On 02.07.19 18:09, Andrew Cooper wrote:
On 28/05/2019 11:32, Juergen Gross wrote:
Instead of dynamically decide whether the previous vcpu was using full
"deciding"
or default GDT just add a percpu variable for that purpose. This at
"was using a full or default GDT, just add"
once removes the need for testing vcpu_ids to differ twice.
Cache the need_full_gdt(nd) value in a local variable.
What's the point of doing this? I know the logic is rather complicated
in __context_switch(), but at least it is visually consistent. After
this change, it is asymmetric and harder to follow.
This is a hot path. need_full_gdt() needs two compares, of which one is
using evaluate_nospec().
Juergen
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