[virtio-dev] Re: [virtio-comment] Re: [virtio-dev] Re: [PATCH 0/5] virtio: introduce SUSPEND bit and vq state

On 10/12/2023 10:38 PM, Michael S. Tsirkin wrote:
> On Thu, Oct 12, 2023 at 06:49:51PM +0800, Zhu, Lingshan wrote:
>> For PCI based configuration, like MSI, we need to fetch from config space
>> anyway.
>> For others like dirty page, we can store the bitmap in host memory, and use
>> PASID for isolation.
> Ok. So how a about a simple interface along the lines of
> u64 cmd_address
> u8 ready_flags:1
>
> For this kind of stuff?
Yes, something like this, log dirty pages in host memory.
The is the draft, not finished yet.

  84 +\begin{lstlisting}
  85 +struct virtio_pci_dity_page_track {
  86 +        u8 enable;               /* Read-Write */
  87 +        u8 gra_power;            /* Read-Write */
  88 +        u8 reserved[2];
  89 +        le32 {
  90 +            pasid: 20;           /* Read-Write */
  91 +            reserved: 12;
  92 +        };
  93 +        le64 bitmap_addr;        /* Read-Write */
  94 +        le64 bitmap_length;      /* Read-Write */
  95 +};
  96 +\end{lstlisting}


>


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