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i386/hvf: In kick_vcpu use hv_vcpu_interrupt to force exit 

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. Alternatively, if the vCPU thread
is not
running the VM, it will immediately cause an exit when it attempts
to do so.

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 before switching to that.

Signed-off-by: Phil Dennis-Jordan <phil@philjordan.eu>
Message-ID: <20240605112556.43193-6-phil@philjordan.eu>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Phil Dennis-Jordan 2024-06-05 13:25:54 +02:00 committed by Paolo Bonzini
parent 3e2c6727cb
commit bf9bf2306c
1 changed files with 1 additions and 0 deletions
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target/i386/hvf/hvf.c
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@ -215,6 +215,7 @@ static inline bool apic_bus_freq_is_known(CPUX86State *env)
void hvf_kick_vcpu_thread(CPUState *cpu)
{
cpus_kick_thread(cpu);
hv_vcpu_interrupt(&cpu->accel->fd, 1);
}
int hvf_arch_init(void)