diff options
Diffstat (limited to 'arch/arm/include/asm/kvm_mmu.h')
| -rw-r--r-- | arch/arm/include/asm/kvm_mmu.h | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/arch/arm/include/asm/kvm_mmu.h b/arch/arm/include/asm/kvm_mmu.h index 421a20b3487..970f3b5fa10 100644 --- a/arch/arm/include/asm/kvm_mmu.h +++ b/arch/arm/include/asm/kvm_mmu.h @@ -19,6 +19,18 @@ #ifndef __ARM_KVM_MMU_H__ #define __ARM_KVM_MMU_H__ +#include <asm/cacheflush.h> +#include <asm/pgalloc.h> +#include <asm/idmap.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); @@ -36,6 +48,16 @@ phys_addr_t kvm_mmu_get_httbr(void); int kvm_mmu_init(void); void kvm_clear_hyp_idmap(void); +static inline void kvm_set_pte(pte_t *pte, pte_t new_pte) +{ + pte_val(*pte) = new_pte; + /* + * flush_pmd_entry just takes a void pointer and cleans the necessary + * cache entries, so we can reuse the function for ptes. + */ + flush_pmd_entry(pte); +} + static inline bool kvm_is_write_fault(unsigned long hsr) { unsigned long hsr_ec = hsr >> HSR_EC_SHIFT; @@ -47,4 +69,49 @@ static inline bool kvm_is_write_fault(unsigned long hsr) return true; } +static inline void kvm_clean_pgd(pgd_t *pgd) +{ + clean_dcache_area(pgd, PTRS_PER_S2_PGD * sizeof(pgd_t)); +} + +static inline void kvm_clean_pmd_entry(pmd_t *pmd) +{ + clean_pmd_entry(pmd); +} + +static inline void kvm_clean_pte(pte_t *pte) +{ + clean_pte_table(pte); +} + +static inline void kvm_set_s2pte_writable(pte_t *pte) +{ + pte_val(*pte) |= L_PTE_S2_RDWR; +} + +struct kvm; + +static inline void coherent_icache_guest_page(struct kvm *kvm, gfn_t gfn) +{ + /* + * If we are going to insert an instruction page and the icache is + * either VIPT or PIPT, there is a potential problem where the host + * (or another VM) may have used the same page as this guest, and we + * read incorrect data from the icache. If we're using a PIPT cache, + * we can invalidate just that page, but if we are using a VIPT cache + * we need to invalidate the entire icache - damn shame - as written + * in the ARM ARM (DDI 0406C.b - Page B3-1393). + * + * VIVT caches are tagged using both the ASID and the VMID and doesn't + * need any kind of flushing (DDI 0406C.b - Page B3-1392). + */ + if (icache_is_pipt()) { + unsigned long hva = gfn_to_hva(kvm, gfn); + __cpuc_coherent_user_range(hva, hva + PAGE_SIZE); + } else if (!icache_is_vivt_asid_tagged()) { + /* any kind of VIPT cache */ + __flush_icache_all(); + } +} + #endif /* __ARM_KVM_MMU_H__ */ |