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// SPDX-License-Identifier: GPL-2.0-only
/*
* KVM selftest s390x library code - CPU-related functions (page tables...)
*
* Copyright (C) 2019, Red Hat, Inc.
*/
#define _GNU_SOURCE /* for program_invocation_name */
#include "processor.h"
#include "kvm_util.h"
#include "../kvm_util_internal.h"
#define KVM_GUEST_PAGE_TABLE_MIN_PADDR 0x180000
#define PAGES_PER_REGION 4
void virt_pgd_alloc(struct kvm_vm *vm, uint32_t memslot)
{
vm_paddr_t paddr;
TEST_ASSERT(vm->page_size == 4096, "Unsupported page size: 0x%x",
vm->page_size);
if (vm->pgd_created)
return;
paddr = vm_phy_pages_alloc(vm, PAGES_PER_REGION,
KVM_GUEST_PAGE_TABLE_MIN_PADDR, memslot);
memset(addr_gpa2hva(vm, paddr), 0xff, PAGES_PER_REGION * vm->page_size);
vm->pgd = paddr;
vm->pgd_created = true;
}
/*
* Allocate 4 pages for a region/segment table (ri < 4), or one page for
* a page table (ri == 4). Returns a suitable region/segment table entry
* which points to the freshly allocated pages.
*/
static uint64_t virt_alloc_region(struct kvm_vm *vm, int ri, uint32_t memslot)
{
uint64_t taddr;
taddr = vm_phy_pages_alloc(vm, ri < 4 ? PAGES_PER_REGION : 1,
KVM_GUEST_PAGE_TABLE_MIN_PADDR, memslot);
memset(addr_gpa2hva(vm, taddr), 0xff, PAGES_PER_REGION * vm->page_size);
return (taddr & REGION_ENTRY_ORIGIN)
| (((4 - ri) << 2) & REGION_ENTRY_TYPE)
| ((ri < 4 ? (PAGES_PER_REGION - 1) : 0) & REGION_ENTRY_LENGTH);
}
void virt_pg_map(struct kvm_vm *vm, uint64_t gva, uint64_t gpa,
uint32_t memslot)
{
int ri, idx;
uint64_t *entry;
TEST_ASSERT((gva % vm->page_size) == 0,
"Virtual address not on page boundary,\n"
" vaddr: 0x%lx vm->page_size: 0x%x",
gva, vm->page_size);
TEST_ASSERT(sparsebit_is_set(vm->vpages_valid,
(gva >> vm->page_shift)),
"Invalid virtual address, vaddr: 0x%lx",
gva);
TEST_ASSERT((gpa % vm->page_size) == 0,
"Physical address not on page boundary,\n"
" paddr: 0x%lx vm->page_size: 0x%x",
gva, vm->page_size);
TEST_ASSERT((gpa >> vm->page_shift) <= vm->max_gfn,
"Physical address beyond beyond maximum supported,\n"
" paddr: 0x%lx vm->max_gfn: 0x%lx vm->page_size: 0x%x",
gva, vm->max_gfn, vm->page_size);
/* Walk through region and segment tables */
entry = addr_gpa2hva(vm, vm->pgd);
for (ri = 1; ri <= 4; ri++) {
idx = (gva >> (64 - 11 * ri)) & 0x7ffu;
if (entry[idx] & REGION_ENTRY_INVALID)
entry[idx] = virt_alloc_region(vm, ri, memslot);
entry = addr_gpa2hva(vm, entry[idx] & REGION_ENTRY_ORIGIN);
}
/* Fill in page table entry */
idx = (gva >> 12) & 0x0ffu; /* page index */
if (!(entry[idx] & PAGE_INVALID))
fprintf(stderr,
"WARNING: PTE for gpa=0x%"PRIx64" already set!\n", gpa);
entry[idx] = gpa;
}
vm_paddr_t addr_gva2gpa(struct kvm_vm *vm, vm_vaddr_t gva)
{
int ri, idx;
uint64_t *entry;
TEST_ASSERT(vm->page_size == 4096, "Unsupported page size: 0x%x",
vm->page_size);
entry = addr_gpa2hva(vm, vm->pgd);
for (ri = 1; ri <= 4; ri++) {
idx = (gva >> (64 - 11 * ri)) & 0x7ffu;
TEST_ASSERT(!(entry[idx] & REGION_ENTRY_INVALID),
"No region mapping for vm virtual address 0x%lx",
gva);
entry = addr_gpa2hva(vm, entry[idx] & REGION_ENTRY_ORIGIN);
}
idx = (gva >> 12) & 0x0ffu; /* page index */
TEST_ASSERT(!(entry[idx] & PAGE_INVALID),
"No page mapping for vm virtual address 0x%lx", gva);
return (entry[idx] & ~0xffful) + (gva & 0xffful);
}
static void virt_dump_ptes(FILE *stream, struct kvm_vm *vm, uint8_t indent,
uint64_t ptea_start)
{
uint64_t *pte, ptea;
for (ptea = ptea_start; ptea < ptea_start + 0x100 * 8; ptea += 8) {
pte = addr_gpa2hva(vm, ptea);
if (*pte & PAGE_INVALID)
continue;
fprintf(stream, "%*spte @ 0x%lx: 0x%016lx\n",
indent, "", ptea, *pte);
}
}
static void virt_dump_region(FILE *stream, struct kvm_vm *vm, uint8_t indent,
uint64_t reg_tab_addr)
{
uint64_t addr, *entry;
for (addr = reg_tab_addr; addr < reg_tab_addr + 0x400 * 8; addr += 8) {
entry = addr_gpa2hva(vm, addr);
if (*entry & REGION_ENTRY_INVALID)
continue;
fprintf(stream, "%*srt%lde @ 0x%lx: 0x%016lx\n",
indent, "", 4 - ((*entry & REGION_ENTRY_TYPE) >> 2),
addr, *entry);
if (*entry & REGION_ENTRY_TYPE) {
virt_dump_region(stream, vm, indent + 2,
*entry & REGION_ENTRY_ORIGIN);
} else {
virt_dump_ptes(stream, vm, indent + 2,
*entry & REGION_ENTRY_ORIGIN);
}
}
}
void virt_dump(FILE *stream, struct kvm_vm *vm, uint8_t indent)
{
if (!vm->pgd_created)
return;
virt_dump_region(stream, vm, indent, vm->pgd);
}
struct kvm_vm *vm_create_default(uint32_t vcpuid, uint64_t extra_mem_pages,
void *guest_code)
{
/*
* The additional amount of pages required for the page tables is:
* 1 * n / 256 + 4 * (n / 256) / 2048 + 4 * (n / 256) / 2048^2 + ...
* which is definitely smaller than (n / 256) * 2.
*/
uint64_t extra_pg_pages = extra_mem_pages / 256 * 2;
struct kvm_vm *vm;
vm = vm_create(VM_MODE_DEFAULT,
DEFAULT_GUEST_PHY_PAGES + extra_pg_pages, O_RDWR);
kvm_vm_elf_load(vm, program_invocation_name, 0, 0);
vm_vcpu_add_default(vm, vcpuid, guest_code);
return vm;
}
void vm_vcpu_add_default(struct kvm_vm *vm, uint32_t vcpuid, void *guest_code)
{
size_t stack_size = DEFAULT_STACK_PGS * getpagesize();
uint64_t stack_vaddr;
struct kvm_regs regs;
struct kvm_sregs sregs;
struct kvm_run *run;
TEST_ASSERT(vm->page_size == 4096, "Unsupported page size: 0x%x",
vm->page_size);
stack_vaddr = vm_vaddr_alloc(vm, stack_size,
DEFAULT_GUEST_STACK_VADDR_MIN, 0, 0);
vm_vcpu_add(vm, vcpuid);
/* Setup guest registers */
vcpu_regs_get(vm, vcpuid, ®s);
regs.gprs[15] = stack_vaddr + (DEFAULT_STACK_PGS * getpagesize()) - 160;
vcpu_regs_set(vm, vcpuid, ®s);
vcpu_sregs_get(vm, vcpuid, &sregs);
sregs.crs[0] |= 0x00040000; /* Enable floating point regs */
sregs.crs[1] = vm->pgd | 0xf; /* Primary region table */
vcpu_sregs_set(vm, vcpuid, &sregs);
run = vcpu_state(vm, vcpuid);
run->psw_mask = 0x0400000180000000ULL; /* DAT enabled + 64 bit mode */
run->psw_addr = (uintptr_t)guest_code;
}
void vcpu_args_set(struct kvm_vm *vm, uint32_t vcpuid, 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(vm, vcpuid, ®s);
for (i = 0; i < num; i++)
regs.gprs[i + 2] = va_arg(ap, uint64_t);
vcpu_regs_set(vm, vcpuid, ®s);
va_end(ap);
}
void vcpu_dump(FILE *stream, struct kvm_vm *vm, uint32_t vcpuid, uint8_t indent)
{
struct vcpu *vcpu = vcpu_find(vm, vcpuid);
if (!vcpu)
return;
fprintf(stream, "%*spstate: psw: 0x%.16llx:0x%.16llx\n",
indent, "", vcpu->state->psw_mask, vcpu->state->psw_addr);
}
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