diff options
| author | Jan Kiszka <jan.kiszka@siemens.com> | 2015-06-18 18:47:23 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2015-07-01 15:45:51 +0200 |
| commit | 4b8523ee896750c37b4fa224a40d34703cbdf4c6 (patch) | |
| tree | 1083d1e6c59b33c68808094d4b6844ddf935c9f0 /target-mips | |
| parent | 4840f10eff37eebc609fcc933ab985dc66df95c6 (diff) | |
| download | qemu-4b8523ee896750c37b4fa224a40d34703cbdf4c6.zip | |
kvm: First step to push iothread lock out of inner run loop
This opens the path to get rid of the iothread lock on vmexits in KVM
mode. On x86, the in-kernel irqchips has to be used because we otherwise
need to synchronize APIC and other per-cpu state accesses that could be
changed concurrently.
Regarding pre/post-run callbacks, s390x and ARM should be fine without
specific locking as the callbacks are empty. MIPS and POWER require
locking for the pre-run callback.
For the handle_exit callback, it is non-empty in x86, POWER and s390.
Some POWER cases could do without the locking, but it is left in
place for now.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <1434646046-27150-7-git-send-email-pbonzini@redhat.com>
Diffstat (limited to 'target-mips')
| -rw-r--r-- | target-mips/kvm.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/target-mips/kvm.c b/target-mips/kvm.c index 948619fbab..7d2293d934 100644 --- a/target-mips/kvm.c +++ b/target-mips/kvm.c @@ -99,6 +99,8 @@ void kvm_arch_pre_run(CPUState *cs, struct kvm_run *run) int r; struct kvm_mips_interrupt intr; + qemu_mutex_lock_iothread(); + if ((cs->interrupt_request & CPU_INTERRUPT_HARD) && cpu_mips_io_interrupts_pending(cpu)) { intr.cpu = -1; @@ -109,6 +111,8 @@ void kvm_arch_pre_run(CPUState *cs, struct kvm_run *run) __func__, cs->cpu_index, intr.irq); } } + + qemu_mutex_unlock_iothread(); } MemTxAttrs kvm_arch_post_run(CPUState *cs, struct kvm_run *run) |