Re: [PATCH v4 6/6] hw/cxl: Add clear poison mailbox command support.

[Jonathan Cameron via <qemu-devel@nongnu.org>]

On Fri, 3 Mar 2023 15:09:08 +0000
Jonathan Cameron <Jonathan.Cameron@huawei.com> wrote:

> Current implementation is very simple so many of the corner
> cases do not exist (e.g. fragmenting larger poison list entries)
> 
> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Another case in here of directly accessing MemoryRegion->size.
I'll fix that up for v5.

...

> diff --git a/hw/mem/cxl_type3.c b/hw/mem/cxl_type3.c
> index 21e3a84785..0d9de0ee03 100644
> --- a/hw/mem/cxl_type3.c
> +++ b/hw/mem/cxl_type3.c
> @@ -919,6 +919,41 @@ static void set_lsa(CXLType3Dev *ct3d, const void *buf, uint64_t size,
>       */
>  }
>  
> +static bool set_cacheline(CXLType3Dev *ct3d, uint64_t dpa_offset, uint8_t *data)
> +{
> +    MemoryRegion *vmr = NULL, *pmr = NULL;
> +    AddressSpace *as;
> +
> +    if (ct3d->hostvmem) {
> +        vmr = host_memory_backend_get_memory(ct3d->hostvmem);
> +    }
> +    if (ct3d->hostpmem) {
> +        pmr = host_memory_backend_get_memory(ct3d->hostpmem);
> +    }
> +
> +    if (!vmr && !pmr) {
> +        return false;
> +    }
> +
> +    if (dpa_offset + 64 > int128_get64(ct3d->cxl_dstate.mem_size)) {
> +        return false;
> +    }
> +
> +    if (vmr) {
> +        if (dpa_offset < int128_get64(vmr->size)) {
> +            as = &ct3d->hostvmem_as;
> +        } else {
> +            as = &ct3d->hostpmem_as;
> +            dpa_offset -= vmr->size;

Michael pointed out we shouldn't do this in the Volatile series.
Fixed the same way here with memory_region_size() here and instead
of the int128_get64 above.


> +        }
> +    } else {
> +        as = &ct3d->hostpmem_as;
> +    }
> +
> +    address_space_write(as, dpa_offset, MEMTXATTRS_UNSPECIFIED, &data, 64);
> +    return true;
> +}
> +