Re: [EXTERNAL] Re: [PATCH 5/9] x86/hyperv: Use vmmcall to implement Hyper-V hypercall in sev-snp enlightened guest

[Peter Zijlstra]

On Tue, Jun 27, 2023 at 03:38:35PM +0200, Peter Zijlstra wrote:

> That said; there is a tiny difference between:
> 
> ALTERNATIVE_2(oldinst, newinst1, flag1, newinst2, flag2)
> 
> and
> 
> ALTERNATIVE(ALTERNATIVE(oldinst, newinst1, flag1),
> 	    newinst2, flag2)
> 
> and that is alt_instr::instrlen, when the inner alternative is the
> smaller, then the outer alternative will add additional padding that the
> inner (obviously) doesn't know about.

New version:

https://lkml.kernel.org/r/20230628104952.GA2439977%40hirez.programming.kicks-ass.net