On 08/02/2010 05:11 PM, Roedel, Joerg wrote:
What is this testing exactly? There is no svm function directly
associated with mode switch. In fact, most L1s will intercept cr and
efer access and emulate the mode switch, rather than letting L2 perform
the mode switch directly.
This is testing the failure case without the nested-svm efer patch I
submitted last week. The sequence above (which switches from long mode
to real mode and back to long mode) fails without this patch.
A direct test would be to
mov $MSR_EFER, %ecx
rdmsr
xor $EFER_NX, %eax
wrmsr
and see that L1 EFER was updated.
I don't object to the more complicated test, but in general prefer
simpler, direct tests so that when they fail we know exactly why.
--
error compiling committee.c: too many arguments to function
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