[PATCH v2 5/5] i386/cpu: Free env->xsave_buf in x86_cpu_unrealizefn()

[Mark Kanda <mark.kanda@oracle.com>]

vCPU hotunplug related leak reported by Valgrind:

==132362== 4,096 bytes in 1 blocks are definitely lost in loss record 8,440 of 8,549
==132362==    at 0x4C3B15F: memalign (vg_replace_malloc.c:1265)
==132362==    by 0x4C3B288: posix_memalign (vg_replace_malloc.c:1429)
==132362==    by 0xB41195: qemu_try_memalign (memalign.c:53)
==132362==    by 0xB41204: qemu_memalign (memalign.c:73)
==132362==    by 0x7131CB: kvm_init_xsave (kvm.c:1601)
==132362==    by 0x7148ED: kvm_arch_init_vcpu (kvm.c:2031)
==132362==    by 0x91D224: kvm_init_vcpu (kvm-all.c:516)
==132362==    by 0x9242C9: kvm_vcpu_thread_fn (kvm-accel-ops.c:40)
==132362==    by 0xB2EB26: qemu_thread_start (qemu-thread-posix.c:556)
==132362==    by 0x7EB2159: start_thread (in /usr/lib64/libpthread-2.28.so)
==132362==    by 0x9D45DD2: clone (in /usr/lib64/libc-2.28.so)

Signed-off-by: Mark Kanda <mark.kanda@oracle.com>
---
 target/i386/cpu.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index a88d6554c8..014a716c36 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -6572,6 +6572,11 @@ static void x86_cpu_unrealizefn(DeviceState *dev)
     }
 
     xcc->parent_unrealize(dev);
+
+#if defined(CONFIG_KVM) || defined(CONFIG_HVF)
+    CPUX86State *env = &cpu->env;
+    g_free(env->xsave_buf);
+#endif
 }
 
 typedef struct BitProperty {
-- 
2.27.0