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Date: Fri, 3 Jun 2022 08:56:44 +0200 From: Claudio Imbrenda <imbrenda@...ux.ibm.com> To: kvm@...r.kernel.org Cc: borntraeger@...ibm.com, frankja@...ux.ibm.com, thuth@...hat.com, pasic@...ux.ibm.com, david@...hat.com, linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org, scgl@...ux.ibm.com, mimu@...ux.ibm.com, nrb@...ux.ibm.com Subject: [PATCH v11 18/19] KVM: s390: pv: avoid export before import if possible If the appropriate UV feature bit is set, there is no need to perform an export before import. Signed-off-by: Claudio Imbrenda <imbrenda@...ux.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 02aca3c5dce1..c18c3d6a4314 100644 --- a/arch/s390/kernel/uv.c +++ b/arch/s390/kernel/uv.c @@ -249,6 +249,8 @@ 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; -- 2.36.1
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