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// SPDX-License-Identifier: GPL-2.0-only
#include "test_util.h"
#include "kvm_util.h"
#include "processor.h"
#include "vmx.h"
#include "svm_util.h"
enum {
SVM_F,
VMX_F,
NR_VIRTUALIZATION_FLAVORS,
};
struct emulated_instruction {
const char name[32];
uint8_t opcode[15];
uint32_t exit_reason[NR_VIRTUALIZATION_FLAVORS];
};
static struct emulated_instruction instructions[] = {
{
.name = "pause",
.opcode = { 0xf3, 0x90 },
.exit_reason = { SVM_EXIT_PAUSE,
EXIT_REASON_PAUSE_INSTRUCTION, }
},
{
.name = "hlt",
.opcode = { 0xf4 },
.exit_reason = { SVM_EXIT_HLT,
EXIT_REASON_HLT, }
},
};
static uint8_t kvm_fep[] = { 0x0f, 0x0b, 0x6b, 0x76, 0x6d }; /* ud2 ; .ascii "kvm" */
static uint8_t l2_guest_code[sizeof(kvm_fep) + 15];
static uint8_t *l2_instruction = &l2_guest_code[sizeof(kvm_fep)];
static uint32_t get_instruction_length(struct emulated_instruction *insn)
{
uint32_t i;
for (i = 0; i < ARRAY_SIZE(insn->opcode) && insn->opcode[i]; i++)
;
return i;
}
static void guest_code(void *test_data)
{
int f = this_cpu_has(X86_FEATURE_SVM) ? SVM_F : VMX_F;
int i;
memcpy(l2_guest_code, kvm_fep, sizeof(kvm_fep));
if (f == SVM_F) {
struct svm_test_data *svm = test_data;
struct vmcb *vmcb = svm->vmcb;
generic_svm_setup(svm, NULL, NULL);
vmcb->save.idtr.limit = 0;
vmcb->save.rip = (u64)l2_guest_code;
vmcb->control.intercept |= BIT_ULL(INTERCEPT_SHUTDOWN) |
BIT_ULL(INTERCEPT_PAUSE) |
BIT_ULL(INTERCEPT_HLT);
vmcb->control.intercept_exceptions = 0;
} else {
GUEST_ASSERT(prepare_for_vmx_operation(test_data));
GUEST_ASSERT(load_vmcs(test_data));
prepare_vmcs(test_data, NULL, NULL);
GUEST_ASSERT(!vmwrite(GUEST_IDTR_LIMIT, 0));
GUEST_ASSERT(!vmwrite(GUEST_RIP, (u64)l2_guest_code));
GUEST_ASSERT(!vmwrite(EXCEPTION_BITMAP, 0));
vmwrite(CPU_BASED_VM_EXEC_CONTROL, vmreadz(CPU_BASED_VM_EXEC_CONTROL) |
CPU_BASED_PAUSE_EXITING |
CPU_BASED_HLT_EXITING);
}
for (i = 0; i < ARRAY_SIZE(instructions); i++) {
struct emulated_instruction *insn = &instructions[i];
uint32_t insn_len = get_instruction_length(insn);
uint32_t exit_insn_len;
u32 exit_reason;
/*
* Copy the target instruction to the L2 code stream, and fill
* the remaining bytes with INT3s so that a missed intercept
* results in a consistent failure mode (SHUTDOWN).
*/
memcpy(l2_instruction, insn->opcode, insn_len);
memset(l2_instruction + insn_len, 0xcc, sizeof(insn->opcode) - insn_len);
if (f == SVM_F) {
struct svm_test_data *svm = test_data;
struct vmcb *vmcb = svm->vmcb;
run_guest(vmcb, svm->vmcb_gpa);
exit_reason = vmcb->control.exit_code;
exit_insn_len = vmcb->control.next_rip - vmcb->save.rip;
GUEST_ASSERT_EQ(vmcb->save.rip, (u64)l2_instruction);
} else {
GUEST_ASSERT_EQ(i ? vmresume() : vmlaunch(), 0);
exit_reason = vmreadz(VM_EXIT_REASON);
exit_insn_len = vmreadz(VM_EXIT_INSTRUCTION_LEN);
GUEST_ASSERT_EQ(vmreadz(GUEST_RIP), (u64)l2_instruction);
}
__GUEST_ASSERT(exit_reason == insn->exit_reason[f],
"Wanted exit_reason '0x%x' for '%s', got '0x%x'",
insn->exit_reason[f], insn->name, exit_reason);
__GUEST_ASSERT(exit_insn_len == insn_len,
"Wanted insn_len '%u' for '%s', got '%u'",
insn_len, insn->name, exit_insn_len);
}
GUEST_DONE();
}
int main(int argc, char *argv[])
{
vm_vaddr_t nested_test_data_gva;
struct kvm_vcpu *vcpu;
struct kvm_vm *vm;
TEST_REQUIRE(is_forced_emulation_enabled);
TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_SVM) || kvm_cpu_has(X86_FEATURE_VMX));
vm = vm_create_with_one_vcpu(&vcpu, guest_code);
vm_enable_cap(vm, KVM_CAP_EXCEPTION_PAYLOAD, -2ul);
if (kvm_cpu_has(X86_FEATURE_SVM))
vcpu_alloc_svm(vm, &nested_test_data_gva);
else
vcpu_alloc_vmx(vm, &nested_test_data_gva);
vcpu_args_set(vcpu, 1, nested_test_data_gva);
vcpu_run(vcpu);
TEST_ASSERT_EQ(get_ucall(vcpu, NULL), UCALL_DONE);
kvm_vm_free(vm);
}
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