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[Qemu-devel] [PATCH 02/37] Stop current VCPU on synchronous reset reques
From: |
Marcelo Tosatti |
Subject: |
[Qemu-devel] [PATCH 02/37] Stop current VCPU on synchronous reset requests |
Date: |
Mon, 14 Feb 2011 13:22:31 -0200 |
From: Jan Kiszka <address@hidden>
If some I/O operation ends up calling qemu_system_reset_request in VCPU
context, we record this and inform the io-thread, but we do not
terminate the VCPU loop. This can lead to fairly unexpected behavior if
the triggering reset operation is supposed to work synchronously.
Fix this for TCG (when run in deterministic I/O mode) by setting the
VCPU on stop and issuing a cpu_exit. KVM requires some more work on its
VCPU loop.
[ ported from qemu-kvm ]
Signed-off-by: Jan Kiszka <address@hidden>
Signed-off-by: Marcelo Tosatti <address@hidden>
---
cpus.c | 17 +++++++++++++----
cpus.h | 1 +
vl.c | 1 +
3 files changed, 15 insertions(+), 4 deletions(-)
diff --git a/cpus.c b/cpus.c
index ab6e40e..f8a88e3 100644
--- a/cpus.c
+++ b/cpus.c
@@ -312,6 +312,10 @@ void qemu_notify_event(void)
void qemu_mutex_lock_iothread(void) {}
void qemu_mutex_unlock_iothread(void) {}
+void cpu_stop_current(void)
+{
+}
+
void vm_stop(int reason)
{
do_vm_stop(reason);
@@ -852,6 +856,14 @@ static void qemu_system_vmstop_request(int reason)
qemu_notify_event();
}
+void cpu_stop_current(void)
+{
+ if (cpu_single_env) {
+ cpu_single_env->stopped = 1;
+ cpu_exit(cpu_single_env);
+ }
+}
+
void vm_stop(int reason)
{
QemuThread me;
@@ -863,10 +875,7 @@ void vm_stop(int reason)
* FIXME: should not return to device code in case
* vm_stop() has been requested.
*/
- if (cpu_single_env) {
- cpu_exit(cpu_single_env);
- cpu_single_env->stop = 1;
- }
+ cpu_stop_current();
return;
}
do_vm_stop(reason);
diff --git a/cpus.h b/cpus.h
index bf4d9bb..4cadb64 100644
--- a/cpus.h
+++ b/cpus.h
@@ -6,6 +6,7 @@ int qemu_init_main_loop(void);
void qemu_main_loop_start(void);
void resume_all_vcpus(void);
void pause_all_vcpus(void);
+void cpu_stop_current(void);
/* vl.c */
extern int smp_cores;
diff --git a/vl.c b/vl.c
index ed2cdfa..5e3f7f2 100644
--- a/vl.c
+++ b/vl.c
@@ -1296,6 +1296,7 @@ void qemu_system_reset_request(void)
} else {
reset_requested = 1;
}
+ cpu_stop_current();
qemu_notify_event();
}
--
1.7.4
- [Qemu-devel] [PATCH 09/37] kvm: Handle kvm_init_vcpu errors, (continued)
- [Qemu-devel] [PATCH 09/37] kvm: Handle kvm_init_vcpu errors, Marcelo Tosatti, 2011/02/14
- [Qemu-devel] [PATCH 12/37] kvm: Set up signal mask also for !CONFIG_IOTHREAD, Marcelo Tosatti, 2011/02/14
- [Qemu-devel] [PATCH 20/37] kvm: Remove static return code of kvm_handle_io, Marcelo Tosatti, 2011/02/14
- [Qemu-devel] [PATCH 35/37] cirrus: Remove obsolete kvm.h include, Marcelo Tosatti, 2011/02/14
- [Qemu-devel] [PATCH 28/37] Move debug exception handling out of cpu_exec, Marcelo Tosatti, 2011/02/14
- [Qemu-devel] [PATCH 07/37] kvm: Report proper error on GET_VCPU_MMAP_SIZE failures, Marcelo Tosatti, 2011/02/14
- [Qemu-devel] [PATCH 11/37] Refactor signal setup functions in cpus.c, Marcelo Tosatti, 2011/02/14
- [Qemu-devel] [PATCH 23/37] Refactor kvm&tcg function names in cpus.c, Marcelo Tosatti, 2011/02/14
- [Qemu-devel] [PATCH 14/37] kvm: Call qemu_kvm_eat_signals also under !CONFIG_IOTHREAD, Marcelo Tosatti, 2011/02/14
- [Qemu-devel] [PATCH 15/37] Set up signalfd under !CONFIG_IOTHREAD, Marcelo Tosatti, 2011/02/14
- [Qemu-devel] [PATCH 02/37] Stop current VCPU on synchronous reset requests,
Marcelo Tosatti <=
- [Qemu-devel] [PATCH 22/37] kvm: make tsc stable over migration and machine start, Marcelo Tosatti, 2011/02/14
- [Qemu-devel] [PATCH 04/37] Trigger exit from cpu_exec_all on pending IO events, Marcelo Tosatti, 2011/02/14
- [Qemu-devel] [PATCH 34/37] Introduce log_start/log_stop in CPUPhysMemoryClient, Marcelo Tosatti, 2011/02/14
- [Qemu-devel] [PATCH 16/37] kvm: Fix race between timer signals and vcpu entry under !IOTHREAD, Marcelo Tosatti, 2011/02/14
- [Qemu-devel] [PATCH 17/37] kvm: Add MCE signal support for !CONFIG_IOTHREAD, Marcelo Tosatti, 2011/02/14
- [Qemu-devel] [PATCH 37/37] kvm: x86: Introduce kvmclock device to save/restore its state, Marcelo Tosatti, 2011/02/14
- [Qemu-devel] [PATCH 30/37] kvm: x86: Prepare VCPU loop for in-kernel irqchip, Marcelo Tosatti, 2011/02/14
- [Qemu-devel] [PATCH 31/37] kvm: Drop return values from kvm_arch_pre/post_run, Marcelo Tosatti, 2011/02/14
- Re: [Qemu-devel] [PATCH 00/37] [PULL] qemu-kvm.git uq/master queue, Anthony Liguori, 2011/02/14