Re: [Qemu-devel] [PATCH] kvm: First step to push iothread lock out of inner run loop

[Avi Kivity]

On 06/24/2012 05:58 PM, Jan Kiszka wrote:

>>> Are there really cases where the framebuffer is accessible both via MMIO
>>> and RAM-like mappings at the same time? If so, the current flushing on
>>> vmexit would help either as the direct mappings would not trigger exits.
>>> Or what do you mean?
>> 
>> I meant accesses by the display code to put the framebuffer in front of
>> the user's eyes.  Those just access the memory directly.  We could wrap
>> them with memory_region_get/put_ram_ptr() (as Xen requires anyway) and
>> have those issue the flush.
> 
> That's a non issue, we already have to flush on display updates. See
> e.g. vga_update_display.
> 

Ah, of course.


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