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KVM: keep track of running ioctls

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Using the new accel-blocker API, mark where ioctls are being called
in KVM. Next, we will implement the critical section that will take
care of performing memslots modifications atomically, therefore
preventing any new ioctl from running and allowing the running ones
to finish.

Signed-off-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Message-Id: <20221111154758.1372674-3-eesposit@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Emanuele Giuseppe Esposito 2022-11-11 10:47:57 -05:00 • committed by Paolo Bonzini
parent bd688fc931
commit a27dd2de68
1 changed files with 7 additions and 0 deletions
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7
accel/kvm/kvm-all.c
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@ -2310,6 +2310,7 @@ static int kvm_init(MachineState *ms)
assert(TARGET_PAGE_SIZE <= qemu_real_host_page_size()); assert(TARGET_PAGE_SIZE <= qemu_real_host_page_size());
s->sigmask_len = 8; s->sigmask_len = 8;
accel_blocker_init();
#ifdef KVM_CAP_SET_GUEST_DEBUG #ifdef KVM_CAP_SET_GUEST_DEBUG
QTAILQ_INIT(&s->kvm_sw_breakpoints); QTAILQ_INIT(&s->kvm_sw_breakpoints);
@ -3014,7 +3015,9 @@ int kvm_vm_ioctl(KVMState *s, int type, ...)
va_end(ap); va_end(ap);
trace_kvm_vm_ioctl(type, arg); trace_kvm_vm_ioctl(type, arg);
accel_ioctl_begin();
ret = ioctl(s->vmfd, type, arg); ret = ioctl(s->vmfd, type, arg);
accel_ioctl_end();
if (ret == -1) { if (ret == -1) {
ret = -errno; ret = -errno;
} }
@ -3032,7 +3035,9 @@ int kvm_vcpu_ioctl(CPUState *cpu, int type, ...)
va_end(ap); va_end(ap);
trace_kvm_vcpu_ioctl(cpu->cpu_index, type, arg); trace_kvm_vcpu_ioctl(cpu->cpu_index, type, arg);
accel_cpu_ioctl_begin(cpu);
ret = ioctl(cpu->kvm_fd, type, arg); ret = ioctl(cpu->kvm_fd, type, arg);
accel_cpu_ioctl_end(cpu);
if (ret == -1) { if (ret == -1) {
ret = -errno; ret = -errno;
} }
@ -3050,7 +3055,9 @@ int kvm_device_ioctl(int fd, int type, ...)
va_end(ap); va_end(ap);
trace_kvm_device_ioctl(fd, type, arg); trace_kvm_device_ioctl(fd, type, arg);
accel_ioctl_begin();
ret = ioctl(fd, type, arg); ret = ioctl(fd, type, arg);
accel_ioctl_end();
if (ret == -1) { if (ret == -1) {
ret = -errno; ret = -errno;
} }