lkml.org 
[lkml]   [2021]   [Nov]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH] x86/paravirt: Fix build PARAVIRT_XXL=y without XEN_PV
From
Date
On 11/17/21 3:04 PM, Sathyanarayanan Kuppuswamy wrote:
> 1. Directly substitute TDVMCALLs in places where we require emulation.
...
> Since option#1 is not a scalable approach,

Why is this not "scalable"? Just eyeballing the problem, here's my
laptop's kernel:

$ objdump -d vmlinux | grep 'hlt ' | awk -F: '{print $1}' | while read
addr; do addr2line -e vmlinux $addr; done
arch/x86/include/asm/irqflags.h:51
arch/x86/include/asm/irqflags.h:51
arch/x86/include/asm/irqflags.h:57
arch/x86/include/asm/irqflags.h:57
arch/x86/include/asm/irqflags.h:57
arch/x86/include/asm/irqflags.h:57
arch/x86/include/asm/irqflags.h:51
arch/x86/include/asm/irqflags.h:51
arch/x86/include/asm/irqflags.h:51
arch/x86/kernel/fpu/init.c:84
arch/x86/include/asm/irqflags.h:57

There are a grand total of 3 sites from which a hlt originates. With
only 11 possible instances and 3 sites to patch, I'm not sure anything
here needs to be "scalable".

I'd suspect half these sites aren't even reachable on a TDX system.

\
 
 \ /
  Last update: 2021-11-18 00:34    [W:0.121 / U:0.064 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site