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| author | Rusty Russell <rusty@rustcorp.com.au> | 2007-02-13 13:26:26 +0100 |
|---|---|---|
| committer | Andi Kleen <andi@basil.nowhere.org> | 2007-02-13 13:26:26 +0100 |
| commit | 992af68147299bb635be97f789e4f66ba7add477 (patch) | |
| tree | 55c647547b5f5642e78497c2a930d95ee7cf658c | |
| parent | 9af3cf054615862c86efcf55a37bb40f0d96e406 (diff) | |
| download | talos-obmc-linux-992af68147299bb635be97f789e4f66ba7add477.tar.gz talos-obmc-linux-992af68147299bb635be97f789e4f66ba7add477.zip | |
[PATCH] i386: paravirt unhandled fallthrough
The current code simply calls "start_kernel" directly if we're under a
hypervisor and no paravirt_ops backend wants us, because paravirt.c
registers that as a backend.
This was always a vain hope; start_kernel won't get far without setup.
It's also impossible for paravirt_ops backends which don't sit in the
arch/i386/kernel directory: they can't link before paravirt.o anyway.
Keep it simple: if we pass all the registered paravirt probes, BUG().
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andi Kleen <ak@suse.de>
| -rw-r--r-- | arch/i386/kernel/Makefile | 2 | ||||
| -rw-r--r-- | arch/i386/kernel/head.S | 7 | ||||
| -rw-r--r-- | arch/i386/kernel/paravirt.c | 3 |
3 files changed, 6 insertions, 6 deletions
diff --git a/arch/i386/kernel/Makefile b/arch/i386/kernel/Makefile index 97f1e961d684..223969377de4 100644 --- a/arch/i386/kernel/Makefile +++ b/arch/i386/kernel/Makefile @@ -41,8 +41,6 @@ obj-$(CONFIG_HPET_TIMER) += hpet.o obj-$(CONFIG_K8_NB) += k8.o obj-$(CONFIG_VMI) += vmi.o vmitime.o - -# Make sure this is linked after any other paravirt_ops structs: see head.S obj-$(CONFIG_PARAVIRT) += paravirt.o EXTRA_AFLAGS := -traditional diff --git a/arch/i386/kernel/head.S b/arch/i386/kernel/head.S index 734be5572eb9..b322f72ffaad 100644 --- a/arch/i386/kernel/head.S +++ b/arch/i386/kernel/head.S @@ -513,10 +513,11 @@ startup_paravirt: pushl %ecx pushl %eax - /* paravirt.o is last in link, and that probe fn never returns */ pushl $__start_paravirtprobe 1: movl 0(%esp), %eax + cmpl $__stop_paravirtprobe, %eax + je unhandled_paravirt pushl (%eax) movl 8(%esp), %eax call *(%esp) @@ -528,6 +529,10 @@ startup_paravirt: addl $4, (%esp) jmp 1b + +unhandled_paravirt: + /* Nothing wanted us: we're screwed. */ + ud2 #endif /* diff --git a/arch/i386/kernel/paravirt.c b/arch/i386/kernel/paravirt.c index ebe82552ad30..c156ecfa3872 100644 --- a/arch/i386/kernel/paravirt.c +++ b/arch/i386/kernel/paravirt.c @@ -482,9 +482,6 @@ static int __init print_banner(void) } core_initcall(print_banner); -/* We simply declare start_kernel to be the paravirt probe of last resort. */ -paravirt_probe(start_kernel); - struct paravirt_ops paravirt_ops = { .name = "bare hardware", .paravirt_enabled = 0, |
