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drm/hyperv : Removing the restruction of VRAM allocation with PCI bar size

Vitaly Kuznetsov requested to merge vkuznets/centos-stream-9:bug2030922_v0 into main

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2030922

Hyper-V DRM driver uses MMIO address from PCI bar directly but in some cases the memory is already used by some other device. Switch to always using vmbus_allocate_mmio() which has the required protection.

Signed-off-by: Vitaly Kuznetsov vkuznets@redhat.com

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