On 21/05/2021 10:06, Florian Bezdeka wrote:
> Qemu 5.2 adds a new CPU feature named kvm-asyncpf-int. The qemu 5.2
> changelog says:
>
> A new KVM feature which improves the handling of asynchronous page
> faults is available with -cpu ...,kvm-async-pf-int. This requires
> Linux 5.8.
>
> If this feature is enabled, the (jailhouse enabled) guest kernel will
> run into the following situation during "jailhouse cell create". To
> avoid that we need to disable this cpu feature when qemu supports it.
>
> jailhouse console output:
>
> FATAL: Unhandled MSR write: 4b564d02
> RIP: 0xffffffff8103e117 RSP: 0xffffc900000ffe60 FLAGS: 46
> RAX: 0x0000000000000000 RBX: 0x0000000000000003 RCX: 0x000000004b564d02
> RDX: 0x0000000000000000 RSI: 0x0000000000000000 RDI: 0x000000004b564d02
> CS: 10 BASE: 0x0000000000000000 AR-BYTES: a09b EFER.LMA 1
> CR0: 0x0000000080050033 CR3: 0x000000000200a002 CR4: 0x0000000000372ea0
> EFER: 0x0000000000000d01
>
> Stack trace:
>
> [ 41.849660] #PF: supervisor instruction fetch in kernel mode
> [ 41.850301] #PF: error_code(0x0010) - not-present page
> [ 41.850839] PGD 0 P4D 0
> [ 41.851121] Oops: 0010 [#1] PREEMPT SMP PTI
> [ 41.851570] CPU: 3 PID: 25 Comm: cpuhp/3 Tainted: G O
> 5.10.31 #1
> [ 41.852326] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS
> 1.14.0-2.fc34 04/01/2014
> [ 41.853207] RIP: 0010:0x0
> [ 41.853494] Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
> [ 41.854287] RSP: 0018:ffffc900000ffe60 EFLAGS: 00010046
> [ 41.854962] RAX: 0000000000000000 RBX: 0000000000000003 RCX:
> 000000004b564d02
> [ 41.855605] RDX: 0000000000000000 RSI: 0000000000000000 RDI:
> 000000004b564d02
> [ 41.856242] RBP: ffff88803f9971a0 R08: ffff88803f9971c8 R09:
> ffff888002c00058
> [ 41.856873] R10: 0000000000000000 R11: 0000000000000000 R12:
> ffffffff8103e827
> [ 41.857511] R13: ffffffff8106efa1 R14: ffff88803f9971c8 R15:
> 0000000000000000
> [ 41.858152] FS: 0000000000000000(0000) GS:ffff88803f980000(0000)
> knlGS:0000000000000000
> [ 41.859131] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 41.859738] CR2: ffffffffffffffd6 CR3: 000000000200a002 CR4:
> 0000000000372ea0
> [ 41.860378] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
> 0000000000000000
> [ 41.860929] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
> 0000000000000400
> [ 41.861488] Call Trace:
> [ 41.861698] kvm_pv_disable_apf.part.13+0x11/0x2f
> [ 41.862084] kvm_cpu_down_prepare+0x42/0x50
> [ 41.862415] cpuhp_invoke_callback+0xc1/0x238
> [ 41.862760] ? smpboot_unregister_percpu_thread+0x59/0x59
> [ 41.863187] cpuhp_thread_fun+0xdd/0x117
> [ 41.863518] smpboot_thread_fn+0x190/0x1a5
> [ 41.863847] kthread+0x112/0x11a
> [ 41.864109] ? kthread_unpark+0x62/0x62
> [ 41.864412] ret_from_fork+0x22/0x30
> [ 41.864765] Modules linked in: af_packet snd_hda_codec_generic evdev
> pcspkr snd_hda_intel snd_intel_dspcfg serio_raw snd_hda_codec sg snd_hda_core
> snd_pcm snd_timer snd soundcore intel_agp intel_gtt button jailhouse(O)
> ip_tables x_tables ipv6 psmouse e1000e ptp i2c_i801 i2c_smbus lpc_ich pps_core
> [ 41.866836] CR2: 0000000000000000
> [ 41.867105] ---[ end trace a63d134522cf2445 ]---
> [ 41.867466] RIP: 0010:0x0
> [ 41.867680] Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
> [ 41.868216] RSP: 0018:ffffc900000ffe60 EFLAGS: 00010046
> [ 41.868629] RAX: 0000000000000000 RBX: 0000000000000003 RCX:
> 000000004b564d02
> [ 41.869185] RDX: 0000000000000000 RSI: 0000000000000000 RDI:
> 000000004b564d02
> [ 41.869736] RBP: ffff88803f9971a0 R08: ffff88803f9971c8 R09:
> ffff888002c00058
> [ 41.870325] R10: 0000000000000000 R11: 0000000000000000 R12:
> ffffffff8103e827
> [ 41.870993] R13: ffffffff8106efa1 R14: ffff88803f9971c8 R15:
> 0000000000000000
> [ 41.871501] FS: 0000000000000000(0000) GS:ffff88803f980000(0000)
> knlGS:0000000000000000
> [ 41.872076] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 41.872477] CR2: ffffffffffffffd6 CR3: 000000000200a002 CR4:
> 0000000000372ea0
> [ 41.872972] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
> 0000000000000000
> [ 41.873469] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
> 0000000000000400
>
> Signed-off-by: Florian Bezdeka <[email protected]>
> ---
> start-qemu.sh | 9 ++++++++-
> 1 file changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/start-qemu.sh b/start-qemu.sh
> index 7e95ec8..4e90fe3 100755
> --- a/start-qemu.sh
> +++ b/start-qemu.sh
> @@ -26,8 +26,15 @@ case "$1" in
> x86|x86_64|amd64)
> DISTRO_ARCH=amd64
> QEMU=qemu-system-x86_64
> +
> CPU_FEATURES="-kvm-pv-eoi,-kvm-pv-ipi,-kvm-asyncpf,-kvm-steal-time,-kvmclock"
> +
> + # qemu >= 5.2 has kvm-asyncpf-int which needs to be disabled
> + if ${QEMU} -cpu help | grep kvm-asyncpf-int > /dev/null; then
> + CPU_FEATURES="${CPU_FEATURES},-kvm-asyncpf-int"
This should also be mentioned in the README.md of the Jailhouse main
project.
Thanks
Ralf
> + fi
> +
> QEMU_EXTRA_ARGS=" \
> - -cpu
> host,-kvm-pv-eoi,-kvm-pv-ipi,-kvm-asyncpf,-kvm-steal-time,-kvmclock \
> + -cpu host,${CPU_FEATURES} \
> -smp 4 \
> -enable-kvm -machine q35,kernel_irqchip=split \
> -serial vc \
>
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