From: Claudio Imbrenda <imbrenda@linux.ibm.com>
To: kvm@vger.kernel.org
Cc: borntraeger@de.ibm.com, frankja@linux.ibm.com, thuth@redhat.com,
pasic@linux.ibm.com, david@redhat.com,
linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org,
scgl@linux.ibm.com, mimu@linux.ibm.com, nrb@linux.ibm.com
Subject: [PATCH v8 17/17] KVM: s390: pv: avoid export before import if possible
Date: Wed, 2 Mar 2022 19:11:43 +0100 [thread overview]
Message-ID: <20220302181143.188283-18-imbrenda@linux.ibm.com> (raw)
In-Reply-To: <20220302181143.188283-1-imbrenda@linux.ibm.com>
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
prev parent reply other threads:[~2022-03-02 18:12 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-02 18:11 [PATCH v8 00/17] KVM: s390: pv: implement lazy destroy for reboot Claudio Imbrenda
2022-03-02 18:11 ` [PATCH v8 01/17] KVM: s390: pv: leak the topmost page table when destroy fails Claudio Imbrenda
2022-03-03 14:40 ` Janis Schoetterl-Glausch
2022-03-03 15:05 ` Claudio Imbrenda
2022-03-03 16:34 ` Janis Schoetterl-Glausch
2022-03-02 18:11 ` [PATCH v8 02/17] KVM: s390: pv: handle secure storage violations for protected guests Claudio Imbrenda
2022-03-02 18:11 ` [PATCH v8 03/17] KVM: s390: pv: handle secure storage exceptions for normal guests Claudio Imbrenda
2022-03-02 18:11 ` [PATCH v8 04/17] KVM: s390: pv: refactor s390_reset_acc Claudio Imbrenda
2022-03-02 18:11 ` [PATCH v8 05/17] KVM: s390: pv: usage counter instead of flag Claudio Imbrenda
2022-03-02 18:11 ` [PATCH v8 06/17] KVM: s390: pv: add export before import Claudio Imbrenda
2022-03-02 18:11 ` [PATCH v8 07/17] KVM: s390: pv: module parameter to fence lazy destroy Claudio Imbrenda
2022-03-02 18:11 ` [PATCH v8 08/17] KVM: s390: pv: clear the state without memset Claudio Imbrenda
2022-03-02 18:11 ` [PATCH v8 09/17] KVM: s390: pv: Add kvm_s390_cpus_from_pv to kvm-s390.h and add documentation Claudio Imbrenda
2022-03-02 18:11 ` [PATCH v8 10/17] KVM: s390: pv: add mmu_notifier Claudio Imbrenda
2022-03-03 3:12 ` kernel test robot
2022-03-03 3:12 ` kernel test robot
2022-03-02 18:11 ` [PATCH v8 11/17] s390/mm: KVM: pv: when tearing down, try to destroy protected pages Claudio Imbrenda
2022-03-02 18:11 ` [PATCH v8 12/17] KVM: s390: pv: refactoring of kvm_s390_pv_deinit_vm Claudio Imbrenda
2022-03-02 18:11 ` [PATCH v8 13/17] KVM: s390: pv: cleanup leftover protected VMs if needed Claudio Imbrenda
2022-03-02 18:11 ` [PATCH v8 14/17] KVM: s390: pv: asynchronous destroy for reboot Claudio Imbrenda
2022-03-02 18:11 ` [PATCH v8 15/17] KVM: s390: pv: api documentation for asynchronous destroy Claudio Imbrenda
2022-03-02 18:11 ` [PATCH v8 16/17] KVM: s390: pv: add KVM_CAP_S390_PROTECTED_ASYNC_DISABLE Claudio Imbrenda
2022-03-02 18:11 ` Claudio Imbrenda [this message]
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