On 12/3/21 17:58, Claudio Imbrenda wrote:
Do not use memset to clean the whole struct kvm_s390_pv; instead,
explicitly clear the fields that need to be cleared.
Upcoming patches will introduce new fields in the struct kvm_s390_pv
that will not need to be cleared.
Signed-off-by: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx>
---
arch/s390/kvm/pv.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/arch/s390/kvm/pv.c b/arch/s390/kvm/pv.c
index 04aa4a20260b..59da54bd6b21 100644
--- a/arch/s390/kvm/pv.c
+++ b/arch/s390/kvm/pv.c
@@ -16,6 +16,15 @@
#include <linux/sched/mm.h>
#include "kvm-s390.h"
+static void kvm_s390_clear_pv_state(struct kvm *kvm)
+{
+ kvm->arch.pv.handle = 0;
+ kvm->arch.pv.guest_len = 0;
+ kvm->arch.pv.stor_base = 0;
+ kvm->arch.pv.stor_var = NULL;
+ kvm->arch.pv.handle = 0;
We could use the same approach that we use in qemu to do the cpu resets.
But maybe that would be overkill for a few struct members.
+}
+
int kvm_s390_pv_destroy_cpu(struct kvm_vcpu *vcpu, u16 *rc, u16 *rrc)
{
int cc;
@@ -110,7 +119,7 @@ static void kvm_s390_pv_dealloc_vm(struct kvm *kvm)
vfree(kvm->arch.pv.stor_var);
free_pages(kvm->arch.pv.stor_base,
get_order(uv_info.guest_base_stor_len));
- memset(&kvm->arch.pv, 0, sizeof(kvm->arch.pv));
+ kvm_s390_clear_pv_state(kvm);
}
static int kvm_s390_pv_alloc_vm(struct kvm *kvm)
