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// SPDX-License-Identifier: GPL-2.0
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include "kvm_util.h"
#include "processor.h"
#define CPUID_MWAIT (1u << 3)
enum monitor_mwait_testcases {
MWAIT_QUIRK_DISABLED = BIT(0),
MISC_ENABLES_QUIRK_DISABLED = BIT(1),
MWAIT_DISABLED = BIT(2),
};
static void guest_monitor_wait(int testcase)
{
/*
* If both MWAIT and its quirk are disabled, MONITOR/MWAIT should #UD,
* in all other scenarios KVM should emulate them as nops.
*/
bool fault_wanted = (testcase & MWAIT_QUIRK_DISABLED) &&
(testcase & MWAIT_DISABLED);
u8 vector;
GUEST_SYNC(testcase);
/*
* Arbitrarily MONITOR this function, SVM performs fault checks before
* intercept checks, so the inputs for MONITOR and MWAIT must be valid.
*/
vector = kvm_asm_safe("monitor", "a"(guest_monitor_wait), "c"(0), "d"(0));
if (fault_wanted)
GUEST_ASSERT_2(vector == UD_VECTOR, testcase, vector);
else
GUEST_ASSERT_2(!vector, testcase, vector);
vector = kvm_asm_safe("mwait", "a"(guest_monitor_wait), "c"(0), "d"(0));
if (fault_wanted)
GUEST_ASSERT_2(vector == UD_VECTOR, testcase, vector);
else
GUEST_ASSERT_2(!vector, testcase, vector);
}
static void guest_code(void)
{
guest_monitor_wait(MWAIT_DISABLED);
guest_monitor_wait(MWAIT_QUIRK_DISABLED | MWAIT_DISABLED);
guest_monitor_wait(MISC_ENABLES_QUIRK_DISABLED | MWAIT_DISABLED);
guest_monitor_wait(MISC_ENABLES_QUIRK_DISABLED);
guest_monitor_wait(MISC_ENABLES_QUIRK_DISABLED | MWAIT_QUIRK_DISABLED | MWAIT_DISABLED);
guest_monitor_wait(MISC_ENABLES_QUIRK_DISABLED | MWAIT_QUIRK_DISABLED);
GUEST_DONE();
}
int main(int argc, char *argv[])
{
uint64_t disabled_quirks;
struct kvm_vcpu *vcpu;
struct kvm_run *run;
struct kvm_vm *vm;
struct ucall uc;
int testcase;
TEST_REQUIRE(kvm_has_cap(KVM_CAP_DISABLE_QUIRKS2));
vm = vm_create_with_one_vcpu(&vcpu, guest_code);
vcpu_clear_cpuid_feature(vcpu, X86_FEATURE_MWAIT);
run = vcpu->run;
vm_init_descriptor_tables(vm);
vcpu_init_descriptor_tables(vcpu);
while (1) {
vcpu_run(vcpu);
TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
"Unexpected exit reason: %u (%s),\n",
run->exit_reason,
exit_reason_str(run->exit_reason));
switch (get_ucall(vcpu, &uc)) {
case UCALL_SYNC:
testcase = uc.args[1];
break;
case UCALL_ABORT:
REPORT_GUEST_ASSERT_2(uc, "testcase = %lx, vector = %ld");
goto done;
case UCALL_DONE:
goto done;
default:
TEST_FAIL("Unknown ucall %lu", uc.cmd);
goto done;
}
disabled_quirks = 0;
if (testcase & MWAIT_QUIRK_DISABLED)
disabled_quirks |= KVM_X86_QUIRK_MWAIT_NEVER_UD_FAULTS;
if (testcase & MISC_ENABLES_QUIRK_DISABLED)
disabled_quirks |= KVM_X86_QUIRK_MISC_ENABLE_NO_MWAIT;
vm_enable_cap(vm, KVM_CAP_DISABLE_QUIRKS2, disabled_quirks);
/*
* If the MISC_ENABLES quirk (KVM neglects to update CPUID to
* enable/disable MWAIT) is disabled, toggle the ENABLE_MWAIT
* bit in MISC_ENABLES accordingly. If the quirk is enabled,
* the only valid configuration is MWAIT disabled, as CPUID
* can't be manually changed after running the vCPU.
*/
if (!(testcase & MISC_ENABLES_QUIRK_DISABLED)) {
TEST_ASSERT(testcase & MWAIT_DISABLED,
"Can't toggle CPUID features after running vCPU");
continue;
}
vcpu_set_msr(vcpu, MSR_IA32_MISC_ENABLE,
(testcase & MWAIT_DISABLED) ? 0 : MSR_IA32_MISC_ENABLE_MWAIT);
}
done:
kvm_vm_free(vm);
return 0;
}
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