Chun Yan Liu writes (" Re: Re: ç-¤úRe: [Xen-devel][ PATCH]qemu-xen: let xen
fb_guest_copy() handle dept h=32 case"):
> In hw/xenfb.c, xenfb_guest_copy only handles xenfb->depth=8 and 24 cases, I
> guess it assumes in xenfb->depth=16 or 32 cases, buffer is shared. But that's
> not always the case: the code path that allows us to have a shared buffer
> when xenfb->depth=16 or 32 is xenfb->do_resize set, but on a guest vnc
> console, when enter CTRL+ALT+2 switch to qemu monitor console then CTRL+ALT+1
> back to guest window, the xenfb->do_resize is not set, that is, buffer is not
> shared, and xenfb_guest_copy does not handle xenfb->depth=32 case, the result
> is: guest screen cannot be restored.
>
> To fix above problem, this patch does two things:
> 1. Set xenfb->do_resize in xenfb_invalidate so that in console switch case,
> buffer is shared when xenfb->depth=16 or 32. The screen cannot be restored
> bug in above description can be solved.
> 2. To avoid that other special cases have the same problem, it's better to
> let xenfb_guest_copy handle all cases, so add processing to xenfb->depth=16
> and 32 in xenfb_guest_copy.
I have applied this patch, thanks.
Ian.
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