Re: [PATCH v6 06/10] i386/pc: factor out cxl range start to helper

[Igor Mammedov]

On Fri,  1 Jul 2022 17:10:10 +0100
Joao Martins <joao.m.martins@oracle.com> wrote:

> Factor out the calculation of the base address of the MR. It will be
> used later on for the cxl range end counterpart calculation and as
> well in pc_memory_init() CXL mr initialization, thus avoiding
> duplication.
> 
> Cc: Jonathan Cameron <jonathan.cameron@huawei.com>
> Signed-off-by: Joao Martins <joao.m.martins@oracle.com>

needs to be rebased on top of 


[PATCH 2/3] hw/i386/pc: Always place CXL Memory Regions after device_memory

> ---
>  hw/i386/pc.c | 28 +++++++++++++++++++---------
>  1 file changed, 19 insertions(+), 9 deletions(-)
> 
> diff --git a/hw/i386/pc.c b/hw/i386/pc.c
> index 0abbf81841a9..8655cc3b8894 100644
> --- a/hw/i386/pc.c
> +++ b/hw/i386/pc.c
> @@ -825,6 +825,24 @@ 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;
> +        if (!pcmc->broken_reserved_end) {
> +            cxl_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;
> @@ -946,15 +964,7 @@ 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;
> -            if (!pcmc->broken_reserved_end) {
> -                cxl_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);