[PATCH 2/3] i386: hvf: In kick_vcpu use hv_vcpu_interrupt to force exit

[Phil Dennis-Jordan]

When interrupting a vCPU thread, this patch actually tells the hypervisor to
stop running guest code on that vCPU.

Calling hv_vcpu_interrupt actually forces a vCPU exit, analogously to
hv_vcpus_exit on aarch64.

Previously, hvf_kick_vcpu_thread relied upon hv_vcpu_run returning very
frequently, including many spurious exits, which made it less of a problem that
nothing was actively done to stop the vCPU thread running guest code.
The newer, more efficient hv_vcpu_run_until exits much more rarely, so a true
"kick" is needed.

Signed-off-by: Phil Dennis-Jordan <phil@philjordan.eu>
---
 target/i386/hvf/hvf.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/target/i386/hvf/hvf.c b/target/i386/hvf/hvf.c
index cb2cd0b02f..55bd7d2af8 100644
--- a/target/i386/hvf/hvf.c
+++ b/target/i386/hvf/hvf.c
@@ -209,7 +209,10 @@ static inline bool apic_bus_freq_is_known(CPUX86State *env)
 
 void hvf_kick_vcpu_thread(CPUState *cpu)
 {
+    hv_vcpuid_t hvf_vcpuid;
     cpus_kick_thread(cpu);
+    hvf_vcpuid = cpu->accel->fd;
+    hv_vcpu_interrupt(&hvf_vcpuid, 1);
 }
 
 int hvf_arch_init(void)
-- 
2.36.1