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Re: [PATCH v1 3/4] sparc/mm: Avoid calling arch_enter/leave_lazy_mmu() in set_ptes
- To: Ryan Roberts <ryan.roberts@xxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, "David S. Miller" <davem@xxxxxxxxxxxxx>, Andreas Larsson <andreas@xxxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>, Catalin Marinas <catalin.marinas@xxxxxxx>
- From: David Hildenbrand <david@xxxxxxxxxx>
- Date: Mon, 3 Mar 2025 09:52:03 +0100
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- Cc: linux-mm@xxxxxxxxx, sparclinux@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
- Delivery-date: Mon, 03 Mar 2025 08:52:14 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 02.03.25 15:55, Ryan Roberts wrote:
With commit 1a10a44dfc1d ("sparc64: implement the new page table range
API") set_ptes was added to the sparc architecture. The implementation
included calling arch_enter/leave_lazy_mmu() calls.
The patch removes the usage of arch_enter/leave_lazy_mmu() since this
implies nesting of lazy mmu regions which is not supported. Without this
fix, lazy mmu mode is effectively disabled because we exit the mode
after the first set_ptes:
remap_pte_range()
-> arch_enter_lazy_mmu()
-> set_ptes()
-> arch_enter_lazy_mmu()
-> arch_leave_lazy_mmu()
-> arch_leave_lazy_mmu()
Powerpc suffered the same problem and fixed it in a corresponding way
with commit 47b8def9358c ("powerpc/mm: Avoid calling
arch_enter/leave_lazy_mmu() in set_ptes").
Fixes: 1a10a44dfc1d ("sparc64: implement the new page table range API")
Signed-off-by: Ryan Roberts <ryan.roberts@xxxxxxx>
---
arch/sparc/include/asm/pgtable_64.h | 2 --
1 file changed, 2 deletions(-)
diff --git a/arch/sparc/include/asm/pgtable_64.h
b/arch/sparc/include/asm/pgtable_64.h
index 2b7f358762c1..dc28f2c4eee3 100644
--- a/arch/sparc/include/asm/pgtable_64.h
+++ b/arch/sparc/include/asm/pgtable_64.h
@@ -936,7 +936,6 @@ static inline void __set_pte_at(struct mm_struct *mm,
unsigned long addr,
static inline void set_ptes(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t pte, unsigned int nr)
{
- arch_enter_lazy_mmu_mode();
for (;;) {
__set_pte_at(mm, addr, ptep, pte, 0);
if (--nr == 0)
@@ -945,7 +944,6 @@ static inline void set_ptes(struct mm_struct *mm, unsigned
long addr,
pte_val(pte) += PAGE_SIZE;
addr += PAGE_SIZE;
}
- arch_leave_lazy_mmu_mode();
}
#define set_ptes set_ptes
Acked-by: David Hildenbrand <david@xxxxxxxxxx>
--
Cheers,
David / dhildenb
|
