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qemu-kvm/SOURCES/kvm-s390x-ap-Wire-up-the-de...

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From 41987ce0dd79d8734088002cbd34f20704dd017a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= <clg@redhat.com>
Date: Mon, 17 Jul 2023 17:36:07 +0200
Subject: [PATCH 04/12] s390x/ap: Wire up the device request notifier interface
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
RH-Author: Cédric Le Goater <clg@redhat.com>
RH-MergeRequest: 185: Backport s390x fixes from QEMU 8.1
RH-Jira: RHEL-794
RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
RH-Acked-by: Thomas Huth <thuth@redhat.com>
RH-Commit: [1/1] ab6c912a1b8cdb584adacac16af79352fdfe7355 (clegoate/qemu-kvm-c9s)
Jira: https://issues.redhat.com/browse/RHEL-794
commit 1360b2ad1f673d32a09de5826cd71ecd0510164a
Author: Tony Krowiak <akrowiak@linux.ibm.com>
Date: Fri Jun 2 10:11:25 2023 -0400
s390x/ap: Wire up the device request notifier interface
Let's wire up the device request notifier interface to handle device unplug
requests for AP.
Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
Link: https://lore.kernel.org/qemu-devel/20230530225544.280031-1-akrowiak@linux.ibm.com/
Signed-off-by: Cédric Le Goater <clg@redhat.com>
Backport note:
- linux-headers/linux/vfio.h
updated to v6.5-rc1 level for VFIO_AP_REQ_IRQ_INDEX definition
Signed-off-by: Cédric Le Goater <clg@redhat.com>
---
hw/vfio/ap.c | 113 +++++++++++++++++++++++++++++++++++++
linux-headers/linux/vfio.h | 9 +++
2 files changed, 122 insertions(+)
diff --git a/hw/vfio/ap.c b/hw/vfio/ap.c
index e0dd561e85..6e21d1da5a 100644
--- a/hw/vfio/ap.c
+++ b/hw/vfio/ap.c
@@ -18,6 +18,8 @@
#include "hw/vfio/vfio-common.h"
#include "hw/s390x/ap-device.h"
#include "qemu/error-report.h"
+#include "qemu/event_notifier.h"
+#include "qemu/main-loop.h"
#include "qemu/module.h"
#include "qemu/option.h"
#include "qemu/config-file.h"
@@ -33,6 +35,7 @@
struct VFIOAPDevice {
APDevice apdev;
VFIODevice vdev;
+ EventNotifier req_notifier;
};
OBJECT_DECLARE_SIMPLE_TYPE(VFIOAPDevice, VFIO_AP_DEVICE)
@@ -84,10 +87,110 @@ static VFIOGroup *vfio_ap_get_group(VFIOAPDevice *vapdev, Error **errp)
return vfio_get_group(groupid, &address_space_memory, errp);
}
+static void vfio_ap_req_notifier_handler(void *opaque)
+{
+ VFIOAPDevice *vapdev = opaque;
+ Error *err = NULL;
+
+ if (!event_notifier_test_and_clear(&vapdev->req_notifier)) {
+ return;
+ }
+
+ qdev_unplug(DEVICE(vapdev), &err);
+
+ if (err) {
+ warn_reportf_err(err, VFIO_MSG_PREFIX, vapdev->vdev.name);
+ }
+}
+
+static void vfio_ap_register_irq_notifier(VFIOAPDevice *vapdev,
+ unsigned int irq, Error **errp)
+{
+ int fd;
+ size_t argsz;
+ IOHandler *fd_read;
+ EventNotifier *notifier;
+ struct vfio_irq_info *irq_info;
+ VFIODevice *vdev = &vapdev->vdev;
+
+ switch (irq) {
+ case VFIO_AP_REQ_IRQ_INDEX:
+ notifier = &vapdev->req_notifier;
+ fd_read = vfio_ap_req_notifier_handler;
+ break;
+ default:
+ error_setg(errp, "vfio: Unsupported device irq(%d)", irq);
+ return;
+ }
+
+ if (vdev->num_irqs < irq + 1) {
+ error_setg(errp, "vfio: IRQ %u not available (number of irqs %u)",
+ irq, vdev->num_irqs);
+ return;
+ }
+
+ argsz = sizeof(*irq_info);
+ irq_info = g_malloc0(argsz);
+ irq_info->index = irq;
+ irq_info->argsz = argsz;
+
+ if (ioctl(vdev->fd, VFIO_DEVICE_GET_IRQ_INFO,
+ irq_info) < 0 || irq_info->count < 1) {
+ error_setg_errno(errp, errno, "vfio: Error getting irq info");
+ goto out_free_info;
+ }
+
+ if (event_notifier_init(notifier, 0)) {
+ error_setg_errno(errp, errno,
+ "vfio: Unable to init event notifier for irq (%d)",
+ irq);
+ goto out_free_info;
+ }
+
+ fd = event_notifier_get_fd(notifier);
+ qemu_set_fd_handler(fd, fd_read, NULL, vapdev);
+
+ if (vfio_set_irq_signaling(vdev, irq, 0, VFIO_IRQ_SET_ACTION_TRIGGER, fd,
+ errp)) {
+ qemu_set_fd_handler(fd, NULL, NULL, vapdev);
+ event_notifier_cleanup(notifier);
+ }
+
+out_free_info:
+ g_free(irq_info);
+
+}
+
+static void vfio_ap_unregister_irq_notifier(VFIOAPDevice *vapdev,
+ unsigned int irq)
+{
+ Error *err = NULL;
+ EventNotifier *notifier;
+
+ switch (irq) {
+ case VFIO_AP_REQ_IRQ_INDEX:
+ notifier = &vapdev->req_notifier;
+ break;
+ default:
+ error_report("vfio: Unsupported device irq(%d)", irq);
+ return;
+ }
+
+ if (vfio_set_irq_signaling(&vapdev->vdev, irq, 0,
+ VFIO_IRQ_SET_ACTION_TRIGGER, -1, &err)) {
+ warn_reportf_err(err, VFIO_MSG_PREFIX, vapdev->vdev.name);
+ }
+
+ qemu_set_fd_handler(event_notifier_get_fd(notifier),
+ NULL, NULL, vapdev);
+ event_notifier_cleanup(notifier);
+}
+
static void vfio_ap_realize(DeviceState *dev, Error **errp)
{
int ret;
char *mdevid;
+ Error *err = NULL;
VFIOGroup *vfio_group;
APDevice *apdev = AP_DEVICE(dev);
VFIOAPDevice *vapdev = VFIO_AP_DEVICE(apdev);
@@ -116,6 +219,15 @@ static void vfio_ap_realize(DeviceState *dev, Error **errp)
goto out_get_dev_err;
}
+ vfio_ap_register_irq_notifier(vapdev, VFIO_AP_REQ_IRQ_INDEX, &err);
+ if (err) {
+ /*
+ * Report this error, but do not make it a failing condition.
+ * Lack of this IRQ in the host does not prevent normal operation.
+ */
+ error_report_err(err);
+ }
+
return;
out_get_dev_err:
@@ -129,6 +241,7 @@ static void vfio_ap_unrealize(DeviceState *dev)
VFIOAPDevice *vapdev = VFIO_AP_DEVICE(apdev);
VFIOGroup *group = vapdev->vdev.group;
+ vfio_ap_unregister_irq_notifier(vapdev, VFIO_AP_REQ_IRQ_INDEX);
vfio_ap_put_device(vapdev);
vfio_put_group(group);
}
diff --git a/linux-headers/linux/vfio.h b/linux-headers/linux/vfio.h
index c59692ce0b..ce464957c8 100644
--- a/linux-headers/linux/vfio.h
+++ b/linux-headers/linux/vfio.h
@@ -642,6 +642,15 @@ enum {
VFIO_CCW_NUM_IRQS
};
+/*
+ * The vfio-ap bus driver makes use of the following IRQ index mapping.
+ * Unimplemented IRQ types return a count of zero.
+ */
+enum {
+ VFIO_AP_REQ_IRQ_INDEX,
+ VFIO_AP_NUM_IRQS
+};
+
/**
* VFIO_DEVICE_GET_PCI_HOT_RESET_INFO - _IOWR(VFIO_TYPE, VFIO_BASE + 12,
* struct vfio_pci_hot_reset_info)
--
2.39.3
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