[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] QEMU tries to register to VFIO memory that is not RAM
|
From: |
Alex Williamson |
|
Subject: |
Re: [Qemu-devel] QEMU tries to register to VFIO memory that is not RAM |
|
Date: |
Fri, 31 May 2019 08:37:32 -0600 |
On Fri, 31 May 2019 13:32:29 +0000
Thanos Makatos <address@hidden> wrote:
> When configuring device pass-through via VFIO to a VM, I noticed that
> QEMU tries to register (DMA_MAP) all memory regions of a guest (not
> only RAM). That includes firmware regions like "pc.rom". Would a
> physical device ever need access to those?
Probably not, but are those things not in the address space of the
device on a physical system?
> Am I missing something?
Does this cause a problem? It's not always easy to identify regions
that should not be mapped to a device, clearly we're not going to
create a whitelist based on the name of the region. Thanks,
Alex