[Qemu-devel] [RFC 6/7] hw: arm: virt: register reserved IOVA region

[Eric Auger <eric.auger@linaro.org>]

Registers a 16x64kB reserved iova region. Currently this iova
region is used by the kernel to map host MSI controller frames
(GICv2m, GITS_TRANSLATER).

Signed-off-by: Eric Auger <eric.auger@linaro.org>
---
 hw/arm/virt.c         | 10 ++++++++++
 include/hw/arm/virt.h |  1 +
 2 files changed, 11 insertions(+)

diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index 3839c68..7eaf8be 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -125,6 +125,7 @@ static const MemMapEntry a15memmap[] = {
     [VIRT_GPIO] =               { 0x09030000, 0x00001000 },
     [VIRT_SECURE_UART] =        { 0x09040000, 0x00001000 },
     [VIRT_MMIO] =               { 0x0a000000, 0x00000200 },
+    [VIRT_RESERVED] =           { 0x0be00000, 0x00100000 },
     /* ...repeating for a total of NUM_VIRTIO_TRANSPORTS, each of that size */
     [VIRT_PLATFORM_BUS] =       { 0x0c000000, 0x02000000 },
     [VIRT_PCIE_MMIO] =          { 0x10000000, 0x2eff0000 },
@@ -815,6 +816,8 @@ static void create_pcie(const VirtBoardInfo *vbi, qemu_irq *pic,
     hwaddr size_pio = vbi->memmap[VIRT_PCIE_PIO].size;
     hwaddr base_ecam = vbi->memmap[VIRT_PCIE_ECAM].base;
     hwaddr size_ecam = vbi->memmap[VIRT_PCIE_ECAM].size;
+    hwaddr base_reserved = vbi->memmap[VIRT_RESERVED].base;
+    hwaddr size_reserved = vbi->memmap[VIRT_RESERVED].size;
     hwaddr base = base_mmio;
     int nr_pcie_buses = size_ecam / PCIE_MMCFG_SIZE_MIN;
     int irq = vbi->irqmap[VIRT_PCIE];
@@ -822,6 +825,7 @@ static void create_pcie(const VirtBoardInfo *vbi, qemu_irq *pic,
     MemoryRegion *mmio_reg;
     MemoryRegion *ecam_alias;
     MemoryRegion *ecam_reg;
+    MemoryRegion *reserved_reg;
     DeviceState *dev;
     char *nodename;
     int i;
@@ -838,6 +842,12 @@ static void create_pcie(const VirtBoardInfo *vbi, qemu_irq *pic,
                              ecam_reg, 0, size_ecam);
     memory_region_add_subregion(get_system_memory(), base_ecam, ecam_alias);
 
+    reserved_reg = g_new0(MemoryRegion, 1);
+    memory_region_init_reserved_iova(reserved_reg, OBJECT(dev), "reserved-iova",
+                       size_reserved, &error_fatal);
+    memory_region_add_subregion(get_system_memory(), base_reserved,
+                                reserved_reg);
+
     /* Map the MMIO window into system address space so as to expose
      * the section of PCI MMIO space which starts at the same base address
      * (ie 1:1 mapping for that part of PCI MMIO space visible through
diff --git a/include/hw/arm/virt.h b/include/hw/arm/virt.h
index 1ce7847..194871b 100644
--- a/include/hw/arm/virt.h
+++ b/include/hw/arm/virt.h
@@ -61,6 +61,7 @@ enum {
     VIRT_PCIE_MMIO_HIGH,
     VIRT_GPIO,
     VIRT_SECURE_UART,
+    VIRT_RESERVED,
 };
 
 typedef struct MemMapEntry {
-- 
1.9.1