From 66f0338778a3f0086e1a3fa9c945efcf6bb39872 Mon Sep 17 00:00:00 2001
From: Jia Qingtong <jiaqingtong@huawei.com>
Date: Tue, 30 Dec 2025 09:42:47 +0800
Subject: [PATCH] target/arm: support the IPIV feature

virt inclusion
category: feature
bugzilla: https://gitee.com/openeuler/qemu/issues/IC1EV7

------------------------------------------------------------------------

QEMU uses ioctl to enable IPIV.

Signed-off-by: Jinqian Yang <yangjinqian1@huawei.com>
Signed-off-by: Jia Qingtong <jiaqingtong@huawei.com>
---
 linux-headers/linux/kvm.h |  1 +
 target/arm/kvm.c          | 18 ++++++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/linux-headers/linux/kvm.h b/linux-headers/linux/kvm.h
index fa22d85adf..159b685c6f 100644
--- a/linux-headers/linux/kvm.h
+++ b/linux-headers/linux/kvm.h
@@ -1130,6 +1130,7 @@ struct kvm_ppc_resize_hpt {
 #define KVM_CAP_ARM_CPU_FEATURE 555
 #define KVM_CAP_ARM_TMM 300
 
+#define KVM_CAP_ARM_HISI_IPIV 798
 #define KVM_CAP_ARM_VIRT_MSI_BYPASS 799
 
 #ifdef KVM_CAP_IRQ_ROUTING
diff --git a/target/arm/kvm.c b/target/arm/kvm.c
index f62d9ece3c..e7d9429af1 100644
--- a/target/arm/kvm.c
+++ b/target/arm/kvm.c
@@ -248,6 +248,22 @@ int kvm_arm_get_max_vm_ipa_size(MachineState *ms, bool *fixed_ipa)
     return ret > 0 ? ret : 40;
 }
 
+static void kvm_update_ipiv_cap(KVMState *s)
+{
+    int ret;
+
+    if (!kvm_check_extension(s, KVM_CAP_ARM_HISI_IPIV)) {
+        return;
+    }
+
+    ret = kvm_vm_enable_cap(s, KVM_CAP_ARM_HISI_IPIV, 0);
+    if (ret) {
+        fprintf(stderr, "Could not enable KVM_CAP_ARM_HISI_IPIV: %d\n", ret);
+    }
+
+    return;
+}
+
 int kvm_arch_init(MachineState *ms, KVMState *s)
 {
     int ret = 0;
@@ -281,6 +297,8 @@ int kvm_arch_init(MachineState *ms, KVMState *s)
         }
     }
 
+    kvm_update_ipiv_cap(s);
+
     return ret;
 }
 
-- 
Gitee