Re: [Question] [Block] Is there a way to control the read caching of a block device?

[Philippe Mathieu-Daudé]

Cc'ing the qemu-block@ list

On 3/9/24 20:13, DUO Labs wrote:
> I know that the `cache` parameter for `-drive` controls the caching 
> behavior when writing from the guest to the host, but is there a way to 
> control the reading behavior host->guest? Currently, on HEAD, if I open 
> a file on both the guest and host, and write some data to the drive on 
> the (macOS) host, the time until it shows up in the (Linux) guest is 
> inconsistent (more specifically, it seems that the data won't show up in 
> the guest unless I close the file and reopen it --- by contrast, if I 
> write to the drive on the guest, it shows up nearly instantaneously on 
> the host).