Re: [PATCH] [19/50] Experimental: detect if SVM is disabled by BIOS | KernelTrap

Re: [PATCH] [19/50] Experimental: detect if SVM is disabled by BIOS

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From: Joerg Roedel <joro@...>

To: Andi Kleen <andi@...>

Cc: <patches@...>, <linux-kernel@...>

Subject: Re: [PATCH] [19/50] Experimental: detect if SVM is disabled by BIOS

Date: Monday, October 1, 2007 - 4:12 pm

On Mon, Oct 01, 2007 at 06:47:50PM +0200, Andi Kleen wrote:
quoted text> On Saturday 22 September 2007 11:17:08 Joerg Roedel wrote:
> > I don't think we need this patch. When SVM is disabled KVM will tell on
> > module load. 
> 
> The point is that people often want to know in advance (before they
> even try to use KVM or Xen) if their CPU and BIOS supports this.

If the CPU supports SVM this is visible to the user because the SVM
feature flag does not disappear when its disabled. But because with CPUs
having the SVM-lock feature it can be re-enabled in a secure way under
some circumstances the information in /proc/cpuinfo will not be
reliable. Maybe we can check for it in identify_cpu() and print to the
kernel log if its disabled? It will be visible to the user through
dmesg.

Joerg
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Messages in current thread:

[PATCH] [0/50] x86 2.6.24 patches review II, Andi Kleen, (Fri Sep 21, 6:31 pm)

[PATCH] [49/50] x86_64: Initialize 64bit registers for a.out..., Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [50/50] x86_64: Remove fpu io port resource, Andi Kleen, (Fri Sep 21, 6:32 pm)

Re: [PATCH] [50/50] x86_64: Remove fpu io port resource, Jeff Garzik, (Fri Sep 21, 7:00 pm)

Re: [PATCH] [50/50] x86_64: Remove fpu io port resource, Andi Kleen, (Mon Oct 1, 6:40 am)

Re: [PATCH] [50/50] x86_64: Remove fpu io port resource, Jeff Garzik, (Mon Oct 1, 7:30 am)

Re: [PATCH] [50/50] x86_64: Remove fpu io port resource, Alan Cox, (Tue Oct 2, 10:37 am)

Re: [PATCH] [50/50] x86_64: Remove fpu io port resource, Andi Kleen, (Mon Oct 1, 7:48 am)

Re: [PATCH] [50/50] x86_64: Remove fpu io port resource, Jeff Garzik, (Mon Oct 1, 9:33 am)

Re: [PATCH] [50/50] x86_64: Remove fpu io port resource, Mark Lord, (Mon Oct 1, 10:16 am)

[PATCH] [48/50] x86_64: return correct error code from child..., Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [46/50] x86: also show non-zero IRQ counts for vecto..., Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [47/50] i386: avoid temporarily inconsistent pte-s, Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [45/50] x86_64: configure HPET_EMULATE_RTC automatic..., Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [44/50] i386: Introduce "used_vectors" bitmap which ..., Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [43/50] x86: multi-byte single instruction NOPs, Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [42/50] i386: constify wd_ops, Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [41/50] i386: fix section mismatch warning in intel.c, Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [40/50] i386: Fix section mismatch, Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [35/50] i386: Do cpuid_device_create() in CPU_UP_PRE..., Andi Kleen, (Fri Sep 21, 6:32 pm)

Re: [PATCH] [35/50] i386: Do cpuid_device_create() in CPU_UP..., Thomas Gleixner, (Sat Sep 22, 3:33 pm)

Re: [PATCH] [35/50] i386: Do cpuid_device_create() in CPU_UP..., Akinobu Mita, (Sat Sep 22, 9:52 pm)

Re: [PATCH] [35/50] i386: Do cpuid_device_create() in CPU_UP..., Thomas Gleixner, (Sun Sep 23, 3:52 am)

[PATCH] [39/50] i386: fix 4 bit apicid assumption of mach-de..., Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [38/50] x86_64: fix off-by-one in find_next_zero_str..., Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [36/50] x86: Use raw locks during oopses, Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [37/50] x86_64: Clean up mce= argument parsing sligh..., Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [34/50] i386: Fix argument signedness warnings, Andi Kleen, (Fri Sep 21, 6:32 pm)

Re: [PATCH] [34/50] i386: Fix argument signedness warnings, Satyam Sharma, (Sat Sep 22, 1:06 am)

Re: [PATCH] [34/50] i386: Fix argument signedness warnings, Jan Engelhardt, (Sat Sep 22, 6:01 am)

Re: [PATCH] [34/50] i386: Fix argument signedness warnings, Randy Dunlap, (Sat Sep 22, 1:42 pm)

[PATCH] [33/50] x86: rename .i assembler includes to .h, Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [32/50] x86: Show last exception from/to register c..., Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [31/50] x86_64: honor notify_die() returning NOTIFY_..., Andi Kleen, (Fri Sep 21, 6:32 pm)

Re: [PATCH] [31/50] x86_64: honor notify_die() returning NOT..., Thomas Gleixner, (Sat Sep 22, 3:23 pm)

[PATCH] [30/50] x86_64: remove some dead code, Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [29/50] x86: honor _PAGE_PSE bit on page walks, Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [28/50] i386: remove stub early_printk.c, Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [27/50] x86_64: Remove duplicated vsyscall nsec update, Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [26/50] i386: export i386 smp_call_function_mask() t..., Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [23/50] x86_64: Implement missing x86_64 function sm..., Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [25/50] x86_64: Add parenthesis to IRQ vector macros, Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [24/50] x86_64: Eliminate result signage problem in ..., Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [22/50] i386: Misc cpuinit annotations, Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [18/50] x86_64: Save registers in saved_context duri..., Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [21/50] i386: Misc cpuinit annotations, Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [13/50] x86: Fix and reenable CLFLUSH support in cha..., Andi Kleen, (Fri Sep 21, 6:32 pm)

Re: [patches] [PATCH] [13/50] x86: Fix and reenable CLFLUSH ..., Jan Beulich, (Mon Sep 24, 4:23 am)

Re: [patches] [PATCH] [13/50] x86: Fix and reenable CLFLUSH ..., Andi Kleen, (Mon Oct 1, 6:38 am)

Re: [PATCH] [13/50] x86: Fix and reenable CLFLUSH support in..., Oleg Verych, (Sat Sep 22, 1:47 am)

Re: [PATCH] [13/50] x86: Fix and reenable CLFLUSH support in..., Andi Kleen, (Mon Oct 1, 6:59 am)

[PATCH] [20/50] x86_64: Fix some broken white space in arch/..., Andi Kleen, (Fri Sep 21, 6:32 pm)

Re: [PATCH] [20/50] x86_64: Fix some broken white space in a..., Thomas Gleixner, (Sat Sep 22, 3:17 pm)

Re: [PATCH] [20/50] x86_64: Fix some broken white space in a..., Oleg Verych, (Sat Sep 22, 9:47 pm)

[PATCH] [16/50] x86: Use macros to modify the PG_arch_1 page..., Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [19/50] Experimental: detect if SVM is disabled by B..., Andi Kleen, (Fri Sep 21, 6:32 pm)

Re: [PATCH] [19/50] Experimental: detect if SVM is disabled ..., Thomas Gleixner, (Sat Sep 22, 3:05 pm)

Re: [PATCH] [19/50] Experimental: detect if SVM is disabled ..., Joerg Roedel, (Sat Sep 22, 5:17 am)

Re: [PATCH] [19/50] Experimental: detect if SVM is disabled ..., Andi Kleen, (Mon Oct 1, 12:47 pm)

Re: [PATCH] [19/50] Experimental: detect if SVM is disabled ..., Joerg Roedel, (Mon Oct 1, 4:12 pm)

Re: [patches] [PATCH] [19/50] Experimental: detect if SVM is..., Andi Kleen, (Mon Oct 1, 5:45 pm)

Re: [patches] [PATCH] [19/50] Experimental: detect if SVM is..., Joerg Roedel, (Mon Oct 1, 6:13 pm)

Re: [PATCH] [19/50] Experimental: detect if SVM is disabled ..., Sam Ravnborg, (Sat Sep 22, 2:59 am)

[PATCH] [17/50] x86_64: remove STR() macros, Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [11/50] x86_64: Install unstripped copy of 64bit vds..., Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [14/50] x86: Minor code-style cleanups to change_pag..., Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [15/50] x86_64: Return EINVAL for unknown address in..., Andi Kleen, (Fri Sep 21, 6:32 pm)

Re: [patches] [PATCH] [15/50] x86_64: Return EINVAL for unkn..., Jan Beulich, (Mon Sep 24, 4:32 am)

[PATCH] [12/50] x86_64: Untable __init references between IO..., Andi Kleen, (Fri Sep 21, 6:32 pm)

Re: [patches] [PATCH] [12/50] x86_64: Untable __init referen..., Yinghai Lu, (Sat Sep 22, 1:37 am)

[PATCH] [7/50] x86: expand /proc/interrupts to include missi..., Andi Kleen, (Fri Sep 21, 6:32 pm)

possible corrections in the docs (Re: [PATCH] [7/50] x86: ex..., Oleg Verych, (Fri Sep 21, 11:35 pm)

Re: possible corrections in the docs (Re: [PATCH] [7/50] x86..., Joe Korty, (Fri Sep 21, 11:52 pm)

[PATCH] [9/50] i386: validate against ACPI motherboard resou..., Andi Kleen, (Fri Sep 21, 6:32 pm)

Re: [PATCH] [9/50] i386: validate against ACPI motherboard r..., Yinghai Lu, (Sat Sep 22, 2:49 am)

Re: [PATCH] [9/50] i386: validate against ACPI motherboard r..., Robert Hancock, (Sat Sep 22, 12:28 pm)

Re: [PATCH] [9/50] i386: validate against ACPI motherboard r..., Yinghai Lu, (Sat Sep 22, 4:47 pm)

Re: [PATCH] [9/50] i386: validate against ACPI motherboard r..., Thomas Gleixner, (Sat Sep 22, 2:01 pm)

Re: [PATCH] [9/50] i386: validate against ACPI motherboard r..., Robert Hancock, (Sat Sep 22, 2:42 pm)

Re: [PATCH] [9/50] i386: validate against ACPI motherboard r..., Yinghai Lu, (Sat Sep 22, 4:40 pm)

Re: [PATCH] [9/50] i386: validate against ACPI motherboard r..., Robert Hancock, (Sat Sep 22, 5:27 pm)

Re: [PATCH] [9/50] i386: validate against ACPI motherboard r..., Yinghai Lu, (Sat Sep 22, 9:34 pm)

Re: [PATCH] [9/50] i386: validate against ACPI motherboard r..., Yinghai Lu, (Sat Sep 22, 9:20 pm)

Re: [PATCH] [9/50] i386: validate against ACPI motherboard r..., H. Peter Anvin, (Sat Sep 22, 4:56 pm)

Re: [PATCH] [9/50] i386: validate against ACPI motherboard r..., Yinghai Lu, (Sat Sep 22, 2:56 am)

[PATCH] [10/50] x86_64: install unstripped copies of compat ..., Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [6/50] i386: clean up oops/bug reports, Andi Kleen, (Fri Sep 21, 6:32 pm)

Killing printk calls for size (Re: [PATCH] [6/50] i386: clea..., Oleg Verych, (Fri Sep 21, 10:51 pm)

Re: [PATCH] [6/50] i386: clean up oops/bug reports, Chuck Ebbert, (Fri Sep 21, 6:41 pm)

Re: [PATCH] [6/50] i386: clean up oops/bug reports, Jan Engelhardt, (Sat Sep 22, 5:47 am)

[PATCH] [8/50] x86_64: remove x86_cpu_to_log_apicid, Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [5/50] i386: change order in Kconfig.cpu, Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [4/50] x86: add cpu codenames for Kconfig.cpu, Andi Kleen, (Fri Sep 21, 6:32 pm)

Re: [PATCH] [4/50] x86: add cpu codenames for Kconfig.cpu, Thomas Gleixner, (Sat Sep 22, 1:50 pm)

Re: [PATCH] [4/50] x86: add cpu codenames for Kconfig.cpu, Andi Kleen, (Mon Oct 1, 7:17 am)

Re: [PATCH] [4/50] x86: add cpu codenames for Kconfig.cpu, Dave Jones, (Fri Sep 21, 6:45 pm)

Re: [PATCH] [4/50] x86: add cpu codenames for Kconfig.cpu, Andi Kleen, (Sun Sep 30, 6:09 am)

Re: [PATCH] [4/50] x86: add cpu codenames for Kconfig.cpu, Sam Ravnborg, (Sat Sep 22, 2:57 am)

Re: [PATCH] [4/50] x86: add cpu codenames for Kconfig.cpu, Dave Jones, (Sat Sep 22, 10:23 am)

Re: [PATCH] [4/50] x86: add cpu codenames for Kconfig.cpu, Randy Dunlap, (Sat Sep 22, 1:40 pm)

Re: [PATCH] [4/50] x86: add cpu codenames for Kconfig.cpu, Jan Engelhardt, (Sat Sep 22, 5:46 am)

Re: [PATCH] [4/50] x86: add cpu codenames for Kconfig.cpu, Alan Cox, (Fri Sep 21, 7:52 pm)

[PATCH] [3/50] x86_64: remove never used apic_mapped, Andi Kleen, (Fri Sep 21, 6:32 pm)

[PATCH] [2/50] x86_64: use core id bits for apicid_to_node i..., Andi Kleen, (Fri Sep 21, 6:31 pm)

[PATCH] [1/50] x86_64: store core id bits in cpuinfo_x8, Andi Kleen, (Fri Sep 21, 6:31 pm)

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