diff options
Diffstat (limited to 'tools/testing/selftests/kvm/x86_64/kvm_pv_test.c')
| -rw-r--r-- | tools/testing/selftests/kvm/x86_64/kvm_pv_test.c | 234 |
1 files changed, 0 insertions, 234 deletions
diff --git a/tools/testing/selftests/kvm/x86_64/kvm_pv_test.c b/tools/testing/selftests/kvm/x86_64/kvm_pv_test.c deleted file mode 100644 index 04ed975662c9..000000000000 --- a/tools/testing/selftests/kvm/x86_64/kvm_pv_test.c +++ /dev/null @@ -1,234 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * Copyright (C) 2020, Google LLC. - * - * Tests for KVM paravirtual feature disablement - */ -#include <asm/kvm_para.h> -#include <linux/kvm_para.h> -#include <stdint.h> - -#include "test_util.h" -#include "kvm_util.h" -#include "processor.h" - -extern unsigned char rdmsr_start; -extern unsigned char rdmsr_end; - -static u64 do_rdmsr(u32 idx) -{ - u32 lo, hi; - - asm volatile("rdmsr_start: rdmsr;" - "rdmsr_end:" - : "=a"(lo), "=c"(hi) - : "c"(idx)); - - return (((u64) hi) << 32) | lo; -} - -extern unsigned char wrmsr_start; -extern unsigned char wrmsr_end; - -static void do_wrmsr(u32 idx, u64 val) -{ - u32 lo, hi; - - lo = val; - hi = val >> 32; - - asm volatile("wrmsr_start: wrmsr;" - "wrmsr_end:" - : : "a"(lo), "c"(idx), "d"(hi)); -} - -static int nr_gp; - -static void guest_gp_handler(struct ex_regs *regs) -{ - unsigned char *rip = (unsigned char *)regs->rip; - bool r, w; - - r = rip == &rdmsr_start; - w = rip == &wrmsr_start; - GUEST_ASSERT(r || w); - - nr_gp++; - - if (r) - regs->rip = (uint64_t)&rdmsr_end; - else - regs->rip = (uint64_t)&wrmsr_end; -} - -struct msr_data { - uint32_t idx; - const char *name; -}; - -#define TEST_MSR(msr) { .idx = msr, .name = #msr } -#define UCALL_PR_MSR 0xdeadbeef -#define PR_MSR(msr) ucall(UCALL_PR_MSR, 1, msr) - -/* - * KVM paravirtual msrs to test. Expect a #GP if any of these msrs are read or - * written, as the KVM_CPUID_FEATURES leaf is cleared. - */ -static struct msr_data msrs_to_test[] = { - TEST_MSR(MSR_KVM_SYSTEM_TIME), - TEST_MSR(MSR_KVM_SYSTEM_TIME_NEW), - TEST_MSR(MSR_KVM_WALL_CLOCK), - TEST_MSR(MSR_KVM_WALL_CLOCK_NEW), - TEST_MSR(MSR_KVM_ASYNC_PF_EN), - TEST_MSR(MSR_KVM_STEAL_TIME), - TEST_MSR(MSR_KVM_PV_EOI_EN), - TEST_MSR(MSR_KVM_POLL_CONTROL), - TEST_MSR(MSR_KVM_ASYNC_PF_INT), - TEST_MSR(MSR_KVM_ASYNC_PF_ACK), -}; - -static void test_msr(struct msr_data *msr) -{ - PR_MSR(msr); - do_rdmsr(msr->idx); - GUEST_ASSERT(READ_ONCE(nr_gp) == 1); - - nr_gp = 0; - do_wrmsr(msr->idx, 0); - GUEST_ASSERT(READ_ONCE(nr_gp) == 1); - nr_gp = 0; -} - -struct hcall_data { - uint64_t nr; - const char *name; -}; - -#define TEST_HCALL(hc) { .nr = hc, .name = #hc } -#define UCALL_PR_HCALL 0xdeadc0de -#define PR_HCALL(hc) ucall(UCALL_PR_HCALL, 1, hc) - -/* - * KVM hypercalls to test. Expect -KVM_ENOSYS when called, as the corresponding - * features have been cleared in KVM_CPUID_FEATURES. - */ -static struct hcall_data hcalls_to_test[] = { - TEST_HCALL(KVM_HC_KICK_CPU), - TEST_HCALL(KVM_HC_SEND_IPI), - TEST_HCALL(KVM_HC_SCHED_YIELD), -}; - -static void test_hcall(struct hcall_data *hc) -{ - uint64_t r; - - PR_HCALL(hc); - r = kvm_hypercall(hc->nr, 0, 0, 0, 0); - GUEST_ASSERT(r == -KVM_ENOSYS); -} - -static void guest_main(void) -{ - int i; - - for (i = 0; i < ARRAY_SIZE(msrs_to_test); i++) { - test_msr(&msrs_to_test[i]); - } - - for (i = 0; i < ARRAY_SIZE(hcalls_to_test); i++) { - test_hcall(&hcalls_to_test[i]); - } - - GUEST_DONE(); -} - -static void clear_kvm_cpuid_features(struct kvm_cpuid2 *cpuid) -{ - struct kvm_cpuid_entry2 ent = {0}; - - ent.function = KVM_CPUID_FEATURES; - TEST_ASSERT(set_cpuid(cpuid, &ent), - "failed to clear KVM_CPUID_FEATURES leaf"); -} - -static void pr_msr(struct ucall *uc) -{ - struct msr_data *msr = (struct msr_data *)uc->args[0]; - - pr_info("testing msr: %s (%#x)\n", msr->name, msr->idx); -} - -static void pr_hcall(struct ucall *uc) -{ - struct hcall_data *hc = (struct hcall_data *)uc->args[0]; - - pr_info("testing hcall: %s (%lu)\n", hc->name, hc->nr); -} - -static void handle_abort(struct ucall *uc) -{ - TEST_FAIL("%s at %s:%ld", (const char *)uc->args[0], - __FILE__, uc->args[1]); -} - -#define VCPU_ID 0 - -static void enter_guest(struct kvm_vm *vm) -{ - struct kvm_run *run; - struct ucall uc; - int r; - - run = vcpu_state(vm, VCPU_ID); - - while (true) { - r = _vcpu_run(vm, VCPU_ID); - TEST_ASSERT(!r, "vcpu_run failed: %d\n", r); - TEST_ASSERT(run->exit_reason == KVM_EXIT_IO, - "unexpected exit reason: %u (%s)", - run->exit_reason, exit_reason_str(run->exit_reason)); - - switch (get_ucall(vm, VCPU_ID, &uc)) { - case UCALL_PR_MSR: - pr_msr(&uc); - break; - case UCALL_PR_HCALL: - pr_hcall(&uc); - break; - case UCALL_ABORT: - handle_abort(&uc); - return; - case UCALL_DONE: - return; - } - } -} - -int main(void) -{ - struct kvm_enable_cap cap = {0}; - struct kvm_cpuid2 *best; - struct kvm_vm *vm; - - if (!kvm_check_cap(KVM_CAP_ENFORCE_PV_FEATURE_CPUID)) { - print_skip("KVM_CAP_ENFORCE_PV_FEATURE_CPUID not supported"); - exit(KSFT_SKIP); - } - - vm = vm_create_default(VCPU_ID, 0, guest_main); - - cap.cap = KVM_CAP_ENFORCE_PV_FEATURE_CPUID; - cap.args[0] = 1; - vcpu_enable_cap(vm, VCPU_ID, &cap); - - best = kvm_get_supported_cpuid(); - clear_kvm_cpuid_features(best); - vcpu_set_cpuid(vm, VCPU_ID, best); - - vm_init_descriptor_tables(vm); - vcpu_init_descriptor_tables(vm, VCPU_ID); - vm_install_exception_handler(vm, GP_VECTOR, guest_gp_handler); - - enter_guest(vm); - kvm_vm_free(vm); -} |