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xen-devel
Re: [Xen-devel] [PATCH] FP fix for x86-64 xenlinux
On 6 Jun 2005, at 09:23, Nakajima, Jun wrote:
That's better. I'll send another patch. BTW, they are defined like the
below for x86 xenlinux:
#define read_cr0() \
BUG();
#define write_cr0(x) \
BUG();
We need to fix this as well.
Ah. I guess raid6 accesses %cr0 via its own assembly macros. But yes, I
think defining the above, and read/write_cr4, the same as native is the
right thing to do. We can then add in extra functionality to the
emulation as required. I don't think this will mask bugs in the guest
OS -- accesses to %cr4 currently aren;t emulated anyway so they will
crash just as they do today. I may tighten up emulation of %cr0 a bit
so toggling of unexpected bits at least causes a DPRINTK.
-- Keir
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