On 2015-02-16 10:20, Anup Patel wrote: > On Mon, Feb 16, 2015 at 2:43 PM, Jan Kiszka <jan.kiszka@xxxxxx> wrote: >> Hi, >> >> next issue related to KVM/QEMU on the TK1: The guest image I'm running >> gives proper framebuffer output when in emulation mode. Once KVM is >> enabled, the screen is - at best - only initially updated. Sometimes I >> see the famous tux images and a bit of the console texts, but usually it >> stays black. Explanations? > > The QEMU accesses Guest Video RAM (or any portion of Guest RAM) as > cacheable user space memory. The Guest Kernel might access Guest Video > RAM as non-cacheable to maintain coherency with video device. If this is > the case then all updates by Guest kernel to Guest Video RAM will not > be visible to QEMU. On x86, we manage such RAM as coalesced MMIO region, sync'ing it periodically or on specific register accesses into the video card model. I suppose there is nothing like this for the pl111 yet, right? Jan
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