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Diffstat (limited to 'tools/testing/selftests/kvm/lib/aarch64/ucall.c')
-rw-r--r--tools/testing/selftests/kvm/lib/aarch64/ucall.c112
1 files changed, 0 insertions, 112 deletions
diff --git a/tools/testing/selftests/kvm/lib/aarch64/ucall.c b/tools/testing/selftests/kvm/lib/aarch64/ucall.c
deleted file mode 100644
index c8e0ec20d3bf..000000000000
--- a/tools/testing/selftests/kvm/lib/aarch64/ucall.c
+++ /dev/null
@@ -1,112 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * ucall support. A ucall is a "hypercall to userspace".
- *
- * Copyright (C) 2018, Red Hat, Inc.
- */
-#include "kvm_util.h"
-#include "../kvm_util_internal.h"
-
-static vm_vaddr_t *ucall_exit_mmio_addr;
-
-static bool ucall_mmio_init(struct kvm_vm *vm, vm_paddr_t gpa)
-{
- if (kvm_userspace_memory_region_find(vm, gpa, gpa + 1))
- return false;
-
- virt_pg_map(vm, gpa, gpa, 0);
-
- ucall_exit_mmio_addr = (vm_vaddr_t *)gpa;
- sync_global_to_guest(vm, ucall_exit_mmio_addr);
-
- return true;
-}
-
-void ucall_init(struct kvm_vm *vm, void *arg)
-{
- vm_paddr_t gpa, start, end, step, offset;
- unsigned int bits;
- bool ret;
-
- if (arg) {
- gpa = (vm_paddr_t)arg;
- ret = ucall_mmio_init(vm, gpa);
- TEST_ASSERT(ret, "Can't set ucall mmio address to %lx", gpa);
- return;
- }
-
- /*
- * Find an address within the allowed physical and virtual address
- * spaces, that does _not_ have a KVM memory region associated with
- * it. Identity mapping an address like this allows the guest to
- * access it, but as KVM doesn't know what to do with it, it
- * will assume it's something userspace handles and exit with
- * KVM_EXIT_MMIO. Well, at least that's how it works for AArch64.
- * Here we start with a guess that the addresses around 5/8th
- * of the allowed space are unmapped and then work both down and
- * up from there in 1/16th allowed space sized steps.
- *
- * Note, we need to use VA-bits - 1 when calculating the allowed
- * virtual address space for an identity mapping because the upper
- * half of the virtual address space is the two's complement of the
- * lower and won't match physical addresses.
- */
- bits = vm->va_bits - 1;
- bits = vm->pa_bits < bits ? vm->pa_bits : bits;
- end = 1ul << bits;
- start = end * 5 / 8;
- step = end / 16;
- for (offset = 0; offset < end - start; offset += step) {
- if (ucall_mmio_init(vm, start - offset))
- return;
- if (ucall_mmio_init(vm, start + offset))
- return;
- }
- TEST_FAIL("Can't find a ucall mmio address");
-}
-
-void ucall_uninit(struct kvm_vm *vm)
-{
- ucall_exit_mmio_addr = 0;
- sync_global_to_guest(vm, ucall_exit_mmio_addr);
-}
-
-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);
-
- *ucall_exit_mmio_addr = (vm_vaddr_t)&uc;
-}
-
-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 (run->exit_reason == KVM_EXIT_MMIO &&
- run->mmio.phys_addr == (uint64_t)ucall_exit_mmio_addr) {
- vm_vaddr_t gva;
-
- TEST_ASSERT(run->mmio.is_write && run->mmio.len == 8,
- "Unexpected ucall exit mmio address access");
- memcpy(&gva, run->mmio.data, sizeof(gva));
- memcpy(&ucall, addr_gva2hva(vm, gva), sizeof(ucall));
-
- vcpu_run_complete_io(vm, vcpu_id);
- if (uc)
- memcpy(uc, &ucall, sizeof(ucall));
- }
-
- return ucall.cmd;
-}