Re: [PATCH v6 00/12] SVM cleanup and INVPCID feature support

Jim Mattson
2021-01-19T23:03:41Z

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On Mon, Sep 14, 2020 at 11:33 AM Babu Moger <babu.moger@amd.com> wrote:

> Thanks Paolo. Tested Guest/nested guest/kvm units tests. Everything works
> as expected.

Debian 9 does not like this patch set. As a kvm guest, it panics on a
Milan CPU unless booted with 'nopcid'. Gmail mangles long lines, so
please see the attached kernel log snippet. Debian 10 is fine, so I
assume this is a guest bug.

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[ 1.235726] ------------[ cut here ]------------
[ 1.237515] kernel BUG at /build/linux-dqnRSc/linux-4.9.228/arch/x86/kernel/alternative.c:709!
[ 1.240926] invalid opcode: 0000 [#1] SMP
[ 1.243301] Modules linked in:
[ 1.244585] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 4.9.0-13-amd64 #1 Debian 4.9.228-1
[ 1.247657] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 1.251249] task: ffff909363e94040 task.stack: ffffa41bc0194000
[ 1.253519] RIP: 0010:[<ffffffff8fa2e40c>] [<ffffffff8fa2e40c>] text_poke+0x18c/0x240
[ 1.256593] RSP: 0018:ffffa41bc0197d90 EFLAGS: 00010096
[ 1.258657] RAX: 000000000000000f RBX: 0000000001020800 RCX: 00000000feda3203
[ 1.261388] RDX: 00000000178bfbff RSI: 0000000000000000 RDI: ffffffffff57a000
[ 1.264168] RBP: ffffffff8fbd3eca R08: 0000000000000000 R09: 0000000000000003
[ 1.266983] R10: 0000000000000003 R11: 0000000000000112 R12: 0000000000000001
[ 1.269702] R13: ffffa41bc0197dcf R14: 0000000000000286 R15: ffffed1c40407500
[ 1.272572] FS: 0000000000000000(0000) GS:ffff909366300000(0000) knlGS:0000000000000000
[ 1.275791] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1.278032] CR2: 0000000000000000 CR3: 0000000010c08000 CR4: 00000000003606f0
[ 1.280815] Stack:
[ 1.281630] ffffffff8fbd3eca 0000000000000005 ffffa41bc0197e03 ffffffff8fbd3ecb
[ 1.284660] 0000000000000000 0000000000000000 ffffffff8fa2e835 ccffffff8fad4326
[ 1.287729] 1ccd0231874d55d3 ffffffff8fbd3eca ffffa41bc0197e03 ffffffff90203844
[ 1.290852] Call Trace:
[ 1.291782] [<ffffffff8fbd3eca>] ? swap_entry_free+0x12a/0x300
[ 1.294900] [<ffffffff8fbd3ecb>] ? swap_entry_free+0x12b/0x300
[ 1.297267] [<ffffffff8fa2e835>] ? text_poke_bp+0x55/0xe0
[ 1.299473] [<ffffffff8fbd3eca>] ? swap_entry_free+0x12a/0x300
[ 1.301896] [<ffffffff8fa2b64c>] ? arch_jump_label_transform+0x9c/0x120
[ 1.304557] [<ffffffff9073e81f>] ? set_debug_rodata+0xc/0xc
[ 1.306790] [<ffffffff8fb81d92>] ? __jump_label_update+0x72/0x80
[ 1.309255] [<ffffffff8fb8206f>] ? static_key_slow_inc+0x8f/0xa0
[ 1.311680] [<ffffffff8fbd7a57>] ? frontswap_register_ops+0x107/0x1d0
[ 1.314281] [<ffffffff9077078c>] ? init_zswap+0x282/0x3f6
[ 1.316547] [<ffffffff9077050a>] ? init_frontswap+0x8c/0x8c
[ 1.318784] [<ffffffff8fa0223e>] ? do_one_initcall+0x4e/0x180
[ 1.321067] [<ffffffff9073e81f>] ? set_debug_rodata+0xc/0xc
[ 1.323366] [<ffffffff9073f08d>] ? kernel_init_freeable+0x16b/0x1ec
[ 1.325873] [<ffffffff90011d50>] ? rest_init+0x80/0x80
[ 1.327989] [<ffffffff90011d5a>] ? kernel_init+0xa/0x100
[ 1.330092] [<ffffffff9001f424>] ? ret_from_fork+0x44/0x70
[ 1.332311] Code: 00 0f a2 4d 85 e4 74 4a 0f b6 45 00 41 38 45 00 75 19 31 c0 83 c0 01 48 63 d0 49 39 d4 76 33 41 0f b6 4c 15 00 38 4c 15 00 74 e9 <0f> 0b 48 89 ef e8 da d6 19 00 48 8d bd 00 10 00 00 48 89 c3 e8
[ 1.342818] RIP [<ffffffff8fa2e40c>] text_poke+0x18c/0x240
[ 1.345859] RSP <ffffa41bc0197d90>
[ 1.347285] ---[ end trace 0a1c5ab5eb16de89 ]---
[ 1.349169] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
[ 1.349169]
[ 1.352885] Kernel Offset: 0xea00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
[ 1.357039] ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
[ 1.357039]