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References: <20170330164657.50c75e8c@nial.brq.redhat.com>
From: Alex =?utf-8?Q?Benn=C3=A9e?= <alex.bennee@linaro.org>
In-reply-to: <20170330164657.50c75e8c@nial.brq.redhat.com>
Date: Thu, 30 Mar 2017 16:05:58 +0100
Message-ID: <87k2764xex.fsf@linaro.org>
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Subject: Re: [Qemu-devel] qemu-2.9 crashes in tcg_handle_interrupt() during
 winx64 boot
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To: Igor Mammedov <imammedo@redhat.com>
Cc: qemu-devel@nongnu.org, Jan Kiszka <jan.kiszka@siemens.com>, KONRAD Frederic <fred.konrad@greensocs.com>, "Emilio G. Cota" <cota@braap.org>, Richard Henderson <rth@twiddle.net>, Pranith Kumar <bobby.prani@gmail.com>, Peter Maydell <peter.maydell@linaro.org>, Paolo Bonzini <pbonzini@redhat.com>


Igor Mammedov <imammedo@redhat.com> writes:

> (PS: resend due to wrong qemu-devel mail list address in original
> email)

Le *sigh* another way of x86 generating IRQs ;-)

Could you test this please?

target/i386/misc_helper: wrap BQL around another IRQ generator

Anything that calls into HW emulation must be protected by the BQL.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

1 file changed, 2 insertions(+)
target/i386/misc_helper.c | 2 ++

modified   target/i386/misc_helper.c
@@ -156,7 +156,9 @@ void helper_write_crN(CPUX86State *env, int reg, target_ulong t0)
         break;
     case 8:
         if (!(env->hflags2 & HF2_VINTR_MASK)) {
+            qemu_mutex_lock_iothread();
             cpu_set_apic_tpr(x86_env_get_cpu(env)->apic_state, t0);
+            qemu_mutex_unlock_iothread();
         }
         env->v_tpr = t0 & 0x0f;
         break;
--
Alex Bennée