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Re: [Xen-devel] [PATCH] x86/msr: Correct the definition of MSR_IA32_APICBASE_BASE

To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
From: Wei Liu <wei.liu2@xxxxxxxxxx>
Date: Tue, 3 Oct 2017 17:41:40 +0100
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxx>
Delivery-date: Tue, 03 Oct 2017 16:41:54 +0000
List-id: Xen developer discussion <xen-devel.lists.xen.org>

On Tue, Oct 03, 2017 at 03:48:56PM +0100, Andrew Cooper wrote:
> 0xfffff << 12 is undefined behaviour, due to shifting into the sign bit of an
> integer.
> 
> Spotted by the Undefined Behaviour Sanitiser
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

Reviewed-by: Wei Liu <wei.liu2@xxxxxxxxxx>

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References:
- [Xen-devel] [PATCH] x86/msr: Correct the definition of MSR_IA32_APICBASE_BASE
  - From: Andrew Cooper

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