Re: [Xen-devel] [PATCH 1/3] x86: fix GS-base-dirty determination

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 20/10/17 15:22, Jan Beulich wrote:
> load_segments() writes the two MSRs in their "canonical" positions
> (GS_BASE for the user base, SHADOW_GS_BASE for the kernel one) and uses
> SWAPGS to switch them around if the incoming vCPU is in kernel mode. In
> order to not leave a stale kernel address in GS_BASE when the incoming
> guest is in user mode, the check on the outgoing vCPU needs to be
> dependent upon the mode it is currently in, rather than blindly looking
> at the user base.
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

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

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