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 --- arch/mips/power/Makefile | 2 ++ arch/mips/power/cpu.c | 43 +++++++++++++++++++++++++++++ arch/mips/power/hibernate.c | 12 +++++++++ arch/mips/power/hibernate_asm.S | 60 +++++++++++++++++++++++++++++++++++++++++ 4 files changed, 117 insertions(+) create mode 100644 arch/mips/power/Makefile create mode 100644 arch/mips/power/cpu.c create mode 100644 arch/mips/power/hibernate.c create mode 100644 arch/mips/power/hibernate_asm.S (limited to 'arch/mips/power') diff --git a/arch/mips/power/Makefile b/arch/mips/power/Makefile new file mode 100644 index 000000000..14b7d9ee6 --- /dev/null +++ b/arch/mips/power/Makefile @@ -0,0 +1,2 @@ +# SPDX-License-Identifier: GPL-2.0-only +obj-$(CONFIG_HIBERNATION) += cpu.o hibernate.o hibernate_asm.o diff --git a/arch/mips/power/cpu.c b/arch/mips/power/cpu.c new file mode 100644 index 000000000..d8ef7778e --- /dev/null +++ b/arch/mips/power/cpu.c @@ -0,0 +1,43 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Suspend support specific for mips. + * + * Copyright (C) 2009 Lemote Inc. + * Author: Hu Hongbing + * Wu Zhangjin + */ +#include +#include +#include +#include + +static u32 saved_status; +struct pt_regs saved_regs; + +void save_processor_state(void) +{ + saved_status = read_c0_status(); + + if (is_fpu_owner()) + save_fp(current); + + save_dsp(current); +} + +void restore_processor_state(void) +{ + write_c0_status(saved_status); + + if (is_fpu_owner()) + restore_fp(current); + + restore_dsp(current); +} + +int pfn_is_nosave(unsigned long pfn) +{ + unsigned long nosave_begin_pfn = PFN_DOWN(__pa(&__nosave_begin)); + unsigned long nosave_end_pfn = PFN_UP(__pa(&__nosave_end)); + + return (pfn >= nosave_begin_pfn) && (pfn < nosave_end_pfn); +} diff --git a/arch/mips/power/hibernate.c b/arch/mips/power/hibernate.c new file mode 100644 index 000000000..192879e76 --- /dev/null +++ b/arch/mips/power/hibernate.c @@ -0,0 +1,12 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include + +extern int restore_image(void); + +int swsusp_arch_resume(void) +{ + /* Avoid TLB mismatch during and after kernel resume */ + local_flush_tlb_all(); + return restore_image(); +} diff --git a/arch/mips/power/hibernate_asm.S b/arch/mips/power/hibernate_asm.S new file mode 100644 index 000000000..e62538734 --- /dev/null +++ b/arch/mips/power/hibernate_asm.S @@ -0,0 +1,60 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Hibernation support specific for mips - temporary page tables + * + * Copyright (C) 2009 Lemote Inc. + * Author: Hu Hongbing + * Wu Zhangjin + */ +#include +#include +#include + +.text +LEAF(swsusp_arch_suspend) + PTR_LA t0, saved_regs + PTR_S ra, PT_R31(t0) + PTR_S sp, PT_R29(t0) + PTR_S fp, PT_R30(t0) + PTR_S gp, PT_R28(t0) + PTR_S s0, PT_R16(t0) + PTR_S s1, PT_R17(t0) + PTR_S s2, PT_R18(t0) + PTR_S s3, PT_R19(t0) + PTR_S s4, PT_R20(t0) + PTR_S s5, PT_R21(t0) + PTR_S s6, PT_R22(t0) + PTR_S s7, PT_R23(t0) + j swsusp_save +END(swsusp_arch_suspend) + +LEAF(restore_image) + PTR_L t0, restore_pblist +0: + PTR_L t1, PBE_ADDRESS(t0) /* source */ + PTR_L t2, PBE_ORIG_ADDRESS(t0) /* destination */ + PTR_ADDU t3, t1, _PAGE_SIZE +1: + REG_L t8, (t1) + REG_S t8, (t2) + PTR_ADDIU t1, t1, SZREG + PTR_ADDIU t2, t2, SZREG + bne t1, t3, 1b + PTR_L t0, PBE_NEXT(t0) + bnez t0, 0b + PTR_LA t0, saved_regs + PTR_L ra, PT_R31(t0) + PTR_L sp, PT_R29(t0) + PTR_L fp, PT_R30(t0) + PTR_L gp, PT_R28(t0) + PTR_L s0, PT_R16(t0) + PTR_L s1, PT_R17(t0) + PTR_L s2, PT_R18(t0) + PTR_L s3, PT_R19(t0) + PTR_L s4, PT_R20(t0) + PTR_L s5, PT_R21(t0) + PTR_L s6, PT_R22(t0) + PTR_L s7, PT_R23(t0) + PTR_LI v0, 0x0 + jr ra +END(restore_image) -- cgit v1.3.1