Displaying 18 results from an estimated 18 matches for "__alt_instructions".
2023 Jun 08
3
[RFC PATCH 0/3] x86/paravirt: Get rid of paravirt patching
This is a small series getting rid of paravirt patching by switching
completely to alternative patching for the same functionality.
The basic idea is to add the capability to switch from indirect to
direct calls via a special alternative patching option.
This removes _some_ of the paravirt macro maze, but most of it needs
to stay due to the need of hiding the call instructions from the
compiler
2023 Jun 08
3
[RFC PATCH 0/3] x86/paravirt: Get rid of paravirt patching
This is a small series getting rid of paravirt patching by switching
completely to alternative patching for the same functionality.
The basic idea is to add the capability to switch from indirect to
direct calls via a special alternative patching option.
This removes _some_ of the paravirt macro maze, but most of it needs
to stay due to the need of hiding the call instructions from the
compiler
2007 Apr 18
0
[RFC/PATCH PV_OPS X86_64 10/17] paravirt_ops - boot changes
...e) - LOAD_OFFSET) {
+ __start_paravirtprobe = .;
+ *(.paravirtprobe);
+ *(.paravirtprobe_failsafe);
+ __stop_paravirtprobe = .;
+ }
+
_edata = .; /* End of data section */
. = ALIGN(PAGE_SIZE);
@@ -180,14 +187,20 @@ SECTIONS
__con_initcall_end = .;
SECURITY_INIT
. = ALIGN(8);
- __alt_instructions = .;
.altinstructions : AT(ADDR(.altinstructions) - LOAD_OFFSET) {
+ __alt_instructions = .;
*(.altinstructions)
+ __alt_instructions_end = .;
}
- __alt_instructions_end = .;
.altinstr_replacement : AT(ADDR(.altinstr_replacement) - LOAD_OFFSET) {
*(.altinstr_replacement)
}
+ ....
2007 Apr 18
0
[RFC/PATCH PV_OPS X86_64 10/17] paravirt_ops - boot changes
...e) - LOAD_OFFSET) {
+ __start_paravirtprobe = .;
+ *(.paravirtprobe);
+ *(.paravirtprobe_failsafe);
+ __stop_paravirtprobe = .;
+ }
+
_edata = .; /* End of data section */
. = ALIGN(PAGE_SIZE);
@@ -180,14 +187,20 @@ SECTIONS
__con_initcall_end = .;
SECURITY_INIT
. = ALIGN(8);
- __alt_instructions = .;
.altinstructions : AT(ADDR(.altinstructions) - LOAD_OFFSET) {
+ __alt_instructions = .;
*(.altinstructions)
+ __alt_instructions_end = .;
}
- __alt_instructions_end = .;
.altinstr_replacement : AT(ADDR(.altinstr_replacement) - LOAD_OFFSET) {
*(.altinstr_replacement)
}
+ ....
2007 Apr 18
7
[patch 0/6] Various cleanups
Hi Andi,
Here's a little batch of cleanups:
- re-enable VDSO when PARAVIRT is enabled
- make the parainstructions symbols match the
other altinstructions naming convention
- add kernel command-line options to disable altinstructions for
smp and pv_ops
Oh, and I'm mailing your noreplacement patch back at you, for no
particularly good reason.
J
--
2007 Apr 18
7
[patch 0/6] Various cleanups
Hi Andi,
Here's a little batch of cleanups:
- re-enable VDSO when PARAVIRT is enabled
- make the parainstructions symbols match the
other altinstructions naming convention
- add kernel command-line options to disable altinstructions for
smp and pv_ops
Oh, and I'm mailing your noreplacement patch back at you, for no
particularly good reason.
J
--
2007 Apr 18
2
[PATCH] Fix potential interrupts during alternative patching [was Re: [RFC] Avoid PIT SMP lockups]
...if (no_replacement) {
printk(KERN_INFO "(SMP-)alternatives turned off\n");
free_init_pages("SMP alternatives",
@@ -351,6 +352,8 @@ void __init alternative_instructions(voi
(unsigned long)__smp_alt_end);
return;
}
+
+ local_irq_save(flags);
apply_alternatives(__alt_instructions, __alt_instructions_end);
/* switch to patch-once-at-boottime-only mode and free the
@@ -386,4 +389,5 @@ void __init alternative_instructions(voi
alternatives_smp_switch(0);
}
#endif
-}
+ local_irq_restore(flags);
+}
2007 Apr 18
2
[PATCH] Fix potential interrupts during alternative patching [was Re: [RFC] Avoid PIT SMP lockups]
...if (no_replacement) {
printk(KERN_INFO "(SMP-)alternatives turned off\n");
free_init_pages("SMP alternatives",
@@ -351,6 +352,8 @@ void __init alternative_instructions(voi
(unsigned long)__smp_alt_end);
return;
}
+
+ local_irq_save(flags);
apply_alternatives(__alt_instructions, __alt_instructions_end);
/* switch to patch-once-at-boottime-only mode and free the
@@ -386,4 +389,5 @@ void __init alternative_instructions(voi
alternatives_smp_switch(0);
}
#endif
-}
+ local_irq_restore(flags);
+}
2017 Oct 04
1
[PATCH 11/13] x86/paravirt: Add paravirt alternatives infrastructure
...+21,7 @@
#include <asm/tlbflush.h>
#include <asm/io.h>
#include <asm/fixmap.h>
+#include <asm/cpufeature.h>
int __read_mostly alternatives_patched;
@@ -269,6 +270,7 @@ static void __init_or_module add_nops(void *insns, unsigned int len)
}
extern struct alt_instr __alt_instructions[], __alt_instructions_end[];
+extern struct alt_instr __pv_alt_instructions[], __pv_alt_instructions_end[];
extern s32 __smp_locks[], __smp_locks_end[];
void *text_poke_early(void *addr, const void *opcode, size_t len);
@@ -598,6 +600,17 @@ int alternatives_text_reserved(void *start, void *end)...
2007 Apr 18
1
[PATCH] (with benchmarks) binary patching of paravirt_ops call sites
...uctions[],
+ __stop_parainstructions[];
+#else
+void apply_paravirt(struct paravirt_patch *start, struct paravirt_patch *end)
+{
+}
+extern char __start_parainstructions[], __stop_parainstructions[];
+#endif /* CONFIG_PARAVIRT */
+
void __init alternative_instructions(void)
{
apply_alternatives(__alt_instructions, __alt_instructions_end);
@@ -318,4 +354,6 @@ void __init alternative_instructions(voi
_text, _etext);
alternatives_smp_switch(0);
}
+
+ apply_paravirt(__start_parainstructions, __stop_parainstructions);
}
diff -urpN --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-...
2007 Apr 18
1
[PATCH] (with benchmarks) binary patching of paravirt_ops call sites
...uctions[],
+ __stop_parainstructions[];
+#else
+void apply_paravirt(struct paravirt_patch *start, struct paravirt_patch *end)
+{
+}
+extern char __start_parainstructions[], __stop_parainstructions[];
+#endif /* CONFIG_PARAVIRT */
+
void __init alternative_instructions(void)
{
apply_alternatives(__alt_instructions, __alt_instructions_end);
@@ -318,4 +354,6 @@ void __init alternative_instructions(voi
_text, _etext);
alternatives_smp_switch(0);
}
+
+ apply_paravirt(__start_parainstructions, __stop_parainstructions);
}
diff -urpN --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-...
2007 Apr 18
2
[PATCH] x86_64 paravirt_ops port
...rtprobe : AT(ADDR(.paravirtprobe) - LOAD_OFFSET) {
+ __start_paravirtprobe = .;
+ *(.paravirtprobe)
+ __stop_paravirtprobe = .;
+ }
+
_edata = .; /* End of data section */
. = ALIGN(PAGE_SIZE);
@@ -177,14 +183,20 @@ SECTIONS
__con_initcall_end = .;
SECURITY_INIT
. = ALIGN(8);
- __alt_instructions = .;
.altinstructions : AT(ADDR(.altinstructions) - LOAD_OFFSET) {
+ __alt_instructions = .;
*(.altinstructions)
+ __alt_instructions_end = .;
}
- __alt_instructions_end = .;
.altinstr_replacement : AT(ADDR(.altinstr_replacement) - LOAD_OFFSET) {
*(.altinstr_replacement)
}
+ ....
2007 Apr 18
2
[PATCH] x86_64 paravirt_ops port
...rtprobe : AT(ADDR(.paravirtprobe) - LOAD_OFFSET) {
+ __start_paravirtprobe = .;
+ *(.paravirtprobe)
+ __stop_paravirtprobe = .;
+ }
+
_edata = .; /* End of data section */
. = ALIGN(PAGE_SIZE);
@@ -177,14 +183,20 @@ SECTIONS
__con_initcall_end = .;
SECURITY_INIT
. = ALIGN(8);
- __alt_instructions = .;
.altinstructions : AT(ADDR(.altinstructions) - LOAD_OFFSET) {
+ __alt_instructions = .;
*(.altinstructions)
+ __alt_instructions_end = .;
}
- __alt_instructions_end = .;
.altinstr_replacement : AT(ADDR(.altinstr_replacement) - LOAD_OFFSET) {
*(.altinstr_replacement)
}
+ ....
2007 Apr 18
3
[PATCH 1/2] paravirt.h header
OK, this is the revised paravirt.h (Andi has seen this before), then the
second is the binary patching stuff. More things get added to the
paravirt struct in future patches, but this basic stuff hasn't changed
for some time.
====
This patch does the dumbest possible replacement of paravirtualized
instructions: calls through a "paravirt_ops" structure. Currently
these are function
2007 Apr 18
8
[PATCH 0/7] x86 paravirtualization infrastructure
The following patches introduce the core infrastructure needed to
paravirtualize the 32-bit x86 Linux kernel. This is done by moving
virtualization sensitive insn's or code paths to a function table,
paravirt_ops. This structure can be populated with hypervisor specific
calls or native stubs and currently support running on bare metal, VMI,
Xen, or Lhype. These patches apply to
2007 Apr 18
8
[PATCH 0/7] x86 paravirtualization infrastructure
The following patches introduce the core infrastructure needed to
paravirtualize the 32-bit x86 Linux kernel. This is done by moving
virtualization sensitive insn's or code paths to a function table,
paravirt_ops. This structure can be populated with hypervisor specific
calls or native stubs and currently support running on bare metal, VMI,
Xen, or Lhype. These patches apply to
2017 Oct 04
31
[PATCH 00/13] x86/paravirt: Make pv ops code generation more closely match reality
This changes the pv ops code generation to more closely match reality.
For example, instead of:
callq *0xffffffff81e3a400 (pv_irq_ops.save_fl)
vmlinux will now show:
pushfq
pop %rax
nop
nop
nop
nop
nop
which is what the runtime version of the code will show in most cases.
This idea was suggested by Andy Lutomirski.
The benefits are:
- For the most common runtime cases
2017 Oct 04
31
[PATCH 00/13] x86/paravirt: Make pv ops code generation more closely match reality
This changes the pv ops code generation to more closely match reality.
For example, instead of:
callq *0xffffffff81e3a400 (pv_irq_ops.save_fl)
vmlinux will now show:
pushfq
pop %rax
nop
nop
nop
nop
nop
which is what the runtime version of the code will show in most cases.
This idea was suggested by Andy Lutomirski.
The benefits are:
- For the most common runtime cases