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 v11 18/19] KVM: s390: pv: avoid export before import if possible
Date: Fri, 3 Jun 2022 08:56:44 +0200 [thread overview]
Message-ID: <20220603065645.10019-19-imbrenda@linux.ibm.com> (raw)
In-Reply-To: <20220603065645.10019-1-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 | 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
next prev parent reply other threads:[~2022-06-03 6:58 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-03 6:56 [PATCH v11 00/19] KVM: s390: pv: implement lazy destroy for reboot Claudio Imbrenda
2022-06-03 6:56 ` [PATCH v11 01/19] KVM: s390: pv: leak the topmost page table when destroy fails Claudio Imbrenda
2022-06-03 6:56 ` [PATCH v11 02/19] KVM: s390: pv: handle secure storage violations for protected guests Claudio Imbrenda
2022-06-03 6:56 ` [PATCH v11 03/19] KVM: s390: pv: handle secure storage exceptions for normal guests Claudio Imbrenda
2022-06-03 6:56 ` [PATCH v11 04/19] KVM: s390: pv: refactor s390_reset_acc Claudio Imbrenda
2022-06-03 6:56 ` [PATCH v11 05/19] KVM: s390: pv: usage counter instead of flag Claudio Imbrenda
2022-06-03 6:56 ` [PATCH v11 06/19] KVM: s390: pv: add export before import Claudio Imbrenda
2022-06-03 6:56 ` [PATCH v11 07/19] KVM: s390: pv: module parameter to fence asynchronous destroy Claudio Imbrenda
2022-06-15 9:53 ` Janosch Frank
2022-06-15 9:59 ` Claudio Imbrenda
2022-06-03 6:56 ` [PATCH v11 08/19] KVM: s390: pv: clear the state without memset Claudio Imbrenda
2022-06-03 6:56 ` [PATCH v11 09/19] KVM: s390: pv: Add kvm_s390_cpus_from_pv to kvm-s390.h and add documentation Claudio Imbrenda
2022-06-03 6:56 ` [PATCH v11 10/19] KVM: s390: pv: add mmu_notifier Claudio Imbrenda
2022-06-08 12:02 ` Nico Boehr
2022-06-03 6:56 ` [PATCH v11 11/19] s390/mm: KVM: pv: when tearing down, try to destroy protected pages Claudio Imbrenda
2022-06-08 12:03 ` Nico Boehr
2022-06-03 6:56 ` [PATCH v11 12/19] KVM: s390: pv: refactoring of kvm_s390_pv_deinit_vm Claudio Imbrenda
2022-06-03 6:56 ` [PATCH v11 13/19] KVM: s390: pv: destroy the configuration before its memory Claudio Imbrenda
2022-06-08 12:06 ` Nico Boehr
2022-06-14 14:23 ` Janosch Frank
2022-06-03 6:56 ` [PATCH v11 14/19] KVM: s390: pv: cleanup leftover protected VMs if needed Claudio Imbrenda
2022-06-15 9:59 ` Janosch Frank
2022-06-15 10:19 ` Claudio Imbrenda
2022-06-15 10:57 ` Janosch Frank
2022-06-15 11:13 ` Claudio Imbrenda
2022-06-03 6:56 ` [PATCH v11 15/19] KVM: s390: pv: asynchronous destroy for reboot Claudio Imbrenda
2022-06-15 10:58 ` Janosch Frank
2022-06-20 9:41 ` Janosch Frank
2022-06-03 6:56 ` [PATCH v11 16/19] KVM: s390: pv: api documentation for asynchronous destroy Claudio Imbrenda
2022-06-20 9:13 ` Janosch Frank
2022-06-03 6:56 ` [PATCH v11 17/19] KVM: s390: pv: add KVM_CAP_S390_PROTECTED_ASYNC_DISABLE Claudio Imbrenda
2022-06-03 6:56 ` Claudio Imbrenda [this message]
2022-06-07 14:33 ` [PATCH v11 18/19] KVM: s390: pv: avoid export before import if possible Nico Boehr
2022-06-20 9:56 ` Janosch Frank
2022-06-03 6:56 ` [PATCH v11 19/19] KVM: s390: pv: support for Destroy fast UVC Claudio Imbrenda
2022-06-14 14:29 ` [PATCH v11 00/19] KVM: s390: pv: implement lazy destroy for reboot Janosch Frank
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