On Friday 11 June 2010 14:23:58 Joerg Roedel wrote:
> On Fri, Jun 11, 2010 at 12:11:21PM +0200, Christoph Egger wrote:
> > - if ((rdmsr_safe(MSR_K8_ENABLE_C1E, lo, hi) == 0) &&
> > - (lo & (3u << 27)) &&
> > - (wrmsr_safe(MSR_K8_ENABLE_C1E, lo & ~(3u << 27), hi) != 0))
> > - printk(KERN_ERR "Failed to disable C1E on CPU#%u (%08x)\n",
> > - smp_processor_id(), lo);
> > + if ((rdmsr_safe(MSR_K8_ENABLE_C1E, msr_content) == 0) &&
> > + (msr_content & (3u << 27)) &&
> > + (wrmsr_safe(MSR_K8_ENABLE_C1E, msr_content & ~(3u << 27)) != 0))
> > + printk(KERN_ERR "Failed to disable C1E on CPU#%u
> > (%16"PRIx64")\n",
> > + smp_processor_id(), msr_content);
>
> Broken. Please use ull instead of just u in your masks, especially the
> last one.
Thanks for pointing this out. Attached patch fixes this.
Signed-off-by: Christoph Egger <Christoph.Egger@xxxxxxx>
>
> > void mtrr_wrmsr(unsigned msr, unsigned a, unsigned b)
> > {
> > - if (wrmsr_safe(msr, a, b) < 0)
> > + uint64_t msr_content;
> > +
> > + msr_content = ((uint64_t)b << 32) | a;
> > + if (wrmsr_safe(msr, msr_content) < 0)
> > printk(KERN_ERR
> > "MTRR: CPU %u: Writing MSR %x to %x:%x failed\n",
> > smp_processor_id(), msr, a, b);
>
> Since you keep the two unsigned parameters of the function this change
> complicates the code more than it cleans up.
Fixed in c/s 21603.
Christoph
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xen_msrsafe_fix.diff
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