Re: [RFC QEMU PATCH v7] hw/arm/sbsa-ref: Support CXL Host Bridge & CFMW

[Yuquan Wang <wangyuquan1236@phytium.com.cn>]

On Wed, Sep 17, 2025 at 05:39:14PM +0100, Jonathan Cameron wrote:
> On Thu, 7 Aug 2025 19:10:37 +0800
> wangyuquan <wangyuquan1236@phytium.com.cn> wrote:
> 
> > From: Yuquan Wang <wangyuquan1236@phytium.com.cn>
> > 
> > This creates a specific CXL host bridge (0001:00) with four cxl
> > root ports on sbsa-ref. And the memory layout provides separate
> > space windows for the cxl host bridge in the sbsa-ref memmap:
> > 
> > - 64K  CXL Host Bridge Component Registers (CHBCR)
> > - 64K  CXL_PIO
> > - 128M CXL_MMIO
> > - 256M CXL_ECAM
> > - 4G   CXL_MMIO_HIGH
> > 
> > To provide CFMWs on sbsa-ref, this extends 1TB space from the
> > hole above RAM Memory [SBSA_MEM] for CXL Fixed Memory Window:
> > 
> > - 1T   CXL_FIXED_WINDOW
> > 
> > Signed-off-by: Yuquan Wang <wangyuquan1236@phytium.com.cn>
> This looks pretty standard to me so FWIW as someone who hasn't used
> the SBSA model.
> 
> Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
> 
>

Hi, Leif and SBSA folks

We hope to hear from everyone regarding other suggestions for using the
CXL on the sbsa-ref, as well as any areas where this patch might have
been overlooked.

Yuquan