diff options
| -rw-r--r-- | arch/arm/include/asm/kvm_mmu.h | 8 | ||||
| -rw-r--r-- | arch/arm/kvm/mmu.c | 43 |
2 files changed, 35 insertions, 16 deletions
diff --git a/arch/arm/include/asm/kvm_mmu.h b/arch/arm/include/asm/kvm_mmu.h index ac784937cc0..3c71a1d4b7a 100644 --- a/arch/arm/include/asm/kvm_mmu.h +++ b/arch/arm/include/asm/kvm_mmu.h @@ -22,6 +22,14 @@ #include <asm/cacheflush.h> #include <asm/pgalloc.h> +/* + * We directly use the kernel VA for the HYP, as we can directly share + * the mapping (HTTBR "covers" TTBR1). + */ +#define HYP_PAGE_OFFSET_MASK (~0UL) +#define HYP_PAGE_OFFSET PAGE_OFFSET +#define KERN_TO_HYP(kva) (kva) + int create_hyp_mappings(void *from, void *to); int create_hyp_io_mappings(void *from, void *to, phys_addr_t); void free_hyp_pmds(void); diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c index 6b4ea185956..ead6b16eeb0 100644 --- a/arch/arm/kvm/mmu.c +++ b/arch/arm/kvm/mmu.c @@ -101,14 +101,15 @@ void free_hyp_pmds(void) mutex_lock(&kvm_hyp_pgd_mutex); for (addr = PAGE_OFFSET; addr != 0; addr += PGDIR_SIZE) { - pgd = hyp_pgd + pgd_index(addr); - pud = pud_offset(pgd, addr); + unsigned long hyp_addr = KERN_TO_HYP(addr); + pgd = hyp_pgd + pgd_index(hyp_addr); + pud = pud_offset(pgd, hyp_addr); if (pud_none(*pud)) continue; BUG_ON(pud_bad(*pud)); - pmd = pmd_offset(pud, addr); + pmd = pmd_offset(pud, hyp_addr); free_ptes(pmd, addr); pmd_free(NULL, pmd); pud_clear(pud); @@ -124,7 +125,9 @@ static void create_hyp_pte_mappings(pmd_t *pmd, unsigned long start, struct page *page; for (addr = start & PAGE_MASK; addr < end; addr += PAGE_SIZE) { - pte = pte_offset_kernel(pmd, addr); + unsigned long hyp_addr = KERN_TO_HYP(addr); + + pte = pte_offset_kernel(pmd, hyp_addr); BUG_ON(!virt_addr_valid(addr)); page = virt_to_page(addr); kvm_set_pte(pte, mk_pte(page, PAGE_HYP)); @@ -139,7 +142,9 @@ static void create_hyp_io_pte_mappings(pmd_t *pmd, unsigned long start, unsigned long addr; for (addr = start & PAGE_MASK; addr < end; addr += PAGE_SIZE) { - pte = pte_offset_kernel(pmd, addr); + unsigned long hyp_addr = KERN_TO_HYP(addr); + + pte = pte_offset_kernel(pmd, hyp_addr); BUG_ON(pfn_valid(*pfn_base)); kvm_set_pte(pte, pfn_pte(*pfn_base, PAGE_HYP_DEVICE)); (*pfn_base)++; @@ -154,12 +159,13 @@ static int create_hyp_pmd_mappings(pud_t *pud, unsigned long start, unsigned long addr, next; for (addr = start; addr < end; addr = next) { - pmd = pmd_offset(pud, addr); + unsigned long hyp_addr = KERN_TO_HYP(addr); + pmd = pmd_offset(pud, hyp_addr); BUG_ON(pmd_sect(*pmd)); if (pmd_none(*pmd)) { - pte = pte_alloc_one_kernel(NULL, addr); + pte = pte_alloc_one_kernel(NULL, hyp_addr); if (!pte) { kvm_err("Cannot allocate Hyp pte\n"); return -ENOMEM; @@ -200,11 +206,12 @@ static int __create_hyp_mappings(void *from, void *to, unsigned long *pfn_base) mutex_lock(&kvm_hyp_pgd_mutex); for (addr = start; addr < end; addr = next) { - pgd = hyp_pgd + pgd_index(addr); - pud = pud_offset(pgd, addr); + unsigned long hyp_addr = KERN_TO_HYP(addr); + pgd = hyp_pgd + pgd_index(hyp_addr); + pud = pud_offset(pgd, hyp_addr); if (pud_none_or_clear_bad(pud)) { - pmd = pmd_alloc_one(NULL, addr); + pmd = pmd_alloc_one(NULL, hyp_addr); if (!pmd) { kvm_err("Cannot allocate Hyp pmd\n"); err = -ENOMEM; @@ -224,12 +231,13 @@ out: } /** - * create_hyp_mappings - map a kernel virtual address range in Hyp mode + * create_hyp_mappings - duplicate a kernel virtual address range in Hyp mode * @from: The virtual kernel start address of the range * @to: The virtual kernel end address of the range (exclusive) * - * The same virtual address as the kernel virtual address is also used in - * Hyp-mode mapping to the same underlying physical pages. + * The same virtual address as the kernel virtual address is also used + * in Hyp-mode mapping (modulo HYP_PAGE_OFFSET) to the same underlying + * physical pages. * * Note: Wrapping around zero in the "to" address is not supported. */ @@ -239,10 +247,13 @@ int create_hyp_mappings(void *from, void *to) } /** - * create_hyp_io_mappings - map a physical IO range in Hyp mode - * @from: The virtual HYP start address of the range - * @to: The virtual HYP end address of the range (exclusive) + * create_hyp_io_mappings - duplicate a kernel IO mapping into Hyp mode + * @from: The kernel start VA of the range + * @to: The kernel end VA of the range (exclusive) * @addr: The physical start address which gets mapped + * + * The resulting HYP VA is the same as the kernel VA, modulo + * HYP_PAGE_OFFSET. */ int create_hyp_io_mappings(void *from, void *to, phys_addr_t addr) { |