Re: [BUG] x86 kenel won't boot under Virtual PC
- From: Arjan van de Ven <arjan@xxxxxxxxxxxxx>
- Date: Sun, 31 Aug 2008 12:27:51 -0700
On Sun, 31 Aug 2008 11:47:04 -0700 (PDT)
Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
On Sun, 31 Aug 2008, David Sanders wrote:
I recently discovered that x86 kernels won't boot under Virtual PC.
What CPU does Virtual PC emulate? As far as Wikipedia is concerned
(not that I'd take it on complete faith) it emulates a 32-bit Intel
Pentium II.
And that commit makes the kernel use the "P6 nops" for such hardware.
Maybe Virtual PC doesn't support the newer intel nop things?
Intel docs say that it should be available on any intel CPU that has
CPUID.01H.EAX[11:8] = 0110B or 1111B. That's the "family ID", and
Pentium II should have a family ID of 6 (ie that 0110B case).
So it sounds like a Virtual PC bug, but I dunno. And maybe we should
just use the legcay nops for anything that isn't modern (ie P4+ or
Core)?
it's probably even a security bug in that I don't see what would be
stopping a ring 3 user process from executing these instructions...
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