The hardcoded memory map we expose to a guest is currently described using a series of partially interconnected preprocessor constants, which is hard to read and follow. In preparation for moving the UART and RTC to some different MMIO region, document the current map with some ASCII art, and clean up the definition of the sections. This changes the only internally used value of ARM_MMIO_AREA, to better align with its actual meaning and future extensions. No functional change. Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx> --- arm/include/arm-common/kvm-arch.h | 41 ++++++++++++++++++++++--------- 1 file changed, 29 insertions(+), 12 deletions(-) diff --git a/arm/include/arm-common/kvm-arch.h b/arm/include/arm-common/kvm-arch.h index d84e50cd..a2e32953 100644 --- a/arm/include/arm-common/kvm-arch.h +++ b/arm/include/arm-common/kvm-arch.h @@ -7,14 +7,33 @@ #include "arm-common/gic.h" +/* + * The memory map used for ARM guests (not to scale): + * + * 0 64K 16M 32M 48M 1GB 2GB + * +-------+----+-------+-------+--------+-----+---------+---...... + * | PCI |////| plat | | | | | + * | I/O |////| MMIO | Flash | virtio | GIC | PCI | DRAM + * | space |////| | | MMIO | | (AXI) | + * | |////| | | | | | + * +-------+----+-------+-------+--------+-----+---------+---...... + */ + #define ARM_IOPORT_AREA _AC(0x0000000000000000, UL) -#define ARM_FLASH_AREA _AC(0x0000000002000000, UL) -#define ARM_MMIO_AREA _AC(0x0000000003000000, UL) +#define ARM_MMIO_AREA _AC(0x0000000001000000, UL) #define ARM_AXI_AREA _AC(0x0000000040000000, UL) #define ARM_MEMORY_AREA _AC(0x0000000080000000, UL) -#define ARM_LOMAP_MAX_MEMORY ((1ULL << 32) - ARM_MEMORY_AREA) -#define ARM_HIMAP_MAX_MEMORY ((1ULL << 40) - ARM_MEMORY_AREA) +#define KVM_IOPORT_AREA ARM_IOPORT_AREA +#define ARM_IOPORT_SIZE (1U << 16) + + +#define KVM_FLASH_MMIO_BASE (ARM_MMIO_AREA + 0x1000000) +#define KVM_FLASH_MAX_SIZE 0x1000000 + +#define KVM_VIRTIO_MMIO_AREA (KVM_FLASH_MMIO_BASE + KVM_FLASH_MAX_SIZE) +#define ARM_VIRTIO_MMIO_SIZE (ARM_AXI_AREA - \ + (KVM_VIRTIO_MMIO_AREA + ARM_GIC_SIZE)) #define ARM_GIC_DIST_BASE (ARM_AXI_AREA - ARM_GIC_DIST_SIZE) #define ARM_GIC_CPUI_BASE (ARM_GIC_DIST_BASE - ARM_GIC_CPUI_SIZE) @@ -22,19 +41,17 @@ #define ARM_GIC_DIST_SIZE 0x10000 #define ARM_GIC_CPUI_SIZE 0x20000 -#define KVM_FLASH_MMIO_BASE ARM_FLASH_AREA -#define KVM_FLASH_MAX_SIZE (ARM_MMIO_AREA - ARM_FLASH_AREA) -#define ARM_IOPORT_SIZE (1U << 16) -#define ARM_VIRTIO_MMIO_SIZE (ARM_AXI_AREA - (ARM_MMIO_AREA + ARM_GIC_SIZE)) +#define KVM_PCI_CFG_AREA ARM_AXI_AREA #define ARM_PCI_CFG_SIZE (1ULL << 24) +#define KVM_PCI_MMIO_AREA (KVM_PCI_CFG_AREA + ARM_PCI_CFG_SIZE) #define ARM_PCI_MMIO_SIZE (ARM_MEMORY_AREA - \ (ARM_AXI_AREA + ARM_PCI_CFG_SIZE)) -#define KVM_IOPORT_AREA ARM_IOPORT_AREA -#define KVM_PCI_CFG_AREA ARM_AXI_AREA -#define KVM_PCI_MMIO_AREA (KVM_PCI_CFG_AREA + ARM_PCI_CFG_SIZE) -#define KVM_VIRTIO_MMIO_AREA ARM_MMIO_AREA + +#define ARM_LOMAP_MAX_MEMORY ((1ULL << 32) - ARM_MEMORY_AREA) +#define ARM_HIMAP_MAX_MEMORY ((1ULL << 40) - ARM_MEMORY_AREA) + #define KVM_IOEVENTFD_HAS_PIO 0 -- 2.17.5
