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[Linux-stable-mirror] ARM: dts: omap3: logicpd-torpedo-37xx-devkit: Fix MMC1 cd-gpio

by Adam Ford

Commit b7ace5ed8867 ("ARM: dts: omap3: logicpd-torpedo-37xx-devkit: Fix MMC1 cd-gpio") fixes the card detect gpio detection. Can this patch please be applied to linux-4.4.y and linux-4.9.y? thank you adam

7 years, 2 months

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[Linux-stable-mirror] Patch "x86/mm/pat: Ensure cpa->pfn only contains page frame numbers" has been added to the 4.4-stable tree

by gregkh＠linuxfoundation.org

This is a note to let you know that I've just added the patch titled x86/mm/pat: Ensure cpa->pfn only contains page frame numbers to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… The filename of the patch is: x86-mm-pat-ensure-cpa-pfn-only-contains-page-frame-numbers.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable(a)vger.kernel.org> know about it. >From edc3b9129cecd0f0857112136f5b8b1bc1d45918 Mon Sep 17 00:00:00 2001 From: Matt Fleming <matt(a)codeblueprint.co.uk> Date: Fri, 27 Nov 2015 21:09:31 +0000 Subject: x86/mm/pat: Ensure cpa->pfn only contains page frame numbers From: Matt Fleming <matt(a)codeblueprint.co.uk> commit edc3b9129cecd0f0857112136f5b8b1bc1d45918 upstream. The x86 pageattr code is confused about the data that is stored in cpa->pfn, sometimes it's treated as a page frame number, sometimes it's treated as an unshifted physical address, and in one place it's treated as a pte. The result of this is that the mapping functions do not map the intended physical address. This isn't a problem in practice because most of the addresses we're mapping in the EFI code paths are already mapped in 'trampoline_pgd' and so the pageattr mapping functions don't actually do anything in this case. But when we move to using a separate page table for the EFI runtime this will be an issue. Signed-off-by: Matt Fleming <matt(a)codeblueprint.co.uk> Reviewed-by: Borislav Petkov <bp(a)suse.de> Acked-by: Borislav Petkov <bp(a)suse.de> Cc: Andy Lutomirski <luto(a)amacapital.net> Cc: Ard Biesheuvel <ard.biesheuvel(a)linaro.org> Cc: Borislav Petkov <bp(a)alien8.de> Cc: Brian Gerst <brgerst(a)gmail.com> Cc: Dave Hansen <dave.hansen(a)intel.com> Cc: Denys Vlasenko <dvlasenk(a)redhat.com> Cc: H. Peter Anvin <hpa(a)zytor.com> Cc: Linus Torvalds <torvalds(a)linux-foundation.org> Cc: Peter Zijlstra <peterz(a)infradead.org> Cc: Sai Praneeth Prakhya <sai.praneeth.prakhya(a)intel.com> Cc: Thomas Gleixner <tglx(a)linutronix.de> Cc: Toshi Kani <toshi.kani(a)hp.com> Cc: linux-efi(a)vger.kernel.org Link: http://lkml.kernel.org/r/1448658575-17029-3-git-send-email-matt@codebluepri… Signed-off-by: Ingo Molnar <mingo(a)kernel.org> Cc: "Ghannam, Yazen" <Yazen.Ghannam(a)amd.com> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> --- arch/x86/mm/pageattr.c | 17 ++++++----------- arch/x86/platform/efi/efi_64.c | 16 ++++++++++------ 2 files changed, 16 insertions(+), 17 deletions(-) --- a/arch/x86/mm/pageattr.c +++ b/arch/x86/mm/pageattr.c @@ -911,15 +911,10 @@ static void populate_pte(struct cpa_data pte = pte_offset_kernel(pmd, start); while (num_pages-- && start < end) { - - /* deal with the NX bit */ - if (!(pgprot_val(pgprot) & _PAGE_NX)) - cpa->pfn &= ~_PAGE_NX; - - set_pte(pte, pfn_pte(cpa->pfn >> PAGE_SHIFT, pgprot)); + set_pte(pte, pfn_pte(cpa->pfn, pgprot)); start += PAGE_SIZE; - cpa->pfn += PAGE_SIZE; + cpa->pfn++; pte++; } } @@ -975,11 +970,11 @@ static int populate_pmd(struct cpa_data pmd = pmd_offset(pud, start); - set_pmd(pmd, __pmd(cpa->pfn | _PAGE_PSE | + set_pmd(pmd, __pmd(cpa->pfn << PAGE_SHIFT | _PAGE_PSE | massage_pgprot(pmd_pgprot))); start += PMD_SIZE; - cpa->pfn += PMD_SIZE; + cpa->pfn += PMD_SIZE >> PAGE_SHIFT; cur_pages += PMD_SIZE >> PAGE_SHIFT; } @@ -1048,11 +1043,11 @@ static int populate_pud(struct cpa_data * Map everything starting from the Gb boundary, possibly with 1G pages */ while (end - start >= PUD_SIZE) { - set_pud(pud, __pud(cpa->pfn | _PAGE_PSE | + set_pud(pud, __pud(cpa->pfn << PAGE_SHIFT | _PAGE_PSE | massage_pgprot(pud_pgprot))); start += PUD_SIZE; - cpa->pfn += PUD_SIZE; + cpa->pfn += PUD_SIZE >> PAGE_SHIFT; cur_pages += PUD_SIZE >> PAGE_SHIFT; pud++; } --- a/arch/x86/platform/efi/efi_64.c +++ b/arch/x86/platform/efi/efi_64.c @@ -143,7 +143,7 @@ void efi_sync_low_kernel_mappings(void) int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages) { - unsigned long text; + unsigned long pfn, text; struct page *page; unsigned npages; pgd_t *pgd; @@ -160,7 +160,8 @@ int __init efi_setup_page_tables(unsigne * and ident-map those pages containing the map before calling * phys_efi_set_virtual_address_map(). */ - if (kernel_map_pages_in_pgd(pgd, pa_memmap, pa_memmap, num_pages, _PAGE_NX)) { + pfn = pa_memmap >> PAGE_SHIFT; + if (kernel_map_pages_in_pgd(pgd, pfn, pa_memmap, num_pages, _PAGE_NX)) { pr_err("Error ident-mapping new memmap (0x%lx)!\n", pa_memmap); return 1; } @@ -185,8 +186,9 @@ int __init efi_setup_page_tables(unsigne npages = (_end - _text) >> PAGE_SHIFT; text = __pa(_text); + pfn = text >> PAGE_SHIFT; - if (kernel_map_pages_in_pgd(pgd, text >> PAGE_SHIFT, text, npages, 0)) { + if (kernel_map_pages_in_pgd(pgd, pfn, text, npages, 0)) { pr_err("Failed to map kernel text 1:1\n"); return 1; } @@ -204,12 +206,14 @@ void __init efi_cleanup_page_tables(unsi static void __init __map_region(efi_memory_desc_t *md, u64 va) { pgd_t *pgd = (pgd_t *)__va(real_mode_header->trampoline_pgd); - unsigned long pf = 0; + unsigned long flags = 0; + unsigned long pfn; if (!(md->attribute & EFI_MEMORY_WB)) - pf |= _PAGE_PCD; + flags |= _PAGE_PCD; - if (kernel_map_pages_in_pgd(pgd, md->phys_addr, va, md->num_pages, pf)) + pfn = md->phys_addr >> PAGE_SHIFT; + if (kernel_map_pages_in_pgd(pgd, pfn, va, md->num_pages, flags)) pr_warn("Error mapping PA 0x%llx -> VA 0x%llx!\n", md->phys_addr, va); } Patches currently in stable-queue which might be from matt(a)codeblueprint.co.uk are queue-4.4/x86-mm-pat-ensure-cpa-pfn-only-contains-page-frame-numbers.patch queue-4.4/x86-efi-hoist-page-table-switching-code-into-efi_call_virt.patch queue-4.4/x86-efi-build-our-own-page-table-structures.patch

7 years, 2 months

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[Linux-stable-mirror] Patch "x86/efi: Hoist page table switching code into efi_call_virt()" has been added to the 4.4-stable tree

by gregkh＠linuxfoundation.org

This is a note to let you know that I've just added the patch titled x86/efi: Hoist page table switching code into efi_call_virt() to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… The filename of the patch is: x86-efi-hoist-page-table-switching-code-into-efi_call_virt.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable(a)vger.kernel.org> know about it. >From c9f2a9a65e4855b74d92cdad688f6ee4a1a323ff Mon Sep 17 00:00:00 2001 From: Matt Fleming <matt(a)codeblueprint.co.uk> Date: Fri, 27 Nov 2015 21:09:33 +0000 Subject: x86/efi: Hoist page table switching code into efi_call_virt() From: Matt Fleming <matt(a)codeblueprint.co.uk> commit c9f2a9a65e4855b74d92cdad688f6ee4a1a323ff upstream. This change is a prerequisite for pending patches that switch to a dedicated EFI page table, instead of using 'trampoline_pgd' which shares PGD entries with 'swapper_pg_dir'. The pending patches make it impossible to dereference the runtime service function pointer without first switching %cr3. It's true that we now have duplicated switching code in efi_call_virt() and efi_call_phys_{prolog,epilog}() but we are sacrificing code duplication for a little more clarity and the ease of writing the page table switching code in C instead of asm. Signed-off-by: Matt Fleming <matt(a)codeblueprint.co.uk> Reviewed-by: Borislav Petkov <bp(a)suse.de> Acked-by: Borislav Petkov <bp(a)suse.de> Cc: Andrew Morton <akpm(a)linux-foundation.org> Cc: Andy Lutomirski <luto(a)amacapital.net> Cc: Andy Lutomirski <luto(a)kernel.org> Cc: Ard Biesheuvel <ard.biesheuvel(a)linaro.org> Cc: Borislav Petkov <bp(a)alien8.de> Cc: Brian Gerst <brgerst(a)gmail.com> Cc: Dave Jones <davej(a)codemonkey.org.uk> Cc: Denys Vlasenko <dvlasenk(a)redhat.com> Cc: H. Peter Anvin <hpa(a)zytor.com> Cc: Linus Torvalds <torvalds(a)linux-foundation.org> Cc: Peter Zijlstra <peterz(a)infradead.org> Cc: Sai Praneeth Prakhya <sai.praneeth.prakhya(a)intel.com> Cc: Stephen Smalley <sds(a)tycho.nsa.gov> Cc: Thomas Gleixner <tglx(a)linutronix.de> Cc: Toshi Kani <toshi.kani(a)hp.com> Cc: linux-efi(a)vger.kernel.org Link: http://lkml.kernel.org/r/1448658575-17029-5-git-send-email-matt@codebluepri… Signed-off-by: Ingo Molnar <mingo(a)kernel.org> Cc: "Ghannam, Yazen" <Yazen.Ghannam(a)amd.com> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> --- arch/x86/include/asm/efi.h | 25 ++++++++++++++++++++ arch/x86/platform/efi/efi_64.c | 24 +++++++++----------- arch/x86/platform/efi/efi_stub_64.S | 43 ------------------------------------ 3 files changed, 36 insertions(+), 56 deletions(-) --- a/arch/x86/include/asm/efi.h +++ b/arch/x86/include/asm/efi.h @@ -3,6 +3,7 @@ #include <asm/fpu/api.h> #include <asm/pgtable.h> +#include <asm/tlb.h> /* * We map the EFI regions needed for runtime services non-contiguously, @@ -64,6 +65,17 @@ extern u64 asmlinkage efi_call(void *fp, #define efi_call_phys(f, args...) efi_call((f), args) +/* + * Scratch space used for switching the pagetable in the EFI stub + */ +struct efi_scratch { + u64 r15; + u64 prev_cr3; + pgd_t *efi_pgt; + bool use_pgd; + u64 phys_stack; +} __packed; + #define efi_call_virt(f, ...) \ ({ \ efi_status_t __s; \ @@ -71,7 +83,20 @@ extern u64 asmlinkage efi_call(void *fp, efi_sync_low_kernel_mappings(); \ preempt_disable(); \ __kernel_fpu_begin(); \ + \ + if (efi_scratch.use_pgd) { \ + efi_scratch.prev_cr3 = read_cr3(); \ + write_cr3((unsigned long)efi_scratch.efi_pgt); \ + __flush_tlb_all(); \ + } \ + \ __s = efi_call((void *)efi.systab->runtime->f, __VA_ARGS__); \ + \ + if (efi_scratch.use_pgd) { \ + write_cr3(efi_scratch.prev_cr3); \ + __flush_tlb_all(); \ + } \ + \ __kernel_fpu_end(); \ preempt_enable(); \ __s; \ --- a/arch/x86/platform/efi/efi_64.c +++ b/arch/x86/platform/efi/efi_64.c @@ -47,16 +47,7 @@ */ static u64 efi_va = EFI_VA_START; -/* - * Scratch space used for switching the pagetable in the EFI stub - */ -struct efi_scratch { - u64 r15; - u64 prev_cr3; - pgd_t *efi_pgt; - bool use_pgd; - u64 phys_stack; -} __packed; +struct efi_scratch efi_scratch; static void __init early_code_mapping_set_exec(int executable) { @@ -83,8 +74,11 @@ pgd_t * __init efi_call_phys_prolog(void int pgd; int n_pgds; - if (!efi_enabled(EFI_OLD_MEMMAP)) - return NULL; + if (!efi_enabled(EFI_OLD_MEMMAP)) { + save_pgd = (pgd_t *)read_cr3(); + write_cr3((unsigned long)efi_scratch.efi_pgt); + goto out; + } early_code_mapping_set_exec(1); @@ -96,6 +90,7 @@ pgd_t * __init efi_call_phys_prolog(void vaddress = (unsigned long)__va(pgd * PGDIR_SIZE); set_pgd(pgd_offset_k(pgd * PGDIR_SIZE), *pgd_offset_k(vaddress)); } +out: __flush_tlb_all(); return save_pgd; @@ -109,8 +104,11 @@ void __init efi_call_phys_epilog(pgd_t * int pgd_idx; int nr_pgds; - if (!save_pgd) + if (!efi_enabled(EFI_OLD_MEMMAP)) { + write_cr3((unsigned long)save_pgd); + __flush_tlb_all(); return; + } nr_pgds = DIV_ROUND_UP((max_pfn << PAGE_SHIFT) , PGDIR_SIZE); --- a/arch/x86/platform/efi/efi_stub_64.S +++ b/arch/x86/platform/efi/efi_stub_64.S @@ -38,41 +38,6 @@ mov %rsi, %cr0; \ mov (%rsp), %rsp - /* stolen from gcc */ - .macro FLUSH_TLB_ALL - movq %r15, efi_scratch(%rip) - movq %r14, efi_scratch+8(%rip) - movq %cr4, %r15 - movq %r15, %r14 - andb $0x7f, %r14b - movq %r14, %cr4 - movq %r15, %cr4 - movq efi_scratch+8(%rip), %r14 - movq efi_scratch(%rip), %r15 - .endm - - .macro SWITCH_PGT - cmpb $0, efi_scratch+24(%rip) - je 1f - movq %r15, efi_scratch(%rip) # r15 - # save previous CR3 - movq %cr3, %r15 - movq %r15, efi_scratch+8(%rip) # prev_cr3 - movq efi_scratch+16(%rip), %r15 # EFI pgt - movq %r15, %cr3 - 1: - .endm - - .macro RESTORE_PGT - cmpb $0, efi_scratch+24(%rip) - je 2f - movq efi_scratch+8(%rip), %r15 - movq %r15, %cr3 - movq efi_scratch(%rip), %r15 - FLUSH_TLB_ALL - 2: - .endm - ENTRY(efi_call) SAVE_XMM mov (%rsp), %rax @@ -83,16 +48,8 @@ ENTRY(efi_call) mov %r8, %r9 mov %rcx, %r8 mov %rsi, %rcx - SWITCH_PGT call *%rdi - RESTORE_PGT addq $48, %rsp RESTORE_XMM ret ENDPROC(efi_call) - - .data -ENTRY(efi_scratch) - .fill 3,8,0 - .byte 0 - .quad 0 Patches currently in stable-queue which might be from matt(a)codeblueprint.co.uk are queue-4.4/x86-mm-pat-ensure-cpa-pfn-only-contains-page-frame-numbers.patch queue-4.4/x86-efi-hoist-page-table-switching-code-into-efi_call_virt.patch queue-4.4/x86-efi-build-our-own-page-table-structures.patch

7 years, 2 months

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[Linux-stable-mirror] Patch "x86/efi: Build our own page table structures" has been added to the 4.4-stable tree

by gregkh＠linuxfoundation.org

This is a note to let you know that I've just added the patch titled x86/efi: Build our own page table structures to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… The filename of the patch is: x86-efi-build-our-own-page-table-structures.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable(a)vger.kernel.org> know about it. >From 67a9108ed4313b85a9c53406d80dc1ae3f8c3e36 Mon Sep 17 00:00:00 2001 From: Matt Fleming <matt(a)codeblueprint.co.uk> Date: Fri, 27 Nov 2015 21:09:34 +0000 Subject: x86/efi: Build our own page table structures From: Matt Fleming <matt(a)codeblueprint.co.uk> commit 67a9108ed4313b85a9c53406d80dc1ae3f8c3e36 upstream. With commit e1a58320a38d ("x86/mm: Warn on W^X mappings") all users booting on 64-bit UEFI machines see the following warning, ------------[ cut here ]------------ WARNING: CPU: 7 PID: 1 at arch/x86/mm/dump_pagetables.c:225 note_page+0x5dc/0x780() x86/mm: Found insecure W+X mapping at address ffff88000005f000/0xffff88000005f000 ... x86/mm: Checked W+X mappings: FAILED, 165660 W+X pages found. ... This is caused by mapping EFI regions with RWX permissions. There isn't much we can do to restrict the permissions for these regions due to the way the firmware toolchains mix code and data, but we can at least isolate these mappings so that they do not appear in the regular kernel page tables. In commit d2f7cbe7b26a ("x86/efi: Runtime services virtual mapping") we started using 'trampoline_pgd' to map the EFI regions because there was an existing identity mapping there which we use during the SetVirtualAddressMap() call and for broken firmware that accesses those addresses. But 'trampoline_pgd' shares some PGD entries with 'swapper_pg_dir' and does not provide the isolation we require. Notably the virtual address for __START_KERNEL_map and MODULES_START are mapped by the same PGD entry so we need to be more careful when copying changes over in efi_sync_low_kernel_mappings(). This patch doesn't go the full mile, we still want to share some PGD entries with 'swapper_pg_dir'. Having completely separate page tables brings its own issues such as synchronising new mappings after memory hotplug and module loading. Sharing also keeps memory usage down. Signed-off-by: Matt Fleming <matt(a)codeblueprint.co.uk> Reviewed-by: Borislav Petkov <bp(a)suse.de> Acked-by: Borislav Petkov <bp(a)suse.de> Cc: Andrew Morton <akpm(a)linux-foundation.org> Cc: Andy Lutomirski <luto(a)amacapital.net> Cc: Andy Lutomirski <luto(a)kernel.org> Cc: Ard Biesheuvel <ard.biesheuvel(a)linaro.org> Cc: Borislav Petkov <bp(a)alien8.de> Cc: Brian Gerst <brgerst(a)gmail.com> Cc: Dave Jones <davej(a)codemonkey.org.uk> Cc: Denys Vlasenko <dvlasenk(a)redhat.com> Cc: H. Peter Anvin <hpa(a)zytor.com> Cc: Linus Torvalds <torvalds(a)linux-foundation.org> Cc: Peter Zijlstra <peterz(a)infradead.org> Cc: Sai Praneeth Prakhya <sai.praneeth.prakhya(a)intel.com> Cc: Stephen Smalley <sds(a)tycho.nsa.gov> Cc: Thomas Gleixner <tglx(a)linutronix.de> Cc: Toshi Kani <toshi.kani(a)hp.com> Cc: linux-efi(a)vger.kernel.org Link: http://lkml.kernel.org/r/1448658575-17029-6-git-send-email-matt@codebluepri… Signed-off-by: Ingo Molnar <mingo(a)kernel.org> Cc: "Ghannam, Yazen" <Yazen.Ghannam(a)amd.com> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> --- arch/x86/include/asm/efi.h | 1 arch/x86/platform/efi/efi.c | 39 +++++----------- arch/x86/platform/efi/efi_32.c | 5 ++ arch/x86/platform/efi/efi_64.c | 97 ++++++++++++++++++++++++++++++++++------- 4 files changed, 102 insertions(+), 40 deletions(-) --- a/arch/x86/include/asm/efi.h +++ b/arch/x86/include/asm/efi.h @@ -136,6 +136,7 @@ extern void __init efi_memory_uc(u64 add extern void __init efi_map_region(efi_memory_desc_t *md); extern void __init efi_map_region_fixed(efi_memory_desc_t *md); extern void efi_sync_low_kernel_mappings(void); +extern int __init efi_alloc_page_tables(void); extern int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages); extern void __init efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages); extern void __init old_map_region(efi_memory_desc_t *md); --- a/arch/x86/platform/efi/efi.c +++ b/arch/x86/platform/efi/efi.c @@ -869,7 +869,7 @@ static void __init kexec_enter_virtual_m * This function will switch the EFI runtime services to virtual mode. * Essentially, we look through the EFI memmap and map every region that * has the runtime attribute bit set in its memory descriptor into the - * ->trampoline_pgd page table using a top-down VA allocation scheme. + * efi_pgd page table. * * The old method which used to update that memory descriptor with the * virtual address obtained from ioremap() is still supported when the @@ -879,8 +879,8 @@ static void __init kexec_enter_virtual_m * * The new method does a pagetable switch in a preemption-safe manner * so that we're in a different address space when calling a runtime - * function. For function arguments passing we do copy the PGDs of the - * kernel page table into ->trampoline_pgd prior to each call. + * function. For function arguments passing we do copy the PUDs of the + * kernel page table into efi_pgd prior to each call. * * Specially for kexec boot, efi runtime maps in previous kernel should * be passed in via setup_data. In that case runtime ranges will be mapped @@ -895,6 +895,12 @@ static void __init __efi_enter_virtual_m efi.systab = NULL; + if (efi_alloc_page_tables()) { + pr_err("Failed to allocate EFI page tables\n"); + clear_bit(EFI_RUNTIME_SERVICES, &efi.flags); + return; + } + efi_merge_regions(); new_memmap = efi_map_regions(&count, &pg_shift); if (!new_memmap) { @@ -954,28 +960,11 @@ static void __init __efi_enter_virtual_m efi_runtime_mkexec(); /* - * We mapped the descriptor array into the EFI pagetable above but we're - * not unmapping it here. Here's why: - * - * We're copying select PGDs from the kernel page table to the EFI page - * table and when we do so and make changes to those PGDs like unmapping - * stuff from them, those changes appear in the kernel page table and we - * go boom. - * - * From setup_real_mode(): - * - * ... - * trampoline_pgd[0] = init_level4_pgt[pgd_index(__PAGE_OFFSET)].pgd; - * - * In this particular case, our allocation is in PGD 0 of the EFI page - * table but we've copied that PGD from PGD[272] of the EFI page table: - * - * pgd_index(__PAGE_OFFSET = 0xffff880000000000) = 272 - * - * where the direct memory mapping in kernel space is. - * - * new_memmap's VA comes from that direct mapping and thus clearing it, - * it would get cleared in the kernel page table too. + * We mapped the descriptor array into the EFI pagetable above + * but we're not unmapping it here because if we're running in + * EFI mixed mode we need all of memory to be accessible when + * we pass parameters to the EFI runtime services in the + * thunking code. * * efi_cleanup_page_tables(__pa(new_memmap), 1 << pg_shift); */ --- a/arch/x86/platform/efi/efi_32.c +++ b/arch/x86/platform/efi/efi_32.c @@ -38,6 +38,11 @@ * say 0 - 3G. */ +int __init efi_alloc_page_tables(void) +{ + return 0; +} + void efi_sync_low_kernel_mappings(void) {} void __init efi_dump_pagetable(void) {} int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages) --- a/arch/x86/platform/efi/efi_64.c +++ b/arch/x86/platform/efi/efi_64.c @@ -40,6 +40,7 @@ #include <asm/fixmap.h> #include <asm/realmode.h> #include <asm/time.h> +#include <asm/pgalloc.h> /* * We allocate runtime services regions bottom-up, starting from -4G, i.e. @@ -121,22 +122,92 @@ void __init efi_call_phys_epilog(pgd_t * early_code_mapping_set_exec(0); } +static pgd_t *efi_pgd; + +/* + * We need our own copy of the higher levels of the page tables + * because we want to avoid inserting EFI region mappings (EFI_VA_END + * to EFI_VA_START) into the standard kernel page tables. Everything + * else can be shared, see efi_sync_low_kernel_mappings(). + */ +int __init efi_alloc_page_tables(void) +{ + pgd_t *pgd; + pud_t *pud; + gfp_t gfp_mask; + + if (efi_enabled(EFI_OLD_MEMMAP)) + return 0; + + gfp_mask = GFP_KERNEL | __GFP_NOTRACK | __GFP_REPEAT | __GFP_ZERO; + efi_pgd = (pgd_t *)__get_free_page(gfp_mask); + if (!efi_pgd) + return -ENOMEM; + + pgd = efi_pgd + pgd_index(EFI_VA_END); + + pud = pud_alloc_one(NULL, 0); + if (!pud) { + free_page((unsigned long)efi_pgd); + return -ENOMEM; + } + + pgd_populate(NULL, pgd, pud); + + return 0; +} + /* * Add low kernel mappings for passing arguments to EFI functions. */ void efi_sync_low_kernel_mappings(void) { - unsigned num_pgds; - pgd_t *pgd = (pgd_t *)__va(real_mode_header->trampoline_pgd); + unsigned num_entries; + pgd_t *pgd_k, *pgd_efi; + pud_t *pud_k, *pud_efi; if (efi_enabled(EFI_OLD_MEMMAP)) return; - num_pgds = pgd_index(MODULES_END - 1) - pgd_index(PAGE_OFFSET); + /* + * We can share all PGD entries apart from the one entry that + * covers the EFI runtime mapping space. + * + * Make sure the EFI runtime region mappings are guaranteed to + * only span a single PGD entry and that the entry also maps + * other important kernel regions. + */ + BUILD_BUG_ON(pgd_index(EFI_VA_END) != pgd_index(MODULES_END)); + BUILD_BUG_ON((EFI_VA_START & PGDIR_MASK) != + (EFI_VA_END & PGDIR_MASK)); + + pgd_efi = efi_pgd + pgd_index(PAGE_OFFSET); + pgd_k = pgd_offset_k(PAGE_OFFSET); + + num_entries = pgd_index(EFI_VA_END) - pgd_index(PAGE_OFFSET); + memcpy(pgd_efi, pgd_k, sizeof(pgd_t) * num_entries); + + /* + * We share all the PUD entries apart from those that map the + * EFI regions. Copy around them. + */ + BUILD_BUG_ON((EFI_VA_START & ~PUD_MASK) != 0); + BUILD_BUG_ON((EFI_VA_END & ~PUD_MASK) != 0); + + pgd_efi = efi_pgd + pgd_index(EFI_VA_END); + pud_efi = pud_offset(pgd_efi, 0); + + pgd_k = pgd_offset_k(EFI_VA_END); + pud_k = pud_offset(pgd_k, 0); + + num_entries = pud_index(EFI_VA_END); + memcpy(pud_efi, pud_k, sizeof(pud_t) * num_entries); - memcpy(pgd + pgd_index(PAGE_OFFSET), - init_mm.pgd + pgd_index(PAGE_OFFSET), - sizeof(pgd_t) * num_pgds); + pud_efi = pud_offset(pgd_efi, EFI_VA_START); + pud_k = pud_offset(pgd_k, EFI_VA_START); + + num_entries = PTRS_PER_PUD - pud_index(EFI_VA_START); + memcpy(pud_efi, pud_k, sizeof(pud_t) * num_entries); } int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages) @@ -149,8 +220,8 @@ int __init efi_setup_page_tables(unsigne if (efi_enabled(EFI_OLD_MEMMAP)) return 0; - efi_scratch.efi_pgt = (pgd_t *)(unsigned long)real_mode_header->trampoline_pgd; - pgd = __va(efi_scratch.efi_pgt); + efi_scratch.efi_pgt = (pgd_t *)__pa(efi_pgd); + pgd = efi_pgd; /* * It can happen that the physical address of new_memmap lands in memory @@ -196,16 +267,14 @@ int __init efi_setup_page_tables(unsigne void __init efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages) { - pgd_t *pgd = (pgd_t *)__va(real_mode_header->trampoline_pgd); - - kernel_unmap_pages_in_pgd(pgd, pa_memmap, num_pages); + kernel_unmap_pages_in_pgd(efi_pgd, pa_memmap, num_pages); } static void __init __map_region(efi_memory_desc_t *md, u64 va) { - pgd_t *pgd = (pgd_t *)__va(real_mode_header->trampoline_pgd); unsigned long flags = 0; unsigned long pfn; + pgd_t *pgd = efi_pgd; if (!(md->attribute & EFI_MEMORY_WB)) flags |= _PAGE_PCD; @@ -314,9 +383,7 @@ void __init efi_runtime_mkexec(void) void __init efi_dump_pagetable(void) { #ifdef CONFIG_EFI_PGT_DUMP - pgd_t *pgd = (pgd_t *)__va(real_mode_header->trampoline_pgd); - - ptdump_walk_pgd_level(NULL, pgd); + ptdump_walk_pgd_level(NULL, efi_pgd); #endif } Patches currently in stable-queue which might be from matt(a)codeblueprint.co.uk are queue-4.4/x86-mm-pat-ensure-cpa-pfn-only-contains-page-frame-numbers.patch queue-4.4/x86-efi-hoist-page-table-switching-code-into-efi_call_virt.patch queue-4.4/x86-efi-build-our-own-page-table-structures.patch

7 years, 2 months

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[Linux-stable-mirror] ARM: dts: LogicPD Torpedo: Fix camera pin mux

by Adam Ford

Commit 56322e123235 ("ARM: dts: LogicPD Torpedo: Fix camera pin mux") fixes some pin muxing issues which causes distortion in the camera. Can this patch please be ported to linux-4.9.y? adam

7 years, 2 months

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[Linux-stable-mirror] Essential get_user fix missing from 3.10 aarch64

by Jason A. Donenfeld

Hi stable/arm/Willy, 1f65c13efef69b6dc908e588f91a133641d8475c is an important commit, because it involves evaluation of pointers from userspace. I'm running into issues with RNDADDTOENTCNT reading bogus values, because p is incremented twice as much as it should in this random.c block: case RNDADDENTROPY: if (!capable(CAP_SYS_ADMIN)) return -EPERM; if (get_user(ent_count, p++)) return -EFAULT; if (ent_count < 0) return -EINVAL; if (get_user(size, p++)) return -EFAULT; retval = write_pool(&input_pool, (const char __user *)p, size); That seems reasonable, but on aarch64, get_user is defined as: #define get_user(x, ptr) \ ({ \ might_sleep(); \ access_ok(VERIFY_READ, (ptr), sizeof(*(ptr))) ? \ __get_user((x), (ptr)) : \ ((x) = 0, -EFAULT); \ }) Notice the multiple use of ptr. I thought I had found something breathtakingly bad, until I realized that it was already fixed in 2013 by Takahiro. It just wasn't marked for stable. Not sure if there's ever going to be another stable 3.10 release, but if so, this would be an important one to backport. Regards, Jason

7 years, 2 months

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[Linux-stable-mirror] [PATCH RT 02/15] Revert "fs: jbd2: pull your plug when waiting for space"

by Steven Rostedt

4.9.65-rt57-rc1 stable review patch. If anyone has any objections, please let me know. ------------------ From: Sebastian Andrzej Siewior <bigeasy(a)linutronix.de> This reverts commit "fs: jbd2: pull your plug when waiting for space". This was a duct-tape fix which shouldn't be needed since commit "locking/rt-mutex: fix deadlock in device mapper / block-IO". Cc: stable(a)vger.kernel.org Signed-off-by: Sebastian Andrzej Siewior <bigeasy(a)linutronix.de> Signed-off-by: Steven Rostedt (VMware) <rostedt(a)goodmis.org> --- fs/jbd2/checkpoint.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/fs/jbd2/checkpoint.c b/fs/jbd2/checkpoint.c index 6e18a06aaabe..684996c8a3a4 100644 --- a/fs/jbd2/checkpoint.c +++ b/fs/jbd2/checkpoint.c @@ -116,8 +116,6 @@ void __jbd2_log_wait_for_space(journal_t *journal) nblocks = jbd2_space_needed(journal); while (jbd2_log_space_left(journal) < nblocks) { write_unlock(&journal->j_state_lock); - if (current->plug) - io_schedule(); mutex_lock(&journal->j_checkpoint_mutex); /* -- 2.13.2

7 years, 2 months

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[Linux-stable-mirror] [PATCH RT 01/15] Revert "memcontrol: Prevent scheduling while atomic in cgroup code"

by Steven Rostedt

4.9.65-rt57-rc1 stable review patch. If anyone has any objections, please let me know. ------------------ From: "Steven Rostedt (VMware)" <rostedt(a)goodmis.org> The commit "memcontrol: Prevent scheduling while atomic in cgroup code" fixed this issue: refill_stock() get_cpu_var() drain_stock() res_counter_uncharge() res_counter_uncharge_until() spin_lock() <== boom But commit 3e32cb2e0a12b ("mm: memcontrol: lockless page counters") replaced the calls to res_counter_uncharge() in drain_stock() to the lockless function page_counter_uncharge(). There is no more spin lock there and no more reason to have that local lock. Cc: <stable(a)vger.kernel.org> Reported-by: Haiyang HY1 Tan <tanhy1(a)lenovo.com> Signed-off-by: Steven Rostedt (VMware) <rostedt(a)goodmis.org> [bigeasy: That upstream commit appeared in v3.19 and the patch in question in v3.18.7-rt2 and v3.18 seems still to be maintained. So I guess that v3.18 would need the locallocks that we are about to remove here. I am not sure if any earlier versions have the patch backported. The stable tag here is because Haiyang reported (and debugged) a crash in 4.4-RT with this patch applied (which has get_cpu_light() instead the locallocks it gained in v4.9-RT). https://lkml.kernel.org/r/05AA4EC5C6EC1D48BE2CDCFF3AE0B8A637F78A15@CNMAILEX… ] Signed-off-by: Sebastian Andrzej Siewior <bigeasy(a)linutronix.de> --- mm/memcontrol.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 12b94909ba7b..c04403033aec 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -1698,7 +1698,6 @@ struct memcg_stock_pcp { #define FLUSHING_CACHED_CHARGE 0 }; static DEFINE_PER_CPU(struct memcg_stock_pcp, memcg_stock); -static DEFINE_LOCAL_IRQ_LOCK(memcg_stock_ll); static DEFINE_MUTEX(percpu_charge_mutex); /** @@ -1721,7 +1720,7 @@ static bool consume_stock(struct mem_cgroup *memcg, unsigned int nr_pages) if (nr_pages > CHARGE_BATCH) return ret; - local_lock_irqsave(memcg_stock_ll, flags); + local_irq_save(flags); stock = this_cpu_ptr(&memcg_stock); if (memcg == stock->cached && stock->nr_pages >= nr_pages) { @@ -1729,7 +1728,7 @@ static bool consume_stock(struct mem_cgroup *memcg, unsigned int nr_pages) ret = true; } - local_unlock_irqrestore(memcg_stock_ll, flags); + local_irq_restore(flags); return ret; } @@ -1756,13 +1755,13 @@ static void drain_local_stock(struct work_struct *dummy) struct memcg_stock_pcp *stock; unsigned long flags; - local_lock_irqsave(memcg_stock_ll, flags); + local_irq_save(flags); stock = this_cpu_ptr(&memcg_stock); drain_stock(stock); clear_bit(FLUSHING_CACHED_CHARGE, &stock->flags); - local_unlock_irqrestore(memcg_stock_ll, flags); + local_irq_restore(flags); } /* @@ -1774,7 +1773,7 @@ static void refill_stock(struct mem_cgroup *memcg, unsigned int nr_pages) struct memcg_stock_pcp *stock; unsigned long flags; - local_lock_irqsave(memcg_stock_ll, flags); + local_irq_save(flags); stock = this_cpu_ptr(&memcg_stock); if (stock->cached != memcg) { /* reset if necessary */ @@ -1783,7 +1782,7 @@ static void refill_stock(struct mem_cgroup *memcg, unsigned int nr_pages) } stock->nr_pages += nr_pages; - local_unlock_irqrestore(memcg_stock_ll, flags); + local_irq_restore(flags); } /* -- 2.13.2

7 years, 2 months

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[Linux-stable-mirror] [PATCH RT 02/15] Revert "fs: jbd2: pull your plug when waiting for space"

by Steven Rostedt

4.9.65-rt57-rc1 stable review patch. If anyone has any objections, please let me know. ------------------ From: Sebastian Andrzej Siewior <bigeasy(a)linutronix.de> This reverts commit "fs: jbd2: pull your plug when waiting for space". This was a duct-tape fix which shouldn't be needed since commit "locking/rt-mutex: fix deadlock in device mapper / block-IO". Cc: stable(a)vger.kernel.org Signed-off-by: Sebastian Andrzej Siewior <bigeasy(a)linutronix.de> Signed-off-by: Steven Rostedt (VMware) <rostedt(a)goodmis.org> --- fs/jbd2/checkpoint.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/fs/jbd2/checkpoint.c b/fs/jbd2/checkpoint.c index 6e18a06aaabe..684996c8a3a4 100644 --- a/fs/jbd2/checkpoint.c +++ b/fs/jbd2/checkpoint.c @@ -116,8 +116,6 @@ void __jbd2_log_wait_for_space(journal_t *journal) nblocks = jbd2_space_needed(journal); while (jbd2_log_space_left(journal) < nblocks) { write_unlock(&journal->j_state_lock); - if (current->plug) - io_schedule(); mutex_lock(&journal->j_checkpoint_mutex); /* -- 2.13.2

7 years, 2 months

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[Linux-stable-mirror] [PATCH RT 01/15] Revert "memcontrol: Prevent scheduling while atomic in cgroup code"

by Steven Rostedt

4.9.65-rt57-rc1 stable review patch. If anyone has any objections, please let me know. ------------------ From: "Steven Rostedt (VMware)" <rostedt(a)goodmis.org> The commit "memcontrol: Prevent scheduling while atomic in cgroup code" fixed this issue: refill_stock() get_cpu_var() drain_stock() res_counter_uncharge() res_counter_uncharge_until() spin_lock() <== boom But commit 3e32cb2e0a12b ("mm: memcontrol: lockless page counters") replaced the calls to res_counter_uncharge() in drain_stock() to the lockless function page_counter_uncharge(). There is no more spin lock there and no more reason to have that local lock. Cc: <stable(a)vger.kernel.org> Reported-by: Haiyang HY1 Tan <tanhy1(a)lenovo.com> Signed-off-by: Steven Rostedt (VMware) <rostedt(a)goodmis.org> [bigeasy: That upstream commit appeared in v3.19 and the patch in question in v3.18.7-rt2 and v3.18 seems still to be maintained. So I guess that v3.18 would need the locallocks that we are about to remove here. I am not sure if any earlier versions have the patch backported. The stable tag here is because Haiyang reported (and debugged) a crash in 4.4-RT with this patch applied (which has get_cpu_light() instead the locallocks it gained in v4.9-RT). https://lkml.kernel.org/r/05AA4EC5C6EC1D48BE2CDCFF3AE0B8A637F78A15@CNMAILEX… ] Signed-off-by: Sebastian Andrzej Siewior <bigeasy(a)linutronix.de> --- mm/memcontrol.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 12b94909ba7b..c04403033aec 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -1698,7 +1698,6 @@ struct memcg_stock_pcp { #define FLUSHING_CACHED_CHARGE 0 }; static DEFINE_PER_CPU(struct memcg_stock_pcp, memcg_stock); -static DEFINE_LOCAL_IRQ_LOCK(memcg_stock_ll); static DEFINE_MUTEX(percpu_charge_mutex); /** @@ -1721,7 +1720,7 @@ static bool consume_stock(struct mem_cgroup *memcg, unsigned int nr_pages) if (nr_pages > CHARGE_BATCH) return ret; - local_lock_irqsave(memcg_stock_ll, flags); + local_irq_save(flags); stock = this_cpu_ptr(&memcg_stock); if (memcg == stock->cached && stock->nr_pages >= nr_pages) { @@ -1729,7 +1728,7 @@ static bool consume_stock(struct mem_cgroup *memcg, unsigned int nr_pages) ret = true; } - local_unlock_irqrestore(memcg_stock_ll, flags); + local_irq_restore(flags); return ret; } @@ -1756,13 +1755,13 @@ static void drain_local_stock(struct work_struct *dummy) struct memcg_stock_pcp *stock; unsigned long flags; - local_lock_irqsave(memcg_stock_ll, flags); + local_irq_save(flags); stock = this_cpu_ptr(&memcg_stock); drain_stock(stock); clear_bit(FLUSHING_CACHED_CHARGE, &stock->flags); - local_unlock_irqrestore(memcg_stock_ll, flags); + local_irq_restore(flags); } /* @@ -1774,7 +1773,7 @@ static void refill_stock(struct mem_cgroup *memcg, unsigned int nr_pages) struct memcg_stock_pcp *stock; unsigned long flags; - local_lock_irqsave(memcg_stock_ll, flags); + local_irq_save(flags); stock = this_cpu_ptr(&memcg_stock); if (stock->cached != memcg) { /* reset if necessary */ @@ -1783,7 +1782,7 @@ static void refill_stock(struct mem_cgroup *memcg, unsigned int nr_pages) } stock->nr_pages += nr_pages; - local_unlock_irqrestore(memcg_stock_ll, flags); + local_irq_restore(flags); } /* -- 2.13.2

7 years, 2 months

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