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Re: [Qemu-devel] [PULL 14/28] exec: make address spaces 64-bit wide
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PULL 14/28] exec: make address spaces 64-bit wide |
Date: |
Tue, 14 Jan 2014 16:05:30 +0200 |
On Tue, Jan 14, 2014 at 08:50:54AM -0500, Mike Day wrote:
>
> "Michael S. Tsirkin" <address@hidden> writes:
>
> > On Fri, Jan 10, 2014 at 08:31:36AM -0700, Alex Williamson wrote:
>
> > Short term, just assume 48 bits on x86.
> >
> > We need to figure out what's the limitation on ppc and arm -
> > maybe there's none and it can address full 64 bit range.
> >
> > Cc some people who might know about these platforms.
>
> The document you need is here:
>
> http://goo.gl/fJYxdN
>
> "PCI Bus Binding To: IEEE Std 1275-1994"
>
> The short answer is that Power (OpenFirmware-to-PCI) supports both MMIO
> and Memory mappings for BARs.
>
> Also, both 32-bit and 64-bit BARs are required to be supported. It is
> legal to construct a 64-bit BAR by masking all the high bits to
> zero. Presumably it would be OK to mask the 16 high bits to zero as
> well, constructing a 48-bit address.
>
> Mike
>
> --
> Mike Day | "Endurance is a Virtue"
The question was whether addresses such as
0xfffffffffec00000 can be a valid BAR value on these
platforms, whether it's accessible to the CPU and
to other PCI devices.
--
MST
- Re: [Qemu-devel] [PULL 14/28] exec: make address spaces 64-bit wide, (continued)
- Re: [Qemu-devel] [PULL 14/28] exec: make address spaces 64-bit wide, Michael S. Tsirkin, 2014/01/14
- Re: [Qemu-devel] [PULL 14/28] exec: make address spaces 64-bit wide, Michael S. Tsirkin, 2014/01/14
- Re: [Qemu-devel] [PULL 14/28] exec: make address spaces 64-bit wide, Michael S. Tsirkin, 2014/01/14
- Re: [Qemu-devel] [PULL 14/28] exec: make address spaces 64-bit wide, Alex Williamson, 2014/01/14
- Re: [Qemu-devel] [PULL 14/28] exec: make address spaces 64-bit wide, Michael S. Tsirkin, 2014/01/14
- Re: [Qemu-devel] [PULL 14/28] exec: make address spaces 64-bit wide, Mike Day, 2014/01/14
- Re: [Qemu-devel] [PULL 14/28] exec: make address spaces 64-bit wide, Mike Day, 2014/01/14
- Re: [Qemu-devel] [PULL 14/28] exec: make address spaces 64-bit wide, Alex Williamson, 2014/01/14
- Re: [Qemu-devel] [PULL 14/28] exec: make address spaces 64-bit wide, Mike Day, 2014/01/14
- Re: [Qemu-devel] [PULL 14/28] exec: make address spaces 64-bit wide, Mike Day, 2014/01/14
- Re: [Qemu-devel] [PULL 14/28] exec: make address spaces 64-bit wide,
Michael S. Tsirkin <=
- Re: [Qemu-devel] [PULL 14/28] exec: make address spaces 64-bit wide, Mike Day, 2014/01/14
- Re: [Qemu-devel] [PULL 14/28] exec: make address spaces 64-bit wide, Alexey Kardashevskiy, 2014/01/14
Re: [Qemu-devel] [PULL 14/28] exec: make address spaces 64-bit wide, Mike Day, 2014/01/20