[PATCH v2] x86/paravirt: Remove unused paravirt_disable_iospace

[PATCH v2] x86/paravirt: Remove unused paravirt_disable_iospace

[linux]

From: "Dr. David Alan Gilbert" <linux@treblig.org>

The last use of paravirt_disable_iospace() was removed in 2015 by
commit d1c29465b8a5 ("lguest: don't disable iospace.")

Remove it.

Note the comment above it about 'entry.S' is unrelated to this
but stayed when intervening code got deleted.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
---
v2
  Cleaned up the header

 arch/x86/include/asm/paravirt_types.h |  2 --
 arch/x86/kernel/paravirt.c            | 20 --------------------
 2 files changed, 22 deletions(-)

diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h
index fea56b04f436..3c54ac5a9af4 100644
--- a/arch/x86/include/asm/paravirt_types.h
+++ b/arch/x86/include/asm/paravirt_types.h
@@ -242,8 +242,6 @@ extern struct paravirt_patch_template pv_ops;
 
 #define paravirt_ptr(op)	[paravirt_opptr] "m" (pv_ops.op)
 
-int paravirt_disable_iospace(void);
-
 /* This generates an indirect call based on the operation type number. */
 #define PARAVIRT_CALL					\
 	ANNOTATE_RETPOLINE_SAFE				\
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
index 1ccaa3397a67..debe92854774 100644
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -90,26 +90,6 @@ void paravirt_set_sched_clock(u64 (*func)(void))
 	static_call_update(pv_sched_clock, func);
 }
 
-/* These are in entry.S */
-static struct resource reserve_ioports = {
-	.start = 0,
-	.end = IO_SPACE_LIMIT,
-	.name = "paravirt-ioport",
-	.flags = IORESOURCE_IO | IORESOURCE_BUSY,
-};
-
-/*
- * Reserve the whole legacy IO space to prevent any legacy drivers
- * from wasting time probing for their hardware.  This is a fairly
- * brute-force approach to disabling all non-virtual drivers.
- *
- * Note that this must be called very early to have any effect.
- */
-int paravirt_disable_iospace(void)
-{
-	return request_resource(&ioport_resource, &reserve_ioports);
-}
-
 #ifdef CONFIG_PARAVIRT_XXL
 static noinstr void pv_native_write_cr2(unsigned long val)
 {
-- 
2.48.1

Re: [PATCH v2] x86/paravirt: Remove unused paravirt_disable_iospace

[Jürgen Groß]

[-- Attachment #1.1.1: Type: text/plain, Size: 493 bytes --]

On 03.03.25 01:44, linux@treblig.org wrote:
> From: "Dr. David Alan Gilbert" <linux@treblig.org>
> 
> The last use of paravirt_disable_iospace() was removed in 2015 by
> commit d1c29465b8a5 ("lguest: don't disable iospace.")
> 
> Remove it.
> 
> Note the comment above it about 'entry.S' is unrelated to this
> but stayed when intervening code got deleted.
> 
> Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>

Reviewed-by: Juergen Gross <jgross@suse.com>


Juergen

[-- Attachment #1.1.2: OpenPGP public key --]
[-- Type: application/pgp-keys, Size: 3743 bytes --]

[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 495 bytes --]

[tip: x86/cleanups] x86/paravirt: Remove unused paravirt_disable_iospace()

[tip-bot2 for Dr. David Alan Gilbert]

The following commit has been merged into the x86/cleanups branch of tip:

Commit-ID:     47f0008ed7774dd3b12bd5f596e8d106dfea305a
Gitweb:        https://git.kernel.org/tip/47f0008ed7774dd3b12bd5f596e8d106dfea305a
Author:        Dr. David Alan Gilbert <linux@treblig.org>
AuthorDate:    Mon, 03 Mar 2025 00:44:41 
Committer:     Borislav Petkov (AMD) <bp@alien8.de>
CommitterDate: Mon, 03 Mar 2025 10:59:16 +01:00

x86/paravirt: Remove unused paravirt_disable_iospace()

The last use of paravirt_disable_iospace() was removed in 2015 by
commit d1c29465b8a5 ("lguest: don't disable iospace.")

Remove it.

Note the comment above it about 'entry.S' is unrelated to this
but stayed when intervening code got deleted.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/20250303004441.250451-1-linux@treblig.org
---
 arch/x86/include/asm/paravirt_types.h |  2 --
 arch/x86/kernel/paravirt.c            | 20 --------------------
 2 files changed, 22 deletions(-)

diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h
index fea56b0..3c54ac5 100644
--- a/arch/x86/include/asm/paravirt_types.h
+++ b/arch/x86/include/asm/paravirt_types.h
@@ -242,8 +242,6 @@ extern struct paravirt_patch_template pv_ops;
 
 #define paravirt_ptr(op)	[paravirt_opptr] "m" (pv_ops.op)
 
-int paravirt_disable_iospace(void);
-
 /* This generates an indirect call based on the operation type number. */
 #define PARAVIRT_CALL					\
 	ANNOTATE_RETPOLINE_SAFE				\
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
index 1ccaa33..debe928 100644
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -90,26 +90,6 @@ void paravirt_set_sched_clock(u64 (*func)(void))
 	static_call_update(pv_sched_clock, func);
 }
 
-/* These are in entry.S */
-static struct resource reserve_ioports = {
-	.start = 0,
-	.end = IO_SPACE_LIMIT,
-	.name = "paravirt-ioport",
-	.flags = IORESOURCE_IO | IORESOURCE_BUSY,
-};
-
-/*
- * Reserve the whole legacy IO space to prevent any legacy drivers
- * from wasting time probing for their hardware.  This is a fairly
- * brute-force approach to disabling all non-virtual drivers.
- *
- * Note that this must be called very early to have any effect.
- */
-int paravirt_disable_iospace(void)
-{
-	return request_resource(&ioport_resource, &reserve_ioports);
-}
-
 #ifdef CONFIG_PARAVIRT_XXL
 static noinstr void pv_native_write_cr2(unsigned long val)
 {

[tip: x86/core] x86/paravirt: Remove unused paravirt_disable_iospace()

[tip-bot2 for Dr. David Alan Gilbert]

The following commit has been merged into the x86/core branch of tip:

Commit-ID:     3101900218d7b6acbdee8af3e7bcf04acf5bf9ef
Gitweb:        https://git.kernel.org/tip/3101900218d7b6acbdee8af3e7bcf04acf5bf9ef
Author:        Dr. David Alan Gilbert <linux@treblig.org>
AuthorDate:    Mon, 03 Mar 2025 00:44:41 
Committer:     Ingo Molnar <mingo@kernel.org>
CommitterDate: Mon, 03 Mar 2025 11:19:52 +01:00

x86/paravirt: Remove unused paravirt_disable_iospace()

The last use of paravirt_disable_iospace() was removed in 2015 by
commit d1c29465b8a5 ("lguest: don't disable iospace.")

Remove it.

Note the comment above it about 'entry.S' is unrelated to this
but stayed when intervening code got deleted.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/20250303004441.250451-1-linux@treblig.org
---
 arch/x86/include/asm/paravirt_types.h |  2 --
 arch/x86/kernel/paravirt.c            | 20 --------------------
 2 files changed, 22 deletions(-)

diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h
index 8b36a95..8e21a1a 100644
--- a/arch/x86/include/asm/paravirt_types.h
+++ b/arch/x86/include/asm/paravirt_types.h
@@ -242,8 +242,6 @@ extern struct paravirt_patch_template pv_ops;
 
 #define paravirt_ptr(op)	[paravirt_opptr] "m" (pv_ops.op)
 
-int paravirt_disable_iospace(void);
-
 /*
  * This generates an indirect call based on the operation type number.
  *
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
index 1dc114c..d0b789d 100644
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -90,26 +90,6 @@ void paravirt_set_sched_clock(u64 (*func)(void))
 	static_call_update(pv_sched_clock, func);
 }
 
-/* These are in entry.S */
-static struct resource reserve_ioports = {
-	.start = 0,
-	.end = IO_SPACE_LIMIT,
-	.name = "paravirt-ioport",
-	.flags = IORESOURCE_IO | IORESOURCE_BUSY,
-};
-
-/*
- * Reserve the whole legacy IO space to prevent any legacy drivers
- * from wasting time probing for their hardware.  This is a fairly
- * brute-force approach to disabling all non-virtual drivers.
- *
- * Note that this must be called very early to have any effect.
- */
-int paravirt_disable_iospace(void)
-{
-	return request_resource(&ioport_resource, &reserve_ioports);
-}
-
 #ifdef CONFIG_PARAVIRT_XXL
 static noinstr void pv_native_write_cr2(unsigned long val)
 {