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* [PATCH 0/2] x86/sev-es: Remove dead code
@ 2020-10-05 15:12 Arvind Sankar
  2020-10-05 15:12 ` [PATCH 1/2] x86/boot: Remove unused finalize_identity_maps() Arvind Sankar
  2020-10-05 15:12 ` [PATCH 2/2] x86/head/64: Remove unused GET_CR2_INTO() macro Arvind Sankar
  0 siblings, 2 replies; 5+ messages in thread
From: Arvind Sankar @ 2020-10-05 15:12 UTC (permalink / raw)
  To: x86, Joerg Roedel; +Cc: linux-kernel

Delete some unused macros and an unused function.

One question:
  4b47cdbda6f1 ("x86/head/64: Move early exception dispatch to C code")
uses native_read_cr2(), while the asm code it replaces may use paravirt
to read cr2. Is this intentional or should it be using read_cr2()?

Arvind Sankar (2):
  x86/boot: Remove unused finalize_identity_maps()
  x86/head/64: Remove unused GET_CR2_INTO() macro

 arch/x86/boot/compressed/ident_map_64.c | 10 ----------
 arch/x86/include/asm/paravirt.h         | 11 -----------
 arch/x86/kernel/asm-offsets.c           |  1 -
 arch/x86/kernel/head_64.S               |  9 ---------
 4 files changed, 31 deletions(-)

-- 
2.26.2


^ permalink raw reply	[flat|nested] 5+ messages in thread
* [PATCH 1/2] x86/boot: Remove unused finalize_identity_maps()
  2020-10-05 15:12 [PATCH 0/2] x86/sev-es: Remove dead code Arvind Sankar
@ 2020-10-05 15:12 ` Arvind Sankar
  2020-11-18 17:18   ` [tip: x86/cleanups] " tip-bot2 for Arvind Sankar
  2020-10-05 15:12 ` [PATCH 2/2] x86/head/64: Remove unused GET_CR2_INTO() macro Arvind Sankar
  1 sibling, 1 reply; 5+ messages in thread
From: Arvind Sankar @ 2020-10-05 15:12 UTC (permalink / raw)
  To: x86, Joerg Roedel; +Cc: linux-kernel

Commit [in tip/master]
  8570978ea030 ("x86/boot/compressed/64: Don't pre-map memory in KASLR code")
removed all the references to finalize_identity_maps(), but neglected to
delete the actual function.

Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
---
 arch/x86/boot/compressed/ident_map_64.c | 10 ----------
 1 file changed, 10 deletions(-)

diff --git a/arch/x86/boot/compressed/ident_map_64.c b/arch/x86/boot/compressed/ident_map_64.c
index 063a60edcf99..be97bf868638 100644
--- a/arch/x86/boot/compressed/ident_map_64.c
+++ b/arch/x86/boot/compressed/ident_map_64.c
@@ -156,16 +156,6 @@ void initialize_identity_maps(void)
 	write_cr3(top_level_pgt);
 }
 
-/*
- * This switches the page tables to the new level4 that has been built
- * via calls to add_identity_map() above. If booted via startup_32(),
- * this is effectively a no-op.
- */
-void finalize_identity_maps(void)
-{
-	write_cr3(top_level_pgt);
-}
-
 static pte_t *split_large_pmd(struct x86_mapping_info *info,
 			      pmd_t *pmdp, unsigned long __address)
 {
-- 
2.26.2


^ permalink raw reply related	[flat|nested] 5+ messages in thread
* [PATCH 2/2] x86/head/64: Remove unused GET_CR2_INTO() macro
  2020-10-05 15:12 [PATCH 0/2] x86/sev-es: Remove dead code Arvind Sankar
  2020-10-05 15:12 ` [PATCH 1/2] x86/boot: Remove unused finalize_identity_maps() Arvind Sankar
@ 2020-10-05 15:12 ` Arvind Sankar
  2020-11-18 17:18   ` [tip: x86/cleanups] " tip-bot2 for Arvind Sankar
  1 sibling, 1 reply; 5+ messages in thread
From: Arvind Sankar @ 2020-10-05 15:12 UTC (permalink / raw)
  To: x86, Joerg Roedel; +Cc: linux-kernel

Commit [in tip/master]
  4b47cdbda6f1 ("x86/head/64: Move early exception dispatch to C code")
removed the usage of GET_CR2_INTO().

Drop the definition as well, and related definitions in paravirt.h and
asm-offsets.h

Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
---
 arch/x86/include/asm/paravirt.h | 11 -----------
 arch/x86/kernel/asm-offsets.c   |  1 -
 arch/x86/kernel/head_64.S       |  9 ---------
 3 files changed, 21 deletions(-)

diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h
index d25cc6830e89..f8dce11d2bc1 100644
--- a/arch/x86/include/asm/paravirt.h
+++ b/arch/x86/include/asm/paravirt.h
@@ -812,17 +812,6 @@ extern void default_banner(void);
 #endif /* CONFIG_PARAVIRT_XXL */
 #endif	/* CONFIG_X86_64 */
 
-#ifdef CONFIG_PARAVIRT_XXL
-
-#define GET_CR2_INTO_AX							\
-	PARA_SITE(PARA_PATCH(PV_MMU_read_cr2),				\
-		  ANNOTATE_RETPOLINE_SAFE;				\
-		  call PARA_INDIRECT(pv_ops+PV_MMU_read_cr2);		\
-		 )
-
-#endif /* CONFIG_PARAVIRT_XXL */
-
-
 #endif /* __ASSEMBLY__ */
 #else  /* CONFIG_PARAVIRT */
 # define default_banner x86_init_noop
diff --git a/arch/x86/kernel/asm-offsets.c b/arch/x86/kernel/asm-offsets.c
index 3ca07ad552ae..74d9b937cf7b 100644
--- a/arch/x86/kernel/asm-offsets.c
+++ b/arch/x86/kernel/asm-offsets.c
@@ -69,7 +69,6 @@ static void __used common(void)
 	OFFSET(PV_IRQ_irq_disable, paravirt_patch_template, irq.irq_disable);
 	OFFSET(PV_IRQ_irq_enable, paravirt_patch_template, irq.irq_enable);
 	OFFSET(PV_CPU_iret, paravirt_patch_template, cpu.iret);
-	OFFSET(PV_MMU_read_cr2, paravirt_patch_template, mmu.read_cr2);
 #endif
 
 #ifdef CONFIG_XEN
diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S
index 7eb2a1c87969..2215d4cff38b 100644
--- a/arch/x86/kernel/head_64.S
+++ b/arch/x86/kernel/head_64.S
@@ -26,15 +26,6 @@
 #include <asm/nospec-branch.h>
 #include <asm/fixmap.h>
 
-#ifdef CONFIG_PARAVIRT_XXL
-#include <asm/asm-offsets.h>
-#include <asm/paravirt.h>
-#define GET_CR2_INTO(reg) GET_CR2_INTO_AX ; _ASM_MOV %_ASM_AX, reg
-#else
-#define INTERRUPT_RETURN iretq
-#define GET_CR2_INTO(reg) _ASM_MOV %cr2, reg
-#endif
-
 /*
  * We are not able to switch in one step to the final KERNEL ADDRESS SPACE
  * because we need identity-mapped pages.
-- 
2.26.2


^ permalink raw reply related	[flat|nested] 5+ messages in thread
* [tip: x86/cleanups] x86/head/64: Remove unused GET_CR2_INTO() macro
  2020-10-05 15:12 ` [PATCH 2/2] x86/head/64: Remove unused GET_CR2_INTO() macro Arvind Sankar
@ 2020-11-18 17:18   ` tip-bot2 for Arvind Sankar
  0 siblings, 0 replies; 5+ messages in thread
From: tip-bot2 for Arvind Sankar @ 2020-11-18 17:18 UTC (permalink / raw)
  To: linux-tip-commits; +Cc: Arvind Sankar, Borislav Petkov, x86, linux-kernel

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

Commit-ID:     31d8546033053b98de00846ede8088bdbe38651d
Gitweb:        https://git.kernel.org/tip/31d8546033053b98de00846ede8088bdbe38651d
Author:        Arvind Sankar <nivedita@alum.mit.edu>
AuthorDate:    Mon, 05 Oct 2020 11:12:08 -04:00
Committer:     Borislav Petkov <bp@suse.de>
CommitterDate: Wed, 18 Nov 2020 18:09:38 +01:00

x86/head/64: Remove unused GET_CR2_INTO() macro

Commit

  4b47cdbda6f1 ("x86/head/64: Move early exception dispatch to C code")

removed the usage of GET_CR2_INTO().

Drop the definition as well, and related definitions in paravirt.h and
asm-offsets.h

Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20201005151208.2212886-3-nivedita@alum.mit.edu
---
 arch/x86/include/asm/paravirt.h | 11 -----------
 arch/x86/kernel/asm-offsets.c   |  1 -
 arch/x86/kernel/head_64.S       |  9 ---------
 3 files changed, 21 deletions(-)

diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h
index d25cc68..f8dce11 100644
--- a/arch/x86/include/asm/paravirt.h
+++ b/arch/x86/include/asm/paravirt.h
@@ -812,17 +812,6 @@ extern void default_banner(void);
 #endif /* CONFIG_PARAVIRT_XXL */
 #endif	/* CONFIG_X86_64 */
 
-#ifdef CONFIG_PARAVIRT_XXL
-
-#define GET_CR2_INTO_AX							\
-	PARA_SITE(PARA_PATCH(PV_MMU_read_cr2),				\
-		  ANNOTATE_RETPOLINE_SAFE;				\
-		  call PARA_INDIRECT(pv_ops+PV_MMU_read_cr2);		\
-		 )
-
-#endif /* CONFIG_PARAVIRT_XXL */
-
-
 #endif /* __ASSEMBLY__ */
 #else  /* CONFIG_PARAVIRT */
 # define default_banner x86_init_noop
diff --git a/arch/x86/kernel/asm-offsets.c b/arch/x86/kernel/asm-offsets.c
index 70b7154..60b9f42 100644
--- a/arch/x86/kernel/asm-offsets.c
+++ b/arch/x86/kernel/asm-offsets.c
@@ -66,7 +66,6 @@ static void __used common(void)
 	OFFSET(PV_IRQ_irq_disable, paravirt_patch_template, irq.irq_disable);
 	OFFSET(PV_IRQ_irq_enable, paravirt_patch_template, irq.irq_enable);
 	OFFSET(PV_CPU_iret, paravirt_patch_template, cpu.iret);
-	OFFSET(PV_MMU_read_cr2, paravirt_patch_template, mmu.read_cr2);
 #endif
 
 #ifdef CONFIG_XEN
diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S
index 7eb2a1c..2215d4c 100644
--- a/arch/x86/kernel/head_64.S
+++ b/arch/x86/kernel/head_64.S
@@ -26,15 +26,6 @@
 #include <asm/nospec-branch.h>
 #include <asm/fixmap.h>
 
-#ifdef CONFIG_PARAVIRT_XXL
-#include <asm/asm-offsets.h>
-#include <asm/paravirt.h>
-#define GET_CR2_INTO(reg) GET_CR2_INTO_AX ; _ASM_MOV %_ASM_AX, reg
-#else
-#define INTERRUPT_RETURN iretq
-#define GET_CR2_INTO(reg) _ASM_MOV %cr2, reg
-#endif
-
 /*
  * We are not able to switch in one step to the final KERNEL ADDRESS SPACE
  * because we need identity-mapped pages.

^ permalink raw reply related	[flat|nested] 5+ messages in thread
* [tip: x86/cleanups] x86/boot: Remove unused finalize_identity_maps()
  2020-10-05 15:12 ` [PATCH 1/2] x86/boot: Remove unused finalize_identity_maps() Arvind Sankar
@ 2020-11-18 17:18   ` tip-bot2 for Arvind Sankar
  0 siblings, 0 replies; 5+ messages in thread
From: tip-bot2 for Arvind Sankar @ 2020-11-18 17:18 UTC (permalink / raw)
  To: linux-tip-commits; +Cc: Arvind Sankar, Borislav Petkov, x86, linux-kernel

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

Commit-ID:     0ac317e89791b76055ef11b952625ef77a1d2eba
Gitweb:        https://git.kernel.org/tip/0ac317e89791b76055ef11b952625ef77a1d2eba
Author:        Arvind Sankar <nivedita@alum.mit.edu>
AuthorDate:    Mon, 05 Oct 2020 11:12:07 -04:00
Committer:     Borislav Petkov <bp@suse.de>
CommitterDate: Wed, 18 Nov 2020 16:04:23 +01:00

x86/boot: Remove unused finalize_identity_maps()

Commit

  8570978ea030 ("x86/boot/compressed/64: Don't pre-map memory in KASLR code")

removed all the references to finalize_identity_maps(), but neglected to
delete the actual function. Remove it.

Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20201005151208.2212886-2-nivedita@alum.mit.edu
---
 arch/x86/boot/compressed/ident_map_64.c | 10 ----------
 1 file changed, 10 deletions(-)

diff --git a/arch/x86/boot/compressed/ident_map_64.c b/arch/x86/boot/compressed/ident_map_64.c
index a5e5db6..6bf2022 100644
--- a/arch/x86/boot/compressed/ident_map_64.c
+++ b/arch/x86/boot/compressed/ident_map_64.c
@@ -167,16 +167,6 @@ void initialize_identity_maps(void *rmode)
 	write_cr3(top_level_pgt);
 }
 
-/*
- * This switches the page tables to the new level4 that has been built
- * via calls to add_identity_map() above. If booted via startup_32(),
- * this is effectively a no-op.
- */
-void finalize_identity_maps(void)
-{
-	write_cr3(top_level_pgt);
-}
-
 static pte_t *split_large_pmd(struct x86_mapping_info *info,
 			      pmd_t *pmdp, unsigned long __address)
 {

^ permalink raw reply related	[flat|nested] 5+ messages in thread
end of thread, other threads:[~2020-11-18 17:18 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-10-05 15:12 [PATCH 0/2] x86/sev-es: Remove dead code Arvind Sankar
2020-10-05 15:12 ` [PATCH 1/2] x86/boot: Remove unused finalize_identity_maps() Arvind Sankar
2020-11-18 17:18   ` [tip: x86/cleanups] " tip-bot2 for Arvind Sankar
2020-10-05 15:12 ` [PATCH 2/2] x86/head/64: Remove unused GET_CR2_INTO() macro Arvind Sankar
2020-11-18 17:18   ` [tip: x86/cleanups] " tip-bot2 for Arvind Sankar

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