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accel/mshv: Add vCPU signal handling

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Implement signal handling for MSHV vCPUs to support asynchronous
interrupts from the main thread.

Signed-off-by: Magnus Kulke <magnuskulke@linux.microsoft.com>
Link: https://lore.kernel.org/r/20250916164847.77883-12-magnuskulke@linux.microsoft.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Magnus Kulke 2025-09-16 18:48:31 +02:00 • committed by Paolo Bonzini
parent 4dc5d42572
commit 575df4df54
1 changed files with 30 additions and 0 deletions
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30
accel/mshv/mshv-all.c
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@ -524,6 +524,35 @@ static int mshv_cpu_exec(CPUState *cpu)
return ret;
}
/*
* The signal handler is triggered when QEMU's main thread receives a SIG_IPI
* (SIGUSR1). This signal causes the current CPU thread to be kicked, forcing a
* VM exit on the CPU. The VM exit generates an exit reason that breaks the loop
* (see mshv_cpu_exec). If the exit is due to a Ctrl+A+x command, the system
* will shut down. For other cases, the system will continue running.
*/
static void sa_ipi_handler(int sig)
{
/* TODO: call IOCTL to set_immediate_exit, once implemented. */
qemu_cpu_kick_self();
}
static void init_signal(CPUState *cpu)
{
/* init cpu signals */
struct sigaction sigact;
sigset_t set;
memset(&sigact, 0, sizeof(sigact));
sigact.sa_handler = sa_ipi_handler;
sigaction(SIG_IPI, &sigact, NULL);
pthread_sigmask(SIG_BLOCK, NULL, &set);
sigdelset(&set, SIG_IPI);
pthread_sigmask(SIG_SETMASK, &set, NULL);
}
static void *mshv_vcpu_thread(void *arg)
{
CPUState *cpu = arg;
@ -540,6 +569,7 @@ static void *mshv_vcpu_thread(void *arg)
error_report("Failed to init vcpu %d", cpu->cpu_index);
goto cleanup;
}
init_signal(cpu);
/* signal CPU creation */
cpu_thread_signal_created(cpu);