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From 76a996b5b9cc079655bde96db67b785db2094b98 Mon Sep 17 00:00:00 2001
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From: David Hildenbrand <david@redhat.com>
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Date: Fri, 21 Dec 2018 15:39:54 +0100
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Subject: [PATCH 10/14] s390x/tcg: fix locking problem with
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tcg_s390_tod_updated
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RH-Author: David Hildenbrand <david@redhat.com>
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Message-id: <20181221153957.28183-10-david@redhat.com>
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Patchwork-id: 83763
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O-Subject: [RHEL-7.6.z qemu-kvm-ma PATCH 09/12] s390x/tcg: fix locking problem with tcg_s390_tod_updated
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Bugzilla: 1672920
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RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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tcg_s390_tod_updated() is always called with the iothread being locked
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(e.g. from S390TODClass->set() e.g. via HELPER(sck) or on incoming
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migration). The helper we call takes the lock itself - bad.
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Let's change that by factoring out updating the ckc timer. This now looks
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much nicer than having to call a helper from another function.
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While touching it we also make sure that env->ckc is updated even if the
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new value is -1ULL, for now it would not have been modified in that case.
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Reported-by: Christian Borntraeger <borntraeger@de.ibm.com>
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Signed-off-by: David Hildenbrand <david@redhat.com>
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Message-Id: <20180629170520.13671-1-david@redhat.com>
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Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
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Signed-off-by: Cornelia Huck <cohuck@redhat.com>
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(cherry picked from commit 30c8db0e219a3c1d8b39c19e8b858830cb141738)
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Signed-off-by: David Hildenbrand <david@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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target/s390x/misc_helper.c | 26 ++++++++++++++++----------
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1 file changed, 16 insertions(+), 10 deletions(-)
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diff --git a/target/s390x/misc_helper.c b/target/s390x/misc_helper.c
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index d629b2f..ffb9f6c 100644
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--- a/target/s390x/misc_helper.c
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+++ b/target/s390x/misc_helper.c
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@@ -150,26 +150,23 @@ uint64_t HELPER(stck)(CPUS390XState *env)
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return tod.low;
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}
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-/* Set Clock Comparator */
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-void HELPER(sckc)(CPUS390XState *env, uint64_t time)
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+static void update_ckc_timer(CPUS390XState *env)
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{
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S390TODState *td = s390_get_todstate();
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+ uint64_t time;
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/* stop the timer and remove pending CKC IRQs */
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timer_del(env->tod_timer);
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- qemu_mutex_lock_iothread();
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+ g_assert(qemu_mutex_iothread_locked());
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env->pending_int &= ~INTERRUPT_EXT_CLOCK_COMPARATOR;
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- qemu_mutex_unlock_iothread();
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/* the tod has to exceed the ckc, this can never happen if ckc is all 1's */
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- if (time == -1ULL) {
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+ if (env->ckc == -1ULL) {
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return;
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}
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- env->ckc = time;
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-
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/* difference between origins */
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- time -= td->base.low;
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+ time = env->ckc - td->base.low;
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/* nanoseconds */
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time = tod2time(time);
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@@ -177,12 +174,21 @@ void HELPER(sckc)(CPUS390XState *env, uint64_t time)
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timer_mod(env->tod_timer, time);
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}
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+/* Set Clock Comparator */
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+void HELPER(sckc)(CPUS390XState *env, uint64_t ckc)
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+{
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+ env->ckc = ckc;
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+
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+ qemu_mutex_lock_iothread();
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+ update_ckc_timer(env);
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+ qemu_mutex_unlock_iothread();
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+}
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+
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void tcg_s390_tod_updated(CPUState *cs, run_on_cpu_data opaque)
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{
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S390CPU *cpu = S390_CPU(cs);
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- CPUS390XState *env = &cpu->env;
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- helper_sckc(env, env->ckc);
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+ update_ckc_timer(&cpu->env);
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}
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/* Set Clock */
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--
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1.8.3.1
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