Messages in this thread Patch in this message | | | From | Claudio Imbrenda <> | Subject | [PATCH v13 4/6] KVM: s390: pv: avoid export before import if possible | Date | Wed, 10 Aug 2022 14:56:23 +0200 |
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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 --git a/arch/s390/kernel/uv.c b/arch/s390/kernel/uv.c index f9810d2a267c..b455646c8d74 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; -- 2.37.1
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