From: Claudio Imbrenda <imbrenda@linux.ibm.com>
To: kvm@vger.kernel.org
Cc: cohuck@redhat.com, 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
Subject: [PATCH v6 10/17] KVM: s390: pv: add mmu_notifier
Date: Fri, 3 Dec 2021 17:58:07 +0100 [thread overview]
Message-ID: <20211203165814.73016-11-imbrenda@linux.ibm.com> (raw)
In-Reply-To: <20211203165814.73016-1-imbrenda@linux.ibm.com>
Add an mmu_notifier for protected VMs. The callback function is
triggered when the mm is torn down, and will attempt to convert all
protected vCPUs to non-protected. This allows the mm teardown to use
the destroy page UVC instead of export.
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
---
arch/s390/include/asm/kvm_host.h | 1 +
arch/s390/kvm/pv.c | 20 ++++++++++++++++++++
2 files changed, 21 insertions(+)
diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index a604d51acfc8..8b288cff2a3a 100644
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -921,6 +921,7 @@ struct kvm_s390_pv {
u64 guest_len;
unsigned long stor_base;
void *stor_var;
+ struct mmu_notifier mmu_notifier;
};
struct kvm_arch{
diff --git a/arch/s390/kvm/pv.c b/arch/s390/kvm/pv.c
index 59da54bd6b21..111f85158cce 100644
--- a/arch/s390/kvm/pv.c
+++ b/arch/s390/kvm/pv.c
@@ -195,6 +195,21 @@ int kvm_s390_pv_deinit_vm(struct kvm *kvm, u16 *rc, u16 *rrc)
return -EIO;
}
+static void kvm_s390_pv_mmu_notifier_release(struct mmu_notifier *subscription,
+ struct mm_struct *mm)
+{
+ struct kvm *kvm = container_of(subscription, struct kvm, arch.pv.mmu_notifier);
+ u16 dummy;
+
+ mutex_lock(&kvm->lock);
+ kvm_s390_cpus_from_pv(kvm, &dummy, &dummy);
+ mutex_unlock(&kvm->lock);
+}
+
+static const struct mmu_notifier_ops kvm_s390_pv_mmu_notifier_ops = {
+ .release = kvm_s390_pv_mmu_notifier_release,
+};
+
int kvm_s390_pv_init_vm(struct kvm *kvm, u16 *rc, u16 *rrc)
{
struct uv_cb_cgc uvcb = {
@@ -236,6 +251,11 @@ int kvm_s390_pv_init_vm(struct kvm *kvm, u16 *rc, u16 *rrc)
return -EIO;
}
kvm->arch.gmap->guest_handle = uvcb.guest_handle;
+ /* Add the notifier only once. No races because we hold kvm->lock */
+ if (kvm->arch.pv.mmu_notifier.ops != &kvm_s390_pv_mmu_notifier_ops) {
+ kvm->arch.pv.mmu_notifier.ops = &kvm_s390_pv_mmu_notifier_ops;
+ mmu_notifier_register(&kvm->arch.pv.mmu_notifier, kvm->mm);
+ }
return 0;
}
--
2.31.1
next prev parent reply other threads:[~2021-12-03 16:59 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-03 16:57 [PATCH v6 00/17] KVM: s390: pv: implement lazy destroy for reboot Claudio Imbrenda
2021-12-03 16:57 ` [PATCH v6 01/17] KVM: s390: pv: leak the topmost page table when destroy fails Claudio Imbrenda
2021-12-03 16:57 ` [PATCH v6 02/17] KVM: s390: pv: handle secure storage violations for protected guests Claudio Imbrenda
2022-01-13 9:54 ` Janosch Frank
2021-12-03 16:58 ` [PATCH v6 03/17] KVM: s390: pv: handle secure storage exceptions for normal guests Claudio Imbrenda
2022-01-13 9:58 ` Janosch Frank
2021-12-03 16:58 ` [PATCH v6 04/17] KVM: s390: pv: refactor s390_reset_acc Claudio Imbrenda
2021-12-03 16:58 ` [PATCH v6 05/17] KVM: s390: pv: usage counter instead of flag Claudio Imbrenda
2021-12-03 16:58 ` [PATCH v6 06/17] KVM: s390: pv: add export before import Claudio Imbrenda
2021-12-03 16:58 ` [PATCH v6 07/17] KVM: s390: pv: module parameter to fence lazy destroy Claudio Imbrenda
2021-12-03 16:58 ` [PATCH v6 08/17] KVM: s390: pv: make kvm_s390_cpus_from_pv global Claudio Imbrenda
2021-12-03 16:58 ` [PATCH v6 09/17] KVM: s390: pv: clear the state without memset Claudio Imbrenda
2022-01-13 10:30 ` Janosch Frank
2021-12-03 16:58 ` Claudio Imbrenda [this message]
2021-12-04 2:32 ` [PATCH v6 10/17] KVM: s390: pv: add mmu_notifier kernel test robot
2021-12-03 16:58 ` [PATCH v6 11/17] s390/mm: KVM: pv: when tearing down, try to destroy protected pages Claudio Imbrenda
2022-01-13 10:38 ` Janosch Frank
2021-12-03 16:58 ` [PATCH v6 12/17] KVM: s390: pv: refactoring of kvm_s390_pv_deinit_vm Claudio Imbrenda
2021-12-03 16:58 ` [PATCH v6 13/17] KVM: s390: pv: cleanup leftover protected VMs if needed Claudio Imbrenda
2021-12-03 16:58 ` [PATCH v6 14/17] KVM: s390: pv: asynchronous destroy for reboot Claudio Imbrenda
2021-12-03 16:58 ` [PATCH v6 15/17] KVM: s390: pv: api documentation for asynchronous destroy Claudio Imbrenda
2021-12-03 16:58 ` [PATCH v6 16/17] KVM: s390: pv: add KVM_CAP_S390_PROT_REBOOT_ASYNC Claudio Imbrenda
2021-12-03 16:58 ` [PATCH v6 17/17] KVM: s390: pv: avoid export before import if possible Claudio Imbrenda
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