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Groups > linux.kernel > #1512995
| From | Borislav Petkov <bp@alien8.de> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH 0/8] x86/fpu: Remove CR0.TS support |
| Date | 2016-11-01 01:00 +0100 |
| Message-ID | <syuEF-LM-1@gated-at.bofh.it> (permalink) |
| References | <syt5U-8pE-3@gated-at.bofh.it> <sytyW-8o-19@gated-at.bofh.it> <sytSh-uI-9@gated-at.bofh.it> <syu1Y-yg-21@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Tue, Nov 01, 2016 at 12:10:48AM +0100, Paul Bolle wrote:
> See https://lists.ozlabs.org/pipermail/lguest/2013-May/002001.html .
> Nobody cared enough to fix it. I cared enough to figure it all out. But
> I didn't understand much of the possible solutions that where suggested
> three years ago.
I'm guessing the simple fix would be this:
---
diff --git a/drivers/lguest/Kconfig b/drivers/lguest/Kconfig
index 169172d2ba05..9c08b3050bb7 100644
--- a/drivers/lguest/Kconfig
+++ b/drivers/lguest/Kconfig
@@ -1,6 +1,6 @@
config LGUEST
tristate "Linux hypervisor example code"
- depends on X86_32 && EVENTFD && TTY && PCI_DIRECT
+ depends on X86_32 && EVENTFD && TTY && PCI_DIRECT && !MICROCODE
select HVC_DRIVER
---help---
This is a very simple module which allows you to run
---
but maybe the better fix is to hack in MSR emulation in lguest and
intercept the *MSR accesses and do the writes/reads in the exception
fixup and ...
I haven't looked at the lguest code, of course and whether that's easily
doable and whether it even makes sense and whether one should simply use
qemu/kvm instead and, and, and...
--
Regards/Gruss,
Boris.
ECO tip #101: Trim your mails when you reply.
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[PATCH 0/8] x86/fpu: Remove CR0.TS support Andy Lutomirski <luto@kernel.org> - 2016-10-31 23:20 +0100
[PATCH 5/8] lguest: Remove CR0.TS support Andy Lutomirski <luto@kernel.org> - 2016-10-31 23:30 +0100
[tip:x86/fpu] x86/fpu, lguest: Remove CR0.TS support tip-bot for Andy Lutomirski <tipbot@zytor.com> - 2016-11-01 08:20 +0100
[PATCH 8/8] x86/fpu: Remove clts() Andy Lutomirski <luto@kernel.org> - 2016-10-31 23:30 +0100
[tip:x86/fpu] x86/fpu: Remove clts() tip-bot for Andy Lutomirski <tipbot@zytor.com> - 2016-11-01 08:20 +0100
[PATCH 2/8] fpu/bugs: Stop saving and restoring CR0.TS in fpu__init_check_bugs() Andy Lutomirski <luto@kernel.org> - 2016-10-31 23:30 +0100
[tip:x86/fpu] x86/fpu: Stop saving and restoring CR0.TS in fpu__init_check_bugs() tip-bot for Andy Lutomirski <tipbot@zytor.com> - 2016-11-01 08:20 +0100
[PATCH 7/8] x86/fpu: Remove stts() Andy Lutomirski <luto@kernel.org> - 2016-10-31 23:30 +0100
[tip:x86/fpu] x86/fpu: Remove stts() tip-bot for Andy Lutomirski <tipbot@zytor.com> - 2016-11-01 08:20 +0100
Re: [PATCH 0/8] x86/fpu: Remove CR0.TS support Paul Bolle <pebolle@tiscali.nl> - 2016-10-31 23:50 +0100
Re: [PATCH 0/8] x86/fpu: Remove CR0.TS support Borislav Petkov <bp@alien8.de> - 2016-11-01 00:10 +0100
Re: [PATCH 0/8] x86/fpu: Remove CR0.TS support Paul Bolle <pebolle@tiscali.nl> - 2016-11-01 00:20 +0100
Re: [PATCH 0/8] x86/fpu: Remove CR0.TS support Borislav Petkov <bp@alien8.de> - 2016-11-01 01:00 +0100
Re: [PATCH 0/8] x86/fpu: Remove CR0.TS support Paul Bolle <pebolle@tiscali.nl> - 2016-11-01 09:00 +0100
Re: [PATCH 0/8] x86/fpu: Remove CR0.TS support Borislav Petkov <bp@alien8.de> - 2016-11-01 10:00 +0100
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