From 6ca62eb5982c956b990bf2fa88a82f67bd83da79 Mon Sep 17 00:00:00 2001 From: David Hildenbrand Date: Mon, 29 Jan 2018 13:56:12 +0100 Subject: [PATCH] s390x/tcg: tolerate wrong wakeups due to floating interrupts This is a preparation for floating interrupt support and only applies to MTTCG, single threaded TCG works just fine. If a floating interrupt wakes up a VCPU and the CPU thinks it can run (clearing cs->halted), at the point where the interrupt would be delivered, already another VCPU might have picked up the interrupt, resulting in a wakeup without an interrupt (executing wrong code). It is wrong to let the VCPU continue to execute (the WAIT PSW). Instead, we have to put the VCPU back to sleep. Signed-off-by: David Hildenbrand Message-Id: <20180129125623.21729-8-david@redhat.com> Signed-off-by: Cornelia Huck --- target/s390x/excp_helper.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/target/s390x/excp_helper.c b/target/s390x/excp_helper.c index 0cbc4051d1..23447af942 100644 --- a/target/s390x/excp_helper.c +++ b/target/s390x/excp_helper.c @@ -503,6 +503,11 @@ bool s390_cpu_exec_interrupt(CPUState *cs, int interrupt_request) s390_cpu_do_interrupt(cs); return true; } + if (env->psw.mask & PSW_MASK_WAIT) { + /* Woken up because of a floating interrupt but it has already + * been delivered. Go back to sleep. */ + cpu_interrupt(CPU(cpu), CPU_INTERRUPT_HALT); + } } return false; } -- 2.11.4.GIT