HV: Set vm state as with VM_POWERING_OFF when RTVM poweroff by itself

We set the vm state as VM_POWERING_OFF when RTVM is trying to poweroff by itself.
We will check it when trying to pause vCPUs of RTVM. Only if vm state equal to
VM_POWERING_OFF, we take action to pause the vCPUs of RTVM. Otherwise, we will
reject the pause request.

Tracked-On: #2865
Signed-off-by: Kaige Fu <kaige.fu@intel.com>

Author: KaigeFu

hypervisor/arch/x86/guest/pm.c

@@ -220,10 +220,16 @@ static bool rt_vm_pm1a_io_read(__unused struct acrn_vm *vm, __unused struct acrn
 	return false;
 }
 
-static bool rt_vm_pm1a_io_write(__unused struct acrn_vm *vm, __unused uint16_t addr,
-							__unused size_t width, __unused uint32_t v)
+static bool rt_vm_pm1a_io_write(struct acrn_vm *vm, uint16_t addr, size_t width, uint32_t v)
 {
-	/* TODO: Check if the vm is trying to powering off itself */
+	if ((addr != RT_VM_PM1A_CNT_ADDR) || (width != 2U)) {
+		pr_dbg("Invalid address (0x%x) or width (0x%x)", addr, width);
+	} else {
+		if (((v & RT_VM_PM1A_SLP_EN) && (((v & RT_VM_PM1A_SLP_TYP) >> 10U) == 5U)) != 0U) {
+			vm->state = VM_POWERING_OFF;
+		}
+	}
+
 	return false;
 }
 

hypervisor/include/arch/x86/guest/vm.h

@@ -88,6 +88,7 @@ enum vm_state {
 	VM_STATE_INVALID = 0,
 	VM_CREATED,	/* VM created / awaiting start (boot) */
 	VM_STARTED,	/* VM started (booted) */
+	VM_POWERING_OFF,     /* RTVM only, it is trying to poweroff by itself */
 	VM_PAUSED,	/* VM paused */
 };
 

hypervisor/include/public/acrn_common.h

@@ -56,6 +56,8 @@
 
 /* TODO: We may need to get this addr from guest ACPI instead of hardcode here */
 #define RT_VM_PM1A_CNT_ADDR	0x404U
+#define RT_VM_PM1A_SLP_TYP	0x1c00U
+#define RT_VM_PM1A_SLP_EN	0x2000U
 
 /**
  * @brief Hypercall