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Date: Fri, 22 Mar 2019 06:54:27 +0100 From: Juergen Gross <jgross@...e.com> To: Linus Torvalds <torvalds@...ux-foundation.org>, Andy Lutomirski <luto@...capital.net> Cc: Peter Zijlstra <peterz@...radead.org>, Steven Rostedt <rostedt@...dmis.org>, LKML <linux-kernel@...r.kernel.org>, "H. Peter Anvin" <hpa@...or.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>, Joel Fernandes <joel@...lfernandes.org>, He Zhe <zhe.he@...driver.com> Subject: Re: [RFC][PATCH] tracing/x86: Save CR2 before tracing irqsoff on error_entry On 21/03/2019 19:18, Linus Torvalds wrote: > On Thu, Mar 21, 2019 at 11:05 AM Andy Lutomirski <luto@...capital.net> wrote: >> >> In the long run, I think the right solution is to rewrite even more of >> this mess in C. We really ought to be able to put the IRQ flag >> tracing and the context tracking into C code. > > Tangentially about this long run thing - can we start discussing just > dropping PV mode entirely in the long run? Or even not-so-long run? As Andrew already said: the work is ongoing, but hard. What I'm planning to do, however, is dropping 32-bit PV code from the kernel not too far in the future. This is only a small step, but it is a move in the right direction. Juergen
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