qemu/target-i386-sev-Clear-shared_regions_list-when-reboo.patch

From e98147762cb47645c590ee000dbc12c654a6cc2d Mon Sep 17 00:00:00 2001
From: hanliyang <hanliyang@hygon.cn>
Date: Sun, 16 Jan 2022 19:57:58 -0500
Subject: [PATCH] target/i386: sev: Clear shared_regions_list when reboot CSV
 Guest

Also fix memory leak in sev_remove_shared_regions_list().

Signed-off-by: hanliyang <hanliyang@hygon.cn>
---
 target/i386/kvm/kvm.c | 5 +++++
 target/i386/sev.c     | 5 +++--
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c
index a5a755db01..5730d0e0c0 100644
--- a/target/i386/kvm/kvm.c
+++ b/target/i386/kvm/kvm.c
@@ -2270,6 +2270,11 @@ void kvm_arch_reset_vcpu(X86CPU *cpu)
         env->mp_state = KVM_MP_STATE_RUNNABLE;
     }
 
+    if (cpu_is_bsp(cpu) &&
+        sev_enabled() && has_map_gpa_range) {
+        sev_remove_shared_regions_list(0, -1);
+    }
+
     /* enabled by default */
     env->poll_control_msr = 1;
 
diff --git a/target/i386/sev.c b/target/i386/sev.c
index 6ccb22c00a..0b0f589aee 100644
--- a/target/i386/sev.c
+++ b/target/i386/sev.c
@@ -1694,9 +1694,9 @@ int sev_load_incoming_page(QEMUFile *f, uint8_t *ptr)
 int sev_remove_shared_regions_list(unsigned long start, unsigned long end)
 {
     SevGuestState *s = sev_guest;
-    struct shared_region *pos;
+    struct shared_region *pos, *next_pos;
 
-    QTAILQ_FOREACH(pos, &s->shared_regions_list, list) {
+    QTAILQ_FOREACH_SAFE(pos, &s->shared_regions_list, list, next_pos) {
         unsigned long l, r;
         unsigned long curr_gfn_end = pos->gfn_end;
 
@@ -1710,6 +1710,7 @@ int sev_remove_shared_regions_list(unsigned long start, unsigned long end)
         if (l <= r) {
             if (pos->gfn_start == l && pos->gfn_end == r) {
                 QTAILQ_REMOVE(&s->shared_regions_list, pos, list);
+                g_free(pos);
             } else if (l == pos->gfn_start) {
                 pos->gfn_start = r;
             } else if (r == pos->gfn_end) {
-- 
2.41.0.windows.1