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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2020, Google LLC.
*
* Test that KVM emulates instructions in response to EPT violations when
* allow_smaller_maxphyaddr is enabled and guest.MAXPHYADDR < host.MAXPHYADDR.
*/
#define _GNU_SOURCE /* for program_invocation_short_name */
#include "flds_emulation.h"
#include "test_util.h"
#include "kvm_util.h"
#include "vmx.h"
#define MAXPHYADDR 36
#define MEM_REGION_GVA 0x0000123456789000
#define MEM_REGION_GPA 0x0000000700000000
#define MEM_REGION_SLOT 10
#define MEM_REGION_SIZE PAGE_SIZE
static void guest_code(bool tdp_enabled)
{
uint64_t error_code;
uint64_t vector;
vector = kvm_asm_safe_ec(FLDS_MEM_EAX, error_code, "a"(MEM_REGION_GVA));
/*
* When TDP is enabled, flds will trigger an emulation failure, exit to
* userspace, and then the selftest host "VMM" skips the instruction.
*
* When TDP is disabled, no instruction emulation is required so flds
* should generate #PF(RSVD).
*/
if (tdp_enabled) {
GUEST_ASSERT(!vector);
} else {
GUEST_ASSERT_EQ(vector, PF_VECTOR);
GUEST_ASSERT(error_code & PFERR_RSVD_MASK);
}
GUEST_DONE();
}
int main(int argc, char *argv[])
{
struct kvm_vcpu *vcpu;
struct kvm_vm *vm;
struct ucall uc;
uint64_t *pte;
uint64_t *hva;
uint64_t gpa;
int rc;
TEST_REQUIRE(kvm_has_cap(KVM_CAP_SMALLER_MAXPHYADDR));
vm = vm_create_with_one_vcpu(&vcpu, guest_code);
vcpu_args_set(vcpu, 1, kvm_is_tdp_enabled());
vm_init_descriptor_tables(vm);
vcpu_init_descriptor_tables(vcpu);
vcpu_set_cpuid_maxphyaddr(vcpu, MAXPHYADDR);
rc = kvm_check_cap(KVM_CAP_EXIT_ON_EMULATION_FAILURE);
TEST_ASSERT(rc, "KVM_CAP_EXIT_ON_EMULATION_FAILURE is unavailable");
vm_enable_cap(vm, KVM_CAP_EXIT_ON_EMULATION_FAILURE, 1);
vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS,
MEM_REGION_GPA, MEM_REGION_SLOT,
MEM_REGION_SIZE / PAGE_SIZE, 0);
gpa = vm_phy_pages_alloc(vm, MEM_REGION_SIZE / PAGE_SIZE,
MEM_REGION_GPA, MEM_REGION_SLOT);
TEST_ASSERT(gpa == MEM_REGION_GPA, "Failed vm_phy_pages_alloc");
virt_map(vm, MEM_REGION_GVA, MEM_REGION_GPA, 1);
hva = addr_gpa2hva(vm, MEM_REGION_GPA);
memset(hva, 0, PAGE_SIZE);
pte = vm_get_page_table_entry(vm, MEM_REGION_GVA);
*pte |= BIT_ULL(MAXPHYADDR);
vcpu_run(vcpu);
/*
* When TDP is enabled, KVM must emulate in response the guest physical
* address that is illegal from the guest's perspective, but is legal
* from hardware's perspeective. This should result in an emulation
* failure exit to userspace since KVM doesn't support emulating flds.
*/
if (kvm_is_tdp_enabled()) {
handle_flds_emulation_failure_exit(vcpu);
vcpu_run(vcpu);
}
switch (get_ucall(vcpu, &uc)) {
case UCALL_ABORT:
REPORT_GUEST_ASSERT(uc);
break;
case UCALL_DONE:
break;
default:
TEST_FAIL("Unrecognized ucall: %lu", uc.cmd);
}
kvm_vm_free(vm);
return 0;
}
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