Messages in this thread | | | From | "Li, Xin3" <> | Subject | RE: [PATCH v6 0/5] x86: Enable LKGS instruction | Date | Fri, 13 Jan 2023 18:26:16 +0000 |
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> > > > LKGS instruction is introduced with Intel FRED (flexible return > > > > and event delivery) specification. As LKGS is independent of FRED, > > > > we enable it as a standalone CPU feature. > > > > > > > > LKGS behaves like the MOV to GS instruction except that it loads > > > > the base address into the IA32_KERNEL_GS_BASE MSR instead of the > > > > GS segment’s descriptor cache, which is exactly what Linux kernel > > > > does to load user level GS base. Thus, with LKGS, there is no > > > > need to SWAPGS away from the kernel GS base. > > > > > > Ok, this looks good to me. > > > > > > I've applied the first 4 patches to tip:x86/cpu, as the instruction > > > exists in a public document and these patches are fine stand-alone > > > as well, such as the factoring out of load_gs_index() methods from a > > > high-use low level header into a new header file. > > > > > > Planning to apply the final, LKGS enabler patch as well, unless > > > there's any objections from others? > > > > Nah, I think that thing's bike-shedded to near death. Let's just do it. > > Ok - applied the #5 patch to tip:x86/cpu, for a v6.3 merge. > > Thanks, > > Ingo
Thanks a lot! Xin
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