On April 25, 2025 5:33:17 AM PDT, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote: >On Wed, Apr 23, 2025 at 06:05:19PM +0200, Jürgen Groß wrote: > >> > It's not a major change, but when it is patched to use the immediate >> > form MSR write instruction, it's straightforwardly streamlined. >> >> It should be rather easy to switch the current wrmsr/rdmsr paravirt patching >> locations to use the rdmsr/wrmsr instructions instead of doing a call to >> native_*msr(). > >Right, just make the Xen functions asm stubs that expect the instruction >registers instead of C-abi and ALT_NOT_XEN the thing. > >Shouldn't be hard at all. And that's what we will be doing. We already have code for that.
