From: Matthew Rosato <mjrosato@linux.ibm.com>
To: linux-s390@vger.kernel.org
Cc: alex.williamson@redhat.com, cohuck@redhat.com,
schnelle@linux.ibm.com, farman@linux.ibm.com,
pmorel@linux.ibm.com, borntraeger@linux.ibm.com,
hca@linux.ibm.com, gor@linux.ibm.com,
gerald.schaefer@linux.ibm.com, agordeev@linux.ibm.com,
svens@linux.ibm.com, frankja@linux.ibm.com, david@redhat.com,
imbrenda@linux.ibm.com, vneethv@linux.ibm.com,
oberpar@linux.ibm.com, freude@linux.ibm.com, thuth@redhat.com,
pasic@linux.ibm.com, joro@8bytes.org, will@kernel.org,
pbonzini@redhat.com, corbet@lwn.net, jgg@nvidia.com,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
iommu@lists.linux-foundation.org, linux-doc@vger.kernel.org
Subject: [PATCH v4 19/32] KVM: s390: pci: do initial setup for AEN interpretation
Date: Mon, 14 Mar 2022 15:44:38 -0400 [thread overview]
Message-ID: <20220314194451.58266-20-mjrosato@linux.ibm.com> (raw)
In-Reply-To: <20220314194451.58266-1-mjrosato@linux.ibm.com>
Initial setup for Adapter Event Notification Interpretation for zPCI
passthrough devices. Specifically, allocate a structure for forwarding of
adapter events and pass the address of this structure to firmware.
Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
---
arch/s390/include/asm/pci.h | 4 +
arch/s390/include/asm/pci_insn.h | 12 +++
arch/s390/kvm/interrupt.c | 14 +++
arch/s390/kvm/kvm-s390.c | 9 ++
arch/s390/kvm/pci.c | 154 +++++++++++++++++++++++++++++++
arch/s390/kvm/pci.h | 42 +++++++++
arch/s390/pci/pci.c | 6 ++
7 files changed, 241 insertions(+)
create mode 100644 arch/s390/kvm/pci.h
diff --git a/arch/s390/include/asm/pci.h b/arch/s390/include/asm/pci.h
index 4faff673078b..1ae49330d1c8 100644
--- a/arch/s390/include/asm/pci.h
+++ b/arch/s390/include/asm/pci.h
@@ -9,6 +9,7 @@
#include <asm-generic/pci.h>
#include <asm/pci_clp.h>
#include <asm/pci_debug.h>
+#include <asm/pci_insn.h>
#include <asm/sclp.h>
#define PCIBIOS_MIN_IO 0x1000
@@ -204,6 +205,9 @@ extern const struct attribute_group *zpci_attr_groups[];
extern unsigned int s390_pci_force_floating __initdata;
extern unsigned int s390_pci_no_rid;
+extern union zpci_sic_iib *zpci_aipb;
+extern struct airq_iv *zpci_aif_sbv;
+
/* -----------------------------------------------------------------------------
Prototypes
----------------------------------------------------------------------------- */
diff --git a/arch/s390/include/asm/pci_insn.h b/arch/s390/include/asm/pci_insn.h
index 32759c407b8f..ad9000295c82 100644
--- a/arch/s390/include/asm/pci_insn.h
+++ b/arch/s390/include/asm/pci_insn.h
@@ -101,6 +101,7 @@ struct zpci_fib {
/* Set Interruption Controls Operation Controls */
#define SIC_IRQ_MODE_ALL 0
#define SIC_IRQ_MODE_SINGLE 1
+#define SIC_SET_AENI_CONTROLS 2
#define SIC_IRQ_MODE_DIRECT 4
#define SIC_IRQ_MODE_D_ALL 16
#define SIC_IRQ_MODE_D_SINGLE 17
@@ -127,9 +128,20 @@ struct zpci_cdiib {
u64 : 64;
} __packed __aligned(8);
+/* adapter interruption parameters block */
+struct zpci_aipb {
+ u64 faisb;
+ u64 gait;
+ u16 : 13;
+ u16 afi : 3;
+ u32 : 32;
+ u16 faal;
+} __packed __aligned(8);
+
union zpci_sic_iib {
struct zpci_diib diib;
struct zpci_cdiib cdiib;
+ struct zpci_aipb aipb;
};
DECLARE_STATIC_KEY_FALSE(have_mio);
diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index 65e75ca2fc5d..17c7deb516d2 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -32,6 +32,7 @@
#include "kvm-s390.h"
#include "gaccess.h"
#include "trace-s390.h"
+#include "pci.h"
#define PFAULT_INIT 0x0600
#define PFAULT_DONE 0x0680
@@ -3286,6 +3287,11 @@ void kvm_s390_gib_destroy(void)
{
if (!gib)
return;
+ if (IS_ENABLED(CONFIG_VFIO_PCI) && sclp.has_aeni && aift) {
+ mutex_lock(&aift->aift_lock);
+ kvm_s390_pci_aen_exit();
+ mutex_unlock(&aift->aift_lock);
+ }
chsc_sgib(0);
unregister_adapter_interrupt(&gib_alert_irq);
free_page((unsigned long)gib);
@@ -3323,6 +3329,14 @@ int kvm_s390_gib_init(u8 nisc)
goto out_unreg_gal;
}
+ if (IS_ENABLED(CONFIG_VFIO_PCI) && sclp.has_aeni) {
+ if (kvm_s390_pci_aen_init(nisc)) {
+ pr_err("Initializing AEN for PCI failed\n");
+ rc = -EIO;
+ goto out_unreg_gal;
+ }
+ }
+
KVM_EVENT(3, "gib 0x%pK (nisc=%d) initialized", gib, gib->nisc);
goto out;
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 2296b1ff1e02..d89cd16b57dd 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -48,6 +48,7 @@
#include <asm/fpu/api.h>
#include "kvm-s390.h"
#include "gaccess.h"
+#include "pci.h"
#define CREATE_TRACE_POINTS
#include "trace.h"
@@ -503,6 +504,14 @@ int kvm_arch_init(void *opaque)
goto out;
}
+ if (IS_ENABLED(CONFIG_VFIO_PCI)) {
+ rc = kvm_s390_pci_init();
+ if (rc) {
+ pr_err("Unable to allocate AIFT for PCI\n");
+ goto out;
+ }
+ }
+
rc = kvm_s390_gib_init(GAL_ISC);
if (rc)
goto out;
diff --git a/arch/s390/kvm/pci.c b/arch/s390/kvm/pci.c
index 612faf87126d..1c42d25de697 100644
--- a/arch/s390/kvm/pci.c
+++ b/arch/s390/kvm/pci.c
@@ -10,6 +10,148 @@
#include <linux/kvm_host.h>
#include <linux/pci.h>
#include <asm/kvm_pci.h>
+#include <asm/pci.h>
+#include <asm/pci_insn.h>
+#include "pci.h"
+
+struct zpci_aift *aift;
+
+static inline int __set_irq_noiib(u16 ctl, u8 isc)
+{
+ union zpci_sic_iib iib = {{0}};
+
+ return zpci_set_irq_ctrl(ctl, isc, &iib);
+}
+
+/* Caller must hold the aift lock before calling this function */
+void kvm_s390_pci_aen_exit(void)
+{
+ unsigned long flags;
+ struct kvm_zdev **gait_kzdev;
+
+ /*
+ * Contents of the aipb remain registered for the life of the host
+ * kernel, the information preserved in zpci_aipb and zpci_aif_sbv
+ * in case we insert the KVM module again later. Clear the AIFT
+ * information and free anything not registered with underlying
+ * firmware.
+ */
+ spin_lock_irqsave(&aift->gait_lock, flags);
+ gait_kzdev = aift->kzdev;
+ aift->gait = 0;
+ aift->sbv = 0;
+ aift->kzdev = 0;
+ spin_unlock_irqrestore(&aift->gait_lock, flags);
+
+ kfree(gait_kzdev);
+}
+
+static int zpci_setup_aipb(u8 nisc)
+{
+ struct page *page;
+ int size, rc;
+
+ zpci_aipb = kzalloc(sizeof(union zpci_sic_iib), GFP_KERNEL);
+ if (!zpci_aipb)
+ return -ENOMEM;
+
+ aift->sbv = airq_iv_create(ZPCI_NR_DEVICES, AIRQ_IV_ALLOC, 0);
+ if (!aift->sbv) {
+ rc = -ENOMEM;
+ goto free_aipb;
+ }
+ zpci_aif_sbv = aift->sbv;
+ size = get_order(PAGE_ALIGN(ZPCI_NR_DEVICES *
+ sizeof(struct zpci_gaite)));
+ page = alloc_pages(GFP_KERNEL | __GFP_ZERO, size);
+ if (!page) {
+ rc = -ENOMEM;
+ goto free_sbv;
+ }
+ aift->gait = (struct zpci_gaite *)page_to_phys(page);
+
+ zpci_aipb->aipb.faisb = virt_to_phys(aift->sbv->vector);
+ zpci_aipb->aipb.gait = virt_to_phys(aift->gait);
+ zpci_aipb->aipb.afi = nisc;
+ zpci_aipb->aipb.faal = ZPCI_NR_DEVICES;
+
+ /* Setup Adapter Event Notification Interpretation */
+ if (zpci_set_irq_ctrl(SIC_SET_AENI_CONTROLS, 0, zpci_aipb)) {
+ rc = -EIO;
+ goto free_gait;
+ }
+
+ return 0;
+
+free_gait:
+ size = get_order(PAGE_ALIGN(ZPCI_NR_DEVICES *
+ sizeof(struct zpci_gaite)));
+ free_pages((unsigned long)aift->gait, size);
+free_sbv:
+ airq_iv_release(aift->sbv);
+ zpci_aif_sbv = 0;
+free_aipb:
+ kfree(zpci_aipb);
+ zpci_aipb = 0;
+
+ return rc;
+}
+
+static int zpci_reset_aipb(u8 nisc)
+{
+ /*
+ * AEN registration can only happen once per system boot. If
+ * an aipb already exists then AEN was already registered and
+ * we can re-use the aipb contents. This can only happen if
+ * the KVM module was removed and re-inserted.
+ */
+ if (zpci_aipb->aipb.faal != ZPCI_NR_DEVICES ||
+ zpci_aipb->aipb.afi != nisc) {
+ return -EINVAL;
+ }
+ aift->sbv = zpci_aif_sbv;
+ aift->gait = (struct zpci_gaite *)zpci_aipb->aipb.gait;
+
+ return 0;
+}
+
+int kvm_s390_pci_aen_init(u8 nisc)
+{
+ int rc = 0;
+
+ /* If already enabled for AEN, bail out now */
+ if (aift->gait || aift->sbv)
+ return -EPERM;
+
+ mutex_lock(&aift->aift_lock);
+ aift->kzdev = kcalloc(ZPCI_NR_DEVICES, sizeof(struct kvm_zdev),
+ GFP_KERNEL);
+ if (!aift->kzdev) {
+ rc = -ENOMEM;
+ goto unlock;
+ }
+
+ if (!zpci_aipb)
+ rc = zpci_setup_aipb(nisc);
+ else
+ rc = zpci_reset_aipb(nisc);
+ if (rc)
+ goto free_zdev;
+
+ /* Enable floating IRQs */
+ if (__set_irq_noiib(SIC_IRQ_MODE_SINGLE, nisc)) {
+ rc = -EIO;
+ kvm_s390_pci_aen_exit();
+ }
+
+ goto unlock;
+
+free_zdev:
+ kfree(aift->kzdev);
+unlock:
+ mutex_unlock(&aift->aift_lock);
+ return rc;
+}
int kvm_s390_pci_dev_open(struct zpci_dev *zdev)
{
@@ -36,3 +178,15 @@ void kvm_s390_pci_dev_release(struct zpci_dev *zdev)
kfree(kzdev);
}
EXPORT_SYMBOL_GPL(kvm_s390_pci_dev_release);
+
+int kvm_s390_pci_init(void)
+{
+ aift = kzalloc(sizeof(struct zpci_aift), GFP_KERNEL);
+ if (!aift)
+ return -ENOMEM;
+
+ spin_lock_init(&aift->gait_lock);
+ mutex_init(&aift->aift_lock);
+
+ return 0;
+}
diff --git a/arch/s390/kvm/pci.h b/arch/s390/kvm/pci.h
new file mode 100644
index 000000000000..19609d7a53a7
--- /dev/null
+++ b/arch/s390/kvm/pci.h
@@ -0,0 +1,42 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * s390 kvm PCI passthrough support
+ *
+ * Copyright IBM Corp. 2022
+ *
+ * Author(s): Matthew Rosato <mjrosato@linux.ibm.com>
+ */
+
+#ifndef __KVM_S390_PCI_H
+#define __KVM_S390_PCI_H
+
+#include <linux/pci.h>
+#include <linux/mutex.h>
+#include <asm/airq.h>
+#include <asm/kvm_pci.h>
+
+struct zpci_gaite {
+ u32 gisa;
+ u8 gisc;
+ u8 count;
+ u8 reserved;
+ u8 aisbo;
+ u64 aisb;
+};
+
+struct zpci_aift {
+ struct zpci_gaite *gait;
+ struct airq_iv *sbv;
+ struct kvm_zdev **kzdev;
+ spinlock_t gait_lock; /* Protects the gait, used during AEN forward */
+ struct mutex aift_lock; /* Protects the other structures in aift */
+};
+
+extern struct zpci_aift *aift;
+
+int kvm_s390_pci_aen_init(u8 nisc);
+void kvm_s390_pci_aen_exit(void);
+
+int kvm_s390_pci_init(void);
+
+#endif /* __KVM_S390_PCI_H */
diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c
index 04c16312ad54..13033717cd4e 100644
--- a/arch/s390/pci/pci.c
+++ b/arch/s390/pci/pci.c
@@ -61,6 +61,12 @@ DEFINE_STATIC_KEY_FALSE(have_mio);
static struct kmem_cache *zdev_fmb_cache;
+/* AEN structures that must be preserved over KVM module re-insertion */
+union zpci_sic_iib *zpci_aipb;
+EXPORT_SYMBOL_GPL(zpci_aipb);
+struct airq_iv *zpci_aif_sbv;
+EXPORT_SYMBOL_GPL(zpci_aif_sbv);
+
struct zpci_dev *get_zdev_by_fid(u32 fid)
{
struct zpci_dev *tmp, *zdev = NULL;
--
2.27.0
next prev parent reply other threads:[~2022-03-14 19:49 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-14 19:44 [PATCH v4 00/32] KVM: s390: enable zPCI for interpretive execution Matthew Rosato
2022-03-14 19:44 ` [PATCH v4 01/32] s390/sclp: detect the zPCI load/store interpretation facility Matthew Rosato
2022-03-14 19:44 ` [PATCH v4 02/32] s390/sclp: detect the AISII facility Matthew Rosato
2022-03-14 19:44 ` [PATCH v4 03/32] s390/sclp: detect the AENI facility Matthew Rosato
2022-03-14 19:44 ` [PATCH v4 04/32] s390/sclp: detect the AISI facility Matthew Rosato
2022-03-14 19:44 ` [PATCH v4 05/32] s390/airq: pass more TPI info to airq handlers Matthew Rosato
2022-03-14 19:44 ` [PATCH v4 06/32] s390/airq: allow for airq structure that uses an input vector Matthew Rosato
2022-03-14 19:44 ` [PATCH v4 07/32] s390/pci: externalize the SIC operation controls and routine Matthew Rosato
2022-03-14 19:44 ` [PATCH v4 08/32] s390/pci: stash associated GISA designation Matthew Rosato
2022-03-14 19:44 ` [PATCH v4 09/32] s390/pci: export some routines related to RPCIT processing Matthew Rosato
2022-03-14 19:44 ` [PATCH v4 10/32] s390/pci: stash dtsm and maxstbl Matthew Rosato
2022-03-14 19:44 ` [PATCH v4 11/32] s390/pci: add helper function to find device by handle Matthew Rosato
2022-03-14 19:44 ` [PATCH v4 12/32] s390/pci: get SHM information from list pci Matthew Rosato
2022-03-14 19:44 ` [PATCH v4 13/32] s390/pci: return status from zpci_refresh_trans Matthew Rosato
2022-03-14 19:44 ` [PATCH v4 14/32] iommu: introduce iommu_domain_alloc_type and the KVM type Matthew Rosato
2022-03-14 21:36 ` Jason Gunthorpe
2022-03-15 10:49 ` Robin Murphy
2022-03-17 5:47 ` Tian, Kevin
2022-03-17 13:52 ` Jason Gunthorpe
2022-03-18 2:23 ` Tian, Kevin
2022-03-18 14:13 ` Jason Gunthorpe
2022-03-19 7:51 ` Tian, Kevin
2022-03-21 14:07 ` Jason Gunthorpe
2022-03-22 7:30 ` Tian, Kevin
2022-03-14 19:44 ` [PATCH v4 15/32] vfio: introduce KVM-owned IOMMU type Matthew Rosato
2022-03-14 21:38 ` Jason Gunthorpe
2022-03-15 13:49 ` Matthew Rosato
2022-03-15 14:38 ` Jason Gunthorpe
2022-03-15 16:29 ` Matthew Rosato
2022-03-15 17:25 ` Jason Gunthorpe
2022-03-17 18:51 ` Matthew Rosato
2022-03-14 22:50 ` Alex Williamson
2022-03-14 23:18 ` Jason Gunthorpe
2022-03-15 7:57 ` Tian, Kevin
2022-03-15 14:17 ` Matthew Rosato
2022-03-15 17:01 ` Matthew Rosato
2022-03-15 13:36 ` Matthew Rosato
2022-03-15 14:55 ` Jason Gunthorpe
2022-03-15 16:04 ` Matthew Rosato
2022-03-15 17:18 ` Jason Gunthorpe
2022-03-18 7:01 ` Tian, Kevin
2022-03-18 13:46 ` Jason Gunthorpe
2022-03-19 7:47 ` Tian, Kevin
2022-03-14 19:44 ` [PATCH v4 16/32] vfio-pci/zdev: add function handle to clp base capability Matthew Rosato
2022-03-14 19:44 ` [PATCH v4 17/32] KVM: s390: pci: add basic kvm_zdev structure Matthew Rosato
2022-03-14 19:44 ` [PATCH v4 18/32] iommu/s390: add support for IOMMU_DOMAIN_KVM Matthew Rosato
2022-03-14 19:44 ` Matthew Rosato [this message]
2022-03-14 19:44 ` [PATCH v4 20/32] KVM: s390: pci: enable host forwarding of Adapter Event Notifications Matthew Rosato
2022-03-14 19:44 ` [PATCH v4 21/32] KVM: s390: mechanism to enable guest zPCI Interpretation Matthew Rosato
2022-03-14 19:44 ` [PATCH v4 22/32] KVM: s390: pci: routines for (dis)associating zPCI devices with a KVM Matthew Rosato
2022-03-14 21:46 ` Jason Gunthorpe
2022-03-15 16:39 ` Matthew Rosato
2022-03-14 19:44 ` [PATCH v4 23/32] KVM: s390: pci: provide routines for enabling/disabling interpretation Matthew Rosato
2022-03-14 19:44 ` [PATCH v4 24/32] KVM: s390: pci: provide routines for enabling/disabling interrupt forwarding Matthew Rosato
2022-03-14 19:44 ` [PATCH v4 25/32] KVM: s390: pci: provide routines for enabling/disabling IOAT assist Matthew Rosato
2022-03-14 19:44 ` [PATCH v4 26/32] KVM: s390: pci: handle refresh of PCI translations Matthew Rosato
2022-03-14 19:44 ` [PATCH v4 27/32] KVM: s390: intercept the rpcit instruction Matthew Rosato
2022-03-14 19:44 ` [PATCH v4 28/32] KVM: s390: add KVM_S390_ZPCI_OP to manage guest zPCI devices Matthew Rosato
2022-03-14 19:44 ` [PATCH v4 29/32] vfio-pci/zdev: add DTSM to clp group capability Matthew Rosato
2022-03-14 21:49 ` Jason Gunthorpe
2022-03-15 14:39 ` Matthew Rosato
2022-03-15 14:56 ` Jason Gunthorpe
2022-03-14 19:44 ` [PATCH v4 30/32] KVM: s390: introduce CPU feature for zPCI Interpretation Matthew Rosato
2022-03-14 19:44 ` [PATCH v4 31/32] MAINTAINERS: additional files related kvm s390 pci passthrough Matthew Rosato
2022-03-14 19:44 ` [PATCH v4 32/32] MAINTAINERS: update s390 IOMMU entry Matthew Rosato
2022-03-14 19:52 ` [PATCH v4 00/32] KVM: s390: enable zPCI for interpretive execution Matthew Rosato
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