diff options
| -rw-r--r-- | arch/x86/include/asm/kexec.h | 27 | ||||
| -rw-r--r-- | arch/x86/kernel/machine_kexec_64.c | 82 | ||||
| -rw-r--r-- | arch/x86/kernel/relocate_kernel_64.S | 125 |
3 files changed, 67 insertions, 167 deletions
diff --git a/arch/x86/include/asm/kexec.h b/arch/x86/include/asm/kexec.h index c61d8b2ab8b..0ceb6d19ed3 100644 --- a/arch/x86/include/asm/kexec.h +++ b/arch/x86/include/asm/kexec.h @@ -9,23 +9,8 @@ # define PAGES_NR 4 #else # define PA_CONTROL_PAGE 0 -# define VA_CONTROL_PAGE 1 -# define PA_PGD 2 -# define VA_PGD 3 -# define PA_PUD_0 4 -# define VA_PUD_0 5 -# define PA_PMD_0 6 -# define VA_PMD_0 7 -# define PA_PTE_0 8 -# define VA_PTE_0 9 -# define PA_PUD_1 10 -# define VA_PUD_1 11 -# define PA_PMD_1 12 -# define VA_PMD_1 13 -# define PA_PTE_1 14 -# define VA_PTE_1 15 -# define PA_TABLE_PAGE 16 -# define PAGES_NR 17 +# define PA_TABLE_PAGE 1 +# define PAGES_NR 2 #endif #ifdef CONFIG_X86_32 @@ -157,9 +142,9 @@ relocate_kernel(unsigned long indirection_page, unsigned long start_address) ATTRIB_NORET; #endif -#ifdef CONFIG_X86_32 #define ARCH_HAS_KIMAGE_ARCH +#ifdef CONFIG_X86_32 struct kimage_arch { pgd_t *pgd; #ifdef CONFIG_X86_PAE @@ -169,6 +154,12 @@ struct kimage_arch { pte_t *pte0; pte_t *pte1; }; +#else +struct kimage_arch { + pud_t *pud; + pmd_t *pmd; + pte_t *pte; +}; #endif #endif /* __ASSEMBLY__ */ diff --git a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c index c43caa3a91f..6993d51b7fd 100644 --- a/arch/x86/kernel/machine_kexec_64.c +++ b/arch/x86/kernel/machine_kexec_64.c @@ -18,15 +18,6 @@ #include <asm/mmu_context.h> #include <asm/io.h> -#define PAGE_ALIGNED __attribute__ ((__aligned__(PAGE_SIZE))) -static u64 kexec_pgd[512] PAGE_ALIGNED; -static u64 kexec_pud0[512] PAGE_ALIGNED; -static u64 kexec_pmd0[512] PAGE_ALIGNED; -static u64 kexec_pte0[512] PAGE_ALIGNED; -static u64 kexec_pud1[512] PAGE_ALIGNED; -static u64 kexec_pmd1[512] PAGE_ALIGNED; -static u64 kexec_pte1[512] PAGE_ALIGNED; - static void init_level2_page(pmd_t *level2p, unsigned long addr) { unsigned long end_addr; @@ -107,12 +98,65 @@ out: return result; } +static void free_transition_pgtable(struct kimage *image) +{ + free_page((unsigned long)image->arch.pud); + free_page((unsigned long)image->arch.pmd); + free_page((unsigned long)image->arch.pte); +} + +static int init_transition_pgtable(struct kimage *image, pgd_t *pgd) +{ + pud_t *pud; + pmd_t *pmd; + pte_t *pte; + unsigned long vaddr, paddr; + int result = -ENOMEM; + + vaddr = (unsigned long)relocate_kernel; + paddr = __pa(page_address(image->control_code_page)+PAGE_SIZE); + pgd += pgd_index(vaddr); + if (!pgd_present(*pgd)) { + pud = (pud_t *)get_zeroed_page(GFP_KERNEL); + if (!pud) + goto err; + image->arch.pud = pud; + set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE)); + } + pud = pud_offset(pgd, vaddr); + if (!pud_present(*pud)) { + pmd = (pmd_t *)get_zeroed_page(GFP_KERNEL); + if (!pmd) + goto err; + image->arch.pmd = pmd; + set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE)); + } + pmd = pmd_offset(pud, vaddr); + if (!pmd_present(*pmd)) { + pte = (pte_t *)get_zeroed_page(GFP_KERNEL); + if (!pte) + goto err; + image->arch.pte = pte; + set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE)); + } + pte = pte_offset_kernel(pmd, vaddr); + set_pte(pte, pfn_pte(paddr >> PAGE_SHIFT, PAGE_KERNEL_EXEC)); + return 0; +err: + free_transition_pgtable(image); + return result; +} + static int init_pgtable(struct kimage *image, unsigned long start_pgtable) { pgd_t *level4p; + int result; level4p = (pgd_t *)__va(start_pgtable); - return init_level4_page(image, level4p, 0, max_pfn << PAGE_SHIFT); + result = init_level4_page(image, level4p, 0, max_pfn << PAGE_SHIFT); + if (result) + return result; + return init_transition_pgtable(image, level4p); } static void set_idt(void *newidt, u16 limit) @@ -174,7 +218,7 @@ int machine_kexec_prepare(struct kimage *image) void machine_kexec_cleanup(struct kimage *image) { - return; + free_transition_pgtable(image); } /* @@ -195,22 +239,6 @@ void machine_kexec(struct kimage *image) memcpy(control_page, relocate_kernel, PAGE_SIZE); page_list[PA_CONTROL_PAGE] = virt_to_phys(control_page); - page_list[VA_CONTROL_PAGE] = (unsigned long)relocate_kernel; - page_list[PA_PGD] = virt_to_phys(&kexec_pgd); - page_list[VA_PGD] = (unsigned long)kexec_pgd; - page_list[PA_PUD_0] = virt_to_phys(&kexec_pud0); - page_list[VA_PUD_0] = (unsigned long)kexec_pud0; - page_list[PA_PMD_0] = virt_to_phys(&kexec_pmd0); - page_list[VA_PMD_0] = (unsigned long)kexec_pmd0; - page_list[PA_PTE_0] = virt_to_phys(&kexec_pte0); - page_list[VA_PTE_0] = (unsigned long)kexec_pte0; - page_list[PA_PUD_1] = virt_to_phys(&kexec_pud1); - page_list[VA_PUD_1] = (unsigned long)kexec_pud1; - page_list[PA_PMD_1] = virt_to_phys(&kexec_pmd1); - page_list[VA_PMD_1] = (unsigned long)kexec_pmd1; - page_list[PA_PTE_1] = virt_to_phys(&kexec_pte1); - page_list[VA_PTE_1] = (unsigned long)kexec_pte1; - page_list[PA_TABLE_PAGE] = (unsigned long)__pa(page_address(image->control_code_page)); diff --git a/arch/x86/kernel/relocate_kernel_64.S b/arch/x86/kernel/relocate_kernel_64.S index f5afe665a82..b0bbdd4829c 100644 --- a/arch/x86/kernel/relocate_kernel_64.S +++ b/arch/x86/kernel/relocate_kernel_64.S @@ -29,122 +29,6 @@ relocate_kernel: * %rdx start address */ - /* map the control page at its virtual address */ - - movq $0x0000ff8000000000, %r10 /* mask */ - mov $(39 - 3), %cl /* bits to shift */ - movq PTR(VA_CONTROL_PAGE)(%rsi), %r11 /* address to map */ - - movq %r11, %r9 - andq %r10, %r9 - shrq %cl, %r9 - - movq PTR(VA_PGD)(%rsi), %r8 - addq %r8, %r9 - movq PTR(PA_PUD_0)(%rsi), %r8 - orq $PAGE_ATTR, %r8 - movq %r8, (%r9) - - shrq $9, %r10 - sub $9, %cl - - movq %r11, %r9 - andq %r10, %r9 - shrq %cl, %r9 - - movq PTR(VA_PUD_0)(%rsi), %r8 - addq %r8, %r9 - movq PTR(PA_PMD_0)(%rsi), %r8 - orq $PAGE_ATTR, %r8 - movq %r8, (%r9) - - shrq $9, %r10 - sub $9, %cl - - movq %r11, %r9 - andq %r10, %r9 - shrq %cl, %r9 - - movq PTR(VA_PMD_0)(%rsi), %r8 - addq %r8, %r9 - movq PTR(PA_PTE_0)(%rsi), %r8 - orq $PAGE_ATTR, %r8 - movq %r8, (%r9) - - shrq $9, %r10 - sub $9, %cl - - movq %r11, %r9 - andq %r10, %r9 - shrq %cl, %r9 - - movq PTR(VA_PTE_0)(%rsi), %r8 - addq %r8, %r9 - movq PTR(PA_CONTROL_PAGE)(%rsi), %r8 - orq $PAGE_ATTR, %r8 - movq %r8, (%r9) - - /* identity map the control page at its physical address */ - - movq $0x0000ff8000000000, %r10 /* mask */ - mov $(39 - 3), %cl /* bits to shift */ - movq PTR(PA_CONTROL_PAGE)(%rsi), %r11 /* address to map */ - - movq %r11, %r9 - andq %r10, %r9 - shrq %cl, %r9 - - movq PTR(VA_PGD)(%rsi), %r8 - addq %r8, %r9 - movq PTR(PA_PUD_1)(%rsi), %r8 - orq $PAGE_ATTR, %r8 - movq %r8, (%r9) - - shrq $9, %r10 - sub $9, %cl - - movq %r11, %r9 - andq %r10, %r9 - shrq %cl, %r9 - - movq PTR(VA_PUD_1)(%rsi), %r8 - addq %r8, %r9 - movq PTR(PA_PMD_1)(%rsi), %r8 - orq $PAGE_ATTR, %r8 - movq %r8, (%r9) - - shrq $9, %r10 - sub $9, %cl - - movq %r11, %r9 - andq %r10, %r9 - shrq %cl, %r9 - - movq PTR(VA_PMD_1)(%rsi), %r8 - addq %r8, %r9 - movq PTR(PA_PTE_1)(%rsi), %r8 - orq $PAGE_ATTR, %r8 - movq %r8, (%r9) - - shrq $9, %r10 - sub $9, %cl - - movq %r11, %r9 - andq %r10, %r9 - shrq %cl, %r9 - - movq PTR(VA_PTE_1)(%rsi), %r8 - addq %r8, %r9 - movq PTR(PA_CONTROL_PAGE)(%rsi), %r8 - orq $PAGE_ATTR, %r8 - movq %r8, (%r9) - -relocate_new_kernel: - /* %rdi indirection_page - * %rsi page_list - * %rdx start address - */ - /* zero out flags, and disable interrupts */ pushq $0 popfq @@ -156,9 +40,8 @@ relocate_new_kernel: /* get physical address of page table now too */ movq PTR(PA_TABLE_PAGE)(%rsi), %rcx - /* switch to new set of page tables */ - movq PTR(PA_PGD)(%rsi), %r9 - movq %r9, %cr3 + /* Switch to the identity mapped page tables */ + movq %rcx, %cr3 /* setup a new stack at the end of the physical control page */ lea PAGE_SIZE(%r8), %rsp @@ -194,9 +77,7 @@ identity_mapped: jmp 1f 1: - /* Switch to the identity mapped page tables, - * and flush the TLB. - */ + /* Flush the TLB (needed?) */ movq %rcx, %cr3 /* Do the copies */ |