diff options
Diffstat (limited to 'hw/arm/virt.c')
| -rw-r--r-- | hw/arm/virt.c | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/hw/arm/virt.c b/hw/arm/virt.c index 44bbbea92b..d752c86a51 100644 --- a/hw/arm/virt.c +++ b/hw/arm/virt.c @@ -95,6 +95,23 @@ typedef struct { #define VIRT_MACHINE_CLASS(klass) \ OBJECT_CLASS_CHECK(VirtMachineClass, klass, TYPE_VIRT_MACHINE) +/* RAM limit in GB. Since VIRT_MEM starts at the 1GB mark, this means + * RAM can go up to the 256GB mark, leaving 256GB of the physical + * address space unallocated and free for future use between 256G and 512G. + * If we need to provide more RAM to VMs in the future then we need to: + * * allocate a second bank of RAM starting at 2TB and working up + * * fix the DT and ACPI table generation code in QEMU to correctly + * report two split lumps of RAM to the guest + * * fix KVM in the host kernel to allow guests with >40 bit address spaces + * (We don't want to fill all the way up to 512GB with RAM because + * we might want it for non-RAM purposes later. Conversely it seems + * reasonable to assume that anybody configuring a VM with a quarter + * of a terabyte of RAM will be doing it on a host with more than a + * terabyte of physical address space. + */ +#define RAMLIMIT_GB 255 +#define RAMLIMIT_BYTES (RAMLIMIT_GB * 1024ULL * 1024 * 1024) + /* Addresses and sizes of our components. * 0..128MB is space for a flash device so we can run bootrom code such as UEFI. * 128MB..256MB is used for miscellaneous device I/O. @@ -130,7 +147,7 @@ static const MemMapEntry a15memmap[] = { [VIRT_PCIE_MMIO] = { 0x10000000, 0x2eff0000 }, [VIRT_PCIE_PIO] = { 0x3eff0000, 0x00010000 }, [VIRT_PCIE_ECAM] = { 0x3f000000, 0x01000000 }, - [VIRT_MEM] = { 0x40000000, 30ULL * 1024 * 1024 * 1024 }, + [VIRT_MEM] = { 0x40000000, RAMLIMIT_BYTES }, /* Second PCIe window, 512GB wide at the 512GB boundary */ [VIRT_PCIE_MMIO_HIGH] = { 0x8000000000ULL, 0x8000000000ULL }, }; @@ -1066,7 +1083,7 @@ static void machvirt_init(MachineState *machine) vbi->smp_cpus = smp_cpus; if (machine->ram_size > vbi->memmap[VIRT_MEM].size) { - error_report("mach-virt: cannot model more than 30GB RAM"); + error_report("mach-virt: cannot model more than %dGB RAM", RAMLIMIT_GB); exit(1); } |