add cpu_test_interrupt()/cpu_set_interrupt() helpers and use them tree wide

The helpers form load-acquire/store-release pair and ensure
that appropriate barriers are in place in case checks happen
outside of BQL.

Use them to replace open-coded checkers/setters across the code,
to make sure that barriers are not missed.  Helpers also make code a
bit more readable.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Jason J. Herne <jjherne@linux.ibm.com>
Link: https://lore.kernel.org/r/20250821155603.2422553-1-imammedo@redhat.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/include/hw/core/cpu.h b/include/hw/core/cpu.h
index f73b4357c7..b01a0cffd6 100644
--- a/include/hw/core/cpu.h
+++ b/include/hw/core/cpu.h
@@ -944,6 +944,28 @@ CPUState *cpu_by_arch_id(int64_t id);
 void cpu_interrupt(CPUState *cpu, int mask);
 
 /**
+ * cpu_test_interrupt:
+ * @cpu: The CPU to check interrupt(s) on.
+ * @mask: The interrupts to check.
+ *
+ * Checks if any of interrupts in @mask are pending on @cpu.
+ */
+static inline bool cpu_test_interrupt(CPUState *cpu, int mask)
+{
+    return qatomic_load_acquire(&cpu->interrupt_request) & mask;
+}
+
+/**
+ * cpu_set_interrupt:
+ * @cpu: The CPU to set pending interrupt(s) on.
+ * @mask: The interrupts to set.
+ *
+ * Sets interrupts in @mask as pending on @cpu.  Unlike @cpu_interrupt,
+ * this does not kick the vCPU.
+ */
+void cpu_set_interrupt(CPUState *cpu, int mask);
+
+/**
  * cpu_set_pc:
  * @cpu: The CPU to set the program counter for.
  * @addr: Program counter value.