From: David Gibson <david@gibson.dropbear.id.au> To: "Cédric Le Goater" <clg@kaod.org> Cc: kvm@vger.kernel.org, kvm-ppc@vger.kernel.org, Paul Mackerras <paulus@samba.org>, linuxppc-dev@lists.ozlabs.org Subject: Re: [PATCH v2 16/16] KVM: PPC: Book3S HV: XIVE: clear the vCPU interrupt presenters Date: Mon, 25 Feb 2019 15:18:58 +1100 [thread overview] Message-ID: <20190225041858.GT7668@umbus.fritz.box> (raw) In-Reply-To: <20190222112840.25000-17-clg@kaod.org> [-- Attachment #1: Type: text/plain, Size: 5712 bytes --] On Fri, Feb 22, 2019 at 12:28:40PM +0100, Cédric Le Goater wrote: > When the VM boots, the CAS negotiation process determines which > interrupt mode to use and invokes a machine reset. At that time, the > previous KVM interrupt device is 'destroyed' before the chosen one is > created. Upon destruction, the vCPU interrupt presenters using the KVM > device should be cleared first, the machine will reconnect them later > to the new device after it is created. > > When using the KVM device, there is still a race window with the early > checks in kvmppc_native_connect_vcpu(). Yet to be fixed. > > Signed-off-by: Cédric Le Goater <clg@kaod.org> > --- > arch/powerpc/kvm/book3s_xics.c | 19 +++++++++++++ > arch/powerpc/kvm/book3s_xive.c | 39 +++++++++++++++++++++++++-- > arch/powerpc/kvm/book3s_xive_native.c | 16 +++++++++++ > 3 files changed, 72 insertions(+), 2 deletions(-) > > diff --git a/arch/powerpc/kvm/book3s_xics.c b/arch/powerpc/kvm/book3s_xics.c > index f27ee57ab46e..81cdabf4295f 100644 > --- a/arch/powerpc/kvm/book3s_xics.c > +++ b/arch/powerpc/kvm/book3s_xics.c > @@ -1342,6 +1342,25 @@ static void kvmppc_xics_free(struct kvm_device *dev) > struct kvmppc_xics *xics = dev->private; > int i; > struct kvm *kvm = xics->kvm; > + struct kvm_vcpu *vcpu; > + > + /* > + * When destroying the VM, the vCPUs are destroyed first and > + * the vCPU list should be empty. If this is not the case, > + * then we are simply destroying the device and we should > + * clean up the vCPU interrupt presenters first. > + */ > + if (atomic_read(&kvm->online_vcpus) != 0) { > + /* > + * call kick_all_cpus_sync() to ensure that all CPUs > + * have executed any pending interrupts > + */ > + if (is_kvmppc_hv_enabled(kvm)) > + kick_all_cpus_sync(); > + > + kvm_for_each_vcpu(i, vcpu, kvm) > + kvmppc_xics_free_icp(vcpu); > + } > > debugfs_remove(xics->dentry); > > diff --git a/arch/powerpc/kvm/book3s_xive.c b/arch/powerpc/kvm/book3s_xive.c > index 7a14512b8944..0a1c11d6881c 100644 > --- a/arch/powerpc/kvm/book3s_xive.c > +++ b/arch/powerpc/kvm/book3s_xive.c > @@ -1105,11 +1105,19 @@ void kvmppc_xive_disable_vcpu_interrupts(struct kvm_vcpu *vcpu) > void kvmppc_xive_cleanup_vcpu(struct kvm_vcpu *vcpu) > { > struct kvmppc_xive_vcpu *xc = vcpu->arch.xive_vcpu; > - struct kvmppc_xive *xive = xc->xive; > + struct kvmppc_xive *xive; > int i; > > + if (!kvmppc_xics_enabled(vcpu)) This should be kvmppc_xive_enabled(), no? > + return; > + > + if (!xc) > + return; > + > pr_devel("cleanup_vcpu(cpu=%d)\n", xc->server_num); > > + xive = xc->xive; > + > /* Ensure no interrupt is still routed to that VP */ > xc->valid = false; > kvmppc_xive_disable_vcpu_interrupts(vcpu); > @@ -1146,6 +1154,10 @@ void kvmppc_xive_cleanup_vcpu(struct kvm_vcpu *vcpu) > } > /* Free the VP */ > kfree(xc); > + > + /* Cleanup the vcpu */ > + vcpu->arch.irq_type = KVMPPC_IRQ_DEFAULT; > + vcpu->arch.xive_vcpu = NULL; > } > > int kvmppc_xive_connect_vcpu(struct kvm_device *dev, > @@ -1163,7 +1175,7 @@ int kvmppc_xive_connect_vcpu(struct kvm_device *dev, > } > if (xive->kvm != vcpu->kvm) > return -EPERM; > - if (vcpu->arch.irq_type) > + if (vcpu->arch.irq_type != KVMPPC_IRQ_DEFAULT) > return -EBUSY; > if (kvmppc_xive_find_server(vcpu->kvm, cpu)) { > pr_devel("Duplicate !\n"); > @@ -1833,8 +1845,31 @@ static void kvmppc_xive_free(struct kvm_device *dev) > { > struct kvmppc_xive *xive = dev->private; > struct kvm *kvm = xive->kvm; > + struct kvm_vcpu *vcpu; > int i; > > + /* > + * When destroying the VM, the vCPUs are destroyed first and > + * the vCPU list should be empty. If this is not the case, > + * then we are simply destroying the device and we should > + * clean up the vCPU interrupt presenters first. > + */ > + if (atomic_read(&kvm->online_vcpus) != 0) { > + /* > + * call kick_all_cpus_sync() to ensure that all CPUs > + * have executed any pending interrupts > + */ > + if (is_kvmppc_hv_enabled(kvm)) > + kick_all_cpus_sync(); > + > + /* > + * TODO: There is still a race window with the early > + * checks in kvmppc_native_connect_vcpu() > + */ > + kvm_for_each_vcpu(i, vcpu, kvm) > + kvmppc_xive_cleanup_vcpu(vcpu); > + } > + > debugfs_remove(xive->dentry); > > if (kvm) > diff --git a/arch/powerpc/kvm/book3s_xive_native.c b/arch/powerpc/kvm/book3s_xive_native.c > index bf60870144f1..c0655164d9af 100644 > --- a/arch/powerpc/kvm/book3s_xive_native.c > +++ b/arch/powerpc/kvm/book3s_xive_native.c > @@ -909,8 +909,24 @@ static void kvmppc_xive_native_free(struct kvm_device *dev) > { > struct kvmppc_xive *xive = dev->private; > struct kvm *kvm = xive->kvm; > + struct kvm_vcpu *vcpu; > int i; > > + /* > + * When destroying the VM, the vCPUs are destroyed first and > + * the vCPU list should be empty. If this is not the case, > + * then we are simply destroying the device and we should > + * clean up the vCPU interrupt presenters first. > + */ > + if (atomic_read(&kvm->online_vcpus) != 0) { > + /* > + * TODO: There is still a race window with the early > + * checks in kvmppc_xive_native_connect_vcpu() > + */ > + kvm_for_each_vcpu(i, vcpu, kvm) > + kvmppc_xive_native_cleanup_vcpu(vcpu); > + } > + > debugfs_remove(xive->dentry); > > pr_devel("Destroying xive native device\n"); -- David Gibson | I'll have my music baroque, and my code david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_ | _way_ _around_! http://www.ozlabs.org/~dgibson [-- Attachment #2: signature.asc --] [-- Type: application/pgp-signature, Size: 833 bytes --]
WARNING: multiple messages have this Message-ID (diff)
From: David Gibson <david@gibson.dropbear.id.au> To: "Cédric Le Goater" <clg@kaod.org> Cc: kvm@vger.kernel.org, kvm-ppc@vger.kernel.org, Paul Mackerras <paulus@samba.org>, linuxppc-dev@lists.ozlabs.org Subject: Re: [PATCH v2 16/16] KVM: PPC: Book3S HV: XIVE: clear the vCPU interrupt presenters Date: Mon, 25 Feb 2019 04:18:58 +0000 [thread overview] Message-ID: <20190225041858.GT7668@umbus.fritz.box> (raw) In-Reply-To: <20190222112840.25000-17-clg@kaod.org> [-- Attachment #1: Type: text/plain, Size: 5712 bytes --] On Fri, Feb 22, 2019 at 12:28:40PM +0100, Cédric Le Goater wrote: > When the VM boots, the CAS negotiation process determines which > interrupt mode to use and invokes a machine reset. At that time, the > previous KVM interrupt device is 'destroyed' before the chosen one is > created. Upon destruction, the vCPU interrupt presenters using the KVM > device should be cleared first, the machine will reconnect them later > to the new device after it is created. > > When using the KVM device, there is still a race window with the early > checks in kvmppc_native_connect_vcpu(). Yet to be fixed. > > Signed-off-by: Cédric Le Goater <clg@kaod.org> > --- > arch/powerpc/kvm/book3s_xics.c | 19 +++++++++++++ > arch/powerpc/kvm/book3s_xive.c | 39 +++++++++++++++++++++++++-- > arch/powerpc/kvm/book3s_xive_native.c | 16 +++++++++++ > 3 files changed, 72 insertions(+), 2 deletions(-) > > diff --git a/arch/powerpc/kvm/book3s_xics.c b/arch/powerpc/kvm/book3s_xics.c > index f27ee57ab46e..81cdabf4295f 100644 > --- a/arch/powerpc/kvm/book3s_xics.c > +++ b/arch/powerpc/kvm/book3s_xics.c > @@ -1342,6 +1342,25 @@ static void kvmppc_xics_free(struct kvm_device *dev) > struct kvmppc_xics *xics = dev->private; > int i; > struct kvm *kvm = xics->kvm; > + struct kvm_vcpu *vcpu; > + > + /* > + * When destroying the VM, the vCPUs are destroyed first and > + * the vCPU list should be empty. If this is not the case, > + * then we are simply destroying the device and we should > + * clean up the vCPU interrupt presenters first. > + */ > + if (atomic_read(&kvm->online_vcpus) != 0) { > + /* > + * call kick_all_cpus_sync() to ensure that all CPUs > + * have executed any pending interrupts > + */ > + if (is_kvmppc_hv_enabled(kvm)) > + kick_all_cpus_sync(); > + > + kvm_for_each_vcpu(i, vcpu, kvm) > + kvmppc_xics_free_icp(vcpu); > + } > > debugfs_remove(xics->dentry); > > diff --git a/arch/powerpc/kvm/book3s_xive.c b/arch/powerpc/kvm/book3s_xive.c > index 7a14512b8944..0a1c11d6881c 100644 > --- a/arch/powerpc/kvm/book3s_xive.c > +++ b/arch/powerpc/kvm/book3s_xive.c > @@ -1105,11 +1105,19 @@ void kvmppc_xive_disable_vcpu_interrupts(struct kvm_vcpu *vcpu) > void kvmppc_xive_cleanup_vcpu(struct kvm_vcpu *vcpu) > { > struct kvmppc_xive_vcpu *xc = vcpu->arch.xive_vcpu; > - struct kvmppc_xive *xive = xc->xive; > + struct kvmppc_xive *xive; > int i; > > + if (!kvmppc_xics_enabled(vcpu)) This should be kvmppc_xive_enabled(), no? > + return; > + > + if (!xc) > + return; > + > pr_devel("cleanup_vcpu(cpu=%d)\n", xc->server_num); > > + xive = xc->xive; > + > /* Ensure no interrupt is still routed to that VP */ > xc->valid = false; > kvmppc_xive_disable_vcpu_interrupts(vcpu); > @@ -1146,6 +1154,10 @@ void kvmppc_xive_cleanup_vcpu(struct kvm_vcpu *vcpu) > } > /* Free the VP */ > kfree(xc); > + > + /* Cleanup the vcpu */ > + vcpu->arch.irq_type = KVMPPC_IRQ_DEFAULT; > + vcpu->arch.xive_vcpu = NULL; > } > > int kvmppc_xive_connect_vcpu(struct kvm_device *dev, > @@ -1163,7 +1175,7 @@ int kvmppc_xive_connect_vcpu(struct kvm_device *dev, > } > if (xive->kvm != vcpu->kvm) > return -EPERM; > - if (vcpu->arch.irq_type) > + if (vcpu->arch.irq_type != KVMPPC_IRQ_DEFAULT) > return -EBUSY; > if (kvmppc_xive_find_server(vcpu->kvm, cpu)) { > pr_devel("Duplicate !\n"); > @@ -1833,8 +1845,31 @@ static void kvmppc_xive_free(struct kvm_device *dev) > { > struct kvmppc_xive *xive = dev->private; > struct kvm *kvm = xive->kvm; > + struct kvm_vcpu *vcpu; > int i; > > + /* > + * When destroying the VM, the vCPUs are destroyed first and > + * the vCPU list should be empty. If this is not the case, > + * then we are simply destroying the device and we should > + * clean up the vCPU interrupt presenters first. > + */ > + if (atomic_read(&kvm->online_vcpus) != 0) { > + /* > + * call kick_all_cpus_sync() to ensure that all CPUs > + * have executed any pending interrupts > + */ > + if (is_kvmppc_hv_enabled(kvm)) > + kick_all_cpus_sync(); > + > + /* > + * TODO: There is still a race window with the early > + * checks in kvmppc_native_connect_vcpu() > + */ > + kvm_for_each_vcpu(i, vcpu, kvm) > + kvmppc_xive_cleanup_vcpu(vcpu); > + } > + > debugfs_remove(xive->dentry); > > if (kvm) > diff --git a/arch/powerpc/kvm/book3s_xive_native.c b/arch/powerpc/kvm/book3s_xive_native.c > index bf60870144f1..c0655164d9af 100644 > --- a/arch/powerpc/kvm/book3s_xive_native.c > +++ b/arch/powerpc/kvm/book3s_xive_native.c > @@ -909,8 +909,24 @@ static void kvmppc_xive_native_free(struct kvm_device *dev) > { > struct kvmppc_xive *xive = dev->private; > struct kvm *kvm = xive->kvm; > + struct kvm_vcpu *vcpu; > int i; > > + /* > + * When destroying the VM, the vCPUs are destroyed first and > + * the vCPU list should be empty. If this is not the case, > + * then we are simply destroying the device and we should > + * clean up the vCPU interrupt presenters first. > + */ > + if (atomic_read(&kvm->online_vcpus) != 0) { > + /* > + * TODO: There is still a race window with the early > + * checks in kvmppc_xive_native_connect_vcpu() > + */ > + kvm_for_each_vcpu(i, vcpu, kvm) > + kvmppc_xive_native_cleanup_vcpu(vcpu); > + } > + > debugfs_remove(xive->dentry); > > pr_devel("Destroying xive native device\n"); -- David Gibson | I'll have my music baroque, and my code david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_ | _way_ _around_! http://www.ozlabs.org/~dgibson [-- Attachment #2: signature.asc --] [-- Type: application/pgp-signature, Size: 833 bytes --]
next prev parent reply other threads:[~2019-02-25 4:18 UTC|newest] Thread overview: 142+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-02-22 11:28 [PATCH v2 00/16] KVM: PPC: Book3S HV: add XIVE native exploitation mode Cédric Le Goater 2019-02-22 11:28 ` Cédric Le Goater 2019-02-22 11:28 ` [PATCH v2 01/16] powerpc/xive: add OPAL extensions for the XIVE native exploitation support Cédric Le Goater 2019-02-22 11:28 ` Cédric Le Goater 2019-02-24 23:42 ` David Gibson 2019-02-24 23:42 ` David Gibson 2019-02-25 3:50 ` Michael Ellerman 2019-02-25 3:50 ` Michael Ellerman 2019-02-25 10:11 ` Cédric Le Goater 2019-02-25 10:11 ` Cédric Le Goater 2019-02-26 4:21 ` David Gibson 2019-02-26 4:21 ` David Gibson 2019-03-12 18:25 ` Cédric Le Goater 2019-03-12 18:25 ` Cédric Le Goater 2019-02-22 11:28 ` [PATCH v2 02/16] KVM: PPC: Book3S HV: add a new KVM device for the XIVE native exploitation mode Cédric Le Goater 2019-02-22 11:28 ` Cédric Le Goater 2019-02-25 0:08 ` David Gibson 2019-02-25 0:08 ` David Gibson 2019-03-12 11:14 ` Cédric Le Goater 2019-03-12 11:14 ` Cédric Le Goater 2019-02-22 11:28 ` [PATCH v2 03/16] KVM: PPC: Book3S HV: XIVE: introduce a new capability KVM_CAP_PPC_IRQ_XIVE Cédric Le Goater 2019-02-22 11:28 ` Cédric Le Goater 2019-02-25 0:35 ` David Gibson 2019-02-25 0:35 ` David Gibson 2019-02-25 4:59 ` Paul Mackerras 2019-02-25 4:59 ` Paul Mackerras 2019-03-12 14:10 ` Cédric Le Goater 2019-03-12 14:10 ` Cédric Le Goater 2019-03-12 14:03 ` Cédric Le Goater 2019-03-12 14:03 ` Cédric Le Goater 2019-03-13 4:05 ` David Gibson 2019-03-13 4:05 ` David Gibson 2019-02-25 4:35 ` Paul Mackerras 2019-02-25 4:35 ` Paul Mackerras 2019-03-13 8:34 ` Cédric Le Goater 2019-03-13 8:34 ` Cédric Le Goater 2019-03-14 2:29 ` David Gibson 2019-03-14 2:29 ` David Gibson 2019-02-22 11:28 ` [PATCH v2 04/16] KVM: PPC: Book3S HV: XIVE: add a control to initialize a source Cédric Le Goater 2019-02-22 11:28 ` Cédric Le Goater 2019-02-25 2:10 ` David Gibson 2019-02-25 2:10 ` David Gibson 2019-02-26 4:25 ` Paul Mackerras 2019-02-26 4:25 ` Paul Mackerras 2019-02-26 23:20 ` David Gibson 2019-02-26 23:20 ` David Gibson 2019-03-12 15:19 ` Cédric Le Goater 2019-03-12 15:19 ` Cédric Le Goater 2019-03-14 2:15 ` David Gibson 2019-03-14 2:15 ` David Gibson 2019-02-25 5:30 ` Paul Mackerras 2019-02-25 5:30 ` Paul Mackerras 2019-02-22 11:28 ` [PATCH v2 05/16] KVM: PPC: Book3S HV: XIVE: add a control to configure " Cédric Le Goater 2019-02-22 11:28 ` Cédric Le Goater 2019-02-25 2:21 ` David Gibson 2019-02-25 2:21 ` David Gibson 2019-02-22 11:28 ` [PATCH v2 06/16] KVM: PPC: Book3S HV: XIVE: add controls for the EQ configuration Cédric Le Goater 2019-02-22 11:28 ` Cédric Le Goater 2019-02-25 2:39 ` David Gibson 2019-02-25 2:39 ` David Gibson 2019-03-12 17:00 ` Cédric Le Goater 2019-03-12 17:00 ` Cédric Le Goater 2019-03-13 4:03 ` David Gibson 2019-03-13 4:03 ` David Gibson 2019-03-13 8:46 ` Cédric Le Goater 2019-03-13 8:46 ` Cédric Le Goater 2019-03-14 3:29 ` David Gibson 2019-03-14 3:29 ` David Gibson 2019-02-26 5:24 ` Paul Mackerras 2019-02-26 5:24 ` Paul Mackerras 2019-03-13 9:40 ` Cédric Le Goater 2019-03-13 9:40 ` Cédric Le Goater 2019-03-14 2:32 ` David Gibson 2019-03-14 2:32 ` David Gibson 2019-03-14 7:11 ` Cédric Le Goater 2019-03-14 7:11 ` Cédric Le Goater 2019-03-15 0:29 ` David Gibson 2019-03-15 0:29 ` David Gibson 2019-02-22 11:28 ` [PATCH v2 07/16] KVM: PPC: Book3S HV: XIVE: add a global reset control Cédric Le Goater 2019-02-22 11:28 ` Cédric Le Goater 2019-02-25 2:43 ` David Gibson 2019-02-25 2:43 ` David Gibson 2019-02-22 11:28 ` [PATCH v2 08/16] KVM: PPC: Book3S HV: XIVE: add a control to sync the sources Cédric Le Goater 2019-02-22 11:28 ` Cédric Le Goater 2019-02-25 2:45 ` David Gibson 2019-02-25 2:45 ` David Gibson 2019-02-22 11:28 ` [PATCH v2 09/16] KVM: PPC: Book3S HV: XIVE: add a control to dirty the XIVE EQ pages Cédric Le Goater 2019-02-22 11:28 ` Cédric Le Goater 2019-02-25 2:53 ` David Gibson 2019-02-25 2:53 ` David Gibson 2019-03-13 11:48 ` Cédric Le Goater 2019-03-13 11:48 ` Cédric Le Goater 2019-03-14 2:33 ` David Gibson 2019-03-14 2:33 ` David Gibson 2019-02-22 11:28 ` [PATCH v2 10/16] KVM: PPC: Book3S HV: XIVE: add get/set accessors for the VP XIVE state Cédric Le Goater 2019-02-22 11:28 ` Cédric Le Goater 2019-02-25 3:31 ` David Gibson 2019-02-25 3:31 ` David Gibson 2019-03-13 13:19 ` Cédric Le Goater 2019-03-13 13:19 ` Cédric Le Goater 2019-03-14 3:09 ` David Gibson 2019-03-14 3:09 ` David Gibson 2019-03-14 7:08 ` Cédric Le Goater 2019-03-14 7:08 ` Cédric Le Goater 2019-02-22 11:28 ` [PATCH v2 11/16] KVM: introduce a 'mmap' method for KVM devices Cédric Le Goater 2019-02-22 11:28 ` Cédric Le Goater 2019-02-25 3:33 ` David Gibson 2019-02-25 3:33 ` David Gibson 2019-02-25 10:57 ` Cédric Le Goater 2019-02-25 10:57 ` Cédric Le Goater 2019-02-26 12:52 ` Paolo Bonzini 2019-02-26 12:52 ` Paolo Bonzini 2019-02-26 23:22 ` David Gibson 2019-02-26 23:22 ` David Gibson 2019-02-22 11:28 ` [PATCH v2 12/16] KVM: PPC: Book3S HV: XIVE: add a TIMA mapping Cédric Le Goater 2019-02-22 11:28 ` Cédric Le Goater 2019-02-25 3:42 ` David Gibson 2019-02-25 3:42 ` David Gibson 2019-02-22 11:28 ` [PATCH v2 13/16] KVM: PPC: Book3S HV: XIVE: add a mapping for the source ESB pages Cédric Le Goater 2019-02-22 11:28 ` Cédric Le Goater 2019-02-25 3:47 ` David Gibson 2019-02-25 3:47 ` David Gibson 2019-02-22 11:28 ` [PATCH v2 14/16] KVM: PPC: Book3S HV: XIVE: add passthrough support Cédric Le Goater 2019-02-22 11:28 ` Cédric Le Goater 2019-02-25 4:13 ` David Gibson 2019-02-25 4:13 ` David Gibson 2019-02-22 11:28 ` [PATCH v2 15/16] KVM: introduce a KVM_DESTROY_DEVICE ioctl Cédric Le Goater 2019-02-22 11:28 ` Cédric Le Goater 2019-02-25 4:15 ` David Gibson 2019-02-25 4:15 ` David Gibson 2019-03-13 8:02 ` Cédric Le Goater 2019-03-13 8:02 ` Cédric Le Goater 2019-03-15 17:57 ` Paolo Bonzini 2019-03-15 17:57 ` Paolo Bonzini 2019-02-22 11:28 ` [PATCH v2 16/16] KVM: PPC: Book3S HV: XIVE: clear the vCPU interrupt presenters Cédric Le Goater 2019-02-22 11:28 ` Cédric Le Goater 2019-02-25 4:18 ` David Gibson [this message] 2019-02-25 4:18 ` David Gibson 2019-03-13 8:17 ` Cédric Le Goater 2019-03-13 8:17 ` Cédric Le Goater 2019-03-14 2:26 ` David Gibson 2019-03-14 2:26 ` David Gibson
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