From f57a4dd31154e9c054fe75d4ab27829033720a8d Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Tue, 17 Oct 2023 13:15:11 +0200
Subject: [PATCH] kvm: i386: require KVM_CAP_DEBUGREGS

This was introduced in KVM in Linux 2.6.35, we can require it unconditionally.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 accel/kvm/kvm-all.c      | 9 ---------
 include/sysemu/kvm.h     | 1 -
 include/sysemu/kvm_int.h | 1 -
 target/i386/kvm/kvm.c    | 9 +--------
 4 files changed, 1 insertion(+), 19 deletions(-)

diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index b59a48da92..aeda902b3e 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -2528,10 +2528,6 @@ static int kvm_init(MachineState *ms)
     s->robust_singlestep =
         kvm_check_extension(s, KVM_CAP_X86_ROBUST_SINGLESTEP);
 
-#ifdef KVM_CAP_DEBUGREGS
-    s->debugregs = kvm_check_extension(s, KVM_CAP_DEBUGREGS);
-#endif
-
     s->max_nested_state_len = kvm_check_extension(s, KVM_CAP_NESTED_STATE);
 
     s->irq_set_ioctl = KVM_IRQ_LINE;
@@ -3152,11 +3148,6 @@ int kvm_has_robust_singlestep(void)
     return kvm_state->robust_singlestep;
 }
 
-int kvm_has_debugregs(void)
-{
-    return kvm_state->debugregs;
-}
-
 int kvm_max_nested_state_length(void)
 {
     return kvm_state->max_nested_state_len;
diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h
index 31c03cc193..02c031d1f2 100644
--- a/include/sysemu/kvm.h
+++ b/include/sysemu/kvm.h
@@ -193,7 +193,6 @@ unsigned int kvm_get_free_memslots(void);
 bool kvm_has_sync_mmu(void);
 int kvm_has_vcpu_events(void);
 int kvm_has_robust_singlestep(void);
-int kvm_has_debugregs(void);
 int kvm_max_nested_state_length(void);
 int kvm_has_gsi_routing(void);
 
diff --git a/include/sysemu/kvm_int.h b/include/sysemu/kvm_int.h
index 840b905a2e..151ecc8423 100644
--- a/include/sysemu/kvm_int.h
+++ b/include/sysemu/kvm_int.h
@@ -79,7 +79,6 @@ struct KVMState
     bool coalesced_flush_in_progress;
     int vcpu_events;
     int robust_singlestep;
-    int debugregs;
 #ifdef KVM_CAP_SET_GUEST_DEBUG
     QTAILQ_HEAD(, kvm_sw_breakpoint) kvm_sw_breakpoints;
 #endif
diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c
index 94b2516c29..b8fb74d7f1 100644
--- a/target/i386/kvm/kvm.c
+++ b/target/i386/kvm/kvm.c
@@ -93,6 +93,7 @@ const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
     KVM_CAP_INFO(MP_STATE),
     KVM_CAP_INFO(SIGNAL_MSI),
     KVM_CAP_INFO(IRQ_ROUTING),
+    KVM_CAP_INFO(DEBUGREGS),
     KVM_CAP_LAST_INFO
 };
 
@@ -4601,10 +4602,6 @@ static int kvm_put_debugregs(X86CPU *cpu)
     struct kvm_debugregs dbgregs;
     int i;
 
-    if (!kvm_has_debugregs()) {
-        return 0;
-    }
-
     memset(&dbgregs, 0, sizeof(dbgregs));
     for (i = 0; i < 4; i++) {
         dbgregs.db[i] = env->dr[i];
@@ -4622,10 +4619,6 @@ static int kvm_get_debugregs(X86CPU *cpu)
     struct kvm_debugregs dbgregs;
     int i, ret;
 
-    if (!kvm_has_debugregs()) {
-        return 0;
-    }
-
     ret = kvm_vcpu_ioctl(CPU(cpu), KVM_GET_DEBUGREGS, &dbgregs);
     if (ret < 0) {
         return ret;
-- 
2.30.2