From mboxrd@z Thu Jan  1 00:00:00 1970
From: Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH v4 45/75] x86/sev-es: Adjust #VC IST Stack on entering
 NMI handler
Date: Wed, 15 Jul 2020 12:56:29 +0200
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To: Joerg Roedel <jroedel@suse.de>
Cc: Juergen Gross <jgross@suse.com>, Tom Lendacky <thomas.lendacky@amd.com>, Dave Hansen <dave.hansen@linux.intel.com>, Mike Stunes <mstunes@vmware.com>, Kees Cook <keescook@chromium.org>, kvm@vger.kernel.org, Cfir Cohen <cfir@google.com>, Joerg Roedel <joro@8bytes.org>, x86@kernel.org, linux-kernel@vger.kernel.org, Sean Christopherson <sean.j.christopherson@intel.com>, virtualization@lists.linux-foundation.org, Martin Radev <martin.b.radev@gmail.com>, Masami Hiramatsu <mhiramat@kernel.org>, Andy Lutomirski <luto@kernel.org>, hpa@zytor.com, Erdem Aktas <erdemaktas@google.com>, David Rientjes <rientjes@google.com>, Dan Williams <dan.j.williams@intel.com>, Jiri Slaby <jslaby@suse.cz>
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On Wed, Jul 15, 2020 at 12:26:53PM +0200, Joerg Roedel wrote:
> On Wed, Jul 15, 2020 at 11:47:02AM +0200, Peter Zijlstra wrote:

> > That's pretty disguisting :-(
> 
> Yeah, but its needed because ... IST :(
> I am open for suggestions on how to make it less disgusting. Or maybe
> you like it more if you think of it as a software implementation of what
> hardware should actually do to make IST less painful.

No bright ideas, sadly..