On Tue, 2018-01-23 at 21:28 +0100, Borislav Petkov wrote:
>
> > flags = (flags & EFLAGS_MASK) | X86_EFLAGS_IF;
> > - asm("push %[flags]; popf; call *%[fastop]"
> > - : "=a"(rc) : [fastop]"r"(fop), [flags]"r"(flags));
> > + asm("push %[flags]; popf; " CALL_NOSPEC
> > + : "=a"(rc) : [thunk_target]"r"(fop), [flags]"r"(flags));
>
> Oh, "thunk_target" is magical.You can use THUNK_TARGET(fop), which will be "rm" on 32-bit and avoids register starvation in some cases (I don't think the hyperv calls worked until I did that).
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