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 09/17] KVM: s390: pv: Add kvm_s390_cpus_from_pv to kvm-s390.h and add documentation
Date: Wed, 2 Mar 2022 19:11:35 +0100 [thread overview]
Message-ID: <20220302181143.188283-10-imbrenda@linux.ibm.com> (raw)
In-Reply-To: <20220302181143.188283-1-imbrenda@linux.ibm.com>
Future changes make it necessary to call this function from pv.c.
While we are at it, let's properly document kvm_s390_cpus_from_pv() and
kvm_s390_cpus_to_pv().
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
---
arch/s390/kvm/kvm-s390.c | 26 +++++++++++++++++++++++++-
arch/s390/kvm/kvm-s390.h | 1 +
2 files changed, 26 insertions(+), 1 deletion(-)
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 702696189505..21fcca09e9bf 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -2175,7 +2175,20 @@ static int kvm_s390_set_cmma_bits(struct kvm *kvm,
return r;
}
-static int kvm_s390_cpus_from_pv(struct kvm *kvm, u16 *rcp, u16 *rrcp)
+/**
+ * kvm_s390_cpus_from_pv - Convert all protected vCPUs in a protected VM to
+ * non protected.
+ * @kvm the VM whose protected vCPUs are to be converted
+ * @rcp return value for the RC field of the UVC (in case of error)
+ * @rrcp return value for the RRC field of the UVC (in case of error)
+ *
+ * Does not stop in case of error, tries to convert as many
+ * CPUs as possible. In case of error, the RC and RRC of the last error are
+ * returned.
+ *
+ * Return: 0 in case of success, otherwise -EIO
+ */
+int kvm_s390_cpus_from_pv(struct kvm *kvm, u16 *rcp, u16 *rrcp)
{
struct kvm_vcpu *vcpu;
u16 rc, rrc;
@@ -2202,6 +2215,17 @@ static int kvm_s390_cpus_from_pv(struct kvm *kvm, u16 *rcp, u16 *rrcp)
return ret;
}
+/**
+ * kvm_s390_cpus_to_pv - Convert all non-protected vCPUs in a protected VM
+ * to protected.
+ * @kvm the VM whose protected vCPUs are to be converted
+ * @rcp return value for the RC field of the UVC (in case of error)
+ * @rrcp return value for the RRC field of the UVC (in case of error)
+ *
+ * Tries to undo the conversion in case of error.
+ *
+ * Return: 0 in case of success, otherwise -EIO
+ */
static int kvm_s390_cpus_to_pv(struct kvm *kvm, u16 *rc, u16 *rrc)
{
unsigned long i;
diff --git a/arch/s390/kvm/kvm-s390.h b/arch/s390/kvm/kvm-s390.h
index 098831e815e6..9276d910631b 100644
--- a/arch/s390/kvm/kvm-s390.h
+++ b/arch/s390/kvm/kvm-s390.h
@@ -365,6 +365,7 @@ int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu);
void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu);
void kvm_s390_set_cpu_timer(struct kvm_vcpu *vcpu, __u64 cputm);
__u64 kvm_s390_get_cpu_timer(struct kvm_vcpu *vcpu);
+int kvm_s390_cpus_from_pv(struct kvm *kvm, u16 *rcp, u16 *rrcp);
/* implemented in diag.c */
int kvm_s390_handle_diag(struct kvm_vcpu *vcpu);
--
2.34.1
next prev parent reply other threads:[~2022-03-02 18:13 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 ` Claudio Imbrenda [this message]
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 ` [PATCH v8 17/17] KVM: s390: pv: avoid export before import if possible Claudio Imbrenda
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