[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [qemu-s390x] [PATCH v1 for-2.11 3/3] s390x/tcg: fix DIA
From: |
Thomas Huth |
Subject: |
Re: [Qemu-devel] [qemu-s390x] [PATCH v1 for-2.11 3/3] s390x/tcg: fix DIAG 308 with > 1 VCPU (MTTCG) |
Date: |
Thu, 16 Nov 2017 21:54:30 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0 |
On 16.11.2017 18:05, David Hildenbrand wrote:
> Currently, multi threaded TCG with > 1 VCPU gets stuck during IPL, when
> the bios tries to switch to the loaded kernel via DIAG 308.
>
> As run_on_cpu() is used, we run into a deadlock after handling the reset.
> We need the iolock (just like KVM).
>
> Signed-off-by: David Hildenbrand <address@hidden>
> ---
> target/s390x/misc_helper.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/target/s390x/misc_helper.c b/target/s390x/misc_helper.c
> index 4afd90b969..d272851e1c 100644
> --- a/target/s390x/misc_helper.c
> +++ b/target/s390x/misc_helper.c
> @@ -103,7 +103,9 @@ void HELPER(diag)(CPUS390XState *env, uint32_t r1,
> uint32_t r3, uint32_t num)
> break;
> case 0x308:
> /* ipl */
> + qemu_mutex_lock_iothread();
> handle_diag_308(env, r1, r3);
> + qemu_mutex_unlock_iothread();
> r = 0;
> break;
> case 0x288:
>
Reviewed-by: Thomas Huth <address@hidden>
Re: [Qemu-devel] [PATCH v1 for-2.11 0/3] s390x: fixes for SIGP and DIAG 308, Cornelia Huck, 2017/11/16