dm: add option "lapic_pt" to create VM for realtime scenarios

New option "--lapic_pt" added to create VM with local apic passthrough, for
realtime scenarios.
When the option is set, a VM is created with LAPIC_PASSTHROUGH.
The option is not set by default.

Tracked-On: #2351
Signed-off-by: Yan, Like <like.yan@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
Acked-by: Anthony Xu <anthony.xu@intel.com>

Author: lyan3

devicemodel/core/main.c

@@ -171,7 +171,8 @@ usage(int code)
 		"       --intr_monitor: enable interrupt storm monitor\n"
 		"            its params: threshold/s,probe-period(s),delay_time(ms),delay_duration(ms)\n"
 		"       --virtio_poll: enable virtio poll mode with poll interval with ns\n"
-		"       --vtpm2: Virtual TPM2 args: sock_path=$PATH_OF_SWTPM_SOCKET\n",
+		"       --vtpm2: Virtual TPM2 args: sock_path=$PATH_OF_SWTPM_SOCKET\n"
+		"       --lapic_pt: enable local apic passthrough\n",
 		progname, (int)strnlen(progname, PATH_MAX), "", (int)strnlen(progname, PATH_MAX), "",
 		(int)strnlen(progname, PATH_MAX), "", (int)strnlen(progname, PATH_MAX), "",
 		(int)strnlen(progname, PATH_MAX), "", (int)strnlen(progname, PATH_MAX), "");
@@ -706,6 +707,7 @@ enum {
 	CMD_OPT_DUMP,
 	CMD_OPT_INTR_MONITOR,
 	CMD_OPT_VTPM2,
+	CMD_OPT_LAPIC_PT,
 };
 
 static struct option long_options[] = {
@@ -744,6 +746,7 @@ static struct option long_options[] = {
 	{"debugexit",		no_argument,		0, CMD_OPT_DEBUGEXIT},
 	{"intr_monitor",	required_argument,	0, CMD_OPT_INTR_MONITOR},
 	{"vtpm2",		required_argument,	0, CMD_OPT_VTPM2},
+	{"lapic_pt",		no_argument,		0, CMD_OPT_LAPIC_PT},
 	{0,			0,			0,  0  },
 };
 
@@ -887,6 +890,9 @@ dm_run(int argc, char *argv[])
 		case CMD_OPT_DEBUGEXIT:
 			debugexit_enabled = true;
 			break;
+		case CMD_OPT_LAPIC_PT:
+			lapic_pt = true;
+			break;
 		case CMD_OPT_VTPM2:
 			if (acrn_parse_vtpm2(optarg) != 0) {
 				errx(EX_USAGE, "invalid vtpm2 param %s", optarg);

devicemodel/core/vmmapi.c

@@ -138,6 +138,14 @@ vm_create(const char *name, uint64_t req_buf)
 	else
 		create_vm.vm_flag &= (~SECURE_WORLD_ENABLED);
 
+	if (lapic_pt) {
+		create_vm.vm_flag |= LAPIC_PASSTHROUGH;
+		create_vm.vm_flag |= IOREQ_COMPLETION_POLLING;
+	} else {
+		create_vm.vm_flag &= (~LAPIC_PASSTHROUGH);
+		create_vm.vm_flag &= (~IOREQ_COMPLETION_POLLING);
+	}
+
 	create_vm.req_buf = req_buf;
 	while (retry > 0) {
 		error = ioctl(ctx->fd, IC_CREATE_VM, &create_vm);

devicemodel/include/public/acrn_common.h

@@ -66,7 +66,9 @@
 #endif
 
 /* Generic VM flags from guest OS */
-#define SECURE_WORLD_ENABLED    (1UL<<0)  /* Whether secure world is enabled */
+#define SECURE_WORLD_ENABLED		(1UL << 0U)	/* Whether secure world is enabled */
+#define LAPIC_PASSTHROUGH		(1UL << 1U)	/* Whether LAPIC is passed through */
+#define IOREQ_COMPLETION_POLLING	(1UL << 2U)	/* Whether need hypervisor poll IO completion */
 
 /**
  * @brief Hypercall