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Fri, 2 Aug 2019 07:48:09 +0000 From: Anup Patel To: Palmer Dabbelt , Paul Walmsley , Paolo Bonzini , Radim K Subject: [RFC PATCH v2 12/19] RISC-V: KVM: Implement stage2 page table programming Thread-Topic: [RFC PATCH v2 12/19] RISC-V: KVM: Implement stage2 page table programming Thread-Index: AQHVSQagyZMEH2oG5USv0u30rcwsuA== Date: Fri, 2 Aug 2019 07:48:09 +0000 Message-ID: <20190802074620.115029-13-anup.patel@wdc.com> References: <20190802074620.115029-1-anup.patel@wdc.com> In-Reply-To: <20190802074620.115029-1-anup.patel@wdc.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: PN1PR01CA0111.INDPRD01.PROD.OUTLOOK.COM (2603:1096:c00::27) To MN2PR04MB6061.namprd04.prod.outlook.com (2603:10b6:208:d8::15) authentication-results: spf=none (sender IP is ) smtp.mailfrom=Anup.Patel@wdc.com; x-ms-exchange-messagesentrepresentingtype: 1 x-mailer: git-send-email 2.17.1 x-originating-ip: [106.51.20.161] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 03eb5545-ca18-43a0-44b6-08d7171dc300 x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: BCL:0; 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At high-level, the flow of stage2 related functions is similar from KVM ARM/ARM64 implementation but the stage2 page table format is quite different for KVM RISC-V. Signed-off-by: Anup Patel --- arch/riscv/include/asm/kvm_host.h | 10 + arch/riscv/include/asm/pgtable-bits.h | 1 + arch/riscv/kvm/mmu.c | 636 +++++++++++++++++++++++++- 3 files changed, 637 insertions(+), 10 deletions(-) diff --git a/arch/riscv/include/asm/kvm_host.h b/arch/riscv/include/asm/kvm_host.h index ca2b4f2b558c..a13531d151e0 100644 --- a/arch/riscv/include/asm/kvm_host.h +++ b/arch/riscv/include/asm/kvm_host.h @@ -68,6 +68,13 @@ struct kvm_mmio_decode { int shift; }; +#define KVM_MMU_PAGE_CACHE_NR_OBJS 32 + +struct kvm_mmu_page_cache { + int nobjs; + void *objects[KVM_MMU_PAGE_CACHE_NR_OBJS]; +}; + struct kvm_cpu_context { unsigned long zero; unsigned long ra; @@ -151,6 +158,9 @@ struct kvm_vcpu_arch { /* MMIO instruction details */ struct kvm_mmio_decode mmio_decode; + /* Cache pages needed to program page tables with spinlock held */ + struct kvm_mmu_page_cache mmu_page_cache; + /* VCPU power-off state */ bool power_off; diff --git a/arch/riscv/include/asm/pgtable-bits.h b/arch/riscv/include/asm/pgtable-bits.h index bbaeb5d35842..be49d62fcc2b 100644 --- a/arch/riscv/include/asm/pgtable-bits.h +++ b/arch/riscv/include/asm/pgtable-bits.h @@ -26,6 +26,7 @@ #define _PAGE_SPECIAL _PAGE_SOFT #define _PAGE_TABLE _PAGE_PRESENT +#define _PAGE_LEAF (_PAGE_READ | _PAGE_WRITE | _PAGE_EXEC) /* * _PAGE_PROT_NONE is set on not-present pages (and ignored by the hardware) to diff --git a/arch/riscv/kvm/mmu.c b/arch/riscv/kvm/mmu.c index 2b965f9aac07..4e3dfa86b867 100644 --- a/arch/riscv/kvm/mmu.c +++ b/arch/riscv/kvm/mmu.c @@ -18,6 +18,432 @@ #include #include +#ifdef CONFIG_64BIT +#define stage2_have_pmd true +#define stage2_gpa_size ((phys_addr_t)(1ULL << 39)) +#define stage2_cache_min_pages 2 +#else +#define pmd_index(x) 0 +#define pfn_pmd(x, y) ({ pmd_t __x = { 0 }; __x; }) +#define stage2_have_pmd false +#define stage2_gpa_size ((phys_addr_t)(1ULL << 32)) +#define stage2_cache_min_pages 1 +#endif + +static int stage2_cache_topup(struct kvm_mmu_page_cache *pcache, + int min, int max) +{ + void *page; + + BUG_ON(max > KVM_MMU_PAGE_CACHE_NR_OBJS); + if (pcache->nobjs >= min) + return 0; + while (pcache->nobjs < max) { + page = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO); + if (!page) + return -ENOMEM; + pcache->objects[pcache->nobjs++] = page; + } + + return 0; +} + +static void stage2_cache_flush(struct kvm_mmu_page_cache *pcache) +{ + while (pcache && pcache->nobjs) + free_page((unsigned long)pcache->objects[--pcache->nobjs]); +} + +static void *stage2_cache_alloc(struct kvm_mmu_page_cache *pcache) +{ + void *p; + + if (!pcache) + return NULL; + + BUG_ON(!pcache->nobjs); + p = pcache->objects[--pcache->nobjs]; + + return p; +} + +struct local_guest_tlb_info { + struct kvm_vmid *vmid; + gpa_t addr; +}; + +static void local_guest_tlb_flush_vmid_gpa(void *info) +{ + struct local_guest_tlb_info *infop = info; + + __kvm_riscv_hfence_gvma_vmid_gpa(READ_ONCE(infop->vmid->vmid_version), + infop->addr); +} + +static void stage2_remote_tlb_flush(struct kvm *kvm, gpa_t addr) +{ + struct local_guest_tlb_info info; + struct kvm_vmid *vmid = &kvm->arch.vmid; + + /* TODO: This should be SBI call */ + info.vmid = vmid; + info.addr = addr; + preempt_disable(); + smp_call_function_many(cpu_all_mask, local_guest_tlb_flush_vmid_gpa, + &info, true); + preempt_enable(); +} + +static int stage2_set_pgd(struct kvm *kvm, gpa_t addr, const pgd_t *new_pgd) +{ + pgd_t *pgdp = &kvm->arch.pgd[pgd_index(addr)]; + + *pgdp = *new_pgd; + if (pgd_val(*pgdp) & _PAGE_LEAF) + stage2_remote_tlb_flush(kvm, addr); + + return 0; +} + +static int stage2_set_pmd(struct kvm *kvm, struct kvm_mmu_page_cache *pcache, + gpa_t addr, const pmd_t *new_pmd) +{ + int rc; + pmd_t *pmdp; + pgd_t new_pgd; + pgd_t *pgdp = &kvm->arch.pgd[pgd_index(addr)]; + + if (!pgd_val(*pgdp)) { + pmdp = stage2_cache_alloc(pcache); + if (!pmdp) + return -ENOMEM; + new_pgd = pfn_pgd(PFN_DOWN(__pa(pmdp)), __pgprot(_PAGE_TABLE)); + rc = stage2_set_pgd(kvm, addr, &new_pgd); + if (rc) + return rc; + } + + if (pgd_val(*pgdp) & _PAGE_LEAF) + return -EEXIST; + + pmdp = (void *)pgd_page_vaddr(*pgdp); + pmdp = &pmdp[pmd_index(addr)]; + + *pmdp = *new_pmd; + if (pmd_val(*pmdp) & _PAGE_LEAF) + stage2_remote_tlb_flush(kvm, addr); + + return 0; +} + +static int stage2_set_pte(struct kvm *kvm, + struct kvm_mmu_page_cache *pcache, + gpa_t addr, const pte_t *new_pte) +{ + int rc; + pte_t *ptep; + pmd_t new_pmd; + pmd_t *pmdp; + pgd_t new_pgd; + pgd_t *pgdp = &kvm->arch.pgd[pgd_index(addr)]; + + if (!pgd_val(*pgdp)) { + pmdp = stage2_cache_alloc(pcache); + if (!pmdp) + return -ENOMEM; + new_pgd = pfn_pgd(PFN_DOWN(__pa(pmdp)), __pgprot(_PAGE_TABLE)); + rc = stage2_set_pgd(kvm, addr, &new_pgd); + if (rc) + return rc; + } + + if (pgd_val(*pgdp) & _PAGE_LEAF) + return -EEXIST; + + if (stage2_have_pmd) { + pmdp = (void *)pgd_page_vaddr(*pgdp); + pmdp = &pmdp[pmd_index(addr)]; + if (!pmd_present(*pmdp)) { + ptep = stage2_cache_alloc(pcache); + if (!ptep) + return -ENOMEM; + new_pmd = pfn_pmd(PFN_DOWN(__pa(ptep)), + __pgprot(_PAGE_TABLE)); + rc = stage2_set_pmd(kvm, pcache, addr, &new_pmd); + if (rc) + return rc; + } + + if (pmd_val(*pmdp) & _PAGE_LEAF) + return -EEXIST; + + ptep = (void *)pmd_page_vaddr(*pmdp); + } else { + ptep = (void *)pgd_page_vaddr(*pgdp); + } + + ptep = &ptep[pte_index(addr)]; + + *ptep = *new_pte; + if (pte_val(*ptep) & _PAGE_LEAF) + stage2_remote_tlb_flush(kvm, addr); + + return 0; +} + +static int stage2_map_page(struct kvm *kvm, + struct kvm_mmu_page_cache *pcache, + gpa_t gpa, phys_addr_t hpa, + unsigned long page_size, pgprot_t prot) +{ + pte_t new_pte; + pmd_t new_pmd; + pgd_t new_pgd; + + if (page_size == PAGE_SIZE) { + new_pte = pfn_pte(PFN_DOWN(hpa), prot); + return stage2_set_pte(kvm, pcache, gpa, &new_pte); + } + + if (stage2_have_pmd && page_size == PMD_SIZE) { + new_pmd = pfn_pmd(PFN_DOWN(hpa), prot); + return stage2_set_pmd(kvm, pcache, gpa, &new_pmd); + } + + if (page_size == PGDIR_SIZE) { + new_pgd = pfn_pgd(PFN_DOWN(hpa), prot); + return stage2_set_pgd(kvm, gpa, &new_pgd); + } + + return -EINVAL; +} + +enum stage2_op { + STAGE2_OP_NOP = 0, /* Nothing */ + STAGE2_OP_CLEAR, /* Clear/Unmap */ + STAGE2_OP_WP, /* Write-protect */ +}; + +static void stage2_op_pte(struct kvm *kvm, gpa_t addr, pte_t *ptep, + enum stage2_op op) +{ + BUG_ON(addr & (PAGE_SIZE - 1)); + + if (!pte_present(*ptep)) + return; + + if (op == STAGE2_OP_CLEAR) + set_pte(ptep, __pte(0)); + else if (op == STAGE2_OP_WP) + set_pte(ptep, __pte(pte_val(*ptep) & ~_PAGE_WRITE)); + stage2_remote_tlb_flush(kvm, addr); +} + +static void stage2_op_pmd(struct kvm *kvm, gpa_t addr, pmd_t *pmdp, + enum stage2_op op) +{ + int i; + pte_t *ptep; + + BUG_ON(addr & (PMD_SIZE - 1)); + + if (!pmd_present(*pmdp)) + return; + + if (pmd_val(*pmdp) & _PAGE_LEAF) + ptep = NULL; + else + ptep = (pte_t *)pmd_page_vaddr(*pmdp); + + if (op == STAGE2_OP_CLEAR) + set_pmd(pmdp, __pmd(0)); + + if (ptep) { + for (i = 0; i < PTRS_PER_PTE; i++) + stage2_op_pte(kvm, addr + i * PAGE_SIZE, &ptep[i], op); + if (op == STAGE2_OP_CLEAR) + put_page(virt_to_page(ptep)); + } else { + if (op == STAGE2_OP_WP) + set_pmd(pmdp, __pmd(pmd_val(*pmdp) & ~_PAGE_WRITE)); + stage2_remote_tlb_flush(kvm, addr); + } +} + +static void stage2_op_pgd(struct kvm *kvm, gpa_t addr, pgd_t *pgdp, + enum stage2_op op) +{ + int i; + pte_t *ptep; + pmd_t *pmdp; + + BUG_ON(addr & (PGDIR_SIZE - 1)); + + if (!pgd_val(*pgdp)) + return; + + ptep = NULL; + pmdp = NULL; + if (!(pgd_val(*pgdp) & _PAGE_LEAF)) { + if (stage2_have_pmd) + pmdp = (pmd_t *)pgd_page_vaddr(*pgdp); + else + ptep = (pte_t *)pgd_page_vaddr(*pgdp); + } + + if (op == STAGE2_OP_CLEAR) + set_pgd(pgdp, __pgd(0)); + + if (pmdp) { + for (i = 0; i < PTRS_PER_PMD; i++) + stage2_op_pmd(kvm, addr + i * PMD_SIZE, &pmdp[i], op); + if (op == STAGE2_OP_CLEAR) + put_page(virt_to_page(pmdp)); + } else if (ptep) { + for (i = 0; i < PTRS_PER_PTE; i++) + stage2_op_pte(kvm, addr + i * PAGE_SIZE, &ptep[i], op); + if (op == STAGE2_OP_CLEAR) + put_page(virt_to_page(ptep)); + } else { + if (op == STAGE2_OP_WP) + set_pgd(pgdp, __pgd(pgd_val(*pgdp) & ~_PAGE_WRITE)); + stage2_remote_tlb_flush(kvm, addr); + } +} + +static void stage2_unmap_range(struct kvm *kvm, gpa_t start, gpa_t size) +{ + pmd_t *pmdp; + pte_t *ptep; + pgd_t *pgdp; + gpa_t addr = start, end = start + size; + + while (addr < end) { + pgdp = &kvm->arch.pgd[pgd_index(addr)]; + if (!pgd_val(*pgdp)) { + addr += PGDIR_SIZE; + continue; + } else if (!(addr & (PGDIR_SIZE - 1)) && + ((end - addr) >= PGDIR_SIZE)) { + stage2_op_pgd(kvm, addr, pgdp, STAGE2_OP_CLEAR); + addr += PGDIR_SIZE; + continue; + } + + if (stage2_have_pmd) { + pmdp = (pmd_t *)pgd_page_vaddr(*pgdp); + if (!pmd_present(*pmdp)) { + addr += PMD_SIZE; + continue; + } else if (!(addr & (PMD_SIZE - 1)) && + ((end - addr) >= PMD_SIZE)) { + stage2_op_pmd(kvm, addr, pmdp, + STAGE2_OP_CLEAR); + addr += PMD_SIZE; + continue; + } + ptep = (pte_t *)pmd_page_vaddr(*pmdp); + } else { + ptep = (pte_t *)pgd_page_vaddr(*pgdp); + } + + stage2_op_pte(kvm, addr, ptep, STAGE2_OP_CLEAR); + addr += PAGE_SIZE; + } +} + +static void stage2_wp_range(struct kvm *kvm, gpa_t start, gpa_t end) +{ + pmd_t *pmdp; + pte_t *ptep; + pgd_t *pgdp; + gpa_t addr = start; + + while (addr < end) { + pgdp = &kvm->arch.pgd[pgd_index(addr)]; + if (!pgd_val(*pgdp)) { + addr += PGDIR_SIZE; + continue; + } else if (!(addr & (PGDIR_SIZE - 1)) && + ((end - addr) >= PGDIR_SIZE)) { + stage2_op_pgd(kvm, addr, pgdp, STAGE2_OP_WP); + addr += PGDIR_SIZE; + continue; + } + + if (stage2_have_pmd) { + pmdp = (pmd_t *)pgd_page_vaddr(*pgdp); + if (!pmd_present(*pmdp)) { + addr += PMD_SIZE; + continue; + } else if (!(addr & (PMD_SIZE - 1)) && + ((end - addr) >= PMD_SIZE)) { + stage2_op_pmd(kvm, addr, pmdp, STAGE2_OP_WP); + addr += PMD_SIZE; + continue; + } + ptep = (pte_t *)pmd_page_vaddr(*pmdp); + } else { + ptep = (pte_t *)pgd_page_vaddr(*pgdp); + } + + stage2_op_pte(kvm, addr, ptep, STAGE2_OP_WP); + addr += PAGE_SIZE; + } +} + +void stage2_wp_memory_region(struct kvm *kvm, int slot) +{ + struct kvm_memslots *slots = kvm_memslots(kvm); + struct kvm_memory_slot *memslot = id_to_memslot(slots, slot); + phys_addr_t start = memslot->base_gfn << PAGE_SHIFT; + phys_addr_t end = (memslot->base_gfn + memslot->npages) << PAGE_SHIFT; + + spin_lock(&kvm->mmu_lock); + stage2_wp_range(kvm, start, end); + spin_unlock(&kvm->mmu_lock); + kvm_flush_remote_tlbs(kvm); +} + +int stage2_ioremap(struct kvm *kvm, gpa_t gpa, phys_addr_t hpa, + unsigned long size, bool writable) +{ + pte_t pte; + int ret = 0; + unsigned long pfn; + phys_addr_t addr, end; + struct kvm_mmu_page_cache pcache = { 0, }; + + end = (gpa + size + PAGE_SIZE - 1) & PAGE_MASK; + pfn = __phys_to_pfn(hpa); + + for (addr = gpa; addr < end; addr += PAGE_SIZE) { + pte = pfn_pte(pfn, PAGE_KERNEL); + + if (!writable) + pte = pte_wrprotect(pte); + + ret = stage2_cache_topup(&pcache, + stage2_cache_min_pages, + KVM_MMU_PAGE_CACHE_NR_OBJS); + if (ret) + goto out; + + spin_lock(&kvm->mmu_lock); + ret = stage2_set_pte(kvm, &pcache, addr, &pte); + spin_unlock(&kvm->mmu_lock); + if (ret) + goto out; + + pfn++; + } + +out: + stage2_cache_flush(&pcache); + return ret; + +} + void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free, struct kvm_memory_slot *dont) { @@ -35,7 +461,7 @@ void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen) void kvm_arch_flush_shadow_all(struct kvm *kvm) { - /* TODO: */ + kvm_riscv_stage2_free_pgd(kvm); } void kvm_arch_flush_shadow_memslot(struct kvm *kvm, @@ -49,7 +475,13 @@ void kvm_arch_commit_memory_region(struct kvm *kvm, const struct kvm_memory_slot *new, enum kvm_mr_change change) { - /* TODO: */ + /* + * At this point memslot has been committed and there is an + * allocated dirty_bitmap[], dirty pages will be be tracked while the + * memory slot is write protected. + */ + if (change != KVM_MR_DELETE && mem->flags & KVM_MEM_LOG_DIRTY_PAGES) + stage2_wp_memory_region(kvm, mem->slot); } int kvm_arch_prepare_memory_region(struct kvm *kvm, @@ -57,34 +489,218 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm, const struct kvm_userspace_memory_region *mem, enum kvm_mr_change change) { - /* TODO: */ - return 0; + hva_t hva = mem->userspace_addr; + hva_t reg_end = hva + mem->memory_size; + bool writable = !(mem->flags & KVM_MEM_READONLY); + int ret = 0; + + if (change != KVM_MR_CREATE && change != KVM_MR_MOVE && + change != KVM_MR_FLAGS_ONLY) + return 0; + + /* + * Prevent userspace from creating a memory region outside of the GPA + * space addressable by the KVM guest GPA space. + */ + if ((memslot->base_gfn + memslot->npages) >= + (stage2_gpa_size >> PAGE_SHIFT)) + return -EFAULT; + + down_read(¤t->mm->mmap_sem); + + /* + * A memory region could potentially cover multiple VMAs, and + * any holes between them, so iterate over all of them to find + * out if we can map any of them right now. + * + * +--------------------------------------------+ + * +---------------+----------------+ +----------------+ + * | : VMA 1 | VMA 2 | | VMA 3 : | + * +---------------+----------------+ +----------------+ + * | memory region | + * +--------------------------------------------+ + */ + do { + struct vm_area_struct *vma = find_vma(current->mm, hva); + hva_t vm_start, vm_end; + + if (!vma || vma->vm_start >= reg_end) + break; + + /* + * Mapping a read-only VMA is only allowed if the + * memory region is configured as read-only. + */ + if (writable && !(vma->vm_flags & VM_WRITE)) { + ret = -EPERM; + break; + } + + /* Take the intersection of this VMA with the memory region */ + vm_start = max(hva, vma->vm_start); + vm_end = min(reg_end, vma->vm_end); + + if (vma->vm_flags & VM_PFNMAP) { + gpa_t gpa = mem->guest_phys_addr + + (vm_start - mem->userspace_addr); + phys_addr_t pa; + + pa = (phys_addr_t)vma->vm_pgoff << PAGE_SHIFT; + pa += vm_start - vma->vm_start; + + /* IO region dirty page logging not allowed */ + if (memslot->flags & KVM_MEM_LOG_DIRTY_PAGES) { + ret = -EINVAL; + goto out; + } + + ret = stage2_ioremap(kvm, gpa, pa, + vm_end - vm_start, writable); + if (ret) + break; + } + hva = vm_end; + } while (hva < reg_end); + + if (change == KVM_MR_FLAGS_ONLY) + goto out; + + spin_lock(&kvm->mmu_lock); + if (ret) + stage2_unmap_range(kvm, mem->guest_phys_addr, + mem->memory_size); + spin_unlock(&kvm->mmu_lock); + +out: + up_read(¤t->mm->mmap_sem); + return ret; } int kvm_riscv_stage2_map(struct kvm_vcpu *vcpu, gpa_t gpa, unsigned long hva, bool is_write) { - /* TODO: */ - return 0; + int ret; + short lsb; + kvm_pfn_t hfn; + bool writeable; + gfn_t gfn = gpa >> PAGE_SHIFT; + struct vm_area_struct *vma; + struct kvm *kvm = vcpu->kvm; + struct kvm_mmu_page_cache *pcache = &vcpu->arch.mmu_page_cache; + unsigned long vma_pagesize; + + down_read(¤t->mm->mmap_sem); + + vma = find_vma_intersection(current->mm, hva, hva + 1); + if (unlikely(!vma)) { + kvm_err("Failed to find VMA for hva 0x%lx\n", hva); + up_read(¤t->mm->mmap_sem); + return -EFAULT; + } + + vma_pagesize = vma_kernel_pagesize(vma); + + up_read(¤t->mm->mmap_sem); + + if (vma_pagesize != PGDIR_SIZE && + vma_pagesize != PMD_SIZE && + vma_pagesize != PAGE_SIZE) { + kvm_err("Invalid VMA page size 0x%lx\n", vma_pagesize); + return -EFAULT; + } + + /* We need minimum second+third level pages */ + ret = stage2_cache_topup(pcache, stage2_cache_min_pages, + KVM_MMU_PAGE_CACHE_NR_OBJS); + if (ret) { + kvm_err("Failed to topup stage2 cache\n"); + return ret; + } + + hfn = gfn_to_pfn_prot(kvm, gfn, is_write, &writeable); + if (hfn == KVM_PFN_ERR_HWPOISON) { + if (is_vm_hugetlb_page(vma)) + lsb = huge_page_shift(hstate_vma(vma)); + else + lsb = PAGE_SHIFT; + + send_sig_mceerr(BUS_MCEERR_AR, (void __user *)hva, + lsb, current); + return 0; + } + if (is_error_noslot_pfn(hfn)) + return -EFAULT; + if (!writeable && is_write) + return -EPERM; + + spin_lock(&kvm->mmu_lock); + + if (writeable) { + kvm_set_pfn_dirty(hfn); + ret = stage2_map_page(kvm, pcache, gpa, hfn << PAGE_SHIFT, + vma_pagesize, PAGE_WRITE_EXEC); + } else { + ret = stage2_map_page(kvm, pcache, gpa, hfn << PAGE_SHIFT, + vma_pagesize, PAGE_READ_EXEC); + } + + if (ret) + kvm_err("Failed to map in stage2\n"); + + spin_unlock(&kvm->mmu_lock); + kvm_set_pfn_accessed(hfn); + kvm_release_pfn_clean(hfn); + return ret; } void kvm_riscv_stage2_flush_cache(struct kvm_vcpu *vcpu) { - /* TODO: */ + stage2_cache_flush(&vcpu->arch.mmu_page_cache); } int kvm_riscv_stage2_alloc_pgd(struct kvm *kvm) { - /* TODO: */ + if (kvm->arch.pgd != NULL) { + kvm_err("kvm_arch already initialized?\n"); + return -EINVAL; + } + + kvm->arch.pgd = alloc_pages_exact(PAGE_SIZE, GFP_KERNEL | __GFP_ZERO); + if (!kvm->arch.pgd) + return -ENOMEM; + kvm->arch.pgd_phys = virt_to_phys(kvm->arch.pgd); + return 0; } void kvm_riscv_stage2_free_pgd(struct kvm *kvm) { - /* TODO: */ + void *pgd = NULL; + + spin_lock(&kvm->mmu_lock); + if (kvm->arch.pgd) { + stage2_unmap_range(kvm, 0UL, stage2_gpa_size); + pgd = READ_ONCE(kvm->arch.pgd); + kvm->arch.pgd = NULL; + kvm->arch.pgd_phys = 0; + } + spin_unlock(&kvm->mmu_lock); + + /* Free the HW pgd, one page at a time */ + if (pgd) + free_pages_exact(pgd, PAGE_SIZE); } void kvm_riscv_stage2_update_hgatp(struct kvm_vcpu *vcpu) { - /* TODO: */ + unsigned long hgatp = HGATP_MODE; + struct kvm_arch *k = &vcpu->kvm->arch; + + hgatp |= (k->vmid.vmid << HGATP_VMID_SHIFT) & HGATP_VMID_MASK; + hgatp |= (k->pgd_phys >> PAGE_SHIFT) & HGATP_PPN; + + csr_write(CSR_HGATP, hgatp); + + if (!kvm_riscv_stage2_vmid_bits()) + __kvm_riscv_hfence_gvma_all(); }