The patch titled
paravirtualization: More generic paravirtualization entry point.
has been removed from the -mm tree. Its filename was
paravirtualization-more-generic-paravirtualization.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: paravirtualization: More generic paravirtualization entry point.
From: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
1) Each hypervisor writes a probe function to detect whether we are
running under that hypervisor. paravirt_probe() registers this
function.
2) If vmlinux is booted with ring != 0, we call all the probe
functions (with registers except %esp intact) in link order: the
winner will not return.
Signed-off-by: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>
Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Cc: Zachary Amsden <zach@xxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
arch/i386/kernel/Makefile | 2 +
arch/i386/kernel/head.S | 33 +++++++++++++++++++++++++++++++
arch/i386/kernel/paravirt.c | 4 +++
arch/i386/kernel/vmlinux.lds.S | 6 +++++
include/asm-i386/paravirt.h | 5 ++++
5 files changed, 50 insertions(+)
diff -puN arch/i386/kernel/Makefile~paravirtualization-more-generic-paravirtualization arch/i386/kernel/Makefile
--- a/arch/i386/kernel/Makefile~paravirtualization-more-generic-paravirtualization
+++ a/arch/i386/kernel/Makefile
@@ -39,6 +39,8 @@ obj-$(CONFIG_VM86) += vm86.o
obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
obj-$(CONFIG_HPET_TIMER) += hpet.o
obj-$(CONFIG_K8_NB) += k8.o
+
+# Make sure this is linked after any other paravirt_ops structs: see head.S
obj-$(CONFIG_PARAVIRT) += paravirt.o
EXTRA_AFLAGS := -traditional
diff -puN arch/i386/kernel/head.S~paravirtualization-more-generic-paravirtualization arch/i386/kernel/head.S
--- a/arch/i386/kernel/head.S~paravirtualization-more-generic-paravirtualization
+++ a/arch/i386/kernel/head.S
@@ -55,6 +55,12 @@
*/
ENTRY(startup_32)
+#ifdef CONFIG_PARAVIRT
+ movl %cs, %eax
+ testl $0x3, %eax
+ jnz startup_paravirt
+#endif
+
/*
* Set segments to known values.
*/
@@ -486,6 +492,33 @@ ignore_int:
#endif
iret
+#ifdef CONFIG_PARAVIRT
+startup_paravirt:
+ cld
+ movl $(init_thread_union+THREAD_SIZE),%esp
+
+ /* We take pains to preserve all the regs. */
+ pushl %edx
+ pushl %ecx
+ pushl %eax
+
+ /* paravirt.o is last in link, and that probe fn never returns */
+ pushl $__start_paravirtprobe
+1:
+ movl 0(%esp), %eax
+ pushl (%eax)
+ movl 8(%esp), %eax
+ call *(%esp)
+ popl %eax
+
+ movl 4(%esp), %eax
+ movl 8(%esp), %ecx
+ movl 12(%esp), %edx
+
+ addl $4, (%esp)
+ jmp 1b
+#endif
+
/*
* Real beginning of normal "text" segment
*/
diff -puN arch/i386/kernel/paravirt.c~paravirtualization-more-generic-paravirtualization arch/i386/kernel/paravirt.c
--- a/arch/i386/kernel/paravirt.c~paravirtualization-more-generic-paravirtualization
+++ a/arch/i386/kernel/paravirt.c
@@ -19,6 +19,7 @@
#include <linux/module.h>
#include <linux/efi.h>
#include <linux/bcd.h>
+#include <linux/start_kernel.h>
#include <asm/bug.h>
#include <asm/paravirt.h>
@@ -382,6 +383,9 @@ 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,
diff -puN arch/i386/kernel/vmlinux.lds.S~paravirtualization-more-generic-paravirtualization arch/i386/kernel/vmlinux.lds.S
--- a/arch/i386/kernel/vmlinux.lds.S~paravirtualization-more-generic-paravirtualization
+++ a/arch/i386/kernel/vmlinux.lds.S
@@ -61,6 +61,12 @@ SECTIONS
CONSTRUCTORS
} :data
+ __start_paravirtprobe = .;
+ .paravirtprobe : AT(ADDR(.paravirtprobe) - LOAD_OFFSET) {
+ *(.paravirtprobe)
+ }
+ __stop_paravirtprobe = .;
+
. = ALIGN(4096);
.data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {
__nosave_begin = .;
diff -puN include/asm-i386/paravirt.h~paravirtualization-more-generic-paravirtualization include/asm-i386/paravirt.h
--- a/include/asm-i386/paravirt.h~paravirtualization-more-generic-paravirtualization
+++ a/include/asm-i386/paravirt.h
@@ -120,6 +120,11 @@ struct paravirt_ops
void (fastcall *iret)(void);
};
+/* Mark a paravirt probe function. */
+#define paravirt_probe(fn) \
+ static void (*__paravirtprobe_##fn)(void) __attribute_used__ \
+ __attribute__((__section__(".paravirtprobe"))) = fn
+
extern struct paravirt_ops paravirt_ops;
#define paravirt_enabled() (paravirt_ops.paravirt_enabled)
_
Patches currently in -mm which might be from rusty@xxxxxxxxxxxxxxx are
origin.patch
prep-for-paravirt-be-careful-about-touching-bios.patch
prep-for-paravirt-be-careful-about-touching-bios-warning-fix.patch
paravirtualization-header-and-stubs-for-fix.patch
paravirtualization-patch-inline-replacements-for-fix-2.patch
paravirtualization-patch-inline-replacements-for-fix-3.patch
paravirtualization-more-generic-paravirtualization-warning-fix.patch
generic-bug-implementation.patch
generic-bug-for-i386.patch
generic-bug-for-x86-64.patch
bug-test-1.patch
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