[PATCH v2 4/4] KVM: selftests: Add initial support for RISC-V 64-bit
Atish Patra
atishp at atishpatra.org
Wed Dec 22 00:48:13 PST 2021
On Mon, Nov 29, 2021 at 12:10 AM Anup Patel <anup.patel at wdc.com> wrote:
>
> We add initial support for RISC-V 64-bit in KVM selftests using
> which we can cross-compile and run arch independent tests such as:
> demand_paging_test
> dirty_log_test
> kvm_create_max_vcpus,
> kvm_page_table_test
> set_memory_region_test
> kvm_binary_stats_test
>
> All VM guest modes defined in kvm_util.h require at least 48-bit
> guest virtual address so to use KVM RISC-V selftests hardware
> need to support at least Sv48 MMU for guest (i.e. VS-mode).
>
> Signed-off-by: Anup Patel <anup.patel at wdc.com>
> ---
> tools/testing/selftests/kvm/Makefile | 12 +
> .../testing/selftests/kvm/include/kvm_util.h | 10 +
> .../selftests/kvm/include/riscv/processor.h | 135 +++++++
> tools/testing/selftests/kvm/lib/guest_modes.c | 10 +
> .../selftests/kvm/lib/riscv/processor.c | 362 ++++++++++++++++++
> tools/testing/selftests/kvm/lib/riscv/ucall.c | 87 +++++
> 6 files changed, 616 insertions(+)
> create mode 100644 tools/testing/selftests/kvm/include/riscv/processor.h
> create mode 100644 tools/testing/selftests/kvm/lib/riscv/processor.c
> create mode 100644 tools/testing/selftests/kvm/lib/riscv/ucall.c
>
> diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
> index ee6740e9ecdb..2d825d1e7ff2 100644
> --- a/tools/testing/selftests/kvm/Makefile
> +++ b/tools/testing/selftests/kvm/Makefile
> @@ -32,11 +32,16 @@ endif
> ifeq ($(ARCH),s390)
> UNAME_M := s390x
> endif
> +# Set UNAME_M riscv compile/install to work
> +ifeq ($(ARCH),riscv)
> + UNAME_M := riscv
> +endif
>
> LIBKVM = lib/assert.c lib/elf.c lib/io.c lib/kvm_util.c lib/rbtree.c lib/sparsebit.c lib/test_util.c lib/guest_modes.c lib/perf_test_util.c
> LIBKVM_x86_64 = lib/x86_64/apic.c lib/x86_64/processor.c lib/x86_64/vmx.c lib/x86_64/svm.c lib/x86_64/ucall.c lib/x86_64/handlers.S
> LIBKVM_aarch64 = lib/aarch64/processor.c lib/aarch64/ucall.c lib/aarch64/handlers.S lib/aarch64/spinlock.c lib/aarch64/gic.c lib/aarch64/gic_v3.c lib/aarch64/vgic.c
> LIBKVM_s390x = lib/s390x/processor.c lib/s390x/ucall.c lib/s390x/diag318_test_handler.c
> +LIBKVM_riscv = lib/riscv/processor.c lib/riscv/ucall.c
>
> TEST_GEN_PROGS_x86_64 = x86_64/cr4_cpuid_sync_test
> TEST_GEN_PROGS_x86_64 += x86_64/get_msr_index_features
> @@ -117,6 +122,13 @@ TEST_GEN_PROGS_s390x += rseq_test
> TEST_GEN_PROGS_s390x += set_memory_region_test
> TEST_GEN_PROGS_s390x += kvm_binary_stats_test
>
> +TEST_GEN_PROGS_riscv += demand_paging_test
> +TEST_GEN_PROGS_riscv += dirty_log_test
> +TEST_GEN_PROGS_riscv += kvm_create_max_vcpus
> +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 += $(TEST_GEN_PROGS_$(UNAME_M))
> LIBKVM += $(LIBKVM_$(UNAME_M))
>
> diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h
> index 6a1a37f30494..c23e5be14862 100644
> --- a/tools/testing/selftests/kvm/include/kvm_util.h
> +++ b/tools/testing/selftests/kvm/include/kvm_util.h
> @@ -69,6 +69,16 @@ enum vm_guest_mode {
> #define MIN_PAGE_SHIFT 12U
> #define ptes_per_page(page_size) ((page_size) / 16)
>
> +#elif defined(__riscv)
> +
> +#if __riscv_xlen == 32
> +#error "RISC-V 32-bit kvm selftests not supported"
> +#endif
> +
> +#define VM_MODE_DEFAULT VM_MODE_P40V48_4K
> +#define MIN_PAGE_SHIFT 12U
> +#define ptes_per_page(page_size) ((page_size) / 8)
> +
> #endif
>
> #define MIN_PAGE_SIZE (1U << MIN_PAGE_SHIFT)
> diff --git a/tools/testing/selftests/kvm/include/riscv/processor.h b/tools/testing/selftests/kvm/include/riscv/processor.h
> new file mode 100644
> index 000000000000..dc284c6bdbc3
> --- /dev/null
> +++ b/tools/testing/selftests/kvm/include/riscv/processor.h
> @@ -0,0 +1,135 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * RISC-V processor specific defines
> + *
> + * Copyright (C) 2021 Western Digital Corporation or its affiliates.
> + */
> +#ifndef SELFTEST_KVM_PROCESSOR_H
> +#define SELFTEST_KVM_PROCESSOR_H
> +
> +#include "kvm_util.h"
> +#include <linux/stringify.h>
> +
> +static inline uint64_t __kvm_reg_id(uint64_t type, uint64_t idx,
> + uint64_t size)
> +{
> + return KVM_REG_RISCV | type | idx | size;
> +}
> +
> +#if __riscv_xlen == 64
> +#define KVM_REG_SIZE_ULONG KVM_REG_SIZE_U64
> +#else
> +#define KVM_REG_SIZE_ULONG KVM_REG_SIZE_U32
> +#endif
> +
> +#define RISCV_CONFIG_REG(name) __kvm_reg_id(KVM_REG_RISCV_CONFIG, \
> + KVM_REG_RISCV_CONFIG_REG(name), \
> + KVM_REG_SIZE_ULONG)
> +
> +#define RISCV_CORE_REG(name) __kvm_reg_id(KVM_REG_RISCV_CORE, \
> + KVM_REG_RISCV_CORE_REG(name), \
> + KVM_REG_SIZE_ULONG)
> +
> +#define RISCV_CSR_REG(name) __kvm_reg_id(KVM_REG_RISCV_CSR, \
> + KVM_REG_RISCV_CSR_REG(name), \
> + KVM_REG_SIZE_ULONG)
> +
> +#define RISCV_TIMER_REG(name) __kvm_reg_id(KVM_REG_RISCV_TIMER, \
> + KVM_REG_RISCV_TIMER_REG(name), \
> + KVM_REG_SIZE_U64)
> +
> +static inline void get_reg(struct kvm_vm *vm, uint32_t vcpuid, uint64_t id,
> + unsigned long *addr)
> +{
> + struct kvm_one_reg reg;
> +
> + reg.id = id;
> + reg.addr = (unsigned long)addr;
> + vcpu_get_reg(vm, vcpuid, ®);
> +}
> +
> +static inline void set_reg(struct kvm_vm *vm, uint32_t vcpuid, uint64_t id,
> + unsigned long val)
> +{
> + struct kvm_one_reg reg;
> +
> + reg.id = id;
> + reg.addr = (unsigned long)&val;
> + vcpu_set_reg(vm, vcpuid, ®);
> +}
> +
> +/* L3 index Bit[47:39] */
> +#define PGTBL_L3_INDEX_MASK 0x0000FF8000000000ULL
> +#define PGTBL_L3_INDEX_SHIFT 39
> +#define PGTBL_L3_BLOCK_SHIFT 39
> +#define PGTBL_L3_BLOCK_SIZE 0x0000008000000000ULL
> +#define PGTBL_L3_MAP_MASK (~(PGTBL_L3_BLOCK_SIZE - 1))
> +/* L2 index Bit[38:30] */
> +#define PGTBL_L2_INDEX_MASK 0x0000007FC0000000ULL
> +#define PGTBL_L2_INDEX_SHIFT 30
> +#define PGTBL_L2_BLOCK_SHIFT 30
> +#define PGTBL_L2_BLOCK_SIZE 0x0000000040000000ULL
> +#define PGTBL_L2_MAP_MASK (~(PGTBL_L2_BLOCK_SIZE - 1))
> +/* L1 index Bit[29:21] */
> +#define PGTBL_L1_INDEX_MASK 0x000000003FE00000ULL
> +#define PGTBL_L1_INDEX_SHIFT 21
> +#define PGTBL_L1_BLOCK_SHIFT 21
> +#define PGTBL_L1_BLOCK_SIZE 0x0000000000200000ULL
> +#define PGTBL_L1_MAP_MASK (~(PGTBL_L1_BLOCK_SIZE - 1))
> +/* L0 index Bit[20:12] */
> +#define PGTBL_L0_INDEX_MASK 0x00000000001FF000ULL
> +#define PGTBL_L0_INDEX_SHIFT 12
> +#define PGTBL_L0_BLOCK_SHIFT 12
> +#define PGTBL_L0_BLOCK_SIZE 0x0000000000001000ULL
> +#define PGTBL_L0_MAP_MASK (~(PGTBL_L0_BLOCK_SIZE - 1))
> +
> +#define PGTBL_PTE_ADDR_MASK 0x003FFFFFFFFFFC00ULL
> +#define PGTBL_PTE_ADDR_SHIFT 10
> +#define PGTBL_PTE_RSW_MASK 0x0000000000000300ULL
> +#define PGTBL_PTE_RSW_SHIFT 8
> +#define PGTBL_PTE_DIRTY_MASK 0x0000000000000080ULL
> +#define PGTBL_PTE_DIRTY_SHIFT 7
> +#define PGTBL_PTE_ACCESSED_MASK 0x0000000000000040ULL
> +#define PGTBL_PTE_ACCESSED_SHIFT 6
> +#define PGTBL_PTE_GLOBAL_MASK 0x0000000000000020ULL
> +#define PGTBL_PTE_GLOBAL_SHIFT 5
> +#define PGTBL_PTE_USER_MASK 0x0000000000000010ULL
> +#define PGTBL_PTE_USER_SHIFT 4
> +#define PGTBL_PTE_EXECUTE_MASK 0x0000000000000008ULL
> +#define PGTBL_PTE_EXECUTE_SHIFT 3
> +#define PGTBL_PTE_WRITE_MASK 0x0000000000000004ULL
> +#define PGTBL_PTE_WRITE_SHIFT 2
> +#define PGTBL_PTE_READ_MASK 0x0000000000000002ULL
> +#define PGTBL_PTE_READ_SHIFT 1
> +#define PGTBL_PTE_PERM_MASK (PGTBL_PTE_EXECUTE_MASK | \
> + PGTBL_PTE_WRITE_MASK | \
> + PGTBL_PTE_READ_MASK)
> +#define PGTBL_PTE_VALID_MASK 0x0000000000000001ULL
> +#define PGTBL_PTE_VALID_SHIFT 0
> +
> +#define PGTBL_PAGE_SIZE PGTBL_L0_BLOCK_SIZE
> +#define PGTBL_PAGE_SIZE_SHIFT PGTBL_L0_BLOCK_SHIFT
> +
> +#define SATP_PPN _AC(0x00000FFFFFFFFFFF, UL)
> +#define SATP_MODE_39 _AC(0x8000000000000000, UL)
> +#define SATP_MODE_48 _AC(0x9000000000000000, UL)
> +#define SATP_ASID_BITS 16
> +#define SATP_ASID_SHIFT 44
> +#define SATP_ASID_MASK _AC(0xFFFF, UL)
> +
> +#define SBI_EXT_EXPERIMENTAL_START 0x08000000
> +#define SBI_EXT_EXPERIMENTAL_END 0x08FFFFFF
> +
> +#define KVM_RISCV_SELFTESTS_SBI_EXT SBI_EXT_EXPERIMENTAL_END
> +
> +struct sbiret {
> + long error;
> + long value;
> +};
> +
> +struct sbiret sbi_ecall(int ext, int fid, unsigned long arg0,
> + unsigned long arg1, unsigned long arg2,
> + unsigned long arg3, unsigned long arg4,
> + unsigned long arg5);
> +
> +#endif /* SELFTEST_KVM_PROCESSOR_H */
> diff --git a/tools/testing/selftests/kvm/lib/guest_modes.c b/tools/testing/selftests/kvm/lib/guest_modes.c
> index c330f414ef96..57839a12e472 100644
> --- a/tools/testing/selftests/kvm/lib/guest_modes.c
> +++ b/tools/testing/selftests/kvm/lib/guest_modes.c
> @@ -38,6 +38,16 @@ void guest_modes_append_default(void)
> guest_mode_append(VM_MODE_P47V64_4K, true, true);
> }
> #endif
> +#ifdef __riscv
> + {
> + unsigned int sz = kvm_check_cap(KVM_CAP_VM_GPA_BITS);
> +
> + if (sz >= 52)
> + guest_mode_append(VM_MODE_P52V48_4K, true, true);
> + if (sz >= 48)
> + guest_mode_append(VM_MODE_P48V48_4K, true, true);
> + }
> +#endif
> }
>
> void for_each_guest_mode(void (*func)(enum vm_guest_mode, void *), void *arg)
> diff --git a/tools/testing/selftests/kvm/lib/riscv/processor.c b/tools/testing/selftests/kvm/lib/riscv/processor.c
> new file mode 100644
> index 000000000000..d377f2603d98
> --- /dev/null
> +++ b/tools/testing/selftests/kvm/lib/riscv/processor.c
> @@ -0,0 +1,362 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * RISC-V code
> + *
> + * Copyright (C) 2021 Western Digital Corporation or its affiliates.
> + */
> +
> +#include <linux/compiler.h>
> +#include <assert.h>
> +
> +#include "kvm_util.h"
> +#include "../kvm_util_internal.h"
> +#include "processor.h"
> +
> +#define DEFAULT_RISCV_GUEST_STACK_VADDR_MIN 0xac0000
> +
> +static uint64_t page_align(struct kvm_vm *vm, uint64_t v)
> +{
> + return (v + vm->page_size) & ~(vm->page_size - 1);
> +}
> +
> +static uint64_t pte_addr(struct kvm_vm *vm, uint64_t entry)
> +{
> + return ((entry & PGTBL_PTE_ADDR_MASK) >> PGTBL_PTE_ADDR_SHIFT) <<
> + PGTBL_PAGE_SIZE_SHIFT;
> +}
> +
> +static uint64_t ptrs_per_pte(struct kvm_vm *vm)
> +{
> + return PGTBL_PAGE_SIZE / sizeof(uint64_t);
> +}
> +
> +static uint64_t pte_index_mask[] = {
> + PGTBL_L0_INDEX_MASK,
> + PGTBL_L1_INDEX_MASK,
> + PGTBL_L2_INDEX_MASK,
> + PGTBL_L3_INDEX_MASK,
> +};
> +
> +static uint32_t pte_index_shift[] = {
> + PGTBL_L0_INDEX_SHIFT,
> + PGTBL_L1_INDEX_SHIFT,
> + PGTBL_L2_INDEX_SHIFT,
> + PGTBL_L3_INDEX_SHIFT,
> +};
> +
> +static uint64_t pte_index(struct kvm_vm *vm, vm_vaddr_t gva, int level)
> +{
> + TEST_ASSERT(level > -1,
> + "Negative page table level (%d) not possible", level);
> + TEST_ASSERT(level < vm->pgtable_levels,
> + "Invalid page table level (%d)", level);
> +
> + return (gva & pte_index_mask[level]) >> pte_index_shift[level];
> +}
> +
> +void virt_pgd_alloc(struct kvm_vm *vm)
> +{
> + if (!vm->pgd_created) {
> + vm_paddr_t paddr = vm_phy_pages_alloc(vm,
> + page_align(vm, ptrs_per_pte(vm) * 8) / vm->page_size,
> + KVM_GUEST_PAGE_TABLE_MIN_PADDR, 0);
> + vm->pgd = paddr;
> + vm->pgd_created = true;
> + }
> +}
> +
> +void virt_pg_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr)
> +{
> + uint64_t *ptep, next_ppn;
> + int level = vm->pgtable_levels - 1;
> +
> + TEST_ASSERT((vaddr % vm->page_size) == 0,
> + "Virtual address not on page boundary,\n"
> + " vaddr: 0x%lx vm->page_size: 0x%x", vaddr, vm->page_size);
> + TEST_ASSERT(sparsebit_is_set(vm->vpages_valid,
> + (vaddr >> vm->page_shift)),
> + "Invalid virtual address, vaddr: 0x%lx", vaddr);
> + TEST_ASSERT((paddr % vm->page_size) == 0,
> + "Physical address not on page boundary,\n"
> + " paddr: 0x%lx vm->page_size: 0x%x", paddr, vm->page_size);
> + TEST_ASSERT((paddr >> vm->page_shift) <= vm->max_gfn,
> + "Physical address beyond maximum supported,\n"
> + " paddr: 0x%lx vm->max_gfn: 0x%lx vm->page_size: 0x%x",
> + paddr, vm->max_gfn, vm->page_size);
> +
> + ptep = addr_gpa2hva(vm, vm->pgd) + pte_index(vm, vaddr, level) * 8;
> + if (!*ptep) {
> + next_ppn = vm_alloc_page_table(vm) >> PGTBL_PAGE_SIZE_SHIFT;
> + *ptep = (next_ppn << PGTBL_PTE_ADDR_SHIFT) |
> + PGTBL_PTE_VALID_MASK;
> + }
> + level--;
> +
> + while (level > -1) {
> + ptep = addr_gpa2hva(vm, pte_addr(vm, *ptep)) +
> + pte_index(vm, vaddr, level) * 8;
> + if (!*ptep && level > 0) {
> + next_ppn = vm_alloc_page_table(vm) >>
> + PGTBL_PAGE_SIZE_SHIFT;
> + *ptep = (next_ppn << PGTBL_PTE_ADDR_SHIFT) |
> + PGTBL_PTE_VALID_MASK;
> + }
> + level--;
> + }
> +
> + paddr = paddr >> PGTBL_PAGE_SIZE_SHIFT;
> + *ptep = (paddr << PGTBL_PTE_ADDR_SHIFT) |
> + PGTBL_PTE_PERM_MASK | PGTBL_PTE_VALID_MASK;
> +}
> +
> +vm_paddr_t addr_gva2gpa(struct kvm_vm *vm, vm_vaddr_t gva)
> +{
> + uint64_t *ptep;
> + int level = vm->pgtable_levels - 1;
> +
> + if (!vm->pgd_created)
> + goto unmapped_gva;
> +
> + ptep = addr_gpa2hva(vm, vm->pgd) + pte_index(vm, gva, level) * 8;
> + if (!ptep)
> + goto unmapped_gva;
> + level--;
> +
> + while (level > -1) {
> + ptep = addr_gpa2hva(vm, pte_addr(vm, *ptep)) +
> + pte_index(vm, gva, level) * 8;
> + if (!ptep)
> + goto unmapped_gva;
> + level--;
> + }
> +
> + return pte_addr(vm, *ptep) + (gva & (vm->page_size - 1));
> +
> +unmapped_gva:
> + TEST_FAIL("No mapping for vm virtual address gva: 0x%lx level: %d",
> + gva, level);
> + exit(1);
> +}
> +
> +static void pte_dump(FILE *stream, struct kvm_vm *vm, uint8_t indent,
> + uint64_t page, int level)
> +{
> +#ifdef DEBUG
> + static const char *const type[] = { "pte", "pmd", "pud", "p4d"};
> + uint64_t pte, *ptep;
> +
> + if (level < 0)
> + return;
> +
> + for (pte = page; pte < page + ptrs_per_pte(vm) * 8; pte += 8) {
> + ptep = addr_gpa2hva(vm, pte);
> + if (!*ptep)
> + continue;
> + fprintf(stream, "%*s%s: %lx: %lx at %p\n", indent, "",
> + type[level], pte, *ptep, ptep);
> + pte_dump(stream, vm, indent + 1,
> + pte_addr(vm, *ptep), level - 1);
> + }
> +#endif
> +}
> +
> +void virt_dump(FILE *stream, struct kvm_vm *vm, uint8_t indent)
> +{
> + int level = vm->pgtable_levels - 1;
> + uint64_t pgd, *ptep;
> +
> + if (!vm->pgd_created)
> + return;
> +
> + for (pgd = vm->pgd; pgd < vm->pgd + ptrs_per_pte(vm) * 8; pgd += 8) {
> + ptep = addr_gpa2hva(vm, pgd);
> + if (!*ptep)
> + continue;
> + fprintf(stream, "%*spgd: %lx: %lx at %p\n", indent, "",
> + pgd, *ptep, ptep);
> + pte_dump(stream, vm, indent + 1,
> + pte_addr(vm, *ptep), level - 1);
> + }
> +}
> +
> +void riscv_vcpu_mmu_setup(struct kvm_vm *vm, int vcpuid)
> +{
> + unsigned long satp;
> +
> + /*
> + * The RISC-V Sv48 MMU mode supports 56-bit physical address
> + * for 48-bit virtual address with 4KB last level page size.
> + */
> + switch (vm->mode) {
> + case VM_MODE_P52V48_4K:
> + case VM_MODE_P48V48_4K:
> + case VM_MODE_P40V48_4K:
> + break;
> + default:
> + TEST_FAIL("Unknown guest mode, mode: 0x%x", vm->mode);
> + }
> +
> + satp = (vm->pgd >> PGTBL_PAGE_SIZE_SHIFT) & SATP_PPN;
> + satp |= SATP_MODE_48;
> +
> + set_reg(vm, vcpuid, RISCV_CSR_REG(satp), satp);
> +}
> +
> +void vcpu_dump(FILE *stream, struct kvm_vm *vm, uint32_t vcpuid, uint8_t indent)
> +{
> + struct kvm_riscv_core core;
> +
> + get_reg(vm, vcpuid, RISCV_CORE_REG(mode), &core.mode);
> + get_reg(vm, vcpuid, RISCV_CORE_REG(regs.pc), &core.regs.pc);
> + get_reg(vm, vcpuid, RISCV_CORE_REG(regs.ra), &core.regs.ra);
> + get_reg(vm, vcpuid, RISCV_CORE_REG(regs.sp), &core.regs.sp);
> + get_reg(vm, vcpuid, RISCV_CORE_REG(regs.gp), &core.regs.gp);
> + get_reg(vm, vcpuid, RISCV_CORE_REG(regs.tp), &core.regs.tp);
> + get_reg(vm, vcpuid, RISCV_CORE_REG(regs.t0), &core.regs.t0);
> + get_reg(vm, vcpuid, RISCV_CORE_REG(regs.t1), &core.regs.t1);
> + get_reg(vm, vcpuid, RISCV_CORE_REG(regs.t2), &core.regs.t2);
> + get_reg(vm, vcpuid, RISCV_CORE_REG(regs.s0), &core.regs.s0);
> + get_reg(vm, vcpuid, RISCV_CORE_REG(regs.s1), &core.regs.s1);
> + get_reg(vm, vcpuid, RISCV_CORE_REG(regs.a0), &core.regs.a0);
> + get_reg(vm, vcpuid, RISCV_CORE_REG(regs.a1), &core.regs.a1);
> + get_reg(vm, vcpuid, RISCV_CORE_REG(regs.a2), &core.regs.a2);
> + get_reg(vm, vcpuid, RISCV_CORE_REG(regs.a3), &core.regs.a3);
> + get_reg(vm, vcpuid, RISCV_CORE_REG(regs.a4), &core.regs.a4);
> + get_reg(vm, vcpuid, RISCV_CORE_REG(regs.a5), &core.regs.a5);
> + get_reg(vm, vcpuid, RISCV_CORE_REG(regs.a6), &core.regs.a6);
> + get_reg(vm, vcpuid, RISCV_CORE_REG(regs.a7), &core.regs.a7);
> + get_reg(vm, vcpuid, RISCV_CORE_REG(regs.s2), &core.regs.s2);
> + get_reg(vm, vcpuid, RISCV_CORE_REG(regs.s3), &core.regs.s3);
> + get_reg(vm, vcpuid, RISCV_CORE_REG(regs.s4), &core.regs.s4);
> + get_reg(vm, vcpuid, RISCV_CORE_REG(regs.s5), &core.regs.s5);
> + get_reg(vm, vcpuid, RISCV_CORE_REG(regs.s6), &core.regs.s6);
> + get_reg(vm, vcpuid, RISCV_CORE_REG(regs.s7), &core.regs.s7);
> + get_reg(vm, vcpuid, RISCV_CORE_REG(regs.s8), &core.regs.s8);
> + get_reg(vm, vcpuid, RISCV_CORE_REG(regs.s9), &core.regs.s9);
> + get_reg(vm, vcpuid, RISCV_CORE_REG(regs.s10), &core.regs.s10);
> + get_reg(vm, vcpuid, RISCV_CORE_REG(regs.s11), &core.regs.s11);
> + get_reg(vm, vcpuid, RISCV_CORE_REG(regs.t3), &core.regs.t3);
> + get_reg(vm, vcpuid, RISCV_CORE_REG(regs.t4), &core.regs.t4);
> + get_reg(vm, vcpuid, RISCV_CORE_REG(regs.t5), &core.regs.t5);
> + get_reg(vm, vcpuid, RISCV_CORE_REG(regs.t6), &core.regs.t6);
> +
> + fprintf(stream,
> + " MODE: 0x%lx\n", core.mode);
> + fprintf(stream,
> + " PC: 0x%016lx RA: 0x%016lx SP: 0x%016lx GP: 0x%016lx\n",
> + core.regs.pc, core.regs.ra, core.regs.sp, core.regs.gp);
> + fprintf(stream,
> + " TP: 0x%016lx T0: 0x%016lx T1: 0x%016lx T2: 0x%016lx\n",
> + core.regs.tp, core.regs.t0, core.regs.t1, core.regs.t2);
> + fprintf(stream,
> + " S0: 0x%016lx S1: 0x%016lx A0: 0x%016lx A1: 0x%016lx\n",
> + core.regs.s0, core.regs.s1, core.regs.a0, core.regs.a1);
> + fprintf(stream,
> + " A2: 0x%016lx A3: 0x%016lx A4: 0x%016lx A5: 0x%016lx\n",
> + core.regs.a2, core.regs.a3, core.regs.a4, core.regs.a5);
> + fprintf(stream,
> + " A6: 0x%016lx A7: 0x%016lx S2: 0x%016lx S3: 0x%016lx\n",
> + core.regs.a6, core.regs.a7, core.regs.s2, core.regs.s3);
> + fprintf(stream,
> + " S4: 0x%016lx S5: 0x%016lx S6: 0x%016lx S7: 0x%016lx\n",
> + core.regs.s4, core.regs.s5, core.regs.s6, core.regs.s7);
> + fprintf(stream,
> + " S8: 0x%016lx S9: 0x%016lx S10: 0x%016lx S11: 0x%016lx\n",
> + core.regs.s8, core.regs.s9, core.regs.s10, core.regs.s11);
> + fprintf(stream,
> + " T3: 0x%016lx T4: 0x%016lx T5: 0x%016lx T6: 0x%016lx\n",
> + core.regs.t3, core.regs.t4, core.regs.t5, core.regs.t6);
> +}
> +
> +static void guest_hang(void)
> +{
> + while (1)
> + ;
> +}
> +
> +void vm_vcpu_add_default(struct kvm_vm *vm, uint32_t vcpuid, void *guest_code)
> +{
> + int r;
> + size_t stack_size = vm->page_size == 4096 ?
> + DEFAULT_STACK_PGS * vm->page_size :
> + vm->page_size;
> + unsigned long stack_vaddr = vm_vaddr_alloc(vm, stack_size,
> + DEFAULT_RISCV_GUEST_STACK_VADDR_MIN);
> + unsigned long current_gp = 0;
> + struct kvm_mp_state mps;
> +
> + vm_vcpu_add(vm, vcpuid);
> + riscv_vcpu_mmu_setup(vm, vcpuid);
> +
> + /*
> + * With SBI HSM support in KVM RISC-V, all secondary VCPUs are
> + * powered-off by default so we ensure that all secondary VCPUs
> + * are powered-on using KVM_SET_MP_STATE ioctl().
> + */
> + mps.mp_state = KVM_MP_STATE_RUNNABLE;
> + r = _vcpu_ioctl(vm, vcpuid, KVM_SET_MP_STATE, &mps);
> + TEST_ASSERT(!r, "IOCTL KVM_SET_MP_STATE failed (error %d)", r);
> +
> + /* Setup global pointer of guest to be same as the host */
> + asm volatile (
> + "add %0, gp, zero" : "=r" (current_gp) : : "memory");
> + set_reg(vm, vcpuid, RISCV_CORE_REG(regs.gp), current_gp);
> +
> + /* Setup stack pointer and program counter of guest */
> + set_reg(vm, vcpuid, RISCV_CORE_REG(regs.sp),
> + stack_vaddr + stack_size);
> + set_reg(vm, vcpuid, RISCV_CORE_REG(regs.pc),
> + (unsigned long)guest_code);
> +
> + /* Setup default exception vector of guest */
> + set_reg(vm, vcpuid, RISCV_CSR_REG(stvec),
> + (unsigned long)guest_hang);
> +}
> +
> +void vcpu_args_set(struct kvm_vm *vm, uint32_t vcpuid, unsigned int num, ...)
> +{
> + va_list ap;
> + uint64_t id = RISCV_CORE_REG(regs.a0);
> + int i;
> +
> + TEST_ASSERT(num >= 1 && num <= 8, "Unsupported number of args,\n"
> + " num: %u\n", num);
> +
> + va_start(ap, num);
> +
> + for (i = 0; i < num; i++) {
> + switch (i) {
> + case 0:
> + id = RISCV_CORE_REG(regs.a0);
> + break;
> + case 1:
> + id = RISCV_CORE_REG(regs.a1);
> + break;
> + case 2:
> + id = RISCV_CORE_REG(regs.a2);
> + break;
> + case 3:
> + id = RISCV_CORE_REG(regs.a3);
> + break;
> + case 4:
> + id = RISCV_CORE_REG(regs.a4);
> + break;
> + case 5:
> + id = RISCV_CORE_REG(regs.a5);
> + break;
> + case 6:
> + id = RISCV_CORE_REG(regs.a6);
> + break;
> + case 7:
> + id = RISCV_CORE_REG(regs.a7);
> + break;
> + };
> + set_reg(vm, vcpuid, id, va_arg(ap, uint64_t));
> + }
> +
> + va_end(ap);
> +}
> +
> +void assert_on_unhandled_exception(struct kvm_vm *vm, uint32_t vcpuid)
> +{
> +}
> diff --git a/tools/testing/selftests/kvm/lib/riscv/ucall.c b/tools/testing/selftests/kvm/lib/riscv/ucall.c
> new file mode 100644
> index 000000000000..9e42d8248fa6
> --- /dev/null
> +++ b/tools/testing/selftests/kvm/lib/riscv/ucall.c
> @@ -0,0 +1,87 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * ucall support. A ucall is a "hypercall to userspace".
> + *
> + * Copyright (C) 2021 Western Digital Corporation or its affiliates.
> + */
> +
> +#include <linux/kvm.h>
> +
> +#include "kvm_util.h"
> +#include "../kvm_util_internal.h"
> +#include "processor.h"
> +
> +void ucall_init(struct kvm_vm *vm, void *arg)
> +{
> +}
> +
> +void ucall_uninit(struct kvm_vm *vm)
> +{
> +}
> +
> +struct sbiret sbi_ecall(int ext, int fid, unsigned long arg0,
> + unsigned long arg1, unsigned long arg2,
> + unsigned long arg3, unsigned long arg4,
> + unsigned long arg5)
> +{
> + register uintptr_t a0 asm ("a0") = (uintptr_t)(arg0);
> + register uintptr_t a1 asm ("a1") = (uintptr_t)(arg1);
> + register uintptr_t a2 asm ("a2") = (uintptr_t)(arg2);
> + register uintptr_t a3 asm ("a3") = (uintptr_t)(arg3);
> + register uintptr_t a4 asm ("a4") = (uintptr_t)(arg4);
> + register uintptr_t a5 asm ("a5") = (uintptr_t)(arg5);
> + register uintptr_t a6 asm ("a6") = (uintptr_t)(fid);
> + register uintptr_t a7 asm ("a7") = (uintptr_t)(ext);
> + struct sbiret ret;
> +
> + asm volatile (
> + "ecall"
> + : "+r" (a0), "+r" (a1)
> + : "r" (a2), "r" (a3), "r" (a4), "r" (a5), "r" (a6), "r" (a7)
> + : "memory");
> + ret.error = a0;
> + ret.value = a1;
> +
> + return ret;
> +}
> +
> +void ucall(uint64_t cmd, int nargs, ...)
> +{
> + struct ucall uc = {
> + .cmd = cmd,
> + };
> + va_list va;
> + int i;
> +
> + nargs = nargs <= UCALL_MAX_ARGS ? nargs : UCALL_MAX_ARGS;
> +
> + va_start(va, nargs);
> + for (i = 0; i < nargs; ++i)
> + uc.args[i] = va_arg(va, uint64_t);
> + va_end(va);
> +
> + sbi_ecall(KVM_RISCV_SELFTESTS_SBI_EXT, 0, (vm_vaddr_t)&uc,
> + 0, 0, 0, 0, 0);
> +}
> +
> +uint64_t get_ucall(struct kvm_vm *vm, uint32_t vcpu_id, struct ucall *uc)
> +{
> + struct kvm_run *run = vcpu_state(vm, vcpu_id);
> + struct ucall ucall = {};
> +
> + if (uc)
> + memset(uc, 0, sizeof(*uc));
> +
> + if (run->exit_reason == KVM_EXIT_RISCV_SBI &&
> + run->riscv_sbi.extension_id == KVM_RISCV_SELFTESTS_SBI_EXT &&
> + run->riscv_sbi.function_id == 0) {
> + memcpy(&ucall, addr_gva2hva(vm, run->riscv_sbi.args[0]),
> + sizeof(ucall));
> +
> + vcpu_run_complete_io(vm, vcpu_id);
> + if (uc)
> + memcpy(uc, &ucall, sizeof(ucall));
> + }
> +
> + return ucall.cmd;
> +}
> --
> 2.25.1
>
Reviewed-by: Atish Patra <atishp at rivosinc.com>
--
Regards,
Atish
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