diff options
| author | Emanuele Giuseppe Esposito <eesposit@redhat.com> | 2022-11-11 10:47:56 -0500 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2023-01-11 09:59:39 +0100 |
| commit | bd688fc93120fb3e28aa70e3dfdf567ccc1e0bc1 (patch) | |
| tree | d763c7b30c195a31dedf67d708b7d770fd16b5ef /include/hw/core | |
| parent | b585edca34a817fdb751dfe94fbd3cde32ffe60d (diff) | |
accel: introduce accelerator blocker API
This API allows the accelerators to prevent vcpus from issuing
new ioctls while execting a critical section marked with the
accel_ioctl_inhibit_begin/end functions.
Note that all functions submitting ioctls must mark where the
ioctl is being called with accel_{cpu_}ioctl_begin/end().
This API requires the caller to always hold the BQL.
API documentation is in sysemu/accel-blocker.h
Internally, it uses a QemuLockCnt together with a per-CPU QemuLockCnt
(to minimize cache line bouncing) to keep avoid that new ioctls
run when the critical section starts, and a QemuEvent to wait
that all running ioctls finish.
Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20221111154758.1372674-2-eesposit@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'include/hw/core')
| -rw-r--r-- | include/hw/core/cpu.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/hw/core/cpu.h b/include/hw/core/cpu.h index 8830546121..2417597236 100644 --- a/include/hw/core/cpu.h +++ b/include/hw/core/cpu.h @@ -398,6 +398,9 @@ struct CPUState { uint32_t kvm_fetch_index; uint64_t dirty_pages; + /* Use by accel-block: CPU is executing an ioctl() */ + QemuLockCnt in_ioctl_lock; + /* Used for events with 'vcpu' and *without* the 'disabled' properties */ DECLARE_BITMAP(trace_dstate_delayed, CPU_TRACE_DSTATE_MAX_EVENTS); DECLARE_BITMAP(trace_dstate, CPU_TRACE_DSTATE_MAX_EVENTS); |