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kvm: i386: require KVM_CAP_SET_VCPU_EVENTS and KVM_CAP_X86_ROBUST_SINGLESTEP

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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2023-10-17 14:16:58 +02:00
parent 8bba0a3b76
commit 1a44a79ddf
4 changed files with 2 additions and 101 deletions
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92
target/i386/kvm/kvm.c
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@ -95,6 +95,8 @@ const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
KVM_CAP_INFO(IRQ_ROUTING),
KVM_CAP_INFO(DEBUGREGS),
KVM_CAP_INFO(XSAVE),
KVM_CAP_INFO(VCPU_EVENTS),
KVM_CAP_INFO(X86_ROBUST_SINGLESTEP),
KVM_CAP_LAST_INFO
};
@ -690,15 +692,6 @@ void kvm_arch_on_sigbus_vcpu(CPUState *c, int code, void *addr)
emit_hypervisor_memory_failure(MEMORY_FAILURE_ACTION_IGNORE, false);
}
static void kvm_reset_exception(CPUX86State *env)
{
env->exception_nr = -1;
env->exception_pending = 0;
env->exception_injected = 0;
env->exception_has_payload = false;
env->exception_payload = 0;
}
static void kvm_queue_exception(CPUX86State *env,
int32_t exception_nr,
uint8_t exception_has_payload,
@ -731,38 +724,6 @@ static void kvm_queue_exception(CPUX86State *env,
}
}
static int kvm_inject_mce_oldstyle(X86CPU *cpu)
{
CPUX86State *env = &cpu->env;
if (!kvm_has_vcpu_events() && env->exception_nr == EXCP12_MCHK) {
unsigned int bank, bank_num = env->mcg_cap & 0xff;
struct kvm_x86_mce mce;
kvm_reset_exception(env);
/*
* There must be at least one bank in use if an MCE is pending.
* Find it and use its values for the event injection.
*/
for (bank = 0; bank < bank_num; bank++) {
if (env->mce_banks[bank * 4 + 1] & MCI_STATUS_VAL) {
break;
}
}
assert(bank < bank_num);
mce.bank = bank;
mce.status = env->mce_banks[bank * 4 + 1];
mce.mcg_status = env->mcg_status;
mce.addr = env->mce_banks[bank * 4 + 2];
mce.misc = env->mce_banks[bank * 4 + 3];
return kvm_vcpu_ioctl(CPU(cpu), KVM_X86_SET_MCE, &mce);
}
return 0;
}
static void cpu_update_state(void *opaque, bool running, RunState state)
{
CPUX86State *env = opaque;
@ -4359,10 +4320,6 @@ static int kvm_put_vcpu_events(X86CPU *cpu, int level)
CPUX86State *env = &cpu->env;
struct kvm_vcpu_events events = {};
if (!kvm_has_vcpu_events()) {
return 0;
}
events.flags = 0;
if (has_exception_payload) {
@ -4430,10 +4387,6 @@ static int kvm_get_vcpu_events(X86CPU *cpu)
struct kvm_vcpu_events events;
int ret;
if (!kvm_has_vcpu_events()) {
return 0;
}
memset(&events, 0, sizeof(events));
ret = kvm_vcpu_ioctl(CPU(cpu), KVM_GET_VCPU_EVENTS, &events);
if (ret < 0) {
@ -4499,37 +4452,6 @@ static int kvm_get_vcpu_events(X86CPU *cpu)
return 0;
}
static int kvm_guest_debug_workarounds(X86CPU *cpu)
{
CPUState *cs = CPU(cpu);
CPUX86State *env = &cpu->env;
int ret = 0;
unsigned long reinject_trap = 0;
if (!kvm_has_vcpu_events()) {
if (env->exception_nr == EXCP01_DB) {
reinject_trap = KVM_GUESTDBG_INJECT_DB;
} else if (env->exception_injected == EXCP03_INT3) {
reinject_trap = KVM_GUESTDBG_INJECT_BP;
}
kvm_reset_exception(env);
}
/*
* Kernels before KVM_CAP_X86_ROBUST_SINGLESTEP overwrote flags.TF
* injected via SET_GUEST_DEBUG while updating GP regs. Work around this
* by updating the debug state once again if single-stepping is on.
* Another reason to call kvm_update_guest_debug here is a pending debug
* trap raise by the guest. On kernels without SET_VCPU_EVENTS we have to
* reinject them via SET_GUEST_DEBUG.
*/
if (reinject_trap ||
(!kvm_has_robust_singlestep() && cs->singlestep_enabled)) {
ret = kvm_update_guest_debug(cs, reinject_trap);
}
return ret;
}
static int kvm_put_debugregs(X86CPU *cpu)
{
CPUX86State *env = &cpu->env;
@ -4702,11 +4624,6 @@ int kvm_arch_put_registers(CPUState *cpu, int level)
if (ret < 0) {
return ret;
}
/* must be before kvm_put_msrs */
ret = kvm_inject_mce_oldstyle(x86_cpu);
if (ret < 0) {
return ret;
}
ret = kvm_put_msrs(x86_cpu, level);
if (ret < 0) {
return ret;
@ -4730,11 +4647,6 @@ int kvm_arch_put_registers(CPUState *cpu, int level)
if (ret < 0) {
return ret;
}
/* must be last */
ret = kvm_guest_debug_workarounds(x86_cpu);
if (ret < 0) {
return ret;
}
return 0;
}