diff mbox series

[v12,16/18] KVM: s390: pv: avoid export before import if possible

Message ID 20220628135619.32410-17-imbrenda@linux.ibm.com (mailing list archive)
State New, archived
Headers show
Series KVM: s390: pv: implement lazy destroy for reboot | expand

Commit Message

Claudio Imbrenda June 28, 2022, 1:56 p.m. UTC 
If the appropriate UV feature bit is set, there is no need to perform
an export before import.

Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Reviewed-by: Nico Boehr <nrb@linux.ibm.com>
---
 arch/s390/kernel/uv.c | 2 ++
 1 file changed, 2 insertions(+)
diff mbox series

Patch

diff --git a/arch/s390/kernel/uv.c b/arch/s390/kernel/uv.c
index 87b176008785..bfc85b0376e4 100644
--- a/arch/s390/kernel/uv.c
+++ b/arch/s390/kernel/uv.c
@@ -255,6 +255,8 @@  static int make_secure_pte(pte_t *ptep, unsigned long addr,
  */
 static bool should_export_before_import(struct uv_cb_header *uvcb, struct mm_struct *mm)
 {
+	if (test_bit_inv(BIT_UV_FEAT_MISC, &uv_info.uv_feature_indications))
+		return false;
 	if (uvcb->cmd == UVC_CMD_UNPIN_PAGE_SHARED)
 		return false;
 	return atomic_read(&mm->context.protected_count) > 1;