DM: Add option of no check against ptdev reset

With '--ptdev_no_reset', DM doen not abort but warn when assign PCIe
dev without reset capability.

Signed-off-by: Edwin Zhai <edwin.zhai@intel.com>
Acked-by: Kevin Tian <kevin.tian@intel.com>

devicemodel/core/main.c

@@ -162,7 +162,8 @@ usage(int code)
 		"       -i: ioc boot parameters\n"
 		"       --vsbl: vsbl file path\n"
 		"       --part_info: guest partition info file path\n"
-		"	--enable_trusty: enable trusty for guest\n",
+		"	--enable_trusty: enable trusty for guest\n"
+		"	--ptdev_no_reset: disable reset check for ptdev\n",
 		progname, (int)strlen(progname), "", (int)strlen(progname), "",
 		(int)strlen(progname), "");
 
@@ -593,6 +594,7 @@ enum {
 	CMD_OPT_VSBL = 1000,
 	CMD_OPT_PART_INFO,
 	CMD_OPT_TRUSTY_ENABLE,
+	CMD_OPT_PTDEV_NO_RESET,
 };
 
 static struct option long_options[] = {
@@ -629,6 +631,8 @@ static struct option long_options[] = {
 	{"part_info",		required_argument,	0, CMD_OPT_PART_INFO},
 	{"enable_trusty",	no_argument,		0,
 					CMD_OPT_TRUSTY_ENABLE},
+	{"ptdev_no_reset",	no_argument,		0,
+		CMD_OPT_PTDEV_NO_RESET},
 	{0,			0,			0,  0  },
 };
 
@@ -795,6 +799,9 @@ main(int argc, char *argv[])
 		case CMD_OPT_TRUSTY_ENABLE:
 			trusty_enabled = 1;
 			break;
+		case CMD_OPT_PTDEV_NO_RESET:
+			ptdev_no_reset(true);
+			break;
 		case 'h':
 			usage(0);
 		default:

devicemodel/hw/pci/passthrough.c

@@ -91,6 +91,11 @@ static pthread_mutex_t ref_cnt_mtx = PTHREAD_MUTEX_INITIALIZER;
 /* Prefer MSI over INTx for ptdev */
 static bool prefer_msi = true;
 
+/* Not check reset capability before assign ptdev.
+ * Set false by default, that is, always check.
+ */
+static bool no_reset = false;
+
 struct passthru_dev {
 	struct pci_vdev *dev;
 	struct pcibar bar[PCI_BARMAX + 1];
@@ -116,6 +121,11 @@ ptdev_prefer_msi(bool enable)
 	prefer_msi = enable;
 }
 
+void ptdev_no_reset(bool enable)
+{
+	no_reset = enable;
+}
+
 static int
 msi_caplen(int msgctrl)
 {
@@ -846,7 +856,8 @@ cfginit(struct vmctx *ctx, struct passthru_dev *ptdev, int bus,
 			warnx("No reset capability for PCIe %x/%x/%x, "
 					"remove it from ptdev list!!\n",
 					bus, slot, func);
-			return -1;
+			if (!no_reset)
+				return -1;
 		}
 	}
 

devicemodel/include/dm.h

@@ -49,4 +49,5 @@ void *paddr_guest2host(struct vmctx *ctx, uintptr_t addr, size_t len);
 void *dm_gpa2hva(uint64_t gpa, size_t size);
 int  virtio_uses_msix(void);
 void ptdev_prefer_msi(bool enable);
+void ptdev_no_reset(bool enable);
 #endif