From 474ecfa2ca12dee5c07c974a166c27652b9c9a93 Mon Sep 17 00:00:00 2001
From: Alex Williamson <alex.williamson@redhat.com>
Date: Fri, 29 Sep 2017 21:45:50 +0200
Subject: [PATCH 13/27] vfio: Wrap VFIO_DEVICE_GET_REGION_INFO

RH-Author: Alex Williamson <alex.williamson@redhat.com>
Message-id: <20170929214550.16765.34651.stgit@gimli.home>
Patchwork-id: 76771
O-Subject: [RHEL-7.5 qemu-kvm PATCH 13/16] vfio: Wrap VFIO_DEVICE_GET_REGION_INFO
Bugzilla: 1494181
RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
RH-Acked-by: Auger Eric <eric.auger@redhat.com>
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>

Upstream: 469002263a295ec471c1498c3b456ccd9f85a841

In preparation for supporting capability chains on regions, wrap
ioctl(VFIO_DEVICE_GET_REGION_INFO) so we don't duplicate the code for
each caller.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
 hw/misc/vfio.c | 95 +++++++++++++++++++++++++++++++++++-----------------------
 1 file changed, 58 insertions(+), 37 deletions(-)

diff --git a/hw/misc/vfio.c b/hw/misc/vfio.c
index e2dc3f5..57a0065 100644
--- a/hw/misc/vfio.c
+++ b/hw/misc/vfio.c
@@ -292,6 +292,8 @@ static uint32_t vfio_pci_read_config(PCIDevice *pdev, uint32_t addr, int len);
 static void vfio_pci_write_config(PCIDevice *pdev, uint32_t addr,
                                   uint32_t val, int len);
 static void vfio_mmap_set_enabled(VFIOPCIDevice *vdev, bool enabled);
+static int vfio_get_region_info(VFIODevice *vbasedev, int index,
+                                struct vfio_region_info **info);
 
 /*
  * Common VFIO interrupt disable
@@ -1176,26 +1178,26 @@ static const MemoryRegionOps vfio_region_ops = {
 
 static void vfio_pci_load_rom(VFIOPCIDevice *vdev)
 {
-    struct vfio_region_info reg_info = {
-        .argsz = sizeof(reg_info),
-        .index = VFIO_PCI_ROM_REGION_INDEX
-    };
+    struct vfio_region_info *reg_info;
     uint64_t size;
     off_t off = 0;
     size_t bytes;
 
-    if (ioctl(vdev->vbasedev.fd, VFIO_DEVICE_GET_REGION_INFO, &reg_info)) {
+    if (vfio_get_region_info(&vdev->vbasedev,
+                             VFIO_PCI_ROM_REGION_INDEX, &reg_info)) {
         error_report("vfio: Error getting ROM info: %m");
         return;
     }
 
     DPRINTF("Device %s ROM:\n", vdev->vbasedev.name);
     DPRINTF("  size: 0x%lx, offset: 0x%lx, flags: 0x%lx\n",
-            (unsigned long)reg_info.size, (unsigned long)reg_info.offset,
-            (unsigned long)reg_info.flags);
+            (unsigned long)reg_info->size, (unsigned long)reg_info->offset,
+            (unsigned long)reg_info->flags);
+
+    vdev->rom_size = size = reg_info->size;
+    vdev->rom_offset = reg_info->offset;
 
-    vdev->rom_size = size = reg_info.size;
-    vdev->rom_offset = reg_info.offset;
+    g_free(reg_info);
 
     if (!vdev->rom_size) {
         vdev->rom_read_failed = true;
@@ -3483,7 +3485,7 @@ static int vfio_get_device(VFIOGroup *group, const char *name,
                            VFIOPCIDevice *vdev)
 {
     struct vfio_device_info dev_info = { .argsz = sizeof(dev_info) };
-    struct vfio_region_info reg_info = { .argsz = sizeof(reg_info) };
+    struct vfio_region_info *reg_info;
     struct vfio_irq_info irq_info = { .argsz = sizeof(irq_info) };
     int ret, i;
 
@@ -3529,9 +3531,7 @@ static int vfio_get_device(VFIOGroup *group, const char *name,
     }
 
     for (i = VFIO_PCI_BAR0_REGION_INDEX; i < VFIO_PCI_ROM_REGION_INDEX; i++) {
-        reg_info.index = i;
-
-        ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_GET_REGION_INFO, &reg_info);
+        ret = vfio_get_region_info(&vdev->vbasedev, i, &reg_info);
         if (ret) {
             error_report("vfio: Error getting region %d info: %m", i);
             goto error;
@@ -3539,20 +3539,21 @@ static int vfio_get_device(VFIOGroup *group, const char *name,
 
         DPRINTF("Device %s region %d:\n", name, i);
         DPRINTF("  size: 0x%lx, offset: 0x%lx, flags: 0x%lx\n",
-                (unsigned long)reg_info.size, (unsigned long)reg_info.offset,
-                (unsigned long)reg_info.flags);
+                (unsigned long)reg_info->size, (unsigned long)reg_info->offset,
+                (unsigned long)reg_info->flags);
 
         vdev->bars[i].region.vbasedev = &vdev->vbasedev;
-        vdev->bars[i].region.flags = reg_info.flags;
-        vdev->bars[i].region.size = reg_info.size;
-        vdev->bars[i].region.fd_offset = reg_info.offset;
+        vdev->bars[i].region.flags = reg_info->flags;
+        vdev->bars[i].region.size = reg_info->size;
+        vdev->bars[i].region.fd_offset = reg_info->offset;
         vdev->bars[i].region.nr = i;
         QLIST_INIT(&vdev->bars[i].quirks);
-    }
 
-    reg_info.index = VFIO_PCI_CONFIG_REGION_INDEX;
+        g_free(reg_info);
+    }
 
-    ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_GET_REGION_INFO, &reg_info);
+    ret = vfio_get_region_info(&vdev->vbasedev,
+                               VFIO_PCI_CONFIG_REGION_INDEX, &reg_info);
     if (ret) {
         error_report("vfio: Error getting config info: %m");
         goto error;
@@ -3560,41 +3561,43 @@ static int vfio_get_device(VFIOGroup *group, const char *name,
 
     DPRINTF("Device %s config:\n", name);
     DPRINTF("  size: 0x%lx, offset: 0x%lx, flags: 0x%lx\n",
-            (unsigned long)reg_info.size, (unsigned long)reg_info.offset,
-            (unsigned long)reg_info.flags);
+            (unsigned long)reg_info->size, (unsigned long)reg_info->offset,
+            (unsigned long)reg_info->flags);
 
-    vdev->config_size = reg_info.size;
+    vdev->config_size = reg_info->size;
     if (vdev->config_size == PCI_CONFIG_SPACE_SIZE) {
         vdev->pdev.cap_present &= ~QEMU_PCI_CAP_EXPRESS;
     }
-    vdev->config_offset = reg_info.offset;
+    vdev->config_offset = reg_info->offset;
+
+    g_free(reg_info);
 
     if ((vdev->features & VFIO_FEATURE_ENABLE_VGA) &&
         dev_info.num_regions > VFIO_PCI_VGA_REGION_INDEX) {
-        struct vfio_region_info vga_info = {
-            .argsz = sizeof(vga_info),
-            .index = VFIO_PCI_VGA_REGION_INDEX,
-         };
-
-        ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_GET_REGION_INFO, &vga_info);
+        ret = vfio_get_region_info(&vdev->vbasedev,
+                                   VFIO_PCI_VGA_REGION_INDEX, &reg_info);
         if (ret) {
             error_report(
                 "vfio: Device does not support requested feature x-vga");
             goto error;
         }
 
-        if (!(vga_info.flags & VFIO_REGION_INFO_FLAG_READ) ||
-            !(vga_info.flags & VFIO_REGION_INFO_FLAG_WRITE) ||
-            vga_info.size < 0xbffff + 1) {
+        if (!(reg_info->flags & VFIO_REGION_INFO_FLAG_READ) ||
+            !(reg_info->flags & VFIO_REGION_INFO_FLAG_WRITE) ||
+            reg_info->size < 0xbffff + 1) {
             error_report("vfio: Unexpected VGA info, flags 0x%lx, size 0x%lx",
-                         (unsigned long)vga_info.flags,
-                         (unsigned long)vga_info.size);
+                         (unsigned long)reg_info->flags,
+                         (unsigned long)reg_info->size);
+            g_free(reg_info);
+            ret = -1;
             goto error;
         }
 
-        vdev->vga.fd_offset = vga_info.offset;
+        vdev->vga.fd_offset = reg_info->offset;
         vdev->vga.fd = vdev->vbasedev.fd;
 
+        g_free(reg_info);
+
         vdev->vga.region[QEMU_PCI_VGA_MEM].offset = QEMU_PCI_VGA_MEM_BASE;
         vdev->vga.region[QEMU_PCI_VGA_MEM].nr = QEMU_PCI_VGA_MEM;
         QLIST_INIT(&vdev->vga.region[QEMU_PCI_VGA_MEM].quirks);
@@ -3647,6 +3650,24 @@ static void vfio_put_device(VFIOPCIDevice *vdev)
     }
 }
 
+static int vfio_get_region_info(VFIODevice *vbasedev, int index,
+                                struct vfio_region_info **info)
+{
+    size_t argsz = sizeof(struct vfio_region_info);
+
+    *info = g_malloc0(argsz);
+
+    (*info)->index = index;
+    (*info)->argsz = argsz;
+
+    if (ioctl(vbasedev->fd, VFIO_DEVICE_GET_REGION_INFO, *info)) {
+        g_free(*info);
+        return -errno;
+    }
+
+    return 0;
+}
+
 static void vfio_err_notifier_handler(void *opaque)
 {
     VFIOPCIDevice *vdev = opaque;
-- 
1.8.3.1