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[121.44.69.75]) by smtp.gmail.com with ESMTPSA id b7-20020a1709027e0700b0019a7bb18f98sm4331859plm.48.2023.03.15.20.17.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 15 Mar 2023 20:17:48 -0700 (PDT) From: Nicholas Piggin To: Paolo Bonzini Subject: [PATCH 1/2] KVM: PPC: Add kvm selftests support for powerpc Date: Thu, 16 Mar 2023 13:17:31 +1000 Message-Id: <20230316031732.3591455-2-npiggin@gmail.com> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20230316031732.3591455-1-npiggin@gmail.com> References: <20230316031732.3591455-1-npiggin@gmail.com> MIME-Version: 1.0 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linuxppc-dev@lists.ozlabs.org, linux-kselftest@vger.kernel.org, Shuah Khan , kvm@vger.kernel.org, Nicholas Piggin Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" Implement KVM selftests support for Book3S-64. ucalls are implemented with an unsuppored PAPR hcall number which causes KVM to exit to userspace. Virtual memory is only implemented for 64K page size and the radix MMU, and only the base page size is supported for now. Signed-off-by: Nicholas Piggin --- tools/testing/selftests/kvm/Makefile | 12 + .../selftests/kvm/include/kvm_util_base.h | 13 + .../selftests/kvm/include/powerpc/hcall.h | 20 + .../selftests/kvm/include/powerpc/processor.h | 13 + tools/testing/selftests/kvm/lib/kvm_util.c | 10 + .../testing/selftests/kvm/lib/powerpc/hcall.c | 45 +++ .../selftests/kvm/lib/powerpc/processor.c | 355 ++++++++++++++++++ .../testing/selftests/kvm/lib/powerpc/ucall.c | 30 ++ 8 files changed, 498 insertions(+) create mode 100644 tools/testing/selftests/kvm/include/powerpc/hcall.h create mode 100644 tools/testing/selftests/kvm/include/powerpc/processor.h create mode 100644 tools/testing/selftests/kvm/lib/powerpc/hcall.c create mode 100644 tools/testing/selftests/kvm/lib/powerpc/processor.c create mode 100644 tools/testing/selftests/kvm/lib/powerpc/ucall.c diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile index 84a627c43795..081cee3ecc0c 100644 --- a/tools/testing/selftests/kvm/Makefile +++ b/tools/testing/selftests/kvm/Makefile @@ -55,6 +55,10 @@ LIBKVM_s390x += lib/s390x/ucall.c LIBKVM_riscv += lib/riscv/processor.c LIBKVM_riscv += lib/riscv/ucall.c +LIBKVM_powerpc += lib/powerpc/processor.c +LIBKVM_powerpc += lib/powerpc/ucall.c +LIBKVM_powerpc += lib/powerpc/hcall.c + # Non-compiled test targets TEST_PROGS_x86_64 += x86_64/nx_huge_pages_test.sh @@ -176,6 +180,14 @@ TEST_GEN_PROGS_riscv += kvm_page_table_test TEST_GEN_PROGS_riscv += set_memory_region_test TEST_GEN_PROGS_riscv += kvm_binary_stats_test +TEST_GEN_PROGS_powerpc += demand_paging_test +TEST_GEN_PROGS_powerpc += dirty_log_test +TEST_GEN_PROGS_powerpc += kvm_create_max_vcpus +TEST_GEN_PROGS_powerpc += kvm_page_table_test +TEST_GEN_PROGS_powerpc += rseq_test +TEST_GEN_PROGS_powerpc += set_memory_region_test +TEST_GEN_PROGS_powerpc += kvm_binary_stats_test + TEST_PROGS += $(TEST_PROGS_$(ARCH_DIR)) TEST_GEN_PROGS += $(TEST_GEN_PROGS_$(ARCH_DIR)) TEST_GEN_PROGS_EXTENDED += $(TEST_GEN_PROGS_EXTENDED_$(ARCH_DIR)) diff --git a/tools/testing/selftests/kvm/include/kvm_util_base.h b/tools/testing/selftests/kvm/include/kvm_util_base.h index fbc2a79369b8..f6807aea634f 100644 --- a/tools/testing/selftests/kvm/include/kvm_util_base.h +++ b/tools/testing/selftests/kvm/include/kvm_util_base.h @@ -105,6 +105,7 @@ struct kvm_vm { bool pgd_created; vm_paddr_t ucall_mmio_addr; vm_paddr_t pgd; + vm_paddr_t prtb; // powerpc process table vm_vaddr_t gdt; vm_vaddr_t tss; vm_vaddr_t idt; @@ -160,6 +161,7 @@ enum vm_guest_mode { VM_MODE_PXXV48_4K, /* For 48bits VA but ANY bits PA */ VM_MODE_P47V64_4K, VM_MODE_P44V64_4K, + VM_MODE_P52V52_64K, VM_MODE_P36V48_4K, VM_MODE_P36V48_16K, VM_MODE_P36V48_64K, @@ -197,6 +199,17 @@ extern enum vm_guest_mode vm_mode_default; #define MIN_PAGE_SHIFT 12U #define ptes_per_page(page_size) ((page_size) / 8) +#elif defined(__powerpc64__) + +/* Radix guest EA and RA are 52-bit on POWER9 and POWER10 */ +#define VM_MODE_DEFAULT VM_MODE_P52V52_64K +#define MIN_PAGE_SHIFT 12U /// XXX: hack to allocate more page table memory because we aren't allocating page tables well on 64K base page size +#define ptes_per_page(page_size) ((page_size) / 8) + +#else + +#error "KVM selftests not implemented for architecture" + #endif #define MIN_PAGE_SIZE (1U << MIN_PAGE_SHIFT) diff --git a/tools/testing/selftests/kvm/include/powerpc/hcall.h b/tools/testing/selftests/kvm/include/powerpc/hcall.h new file mode 100644 index 000000000000..bbad5904f37a --- /dev/null +++ b/tools/testing/selftests/kvm/include/powerpc/hcall.h @@ -0,0 +1,20 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * powerpc hcall defines + */ +#ifndef SELFTEST_KVM_HCALL_H +#define SELFTEST_KVM_HCALL_H + +#include + +/* Ucalls use unimplemented PAPR hcall 0 which exits KVM */ +#define H_UCALL 0 +#define UCALL_R4_UCALL 0x5715 // regular ucall, r5 contains ucall pointer +#define UCALL_R4_EXCPT 0x1b0f // other exception, r5 contains vector, r6,7 SRRs + // R4==0 is a simple asm exit + +int64_t hcall0(uint64_t token); +int64_t hcall1(uint64_t token, uint64_t arg1); +int64_t hcall2(uint64_t token, uint64_t arg1, uint64_t arg2); + +#endif diff --git a/tools/testing/selftests/kvm/include/powerpc/processor.h b/tools/testing/selftests/kvm/include/powerpc/processor.h new file mode 100644 index 000000000000..b800b565b638 --- /dev/null +++ b/tools/testing/selftests/kvm/include/powerpc/processor.h @@ -0,0 +1,13 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * powerpc processor specific defines + */ +#ifndef SELFTEST_KVM_PROCESSOR_H +#define SELFTEST_KVM_PROCESSOR_H + +#include + +struct kvm_vcpu; +extern bool (*interrupt_handler)(struct kvm_vcpu *vcpu, unsigned trap); + +#endif diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c index 3ea24a5f4c43..28ece960a0bb 100644 --- a/tools/testing/selftests/kvm/lib/kvm_util.c +++ b/tools/testing/selftests/kvm/lib/kvm_util.c @@ -153,6 +153,7 @@ const char *vm_guest_mode_string(uint32_t i) [VM_MODE_PXXV48_4K] = "PA-bits:ANY, VA-bits:48, 4K pages", [VM_MODE_P47V64_4K] = "PA-bits:47, VA-bits:64, 4K pages", [VM_MODE_P44V64_4K] = "PA-bits:44, VA-bits:64, 4K pages", + [VM_MODE_P52V52_64K] = "PA-bits:52, VA-bits:52, 64K pages", [VM_MODE_P36V48_4K] = "PA-bits:36, VA-bits:48, 4K pages", [VM_MODE_P36V48_16K] = "PA-bits:36, VA-bits:48, 16K pages", [VM_MODE_P36V48_64K] = "PA-bits:36, VA-bits:48, 64K pages", @@ -178,6 +179,7 @@ const struct vm_guest_mode_params vm_guest_mode_params[] = { [VM_MODE_PXXV48_4K] = { 0, 0, 0x1000, 12 }, [VM_MODE_P47V64_4K] = { 47, 64, 0x1000, 12 }, [VM_MODE_P44V64_4K] = { 44, 64, 0x1000, 12 }, + [VM_MODE_P52V52_64K] = { 52, 52, 0x10000, 16 }, [VM_MODE_P36V48_4K] = { 36, 48, 0x1000, 12 }, [VM_MODE_P36V48_16K] = { 36, 48, 0x4000, 14 }, [VM_MODE_P36V48_64K] = { 36, 48, 0x10000, 16 }, @@ -279,6 +281,14 @@ struct kvm_vm *____vm_create(enum vm_guest_mode mode) case VM_MODE_P44V64_4K: vm->pgtable_levels = 5; break; + case VM_MODE_P52V52_64K: +#ifdef __powerpc__ + TEST_ASSERT(getpagesize() == 64*1024, + "KVM selftests requires 64K host page size\n"); + + vm->pgtable_levels = 4; +#endif + break; default: TEST_FAIL("Unknown guest mode, mode: 0x%x", mode); } diff --git a/tools/testing/selftests/kvm/lib/powerpc/hcall.c b/tools/testing/selftests/kvm/lib/powerpc/hcall.c new file mode 100644 index 000000000000..23a56aabad42 --- /dev/null +++ b/tools/testing/selftests/kvm/lib/powerpc/hcall.c @@ -0,0 +1,45 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * PAPR (pseries) hcall support. + */ +#include "kvm_util.h" +#include "hcall.h" + +int64_t hcall0(uint64_t token) +{ + register uintptr_t r3 asm ("r3") = token; + + asm volatile("sc 1" : "+r"(r3) : + : "r0", "r4", "r5", "r6", "r7", "r8", "r9", + "r10","r11", "r12", "ctr", "xer", + "memory"); + + return r3; +} + +int64_t hcall1(uint64_t token, uint64_t arg1) +{ + register uintptr_t r3 asm ("r3") = token; + register uintptr_t r4 asm ("r4") = arg1; + + asm volatile("sc 1" : "+r"(r3), "+r"(r4) : + : "r0", "r5", "r6", "r7", "r8", "r9", + "r10","r11", "r12", "ctr", "xer", + "memory"); + + return r3; +} + +int64_t hcall2(uint64_t token, uint64_t arg1, uint64_t arg2) +{ + register uintptr_t r3 asm ("r3") = token; + register uintptr_t r4 asm ("r4") = arg1; + register uintptr_t r5 asm ("r5") = arg2; + + asm volatile("sc 1" : "+r"(r3), "+r"(r4), "+r"(r5) : + : "r0", "r6", "r7", "r8", "r9", + "r10","r11", "r12", "ctr", "xer", + "memory"); + + return r3; +} diff --git a/tools/testing/selftests/kvm/lib/powerpc/processor.c b/tools/testing/selftests/kvm/lib/powerpc/processor.c new file mode 100644 index 000000000000..df9901d629cf --- /dev/null +++ b/tools/testing/selftests/kvm/lib/powerpc/processor.c @@ -0,0 +1,355 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * KVM selftest powerpc library code - CPU-related functions (page tables...) + */ + +#include "processor.h" +#include "kvm_util.h" +#include "kvm_util_base.h" +#include "hcall.h" + +#define RTS ((0x2UL << 61) | (0x5UL << 5)) // 52-bits +#define RADIX_PGD_INDEX_SIZE 13 + +void virt_arch_pgd_alloc(struct kvm_vm *vm) +{ + struct kvm_ppc_mmuv3_cfg mmu_cfg; + vm_paddr_t prtb, pgtb; + uint64_t *proc_table, *page_table; + size_t pgd_pages; + + TEST_ASSERT(vm->mode == VM_MODE_P52V52_64K, "Attempt to use " + "unknown or unsupported guest mode, mode: 0x%x", vm->mode); + + /* If needed, create page table */ + if (vm->pgd_created) + return; + + prtb = vm_phy_page_alloc(vm, KVM_GUEST_PAGE_TABLE_MIN_PADDR, + vm->memslots[MEM_REGION_PT]); + proc_table = addr_gpa2hva(vm, prtb); + memset(proc_table, 0, vm->page_size); + vm->prtb = prtb; + + pgd_pages = 1UL << ((RADIX_PGD_INDEX_SIZE + 3) >> vm->page_shift); + TEST_ASSERT(pgd_pages == 1, "PGD allocation must be single page"); + pgtb = vm_phy_page_alloc(vm, KVM_GUEST_PAGE_TABLE_MIN_PADDR, + vm->memslots[MEM_REGION_PT]); + page_table = addr_gpa2hva(vm, pgtb); + memset(page_table, 0, vm->page_size * pgd_pages); + vm->pgd = pgtb; + + /* Set the base page directory in the proc table */ + proc_table[0] = cpu_to_be64(pgtb | RTS | RADIX_PGD_INDEX_SIZE); + + mmu_cfg.process_table = prtb | 0x8000000000000000UL | 0x4; // 64K size + mmu_cfg.flags = KVM_PPC_MMUV3_RADIX | KVM_PPC_MMUV3_GTSE; + + vm_ioctl(vm, KVM_PPC_CONFIGURE_V3_MMU, &mmu_cfg); + + vm->pgd_created = true; +} + +static int pt_shift(struct kvm_vm *vm, int level) +{ + switch (level) { + case 1: + return 13; + case 2: + case 3: + return 9; + case 4: + return 5; + default: + TEST_ASSERT(false, "Invalid page table level %d\n", level); + return 0; + } +} + +static uint64_t pt_entry_coverage(struct kvm_vm *vm, int level) +{ + uint64_t size = vm->page_size; + + if (level == 4) + return size; + size <<= pt_shift(vm, 4); + if (level == 3) + return size; + size <<= pt_shift(vm, 3); + if (level == 2) + return size; + size <<= pt_shift(vm, 2); + return size; +} + +static int pt_idx(struct kvm_vm *vm, uint64_t vaddr, int level, uint64_t *nls) +{ + switch (level) { + case 1: + *nls = 0x9; + return (vaddr >> 39) & 0x1fff; + case 2: + *nls = 0x9; + return (vaddr >> 30) & 0x1ff; + case 3: +// 4K *nls = 0x9; + *nls = 0x5; + return (vaddr >> 21) & 0x1ff; + case 4: +// 4K return (vaddr >> 12) & 0x1ff; + return (vaddr >> 16) & 0x1f; + default: + TEST_ASSERT(false, "Invalid page table level %d\n", level); + return 0; + } +} + +static uint64_t *virt_get_pte(struct kvm_vm *vm, vm_paddr_t pt, + uint64_t vaddr, int level, uint64_t *nls) +{ + uint64_t *page_table = addr_gpa2hva(vm, pt); + int idx = pt_idx(vm, vaddr, level, nls); + + return &page_table[idx]; +} + +#define PTE_VALID 0x8000000000000000ull +#define PTE_LEAF 0x4000000000000000ull +#define PTE_REFERENCED 0x0000000000000100ull +#define PTE_CHANGED 0x0000000000000080ull +#define PTE_PRIV 0x0000000000000008ull +#define PTE_READ 0x0000000000000004ull +#define PTE_RW 0x0000000000000002ull +#define PTE_EXEC 0x0000000000000001ull +#define PTE_PAGE_MASK 0x01fffffffffff000ull + +#define PDE_VALID PTE_VALID +#define PDE_NLS 0x0000000000000011ull +#define PDE_PT_MASK 0x0fffffffffffff00ull + +void virt_arch_pg_map(struct kvm_vm *vm, uint64_t gva, uint64_t gpa) +{ + vm_paddr_t pt = vm->pgd; + uint64_t *ptep, pte; + int level; + + for (level = 1; level <= 3; level++) { + uint64_t nls; + uint64_t *pdep = virt_get_pte(vm, pt, gva, level, &nls); + uint64_t pde = be64_to_cpu(*pdep); + uint64_t *page_table; + + if (pde) { + TEST_ASSERT((pde & PDE_VALID) && !(pde & PTE_LEAF), + "Invalid PDE at level: %u gva: 0x%lx pde:0x%lx\n", + level, gva, pde); + pt = pde & PDE_PT_MASK; + continue; + } + + // XXX: 64K geometry does not require full pages! + pt = vm_phy_page_alloc(vm, + KVM_GUEST_PAGE_TABLE_MIN_PADDR, + vm->memslots[MEM_REGION_PT]); + page_table = addr_gpa2hva(vm, pt); + memset(page_table, 0, vm->page_size); + pde = PDE_VALID | nls | pt; + *pdep = cpu_to_be64(pde); + } + + ptep = virt_get_pte(vm, pt, gva, level, NULL); + pte = be64_to_cpu(*ptep); + + TEST_ASSERT(!pte, + "PTE already present at level: %u gva: 0x%lx pte:0x%lx\n", + level, gva, pte); + + pte = PTE_VALID | PTE_LEAF | PTE_REFERENCED | PTE_CHANGED | PTE_PRIV | PTE_READ | PTE_RW | PTE_EXEC | (gpa & PTE_PAGE_MASK); + *ptep = cpu_to_be64(pte); +} + +vm_paddr_t addr_arch_gva2gpa(struct kvm_vm *vm, vm_vaddr_t gva) +{ + vm_paddr_t pt = vm->pgd; + uint64_t *ptep, pte; + int level; + + for (level = 1; level <= 3; level++) { + uint64_t nls; + uint64_t *pdep = virt_get_pte(vm, pt, gva, level, &nls); + uint64_t pde = be64_to_cpu(*pdep); + + TEST_ASSERT((pde & PDE_VALID) && !(pde & PTE_LEAF), + "PDE not present at level: %u gva: 0x%lx pde:0x%lx\n", + level, gva, pde); + pt = pde & PDE_PT_MASK; + } + + ptep = virt_get_pte(vm, pt, gva, level, NULL); + pte = be64_to_cpu(*ptep); + + TEST_ASSERT(pte, + "PTE not present at level: %u gva: 0x%lx pte:0x%lx\n", + level, gva, pte); + + TEST_ASSERT((pte & PTE_VALID) && (pte & PTE_LEAF) && (pte & PTE_READ) && (pte & PTE_RW) && (pte & PTE_EXEC), + "PTE not valid at level: %u gva: 0x%lx pte:0x%lx\n", + level, gva, pte); + + return (pte & PTE_PAGE_MASK) + (gva & (vm->page_size - 1)); +} + +static void virt_arch_dump_pt(FILE *stream, struct kvm_vm *vm, vm_paddr_t pt, vm_vaddr_t va, int level, uint8_t indent) +{ + uint64_t *page_table; + int size, idx; + + page_table = addr_gpa2hva(vm, pt); + size = 1U << pt_shift(vm, level); + for (idx = 0; idx < size; idx++) { + uint64_t pte = be64_to_cpu(page_table[idx]); + if (pte & PTE_VALID) { + if (pte & PTE_LEAF) { + fprintf(stream, "%*sgVA:0x%016lx -> gRA:0x%016llx\n", indent, "", va, pte & PTE_PAGE_MASK); + } else { + virt_arch_dump_pt(stream, vm, pte & PDE_PT_MASK, va, level + 1, indent); + } + } + va += pt_entry_coverage(vm, level); + } + +} + +void virt_arch_dump(FILE *stream, struct kvm_vm *vm, uint8_t indent) +{ + vm_paddr_t pt = vm->pgd; + + if (!vm->pgd_created) + return; + + virt_arch_dump_pt(stream, vm, pt, 0, 1, indent); +} + +struct kvm_vcpu *vm_arch_vcpu_add(struct kvm_vm *vm, uint32_t vcpu_id, + void *guest_code) +{ + size_t stack_size = 64*1024; + uint64_t stack_vaddr; + struct kvm_regs regs; + struct kvm_vcpu *vcpu; + uint64_t lpcr; + + TEST_ASSERT(vm->page_size == 64*1024, "Unsupported page size: 0x%x", + vm->page_size); + + stack_vaddr = __vm_vaddr_alloc(vm, stack_size, + DEFAULT_GUEST_STACK_VADDR_MIN, + MEM_REGION_DATA); + + vcpu = __vm_vcpu_add(vm, vcpu_id); + + vcpu_enable_cap(vcpu, KVM_CAP_PPC_PAPR, 1); + + /* Setup guest registers */ + vcpu_regs_get(vcpu, ®s); + vcpu_get_reg(vcpu, KVM_REG_PPC_LPCR_64, &lpcr); + + regs.pc = (uintptr_t)guest_code; + regs.gpr[12] = (uintptr_t)guest_code; + regs.msr = 0x8000000002103032ull; + regs.gpr[1] = stack_vaddr + stack_size - 256; + + if (BYTE_ORDER == LITTLE_ENDIAN) { + regs.msr |= 0x1; // LE + lpcr |= 0x0000000002000000; // ILE + } else { + lpcr &= ~0x0000000002000000; // !ILE + } + + vcpu_regs_set(vcpu, ®s); + vcpu_set_reg(vcpu, KVM_REG_PPC_LPCR_64, lpcr); + + return vcpu; +} + +void vcpu_args_set(struct kvm_vcpu *vcpu, unsigned int num, ...) +{ + va_list ap; + struct kvm_regs regs; + int i; + + TEST_ASSERT(num >= 1 && num <= 5, "Unsupported number of args,\n" + " num: %u\n", + num); + + va_start(ap, num); + vcpu_regs_get(vcpu, ®s); + + for (i = 0; i < num; i++) + regs.gpr[i + 3] = va_arg(ap, uint64_t); + + vcpu_regs_set(vcpu, ®s); + va_end(ap); +} + +void vcpu_arch_dump(FILE *stream, struct kvm_vcpu *vcpu, uint8_t indent) +{ + struct kvm_regs regs; + + vcpu_regs_get(vcpu, ®s); + + fprintf(stream, "%*sNIA: 0x%016llx MSR: 0x%016llx\n", indent, "", regs.pc, regs.msr); + fprintf(stream, "%*sLR: 0x%016llx CTR :0x%016llx\n", indent, "", regs.lr, regs.ctr); + fprintf(stream, "%*sCR: 0x%08llx XER :0x%016llx\n", indent, "", regs.cr, regs.xer); +} + +void kvm_arch_vm_post_create(struct kvm_vm *vm) +{ + uint32_t stub[] = { + 0x38600000, // li r3,0 + 0x38800000 | UCALL_R4_EXCPT, // li r4,UCALL_R4_EXCPT + 0x38a00000, // li r5,0 + 0x7cda02a6, // mfspr r5,SRR0 + 0x7cfb02a6, // mfspr r6,SRR1 + 0x44000022, // sc 1 + }; + void *mem; + int i; + + vm_paddr_t excp_paddr = vm_phy_page_alloc(vm, 0, + vm->memslots[MEM_REGION_DATA]); + TEST_ASSERT(excp_paddr == 0, "excp_paddr = 0x%lx\n", excp_paddr); + + mem = addr_gpa2hva(vm, excp_paddr); + + /* Fill with branch-to-self so SRR0/1 don't get lost */ + /* XXX: this requires 2 pages on 4K */ + for (i = 0x100; i < 0x2000; i += 0x20) { + stub[2] = 0x38a00000 | i; // li r5,i + memcpy(mem + i, stub, sizeof(stub)); + } +} + +bool (*interrupt_handler)(struct kvm_vcpu *vcpu, unsigned trap); + +void assert_on_unhandled_exception(struct kvm_vcpu *vcpu) +{ + struct kvm_run *run = vcpu->run; + struct kvm_regs regs; + + if (!(run->exit_reason == KVM_EXIT_PAPR_HCALL && + run->papr_hcall.nr == H_UCALL)) { + return; + } + vcpu_regs_get(vcpu, ®s); + if (regs.gpr[4] != UCALL_R4_EXCPT) + return; + + if (interrupt_handler) { + if (interrupt_handler(vcpu, regs.gpr[5])) + return; // handled + } + + TEST_FAIL("Unhandled exception 0x%llx at NIA:0x%016llx MSR:0x%016llx\n", + regs.gpr[5], regs.gpr[6], regs.gpr[7]); +} diff --git a/tools/testing/selftests/kvm/lib/powerpc/ucall.c b/tools/testing/selftests/kvm/lib/powerpc/ucall.c new file mode 100644 index 000000000000..ce0ddde45fef --- /dev/null +++ b/tools/testing/selftests/kvm/lib/powerpc/ucall.c @@ -0,0 +1,30 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * ucall support. A ucall is a "hypercall to host userspace". + */ +#include "kvm_util.h" +#include "hcall.h" + +void ucall_arch_init(struct kvm_vm *vm, vm_paddr_t mmio_gpa) +{ +} + +void ucall_arch_do_ucall(vm_vaddr_t uc) +{ + hcall2(H_UCALL, UCALL_R4_UCALL, (uintptr_t)(uc)); +} + +void *ucall_arch_get_ucall(struct kvm_vcpu *vcpu) +{ + struct kvm_run *run = vcpu->run; + + if (run->exit_reason == KVM_EXIT_PAPR_HCALL && + run->papr_hcall.nr == H_UCALL) { + struct kvm_regs regs; + + vcpu_regs_get(vcpu, ®s); + if (regs.gpr[4] == UCALL_R4_UCALL) + return (void *)regs.gpr[5]; + } + return NULL; +} From patchwork Thu Mar 16 03:17:32 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicholas Piggin X-Patchwork-Id: 1757693 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org (client-ip=2404:9400:2:0:216:3eff:fee1:b9f1; helo=lists.ozlabs.org; envelope-from=linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org; receiver=) Authentication-Results: legolas.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20210112 header.b=E8U5/GZG; dkim-atps=neutral Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2404:9400:2:0:216:3eff:fee1:b9f1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-384)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4PcXZ60tmSz246q for ; Thu, 16 Mar 2023 14:19:58 +1100 (AEDT) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4PcXZ56p8pz3f5Q for ; Thu, 16 Mar 2023 14:19:57 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20210112 header.b=E8U5/GZG; dkim-atps=neutral X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=gmail.com (client-ip=2607:f8b0:4864:20::102d; helo=mail-pj1-x102d.google.com; envelope-from=npiggin@gmail.com; receiver=) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20210112 header.b=E8U5/GZG; dkim-atps=neutral Received: from mail-pj1-x102d.google.com (mail-pj1-x102d.google.com [IPv6:2607:f8b0:4864:20::102d]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4PcXWk1Z6Wz3c1K for ; Thu, 16 Mar 2023 14:17:54 +1100 (AEDT) Received: by mail-pj1-x102d.google.com with SMTP id qe8-20020a17090b4f8800b0023f07253a2cso239835pjb.3 for ; Wed, 15 Mar 2023 20:17:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; t=1678936672; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=LYb17I8BCPb2EFCzQSFjEgo4PHKuxc2T5i8Z/xiebA4=; b=E8U5/GZGqf3PByeid13InXXn4yaA6mYkYAaRr4fA6KmG/G4JAE1adzFwf2wj3BZvTY /yXaHRsZ5jOtgGU1d6kX96WbE/YW29boqiX5kjWkwqD+nFVvsIJBEZa7b87TwspDREfL cbVDg09EGwfBvveCQMmUARNe3neGAOlN0yjCCP3IFsdlOGycMynTi1Y0Fje7qDJ/NKCk DFgkh/MmTxTfQopkqbPvE6Jr/h6416FFHcX/7jESbvqqRMGEQk/Gnlw24etaowuVqrBX yFHUVeaHbZLczegrZWCRaNt4RNmNX9DVxHFXsCIjbezLkrhtVv849ftT9SVWGqsOCWzr pYdw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1678936672; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=LYb17I8BCPb2EFCzQSFjEgo4PHKuxc2T5i8Z/xiebA4=; b=pkk3P5lio3hNSb1wEo6EVJM2CmIbHxa7CpHWIjG5pzaz13OmnyVUBGnDNtvUBX7xAq QiNyjjIjlZ7k1YfjleI0f8ULjZl5uZwWZVlxqpvyekcCSBOFF/YTMVT6cKtbvrBN8VnX fdAP9RzX1k3Ap5Sni5Qoyx1eYMhFRQLGIj/nlaqXumCwJ8DwVHOPe2pVueAaraEXWT0s R2umqiYdPUxVz33dKNkmjo/ilC9uTecWJLfM97nWIjGR6rtw7bDXeaGplf4BOpPgzVTd NtrH7tCLvY/fKF/2rrUeEsHJh2yzS7tpMaSjZbauDyvtxT+sT0eEXdfOQQWXIq/ZOElm N+pw== X-Gm-Message-State: AO0yUKVH0rwLbZiAmYuMGeCrs0g/xV9Ee7P1aIv+VMtgsmQZojVuu/Ck c7hrfeOZb2vfU1dpfS4qahs= X-Google-Smtp-Source: AK7set880WVudiccd4PFvawdxw6XmcT4cOtGB44ikAvMX6mjuioU29HtYJF9WCF6J4D6e35ixwEY3g== X-Received: by 2002:a17:903:41d2:b0:1a0:57df:864f with SMTP id u18-20020a17090341d200b001a057df864fmr2268728ple.16.1678936672140; Wed, 15 Mar 2023 20:17:52 -0700 (PDT) Received: from bobo.ozlabs.ibm.com (121-44-69-75.tpgi.com.au. [121.44.69.75]) by smtp.gmail.com with ESMTPSA id b7-20020a1709027e0700b0019a7bb18f98sm4331859plm.48.2023.03.15.20.17.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 15 Mar 2023 20:17:51 -0700 (PDT) From: Nicholas Piggin To: Paolo Bonzini Subject: [PATCH 2/2] KVM: PPC: Add basic framework tests for kvm selftests Date: Thu, 16 Mar 2023 13:17:32 +1000 Message-Id: <20230316031732.3591455-3-npiggin@gmail.com> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20230316031732.3591455-1-npiggin@gmail.com> References: <20230316031732.3591455-1-npiggin@gmail.com> MIME-Version: 1.0 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linuxppc-dev@lists.ozlabs.org, linux-kselftest@vger.kernel.org, Shuah Khan , kvm@vger.kernel.org, Nicholas Piggin Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" Add some tests that exercise basic functions of the kvm selftests framework, guest creation, ucalls, hcalls, copying data between guest and host, interrupts and page faults. These don't test KVM so much, but were useful when developing the selftests support for powerpc. Signed-off-by: Nicholas Piggin --- tools/testing/selftests/kvm/Makefile | 2 + .../selftests/kvm/include/powerpc/hcall.h | 4 +- .../testing/selftests/kvm/powerpc/null_test.c | 186 ++++++++++++++++++ .../selftests/kvm/powerpc/rtas_hcall.c | 146 ++++++++++++++ 4 files changed, 337 insertions(+), 1 deletion(-) create mode 100644 tools/testing/selftests/kvm/powerpc/null_test.c create mode 100644 tools/testing/selftests/kvm/powerpc/rtas_hcall.c diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile index 081cee3ecc0c..1d9eb4f3284d 100644 --- a/tools/testing/selftests/kvm/Makefile +++ b/tools/testing/selftests/kvm/Makefile @@ -180,6 +180,8 @@ TEST_GEN_PROGS_riscv += kvm_page_table_test TEST_GEN_PROGS_riscv += set_memory_region_test TEST_GEN_PROGS_riscv += kvm_binary_stats_test +TEST_GEN_PROGS_powerpc += powerpc/null_test +TEST_GEN_PROGS_powerpc += powerpc/rtas_hcall TEST_GEN_PROGS_powerpc += demand_paging_test TEST_GEN_PROGS_powerpc += dirty_log_test TEST_GEN_PROGS_powerpc += kvm_create_max_vcpus diff --git a/tools/testing/selftests/kvm/include/powerpc/hcall.h b/tools/testing/selftests/kvm/include/powerpc/hcall.h index bbad5904f37a..cbcaf180c427 100644 --- a/tools/testing/selftests/kvm/include/powerpc/hcall.h +++ b/tools/testing/selftests/kvm/include/powerpc/hcall.h @@ -11,7 +11,9 @@ #define H_UCALL 0 #define UCALL_R4_UCALL 0x5715 // regular ucall, r5 contains ucall pointer #define UCALL_R4_EXCPT 0x1b0f // other exception, r5 contains vector, r6,7 SRRs - // R4==0 is a simple asm exit +#define UCALL_R4_SIMPLE 0x0000 // simple exit usable by asm with no ucall data + +#define H_RTAS 0xf000 int64_t hcall0(uint64_t token); int64_t hcall1(uint64_t token, uint64_t arg1); diff --git a/tools/testing/selftests/kvm/powerpc/null_test.c b/tools/testing/selftests/kvm/powerpc/null_test.c new file mode 100644 index 000000000000..ee3cf20a5cf3 --- /dev/null +++ b/tools/testing/selftests/kvm/powerpc/null_test.c @@ -0,0 +1,186 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Tests for guest creation, run, ucall, interrupt, and vm dumping. + */ + +#define _GNU_SOURCE /* for program_invocation_short_name */ +#include +#include +#include +#include +#include + +#include "test_util.h" +#include "kvm_util.h" +#include "kselftest.h" +#include "processor.h" + +extern void guest_code_asm(void); +asm(".global guest_code_asm"); +asm(".balign 4"); +asm("guest_code_asm:"); +asm("li 3,0"); // H_UCALL +asm("li 4,0"); // UCALL_R4_SIMPLE +asm("sc 1"); + +static void guest_code_ucall(void) +{ + GUEST_DONE(); +} + +static void guest_code_trap(void) +{ + asm volatile("trap"); +} + +static void guest_code_dsi(void) +{ + *(volatile int *)0; +} + +static void test_asm(void) +{ + struct kvm_vcpu *vcpu; + struct kvm_vm *vm; + int ret; + + vm = vm_create_with_one_vcpu(&vcpu, guest_code_asm); + + ret = _vcpu_run(vcpu); + + TEST_ASSERT(ret == 0, "vcpu_run failed: %d\n", ret); + TEST_ASSERT(get_ucall(vcpu, NULL) == UCALL_NONE, + "Invalid guest done status: exit_reason=%s\n", + exit_reason_str(vcpu->run->exit_reason)); + + kvm_vm_free(vm); +} + +static void test_ucall(void) +{ + struct kvm_vcpu *vcpu; + struct kvm_vm *vm; + int ret; + + vm = vm_create_with_one_vcpu(&vcpu, guest_code_ucall); + + ret = _vcpu_run(vcpu); + + TEST_ASSERT(ret == 0, "vcpu_run failed: %d\n", ret); + TEST_ASSERT(get_ucall(vcpu, NULL) == UCALL_DONE, + "Invalid guest done status: exit_reason=%s\n", + exit_reason_str(vcpu->run->exit_reason)); + + kvm_vm_free(vm); +} + +static bool got_trap; +static bool trap_handler(struct kvm_vcpu *vcpu, unsigned trap) +{ + if (trap == 0x700) { + got_trap = true; + return true; + } + return false; +} + +static void test_trap(void) +{ + struct kvm_vcpu *vcpu; + struct kvm_vm *vm; + int ret; + + interrupt_handler = trap_handler; + + vm = vm_create_with_one_vcpu(&vcpu, guest_code_trap); + + ret = _vcpu_run(vcpu); + + TEST_ASSERT(ret == 0, "vcpu_run failed: %d\n", ret); + TEST_ASSERT(got_trap, + "Invalid guest done status: exit_reason=%s\n", + exit_reason_str(vcpu->run->exit_reason)); + + kvm_vm_free(vm); + + interrupt_handler = NULL; +} + +static bool got_dsi; +static bool dsi_handler(struct kvm_vcpu *vcpu, unsigned trap) +{ + if (trap == 0x300) { + got_dsi = true; + return true; + } + return false; +} + +static void test_dsi(void) +{ + struct kvm_vcpu *vcpu; + struct kvm_vm *vm; + int ret; + + interrupt_handler = dsi_handler; + + vm = vm_create_with_one_vcpu(&vcpu, guest_code_dsi); + + ret = _vcpu_run(vcpu); + + TEST_ASSERT(ret == 0, "vcpu_run failed: %d\n", ret); + TEST_ASSERT(got_dsi, + "Invalid guest done status: exit_reason=%s\n", + exit_reason_str(vcpu->run->exit_reason)); + + vm_dump(stderr, vm, 2); + + kvm_vm_free(vm); + + interrupt_handler = NULL; +} + +static void test_dump(void) +{ + struct kvm_vcpu *vcpu; + struct kvm_vm *vm; + int ret; + + vm = vm_create_with_one_vcpu(&vcpu, guest_code_ucall); + + ret = _vcpu_run(vcpu); + TEST_ASSERT(ret == 0, "vcpu_run failed: %d\n", ret); + + printf("Testing vm_dump...\n"); + vm_dump(stderr, vm, 2); + + kvm_vm_free(vm); +} + + +struct testdef { + const char *name; + void (*test)(void); +} testlist[] = { + { "null asm test", test_asm}, + { "null ucall test", test_ucall}, + { "trap test", test_trap}, + { "page fault test", test_dsi}, + { "vm dump test", test_dump}, +}; + +int main(int argc, char *argv[]) +{ + int idx; + + ksft_print_header(); + + ksft_set_plan(ARRAY_SIZE(testlist)); + + for (idx = 0; idx < ARRAY_SIZE(testlist); idx++) { + testlist[idx].test(); + ksft_test_result_pass("%s\n", testlist[idx].name); + } + + ksft_finished(); /* Print results and exit() accordingly */ +} diff --git a/tools/testing/selftests/kvm/powerpc/rtas_hcall.c b/tools/testing/selftests/kvm/powerpc/rtas_hcall.c new file mode 100644 index 000000000000..17a580d7fa55 --- /dev/null +++ b/tools/testing/selftests/kvm/powerpc/rtas_hcall.c @@ -0,0 +1,146 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Test the KVM H_RTAS hcall and copying buffers between guest and host. + */ + +#define _GNU_SOURCE /* for program_invocation_short_name */ +#include +#include +#include +#include +#include + +#include "test_util.h" +#include "kvm_util.h" +#include "kselftest.h" +#include "hcall.h" + +struct rtas_args { + __be32 token; + __be32 nargs; + __be32 nret; + __be32 args[16]; + __be32 *rets; /* Pointer to return values in args[]. */ +}; + +static void guest_code(void) +{ + struct rtas_args r; + int64_t rc; + + r.token = cpu_to_be32(0xdeadbeef); + r.nargs = cpu_to_be32(3); + r.nret = cpu_to_be32(2); + r.rets = &r.args[3]; + r.args[0] = cpu_to_be32(0x1000); + r.args[1] = cpu_to_be32(0x1001); + r.args[2] = cpu_to_be32(0x1002); + rc = hcall1(H_RTAS, (uint64_t)&r); + GUEST_ASSERT(rc == 0); + GUEST_ASSERT_1(be32_to_cpu(r.rets[0]) == 0xabc, be32_to_cpu(r.rets[0])); + GUEST_ASSERT_1(be32_to_cpu(r.rets[1]) == 0x123, be32_to_cpu(r.rets[1])); + + GUEST_DONE(); +} + +int main(int argc, char *argv[]) +{ + struct kvm_regs regs; + struct rtas_args *r; + vm_vaddr_t rtas_vaddr; + struct ucall uc; + struct kvm_vcpu *vcpu; + struct kvm_vm *vm; + uint64_t tmp; + int ret; + + ksft_print_header(); + + ksft_set_plan(1); + + /* Create VM */ + vm = vm_create_with_one_vcpu(&vcpu, guest_code); + + printf("Running H_RTAS guest vcpu.\n"); + + ret = _vcpu_run(vcpu); + TEST_ASSERT(ret == 0, "vcpu_run failed: %d\n", ret); + switch ((tmp = get_ucall(vcpu, &uc))) { + case UCALL_NONE: + break; // good + case UCALL_DONE: + TEST_FAIL("Unexpected final guest exit %lu\n", tmp); + break; + case UCALL_ABORT: + REPORT_GUEST_ASSERT_N(uc, "values: %lu (0x%lx)\n", + GUEST_ASSERT_ARG(uc, 0), + GUEST_ASSERT_ARG(uc, 0)); + break; + default: + TEST_FAIL("Unexpected guest exit %lu\n", tmp); + } + + TEST_ASSERT(vcpu->run->exit_reason == KVM_EXIT_PAPR_HCALL, + "Expected PAPR_HCALL exit, got %s\n", + exit_reason_str(vcpu->run->exit_reason)); + TEST_ASSERT(vcpu->run->papr_hcall.nr == H_RTAS, + "Expected H_RTAS exit, got %lld\n", + vcpu->run->papr_hcall.nr); + + printf("Got H_RTAS exit.\n"); + + vcpu_regs_get(vcpu, ®s); + rtas_vaddr = regs.gpr[4]; + printf("H_RTAS rtas_args at gEA=0x%lx\n", rtas_vaddr); + + r = addr_gva2hva(vm, rtas_vaddr); + + TEST_ASSERT(r->token == cpu_to_be32(0xdeadbeef), + "Expected RTAS token 0xdeadbeef, got 0x%x\n", + be32_to_cpu(r->token)); + TEST_ASSERT(r->nargs == cpu_to_be32(3), + "Expected RTAS nargs 3, got %u\n", + be32_to_cpu(r->nargs)); + TEST_ASSERT(r->nret == cpu_to_be32(2), + "Expected RTAS nret 2, got %u\n", + be32_to_cpu(r->nret)); + TEST_ASSERT(r->args[0] == cpu_to_be32(0x1000), + "Expected args[0] to be 0x1000, got 0x%x\n", + be32_to_cpu(r->args[0])); + TEST_ASSERT(r->args[1] == cpu_to_be32(0x1001), + "Expected args[1] to be 0x1001, got 0x%x\n", + be32_to_cpu(r->args[1])); + TEST_ASSERT(r->args[2] == cpu_to_be32(0x1002), + "Expected args[2] to be 0x1002, got 0x%x\n", + be32_to_cpu(r->args[2])); + + printf("Guest rtas_args is correct, setting rets.\n"); + + r->args[3] = cpu_to_be32(0xabc); + r->args[4] = cpu_to_be32(0x123); + + regs.gpr[3] = 0; + vcpu_regs_set(vcpu, ®s); + + printf("Running H_RTAS guest vcpu again (hcall return H_SUCCESS).\n"); + + ret = _vcpu_run(vcpu); + TEST_ASSERT(ret == 0, "vcpu_run failed: %d\n", ret); + switch ((tmp = get_ucall(vcpu, &uc))) { + case UCALL_DONE: + printf("Got final guest exit.\n"); + break; + case UCALL_ABORT: + REPORT_GUEST_ASSERT_N(uc, "values: %lu (0x%lx)\n", + GUEST_ASSERT_ARG(uc, 0), + GUEST_ASSERT_ARG(uc, 0)); + break; + default: + TEST_FAIL("Unexpected guest exit %lu\n", tmp); + } + + kvm_vm_free(vm); + + ksft_test_result_pass("%s\n", "null test"); + ksft_finished(); /* Print results and exit() accordingly */ +}