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i386/pc: factor out cxl range start to helper

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Factor out the calculation of the base address of the memory region.
It will be used later on for the cxl range end counterpart calculation
and as well in pc_memory_init() CXL memory region initialization, thus
avoiding duplication.

Cc: Jonathan Cameron <jonathan.cameron@huawei.com>
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Acked-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <20220719170014.27028-7-joao.m.martins@oracle.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Joao Martins 2022-07-19 18:00:09 +01:00 committed by Michael S. Tsirkin
parent 55668e409b
commit 42bed07127
1 changed files with 17 additions and 7 deletions
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24
hw/i386/pc.c
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@ -825,6 +825,22 @@ static hwaddr pc_above_4g_end(PCMachineState *pcms)
return x86ms->above_4g_mem_start + x86ms->above_4g_mem_size;
}
static uint64_t pc_get_cxl_range_start(PCMachineState *pcms)
{
PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms);
MachineState *machine = MACHINE(pcms);
hwaddr cxl_base;
if (pcmc->has_reserved_memory && machine->device_memory->base) {
cxl_base = machine->device_memory->base
+ memory_region_size(&machine->device_memory->mr);
} else {
cxl_base = pc_above_4g_end(pcms);
}
return cxl_base;
}
static uint64_t pc_get_cxl_range_end(PCMachineState *pcms)
{
uint64_t start = 0;
@ -946,13 +962,7 @@ void pc_memory_init(PCMachineState *pcms,
MemoryRegion *mr = &pcms->cxl_devices_state.host_mr;
hwaddr cxl_size = MiB;
if (pcmc->has_reserved_memory && machine->device_memory->base) {
cxl_base = machine->device_memory->base
+ memory_region_size(&machine->device_memory->mr);
} else {
cxl_base = pc_above_4g_end(pcms);
}
cxl_base = pc_get_cxl_range_start(pcms);
e820_add_entry(cxl_base, cxl_size, E820_RESERVED);
memory_region_init(mr, OBJECT(machine), "cxl_host_reg", cxl_size);
memory_region_add_subregion(system_memory, cxl_base, mr);