dm: add function to get VM-config information

This patch add function 'vm_get_config()' to get
 configuration information for current VM from hypervisor.

Tracked-On: #5649
Signed-off-by: Yonghua Huang <yonghua.huang@intel.com>
Reviewed-by: Fei Li <fei1.li@intel.com>
Acked-by: Yu Wang <yu1.wang@intel.com>

devicemodel/core/vmmapi.c

@@ -704,3 +704,48 @@ vm_irqfd(struct vmctx *ctx, struct acrn_irqfd *args)
 {
 	return ioctl(ctx->fd, IC_EVENT_IRQFD, args);
 }
+
+int
+vm_get_config(struct vmctx *ctx, struct acrn_vm_config *vm_cfg)
+{
+#define VM_CFG_BUFF_SIZE 0x4000
+	int i, err = 0;
+	uint8_t *configs_buff;
+	struct acrn_vm_config *pcfg;
+	struct platform_info platform_info;
+
+	if ((ctx == NULL) || (vm_cfg == NULL))
+		return -1;
+
+	configs_buff = calloc(1, VM_CFG_BUFF_SIZE);
+	if (configs_buff == NULL) {
+		pr_err("%s, Allocate memory fail.\n", __func__);
+		return -1;
+	}
+
+	bzero(&platform_info, sizeof(platform_info));
+	platform_info.vm_configs_addr = (uint64_t)configs_buff;
+	err = ioctl(ctx->fd, IC_GET_PLATFORM_INFO, &platform_info);
+	if (err) {
+		pr_err("%s, failed: get platform info.\n", __func__);
+		goto exit;
+	}
+
+	for (i = 0; i < platform_info.max_vms; i++) {
+		pcfg = (struct acrn_vm_config *)(configs_buff + (i * platform_info.vm_config_entry_size));
+		if (!uuid_compare(ctx->vm_uuid, pcfg->uuid))
+			break;
+	}
+
+	if (i == platform_info.max_vms) {
+		pr_err("%s, Not found target VM.\n", __func__);
+		err = -1;
+		goto exit;
+	}
+
+	memcpy((void *)vm_cfg, (void *)pcfg, sizeof(struct acrn_vm_config));
+
+exit:
+	free(configs_buff);
+	return err;
+}

devicemodel/include/public/vhm_ioctl_defs.h

@@ -292,6 +292,29 @@ struct api_version {
 	uint32_t minor_version;
 };
 
+enum acrn_vm_load_order {
+	PRE_LAUNCHED_VM = 0,
+	SOS_VM,
+	POST_LAUNCHED_VM,
+	MAX_LOAD_ORDER
+};
+
+#define MAX_VM_OS_NAME_LEN      32U
+
+struct acrn_vm_config {
+	enum acrn_vm_load_order load_order;
+	char name[MAX_VM_OS_NAME_LEN];
+	const uint8_t uuid[16];
+	uint8_t reserved[2];
+	uint8_t severity;
+	uint64_t cpu_affinity;
+	uint64_t guest_flags;
+	/*
+	 * The following are hv-specific members and are thus opaque.
+	 * vm_config_entry_size determines the real size of this structure.
+	 */
+} __aligned(8);
+
 /**
  * @brief data structure to track VHM platform information
  */
@@ -300,15 +323,43 @@ struct platform_info {
 	/** Physical CPU number */
 	uint16_t cpu_num;
 
+	/** version of this structure */
+	uint16_t version;
+
 	/** Align the size of version & hardware info to 128Bytes. */
-	uint8_t reserved0[126];
+	uint8_t reserved0[124];
 
 	/** Configuration Information */
 	/** Maximum vCPU number for one VM. */
 	uint16_t max_vcpus_per_vm;
 
+	/** Maximum Kata container number in SOS VM */
+	uint8_t max_kata_containers;
+
+	uint8_t reserved1[7];
+
+	/** Number of configured VMs */
+	uint16_t max_vms;
+
+	/**
+	 * The size of acrn_vm_config is various on different platforms.
+	 * This is the size of this struct which is used by the caller
+	 * to parse the vm_configs array.
+	 */
+	uint32_t vm_config_entry_size;
+
+	/**
+	 * Address to an array of struct acrn_vm_config, containing all
+	 * the configurations of all VMs. VHM treats it as an opague data
+	 * structure.
+	 *
+	 * The size of one array element is vm_config_entry_size while
+	 * the number of elements is max_vms.
+	 */
+	uint64_t vm_configs_addr;
+
 	/** Align the size of Configuration info to 128Bytes. */
-	uint8_t reserved1[126];
+	uint8_t reserved2[104];
 } __aligned(8);
 
 struct acrn_ioeventfd {

devicemodel/include/vmmapi.h

@@ -150,4 +150,5 @@ void	vm_reset_watchdog(struct vmctx *ctx);
 
 int	vm_ioeventfd(struct vmctx *ctx, struct acrn_ioeventfd *args);
 int	vm_irqfd(struct vmctx *ctx, struct acrn_irqfd *args);
+int	vm_get_config(struct vmctx *ctx, struct acrn_vm_config *vm_cfg);
 #endif	/* _VMMAPI_H_ */