Messages in this thread Patch in this message | | | Date | Tue, 03 Apr 2007 18:07:01 -0700 | From | Jeremy Fitzhardinge <> | Subject | [patch 6/6] Allow boot-time disable of paravirt_ops patching |
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Add "noreplace-paravirt" to disable paravirt_ops patching.
Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Cc: Rusty Russell <rusty@rustcorp.com.au>
--- Documentation/kernel-parameters.txt | 3 +++ arch/i386/kernel/alternative.c | 13 +++++++++++++ 2 files changed, 16 insertions(+)
=================================================================== --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -64,6 +64,7 @@ parameter is applicable: GENERIC_TIME The generic timeofday code is enabled. NFS Appropriate NFS support is enabled. OSS OSS sound support is enabled. + PV_OPS A paravirtualized kernel PARIDE The ParIDE subsystem is enabled. PARISC The PA-RISC architecture is enabled. PCI PCI bus support is enabled. @@ -1134,6 +1135,8 @@ and is between 256 and 4096 characters. nomca [IA-64] Disable machine check abort handling nomce [IA-32] Machine Check Exception + + noreplace-paravirt [IA-32,PV_OPS] Don't patch paravirt_ops noreplace-smp [IA-32,SMP] Don't replace SMP instructions with UP alternatives =================================================================== --- a/arch/i386/kernel/alternative.c +++ b/arch/i386/kernel/alternative.c @@ -30,6 +30,16 @@ static int __init setup_noreplace_smp(ch } __setup("noreplace-smp", setup_noreplace_smp); +#ifdef CONFIG_PARAVIRT +static int noreplace_paravirt = 0; + +static int __init setup_noreplace_paravirt(char *str) +{ + noreplace_paravirt = 1; + return 1; +} +__setup("noreplace-paravirt", setup_noreplace_paravirt); +#endif #define DPRINTK(fmt, args...) if (debug_alternative) \ printk(KERN_DEBUG fmt, args) @@ -329,6 +339,9 @@ void apply_paravirt(struct paravirt_patc { struct paravirt_patch *p; + if (noreplace_paravirt) + return; + for (p = start; p < end; p++) { unsigned int used; --
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