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s390x/kvm: run guest triggered resets on the target vcpu thread 

Currently, load_normal_reset() and modified_clear_reset() as triggered
by a guest vcpu will initiate cpu resets on the current vcpu thread for
all cpus. The reset should happen on the individual vcpu thread
instead, so let's use run_on_cpu() for this.

This avoids calls to synchronize_rcu() in the kernel.

Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
master
David Hildenbrand 2014-08-28 13:58:49 +02:00 committed by Christian Borntraeger
parent 8b3030114a
commit 85ca3371f6
2 changed files with 23 additions and 22 deletions
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15
target-s390x/cpu.h
View File

@ -353,6 +353,21 @@ static inline hwaddr decode_basedisp_s(CPUS390XState *env, uint32_t ipb)
/* Base/displacement are at the same locations. */
#define decode_basedisp_rs decode_basedisp_s
/* helper functions for run_on_cpu() */
static inline void s390_do_cpu_reset(void *arg)
{
CPUState *cs = arg;
S390CPUClass *scc = S390_CPU_GET_CLASS(cs);
scc->cpu_reset(cs);
}
static inline void s390_do_cpu_full_reset(void *arg)
{
CPUState *cs = arg;
cpu_reset(cs);
}
void s390x_tod_timer(void *opaque);
void s390x_cpu_timer(void *opaque);

30
target-s390x/misc_helper.c
View File

@ -114,33 +114,16 @@ uint32_t HELPER(servc)(CPUS390XState *env, uint64_t r1, uint64_t r2)
}
#ifndef CONFIG_USER_ONLY
static void cpu_reset_all(void)
{
CPUState *cs;
S390CPUClass *scc;
CPU_FOREACH(cs) {
scc = S390_CPU_GET_CLASS(cs);
scc->cpu_reset(cs);
}
}
static void cpu_full_reset_all(void)
{
CPUState *cpu;
CPU_FOREACH(cpu) {
cpu_reset(cpu);
}
}
static int modified_clear_reset(S390CPU *cpu)
{
S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
CPUState *t;
pause_all_vcpus();
cpu_synchronize_all_states();
cpu_full_reset_all();
CPU_FOREACH(t) {
run_on_cpu(t, s390_do_cpu_full_reset, t);
}
cmma_reset(cpu);
io_subsystem_reset();
scc->load_normal(CPU(cpu));
@ -152,10 +135,13 @@ static int modified_clear_reset(S390CPU *cpu)
static int load_normal_reset(S390CPU *cpu)
{
S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
CPUState *t;
pause_all_vcpus();
cpu_synchronize_all_states();
cpu_reset_all();
CPU_FOREACH(t) {
run_on_cpu(t, s390_do_cpu_reset, t);
}
cmma_reset(cpu);
io_subsystem_reset();
scc->initial_cpu_reset(CPU(cpu));