From 119e9db233ad0f4cbd4cfb9f9385a7bca378b37d Mon Sep 17 00:00:00 2001 From: Zeng Chi Date: Mon, 21 Sep 2026 18:24:42 +0800 Subject: KVM: Don't pre-reserve xarray entries when storing empty/NULL attributes Skip the xarray reservation loop when clearing all memory attributes, as storing NULL only erases the entry and never needs to allocate, so no reservation (and no cleanup of a failed one) is required in that case. Suggested-by: Sean Christopherson Cc: David Ballesteros Signed-off-by: Zeng Chi Link: https://patch.msgid.link/20260921102442.1232375-1-zeng_chi911@163.com [sean: split to separate patch] Signed-off-by: Sean Christopherson --- .../features/vm/ELF-ASLR/arch-support.txt | 31 ++++++++++++++++++++++ Documentation/features/vm/THP/arch-support.txt | 30 +++++++++++++++++++++ Documentation/features/vm/TLB/arch-support.txt | 30 +++++++++++++++++++++ .../features/vm/huge-vmap/arch-support.txt | 30 +++++++++++++++++++++ .../features/vm/ioremap_prot/arch-support.txt | 30 +++++++++++++++++++++ .../features/vm/pte_special/arch-support.txt | 30 +++++++++++++++++++++ 6 files changed, 181 insertions(+) create mode 100644 Documentation/features/vm/ELF-ASLR/arch-support.txt create mode 100644 Documentation/features/vm/THP/arch-support.txt create mode 100644 Documentation/features/vm/TLB/arch-support.txt create mode 100644 Documentation/features/vm/huge-vmap/arch-support.txt create mode 100644 Documentation/features/vm/ioremap_prot/arch-support.txt create mode 100644 Documentation/features/vm/pte_special/arch-support.txt (limited to 'Documentation/features/vm') diff --git a/Documentation/features/vm/ELF-ASLR/arch-support.txt b/Documentation/features/vm/ELF-ASLR/arch-support.txt new file mode 100644 index 000000000..57406c0d5 --- /dev/null +++ b/Documentation/features/vm/ELF-ASLR/arch-support.txt @@ -0,0 +1,31 @@ +# +# Feature name: ELF-ASLR +# Kconfig: ARCH_HAS_ELF_RANDOMIZE +# Kconfig: ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT +# description: arch randomizes the stack, heap and binary images of ELF binaries +# + ----------------------- + | arch |status| + ----------------------- + | alpha: | TODO | + | arc: | TODO | + | arm: | ok | + | arm64: | ok | + | csky: | ok | + | hexagon: | TODO | + | loongarch: | ok | + | m68k: | TODO | + | microblaze: | TODO | + | mips: | ok | + | nios2: | TODO | + | openrisc: | TODO | + | parisc: | ok | + | powerpc: | ok | + | riscv: | ok | + | s390: | ok | + | sh: | TODO | + | sparc: | TODO | + | um: | TODO | + | x86: | ok | + | xtensa: | TODO | + ----------------------- diff --git a/Documentation/features/vm/THP/arch-support.txt b/Documentation/features/vm/THP/arch-support.txt new file mode 100644 index 000000000..b4a5ce169 --- /dev/null +++ b/Documentation/features/vm/THP/arch-support.txt @@ -0,0 +1,30 @@ +# +# Feature name: THP +# Kconfig: HAVE_ARCH_TRANSPARENT_HUGEPAGE +# description: arch supports transparent hugepages +# + ----------------------- + | arch |status| + ----------------------- + | alpha: | TODO | + | arc: | ok | + | arm: | ok | + | arm64: | ok | + | csky: | .. | + | hexagon: | .. | + | loongarch: | ok | + | m68k: | .. | + | microblaze: | .. | + | mips: | ok | + | nios2: | .. | + | openrisc: | .. | + | parisc: | TODO | + | powerpc: | ok | + | riscv: | ok | + | s390: | ok | + | sh: | .. | + | sparc: | ok | + | um: | .. | + | x86: | ok | + | xtensa: | .. | + ----------------------- diff --git a/Documentation/features/vm/TLB/arch-support.txt b/Documentation/features/vm/TLB/arch-support.txt new file mode 100644 index 000000000..d222bd3ee --- /dev/null +++ b/Documentation/features/vm/TLB/arch-support.txt @@ -0,0 +1,30 @@ +# +# Feature name: batch-unmap-tlb-flush +# Kconfig: ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH +# description: arch supports deferral of TLB flush until multiple pages are unmapped +# + ----------------------- + | arch |status| + ----------------------- + | alpha: | TODO | + | arc: | TODO | + | arm: | TODO | + | arm64: | ok | + | csky: | TODO | + | hexagon: | TODO | + | loongarch: | TODO | + | m68k: | .. | + | microblaze: | .. | + | mips: | TODO | + | nios2: | .. | + | openrisc: | .. | + | parisc: | TODO | + | powerpc: | TODO | + | riscv: | ok | + | s390: | TODO | + | sh: | TODO | + | sparc: | TODO | + | um: | .. | + | x86: | ok | + | xtensa: | TODO | + ----------------------- diff --git a/Documentation/features/vm/huge-vmap/arch-support.txt b/Documentation/features/vm/huge-vmap/arch-support.txt new file mode 100644 index 000000000..2d6de7b04 --- /dev/null +++ b/Documentation/features/vm/huge-vmap/arch-support.txt @@ -0,0 +1,30 @@ +# +# Feature name: huge-vmap +# Kconfig: HAVE_ARCH_HUGE_VMAP +# description: arch supports the arch_vmap_pud_supported() and arch_vmap_pmd_supported() VM APIs +# + ----------------------- + | arch |status| + ----------------------- + | alpha: | TODO | + | arc: | TODO | + | arm: | TODO | + | arm64: | ok | + | csky: | TODO | + | hexagon: | TODO | + | loongarch: | TODO | + | m68k: | TODO | + | microblaze: | TODO | + | mips: | TODO | + | nios2: | TODO | + | openrisc: | TODO | + | parisc: | TODO | + | powerpc: | ok | + | riscv: | ok | + | s390: | TODO | + | sh: | TODO | + | sparc: | TODO | + | um: | TODO | + | x86: | ok | + | xtensa: | TODO | + ----------------------- diff --git a/Documentation/features/vm/ioremap_prot/arch-support.txt b/Documentation/features/vm/ioremap_prot/arch-support.txt new file mode 100644 index 000000000..c0a2d8f56 --- /dev/null +++ b/Documentation/features/vm/ioremap_prot/arch-support.txt @@ -0,0 +1,30 @@ +# +# Feature name: ioremap_prot +# Kconfig: HAVE_IOREMAP_PROT +# description: arch has ioremap_prot() +# + ----------------------- + | arch |status| + ----------------------- + | alpha: | TODO | + | arc: | ok | + | arm: | TODO | + | arm64: | ok | + | csky: | TODO | + | hexagon: | TODO | + | loongarch: | ok | + | m68k: | TODO | + | microblaze: | TODO | + | mips: | ok | + | nios2: | TODO | + | openrisc: | TODO | + | parisc: | TODO | + | powerpc: | ok | + | riscv: | ok | + | s390: | ok | + | sh: | ok | + | sparc: | TODO | + | um: | TODO | + | x86: | ok | + | xtensa: | TODO | + ----------------------- diff --git a/Documentation/features/vm/pte_special/arch-support.txt b/Documentation/features/vm/pte_special/arch-support.txt new file mode 100644 index 000000000..3f777f8b6 --- /dev/null +++ b/Documentation/features/vm/pte_special/arch-support.txt @@ -0,0 +1,30 @@ +# +# Feature name: pte_special +# Kconfig: ARCH_HAS_PTE_SPECIAL +# description: arch supports the pte_special()/pte_mkspecial() VM APIs +# + ----------------------- + | arch |status| + ----------------------- + | alpha: | TODO | + | arc: | ok | + | arm: | ok | + | arm64: | ok | + | csky: | TODO | + | hexagon: | TODO | + | loongarch: | ok | + | m68k: | TODO | + | microblaze: | TODO | + | mips: | ok | + | nios2: | TODO | + | openrisc: | TODO | + | parisc: | ok | + | powerpc: | ok | + | riscv: | ok | + | s390: | ok | + | sh: | ok | + | sparc: | ok | + | um: | TODO | + | x86: | ok | + | xtensa: | TODO | + ----------------------- -- cgit v1.3.1