diff options
Diffstat (limited to 'arch/arm64/kvm/hyp/pgtable.c')
-rw-r--r-- | arch/arm64/kvm/hyp/pgtable.c | 69 |
1 files changed, 22 insertions, 47 deletions
diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c index 5a59ef88b646..b11bcebac908 100644 --- a/arch/arm64/kvm/hyp/pgtable.c +++ b/arch/arm64/kvm/hyp/pgtable.c @@ -17,48 +17,6 @@ #define KVM_PTE_TYPE_PAGE 1 #define KVM_PTE_TYPE_TABLE 1 -#define KVM_PTE_LEAF_ATTR_LO GENMASK(11, 2) - -#define KVM_PTE_LEAF_ATTR_LO_S1_ATTRIDX GENMASK(4, 2) -#define KVM_PTE_LEAF_ATTR_LO_S1_AP GENMASK(7, 6) -#define KVM_PTE_LEAF_ATTR_LO_S1_AP_RO \ - ({ cpus_have_final_cap(ARM64_KVM_HVHE) ? 2 : 3; }) -#define KVM_PTE_LEAF_ATTR_LO_S1_AP_RW \ - ({ cpus_have_final_cap(ARM64_KVM_HVHE) ? 0 : 1; }) -#define KVM_PTE_LEAF_ATTR_LO_S1_SH GENMASK(9, 8) -#define KVM_PTE_LEAF_ATTR_LO_S1_SH_IS 3 -#define KVM_PTE_LEAF_ATTR_LO_S1_AF BIT(10) - -#define KVM_PTE_LEAF_ATTR_LO_S2_MEMATTR GENMASK(5, 2) -#define KVM_PTE_LEAF_ATTR_LO_S2_S2AP_R BIT(6) -#define KVM_PTE_LEAF_ATTR_LO_S2_S2AP_W BIT(7) -#define KVM_PTE_LEAF_ATTR_LO_S2_SH GENMASK(9, 8) -#define KVM_PTE_LEAF_ATTR_LO_S2_SH_IS 3 -#define KVM_PTE_LEAF_ATTR_LO_S2_AF BIT(10) - -#define KVM_PTE_LEAF_ATTR_HI GENMASK(63, 50) - -#define KVM_PTE_LEAF_ATTR_HI_SW GENMASK(58, 55) - -#define KVM_PTE_LEAF_ATTR_HI_S1_XN BIT(54) - -#define KVM_PTE_LEAF_ATTR_HI_S2_XN BIT(54) - -#define KVM_PTE_LEAF_ATTR_HI_S1_GP BIT(50) - -#define KVM_PTE_LEAF_ATTR_S2_PERMS (KVM_PTE_LEAF_ATTR_LO_S2_S2AP_R | \ - KVM_PTE_LEAF_ATTR_LO_S2_S2AP_W | \ - KVM_PTE_LEAF_ATTR_HI_S2_XN) - -#define KVM_INVALID_PTE_OWNER_MASK GENMASK(9, 2) -#define KVM_MAX_OWNER_ID 1 - -/* - * Used to indicate a pte for which a 'break-before-make' sequence is in - * progress. - */ -#define KVM_INVALID_PTE_LOCKED BIT(10) - struct kvm_pgtable_walk_data { struct kvm_pgtable_walker *walker; @@ -914,12 +872,12 @@ static void stage2_unmap_put_pte(const struct kvm_pgtable_visit_ctx *ctx, static bool stage2_pte_cacheable(struct kvm_pgtable *pgt, kvm_pte_t pte) { u64 memattr = pte & KVM_PTE_LEAF_ATTR_LO_S2_MEMATTR; - return memattr == KVM_S2_MEMATTR(pgt, NORMAL); + return kvm_pte_valid(pte) && memattr == KVM_S2_MEMATTR(pgt, NORMAL); } static bool stage2_pte_executable(kvm_pte_t pte) { - return !(pte & KVM_PTE_LEAF_ATTR_HI_S2_XN); + return kvm_pte_valid(pte) && !(pte & KVM_PTE_LEAF_ATTR_HI_S2_XN); } static u64 stage2_map_walker_phys_addr(const struct kvm_pgtable_visit_ctx *ctx, @@ -979,6 +937,21 @@ static int stage2_map_walker_try_leaf(const struct kvm_pgtable_visit_ctx *ctx, if (!stage2_pte_needs_update(ctx->old, new)) return -EAGAIN; + /* If we're only changing software bits, then store them and go! */ + if (!kvm_pgtable_walk_shared(ctx) && + !((ctx->old ^ new) & ~KVM_PTE_LEAF_ATTR_HI_SW)) { + bool old_is_counted = stage2_pte_is_counted(ctx->old); + + if (old_is_counted != stage2_pte_is_counted(new)) { + if (old_is_counted) + mm_ops->put_page(ctx->ptep); + else + mm_ops->get_page(ctx->ptep); + } + WARN_ON_ONCE(!stage2_try_set_pte(ctx, new)); + return 0; + } + if (!stage2_try_break_pte(ctx, data->mmu)) return -EAGAIN; @@ -1370,7 +1343,7 @@ static int stage2_flush_walker(const struct kvm_pgtable_visit_ctx *ctx, struct kvm_pgtable *pgt = ctx->arg; struct kvm_pgtable_mm_ops *mm_ops = pgt->mm_ops; - if (!kvm_pte_valid(ctx->old) || !stage2_pte_cacheable(pgt, ctx->old)) + if (!stage2_pte_cacheable(pgt, ctx->old)) return 0; if (mm_ops->dcache_clean_inval_poc) @@ -1532,7 +1505,6 @@ static int stage2_split_walker(const struct kvm_pgtable_visit_ctx *ctx, */ new = kvm_init_table_pte(childp, mm_ops); stage2_make_pte(ctx, new); - dsb(ishst); return 0; } @@ -1544,8 +1516,11 @@ int kvm_pgtable_stage2_split(struct kvm_pgtable *pgt, u64 addr, u64 size, .flags = KVM_PGTABLE_WALK_LEAF, .arg = mc, }; + int ret; - return kvm_pgtable_walk(pgt, addr, size, &walker); + ret = kvm_pgtable_walk(pgt, addr, size, &walker); + dsb(ishst); + return ret; } int __kvm_pgtable_stage2_init(struct kvm_pgtable *pgt, struct kvm_s2_mmu *mmu, |