcpus+0x3d/0x210
[    2.306686]  _vm_unmap_aliases+0xf1/0x120
[    2.307861]  change_page_attr_set_clr+0x95/0x280
[    2.309203]  set_memory_ro+0x26/0x30
[    2.310259]  ? 0xffffffffc00f7000
[    2.311214]  module_enable_ro.part.58+0x62/0xc0
[    2.312417]  do_init_module+0x17a/0x230
[    2.313460]  load_module+0x1a30/0x1b00
[    2.314463]  ? __do_sys_finit_module+0xad/0x110
[    2.315702]  __do_sys_finit_module+0xad/0x110
[    2.316890]  do_syscall_64+0x39/0x80
[    2.317868]  entry_SYSCALL_64_after_hwframe+0x44/0xae
[    2.319226] RIP: 0033:0x7f23ea8f32bd


I also used the bisect to get the bad commit id: f5cc5a5c168674f84bf061cdb307c2d25fba5448

This issue is known issue? or some fixs are ready to fix those issues? thanks!

Regards,

Yang