[tip: x86/paravirt] x86/paravirt: Merge activate_mm() and dup_mmap() callbacks
From: tip-bot2 for Juergen Gross
Date: Mon Mar 06 2023 - 03:58:57 EST
The following commit has been merged into the x86/paravirt branch of tip:
Commit-ID: c9ae1b10d9561012a222e05f0d3ab4e93d301f06
Gitweb: https://git.kernel.org/tip/c9ae1b10d9561012a222e05f0d3ab4e93d301f06
Author: Juergen Gross <jgross@xxxxxxxx>
AuthorDate: Tue, 07 Feb 2023 08:59:02 +01:00
Committer: Borislav Petkov (AMD) <bp@xxxxxxxxx>
CommitterDate: Mon, 06 Mar 2023 09:41:37 +01:00
x86/paravirt: Merge activate_mm() and dup_mmap() callbacks
The two paravirt callbacks .mmu.activate_mm() and .mmu.dup_mmap() are
sharing the same implementations in all cases: for Xen PV guests they
are pinning the PGD of the new mm_struct, and for all other cases they
are a NOP.
In the end, both callbacks are meant to register an address space with
the underlying hypervisor, so there needs to be only a single callback
for that purpose.
So merge them to a common callback .mmu.enter_mmap() (in contrast to the
corresponding already existing .mmu.exit_mmap()).
As the first parameter of the old callbacks isn't used, drop it from the
replacement one.
[ bp: Remove last occurrence of paravirt_activate_mm() in
asm/mmu_context.h ]
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Signed-off-by: Borislav Petkov (AMD) <bp@xxxxxxxxx>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Reviewed-by: Srivatsa S. Bhat (VMware) <srivatsa@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230207075902.7539-1-jgross@xxxxxxxx
---
arch/x86/include/asm/mmu_context.h | 11 ++---------
arch/x86/include/asm/paravirt.h | 14 +++-----------
arch/x86/include/asm/paravirt_types.h | 7 ++-----
arch/x86/kernel/paravirt.c | 3 +--
arch/x86/mm/init.c | 2 +-
arch/x86/xen/mmu_pv.c | 12 ++----------
6 files changed, 11 insertions(+), 38 deletions(-)
diff --git a/arch/x86/include/asm/mmu_context.h b/arch/x86/include/asm/mmu_context.h
index e01aa74..c3ad8a5 100644
--- a/arch/x86/include/asm/mmu_context.h
+++ b/arch/x86/include/asm/mmu_context.h
@@ -16,13 +16,6 @@
extern atomic64_t last_mm_ctx_id;
-#ifndef CONFIG_PARAVIRT_XXL
-static inline void paravirt_activate_mm(struct mm_struct *prev,
- struct mm_struct *next)
-{
-}
-#endif /* !CONFIG_PARAVIRT_XXL */
-
#ifdef CONFIG_PERF_EVENTS
DECLARE_STATIC_KEY_FALSE(rdpmc_never_available_key);
DECLARE_STATIC_KEY_FALSE(rdpmc_always_available_key);
@@ -135,7 +128,7 @@ extern void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next,
#define activate_mm(prev, next) \
do { \
- paravirt_activate_mm((prev), (next)); \
+ paravirt_enter_mmap(next); \
switch_mm((prev), (next), NULL); \
} while (0);
@@ -168,7 +161,7 @@ static inline void arch_dup_pkeys(struct mm_struct *oldmm,
static inline int arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm)
{
arch_dup_pkeys(oldmm, mm);
- paravirt_arch_dup_mmap(oldmm, mm);
+ paravirt_enter_mmap(mm);
return ldt_dup_context(oldmm, mm);
}
diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h
index cf40e81..b497786 100644
--- a/arch/x86/include/asm/paravirt.h
+++ b/arch/x86/include/asm/paravirt.h
@@ -334,16 +334,9 @@ static inline void tss_update_io_bitmap(void)
}
#endif
-static inline void paravirt_activate_mm(struct mm_struct *prev,
- struct mm_struct *next)
+static inline void paravirt_enter_mmap(struct mm_struct *next)
{
- PVOP_VCALL2(mmu.activate_mm, prev, next);
-}
-
-static inline void paravirt_arch_dup_mmap(struct mm_struct *oldmm,
- struct mm_struct *mm)
-{
- PVOP_VCALL2(mmu.dup_mmap, oldmm, mm);
+ PVOP_VCALL1(mmu.enter_mmap, next);
}
static inline int paravirt_pgd_alloc(struct mm_struct *mm)
@@ -789,8 +782,7 @@ extern void default_banner(void);
#ifndef __ASSEMBLY__
#ifndef CONFIG_PARAVIRT_XXL
-static inline void paravirt_arch_dup_mmap(struct mm_struct *oldmm,
- struct mm_struct *mm)
+static inline void paravirt_enter_mmap(struct mm_struct *mm)
{
}
#endif
diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h
index 8c1da41..71bf64b 100644
--- a/arch/x86/include/asm/paravirt_types.h
+++ b/arch/x86/include/asm/paravirt_types.h
@@ -164,11 +164,8 @@ struct pv_mmu_ops {
unsigned long (*read_cr3)(void);
void (*write_cr3)(unsigned long);
- /* Hooks for intercepting the creation/use of an mm_struct. */
- void (*activate_mm)(struct mm_struct *prev,
- struct mm_struct *next);
- void (*dup_mmap)(struct mm_struct *oldmm,
- struct mm_struct *mm);
+ /* Hook for intercepting the creation/use of an mm_struct. */
+ void (*enter_mmap)(struct mm_struct *mm);
/* Hooks for allocating and freeing a pagetable top-level */
int (*pgd_alloc)(struct mm_struct *mm);
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
index 42e1828..0e68a31 100644
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -363,8 +363,7 @@ struct paravirt_patch_template pv_ops = {
.mmu.make_pte = PTE_IDENT,
.mmu.make_pgd = PTE_IDENT,
- .mmu.dup_mmap = paravirt_nop,
- .mmu.activate_mm = paravirt_nop,
+ .mmu.enter_mmap = paravirt_nop,
.mmu.lazy_mode = {
.enter = paravirt_nop,
diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index cb258f5..cbc53da 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -806,7 +806,7 @@ void __init poking_init(void)
BUG_ON(!poking_mm);
/* Xen PV guests need the PGD to be pinned. */
- paravirt_arch_dup_mmap(NULL, poking_mm);
+ paravirt_enter_mmap(poking_mm);
/*
* Randomize the poking address, but make sure that the following page
diff --git a/arch/x86/xen/mmu_pv.c b/arch/x86/xen/mmu_pv.c
index ee29fb5..b3b8d28 100644
--- a/arch/x86/xen/mmu_pv.c
+++ b/arch/x86/xen/mmu_pv.c
@@ -885,14 +885,7 @@ void xen_mm_unpin_all(void)
spin_unlock(&pgd_lock);
}
-static void xen_activate_mm(struct mm_struct *prev, struct mm_struct *next)
-{
- spin_lock(&next->page_table_lock);
- xen_pgd_pin(next);
- spin_unlock(&next->page_table_lock);
-}
-
-static void xen_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm)
+static void xen_enter_mmap(struct mm_struct *mm)
{
spin_lock(&mm->page_table_lock);
xen_pgd_pin(mm);
@@ -2153,8 +2146,7 @@ static const typeof(pv_ops) xen_mmu_ops __initconst = {
.make_p4d = PV_CALLEE_SAVE(xen_make_p4d),
#endif
- .activate_mm = xen_activate_mm,
- .dup_mmap = xen_dup_mmap,
+ .enter_mmap = xen_enter_mmap,
.exit_mmap = xen_exit_mmap,
.lazy_mode = {