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// SPDX-License-Identifier: GPL-2.0-only
/*
* KVM_GET/SET_* tests
*
* Copyright (C) 2022, Red Hat, Inc.
*
* Tests for Hyper-V extensions to SVM.
*/
#define _GNU_SOURCE /* for program_invocation_short_name */
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <linux/bitmap.h>
#include "test_util.h"
#include "kvm_util.h"
#include "processor.h"
#include "svm_util.h"
#include "hyperv.h"
#define L2_GUEST_STACK_SIZE 256
struct hv_enlightenments {
struct __packed hv_enlightenments_control {
u32 nested_flush_hypercall:1;
u32 msr_bitmap:1;
u32 enlightened_npt_tlb: 1;
u32 reserved:29;
} __packed hv_enlightenments_control;
u32 hv_vp_id;
u64 hv_vm_id;
u64 partition_assist_page;
u64 reserved;
} __packed;
/*
* Hyper-V uses the software reserved clean bit in VMCB
*/
#define VMCB_HV_NESTED_ENLIGHTENMENTS (1U << 31)
void l2_guest_code(void)
{
GUEST_SYNC(3);
/* Exit to L1 */
vmmcall();
/* MSR-Bitmap tests */
rdmsr(MSR_FS_BASE); /* intercepted */
rdmsr(MSR_FS_BASE); /* intercepted */
rdmsr(MSR_GS_BASE); /* not intercepted */
vmmcall();
rdmsr(MSR_GS_BASE); /* intercepted */
GUEST_SYNC(5);
/* Done, exit to L1 and never come back. */
vmmcall();
}
static void __attribute__((__flatten__)) guest_code(struct svm_test_data *svm)
{
unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
struct vmcb *vmcb = svm->vmcb;
struct hv_enlightenments *hve =
(struct hv_enlightenments *)vmcb->control.reserved_sw;
GUEST_SYNC(1);
wrmsr(HV_X64_MSR_GUEST_OS_ID, (u64)0x8100 << 48);
GUEST_ASSERT(svm->vmcb_gpa);
/* Prepare for L2 execution. */
generic_svm_setup(svm, l2_guest_code,
&l2_guest_stack[L2_GUEST_STACK_SIZE]);
GUEST_SYNC(2);
run_guest(vmcb, svm->vmcb_gpa);
GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_VMMCALL);
GUEST_SYNC(4);
vmcb->save.rip += 3;
/* Intercept RDMSR 0xc0000100 */
vmcb->control.intercept |= 1ULL << INTERCEPT_MSR_PROT;
set_bit(2 * (MSR_FS_BASE & 0x1fff), svm->msr + 0x800);
run_guest(vmcb, svm->vmcb_gpa);
GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_MSR);
vmcb->save.rip += 2; /* rdmsr */
/* Enable enlightened MSR bitmap */
hve->hv_enlightenments_control.msr_bitmap = 1;
run_guest(vmcb, svm->vmcb_gpa);
GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_MSR);
vmcb->save.rip += 2; /* rdmsr */
/* Intercept RDMSR 0xc0000101 without telling KVM about it */
set_bit(2 * (MSR_GS_BASE & 0x1fff), svm->msr + 0x800);
/* Make sure HV_VMX_ENLIGHTENED_CLEAN_FIELD_MSR_BITMAP is set */
vmcb->control.clean |= VMCB_HV_NESTED_ENLIGHTENMENTS;
run_guest(vmcb, svm->vmcb_gpa);
/* Make sure we don't see SVM_EXIT_MSR here so eMSR bitmap works */
GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_VMMCALL);
vmcb->save.rip += 3; /* vmcall */
/* Now tell KVM we've changed MSR-Bitmap */
vmcb->control.clean &= ~VMCB_HV_NESTED_ENLIGHTENMENTS;
run_guest(vmcb, svm->vmcb_gpa);
GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_MSR);
vmcb->save.rip += 2; /* rdmsr */
run_guest(vmcb, svm->vmcb_gpa);
GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_VMMCALL);
GUEST_SYNC(6);
GUEST_DONE();
}
int main(int argc, char *argv[])
{
vm_vaddr_t nested_gva = 0;
struct kvm_vcpu *vcpu;
struct kvm_vm *vm;
struct kvm_run *run;
struct ucall uc;
int stage;
TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_SVM));
/* Create VM */
vm = vm_create_with_one_vcpu(&vcpu, guest_code);
vcpu_set_hv_cpuid(vcpu);
run = vcpu->run;
vcpu_alloc_svm(vm, &nested_gva);
vcpu_args_set(vcpu, 1, nested_gva);
for (stage = 1;; stage++) {
vcpu_run(vcpu);
TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
"Stage %d: unexpected exit reason: %u (%s),\n",
stage, run->exit_reason,
exit_reason_str(run->exit_reason));
switch (get_ucall(vcpu, &uc)) {
case UCALL_ABORT:
REPORT_GUEST_ASSERT(uc);
/* NOT REACHED */
case UCALL_SYNC:
break;
case UCALL_DONE:
goto done;
default:
TEST_FAIL("Unknown ucall %lu", uc.cmd);
}
/* UCALL_SYNC is handled here. */
TEST_ASSERT(!strcmp((const char *)uc.args[0], "hello") &&
uc.args[1] == stage, "Stage %d: Unexpected register values vmexit, got %lx",
stage, (ulong)uc.args[1]);
}
done:
kvm_vm_free(vm);
}
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