| From | Claudio Imbrenda <> | Subject | [PATCH v10 18/19] KVM: s390: pv: avoid export before import if possible | Date | Thu, 14 Apr 2022 10:03:09 +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> --- arch/s390/kernel/uv.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/s390/kernel/uv.c b/arch/s390/kernel/uv.c index e358b8bd864b..43393568f844 100644 --- a/arch/s390/kernel/uv.c +++ b/arch/s390/kernel/uv.c @@ -236,7 +236,8 @@ 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) { - return uvcb->cmd != UVC_CMD_UNPIN_PAGE_SHARED && + return !test_bit_inv(BIT_UV_FEAT_MISC, &uv_info.uv_feature_indications) && + uvcb->cmd != UVC_CMD_UNPIN_PAGE_SHARED && atomic_read(&mm->context.protected_count) > 1; } -- 2.34.1
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