Re: [PATCH 5.15 0/5] Support static calls with LLVM-built kernels

Greg KH
2024-03-29T12:43:51Z

On Wed, Mar 13, 2024 at 07:42:50AM -0300, Thadeu Lima de Souza Cascardo wrote:
> Otherwise, we see warnings like this:
>
> [ 0.000000][ T0] ------------[ cut here ]------------
> [ 0.000000][ T0] unexpected static_call insn opcode 0xf at kvm_vcpu_reload_apic_access_page+0x17/0x30
> [ 0.000000][ T0] WARNING: CPU: 0 PID: 0 at arch/x86/kernel/static_call.c:88 __static_call_validate+0x68/0x70
> [ 0.000000][ T0] Modules linked in:
> [ 0.000000][ T0] CPU: 0 PID: 0 Comm: swapper Not tainted 5.15.151-00083-gf200c7260296 #68 fe3cb25cf78cb710722bb5acd1cadddd35172924
> [ 0.000000][ T0] RIP: 0010:__static_call_validate+0x68/0x70
> [ 0.000000][ T0] Code: 0f b6 4a 04 81 f1 c0 00 00 00 09 c1 74 cc 80 3d be 2c 02 02 00 75 c3 c6 05 b5 2c 02 02 01 48 c7 c7 38 4f c3 82 e8 e8 c8 09 00 <0f> 0b c3 00 00 cc cc 00 53 48 89 fb 48 63 15 31 71 06 02 e8 b0 b8
> [ 0.000000][ T0] RSP: 0000:ffffffff82e03e70 EFLAGS: 00010046 ORIG_RAX: 0000000000000000
> [ 0.000000][ T0] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000002
> [ 0.000000][ T0] RDX: 0000000000000000 RSI: ffffffff82e03ce0 RDI: 0000000000000001
> [ 0.000000][ T0] RBP: 0000000000000001 R08: 00000000ffffffff R09: ffffffff82eaab70
> [ 0.000000][ T0] R10: ffffffff82e2e900 R11: 205d305420202020 R12: ffffffff82e51960
> [ 0.000000][ T0] R13: ffffffff81038987 R14: ffffffff81038987 R15: 0000000000000001
> [ 0.000000][ T0] FS: 0000000000000000(0000) GS:ffffffff83726000(0000) knlGS:0000000000000000
> [ 0.000000][ T0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 0.000000][ T0] CR2: ffff888000014be8 CR3: 00000000037b2000 CR4: 00000000000000a0
> [ 0.000000][ T0] Call Trace:
> [ 0.000000][ T0] <TASK>
> [ 0.000000][ T0] ? __warn+0x75/0xe0
> [ 0.000000][ T0] ? report_bug+0x81/0xe0
> [ 0.000000][ T0] ? kvm_vcpu_reload_apic_access_page+0x17/0x30
> [ 0.000000][ T0] ? kvm_vcpu_reload_apic_access_page+0x17/0x30
> [ 0.000000][ T0] ? early_fixup_exception+0x44/0xa0
> [ 0.000000][ T0] ? early_idt_handler_common+0x2f/0x40
> [ 0.000000][ T0] ? kvm_vcpu_reload_apic_access_page+0x17/0x30
> [ 0.000000][ T0] ? kvm_vcpu_reload_apic_access_page+0x17/0x30
> [ 0.000000][ T0] ? __static_call_validate+0x68/0x70
> [ 0.000000][ T0] ? arch_static_call_transform+0x5c/0x90
> [ 0.000000][ T0] ? __static_call_init+0x1ec/0x230
> [ 0.000000][ T0] ? static_call_init+0x32/0x70
> [ 0.000000][ T0] ? setup_arch+0x36/0x4f0
> [ 0.000000][ T0] ? start_kernel+0x67/0x400
> [ 0.000000][ T0] ? secondary_startup_64_no_verify+0xb1/0xbb
> [ 0.000000][ T0] </TASK>
> [ 0.000000][ T0] ---[ end trace 8c8589c01f370686 ]---
>

Now queued up, thanks.

greg k-h