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KVM: SVM: Make set_msr_interception more reliable

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set_msr_interception() is used by svm to set up which MSRs should be
intercepted.  It can only fail if someone has changed the code to try
to intercept an MSR without updating the array of ranges.

The return value is ignored anyway: it should just BUG() if it doesn't
work.  (A build-time failure would be better, but that's tricky).

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Rusty Russell 2007-07-31 20:42:42 +10:00 committed by Avi Kivity
parent 7e9d619d2a
commit bfc733a7a3
1 changed files with 4 additions and 5 deletions
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9
drivers/kvm/svm.c
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@ -359,8 +359,8 @@ err_1:
}
static int set_msr_interception(u32 *msrpm, unsigned msr,
int read, int write)
static void set_msr_interception(u32 *msrpm, unsigned msr,
int read, int write)
{
int i;
@ -375,11 +375,10 @@ static int set_msr_interception(u32 *msrpm, unsigned msr,
u32 mask = ((write) ? 0 : 2) | ((read) ? 0 : 1);
*base = (*base & ~(0x3 << msr_shift)) |
(mask << msr_shift);
return 1;
return;
}
}
printk(KERN_DEBUG "%s: not found 0x%x\n", __FUNCTION__, msr);
return 0;
BUG();
}
static __init int svm_hardware_setup(void)