Re: [Xen-devel] [PATCH v2] x86: defer not-present segment checks

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 10/10/16 11:04, Jan Beulich wrote:
> Following on from commits 5602e74c60 ("x86emul: correct loading of
> %ss") and bdb860d01c ("x86/HVM: correct segment register loading during
> task switch") the point of the non-.present checks needs to be refined:
> #NP (and its #SS companion), other than suggested by the various
> instruction pages in Intel's SDM, gets checked for only after all type
> and permission checks. The only checks getting done even later are the
> long mode specific ones for system descriptors (which we don't support
> yet) and 64-bit code segments (i.e. anything touching other than the
> attribute byte).
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

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