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Message-Id: <af580a244ed01e8695fc2d705d56714ac5c85481.1622654100.git.viremana@linux.microsoft.com>
Date: Wed, 2 Jun 2021 17:21:02 +0000
From: Vineeth Pillai <viremana@...ux.microsoft.com>
To: Nuno Das Neves <nunodasneves@...ux.microsoft.com>,
Wei Liu <wei.liu@...nel.org>,
Sunil Muthuswamy <sunilmut@...rosoft.com>,
Michael Kelley <mikelley@...rosoft.com>,
Vitaly Kuznetsov <vkuznets@...hat.com>
Cc: Vineeth Pillai <viremana@...ux.microsoft.com>,
"K. Y. Srinivasan" <kys@...rosoft.com>,
virtualization@...ts.linux-foundation.org,
linux-kernel@...r.kernel.org, linux-hyperv@...r.kernel.org
Subject: [PATCH 17/17] mshv: Use in kernel MSI routing for irqfd
Use the in-kernel routing information for irqfd interrupts.
Signed-off-by: Vineeth Pillai <viremana@...ux.microsoft.com>
---
drivers/hv/hv_eventfd.c | 94 +++++++++++++++++++++++++++---------
drivers/hv/mshv_msi.c | 1 +
include/linux/mshv.h | 2 +
include/linux/mshv_eventfd.h | 26 +++++-----
include/uapi/linux/mshv.h | 6 ---
5 files changed, 87 insertions(+), 42 deletions(-)
diff --git a/drivers/hv/hv_eventfd.c b/drivers/hv/hv_eventfd.c
index 6404624b3bc6..729b5f67aa9a 100644
--- a/drivers/hv/hv_eventfd.c
+++ b/drivers/hv/hv_eventfd.c
@@ -88,13 +88,32 @@ irqfd_resampler_ack(struct mshv_irq_ack_notifier *mian)
static void
irqfd_inject(struct mshv_kernel_irqfd *irqfd)
{
+ struct mshv_partition *partition = irqfd->partition;
struct mshv_lapic_irq *irq = &irqfd->lapic_irq;
+ unsigned int seq;
+ int idx;
WARN_ON(irqfd->resampler &&
!irq->control.level_triggered);
+
+ idx = srcu_read_lock(&partition->irq_srcu);
+ if (irqfd->msi_entry.gsi) {
+ if (!irqfd->msi_entry.entry_valid) {
+ pr_warn("Invalid routing info for gsi %u",
+ irqfd->msi_entry.gsi);
+ srcu_read_unlock(&partition->irq_srcu, idx);
+ return;
+ }
+
+ do {
+ seq = read_seqcount_begin(&irqfd->msi_entry_sc);
+ } while (read_seqcount_retry(&irqfd->msi_entry_sc, seq));
+ }
+
hv_call_assert_virtual_interrupt(irqfd->partition->id,
irq->vector, irq->apic_id,
irq->control);
+ srcu_read_unlock(&partition->irq_srcu, idx);
}
static void
@@ -206,6 +225,27 @@ irqfd_wakeup(wait_queue_entry_t *wait, unsigned int mode,
return 0;
}
+/* Must be called under irqfds.lock */
+static void irqfd_update(struct mshv_partition *partition,
+ struct mshv_kernel_irqfd *irqfd)
+{
+ write_seqcount_begin(&irqfd->msi_entry_sc);
+ irqfd->msi_entry = mshv_msi_map_gsi(partition, irqfd->gsi);
+ mshv_set_msi_irq(&irqfd->msi_entry, &irqfd->lapic_irq);
+ write_seqcount_end(&irqfd->msi_entry_sc);
+}
+
+void mshv_irqfd_routing_update(struct mshv_partition *partition)
+{
+ struct mshv_kernel_irqfd *irqfd;
+
+ spin_lock_irq(&partition->irqfds.lock);
+ list_for_each_entry(irqfd, &partition->irqfds.items, list) {
+ irqfd_update(partition, irqfd);
+ }
+ spin_unlock_irq(&partition->irqfds.lock);
+}
+
static void
irqfd_ptable_queue_proc(struct file *file, wait_queue_head_t *wqh,
poll_table *pt)
@@ -221,29 +261,23 @@ static int
mshv_irqfd_assign(struct mshv_partition *partition,
struct mshv_irqfd *args)
{
+ struct eventfd_ctx *eventfd = NULL, *resamplefd = NULL;
struct mshv_kernel_irqfd *irqfd, *tmp;
+ unsigned int events;
struct fd f;
- struct eventfd_ctx *eventfd = NULL, *resamplefd = NULL;
int ret;
- unsigned int events;
+ int idx;
irqfd = kzalloc(sizeof(*irqfd), GFP_KERNEL);
if (!irqfd)
return -ENOMEM;
- if (args->flags & MSHV_IRQFD_FLAG_RESAMPLE &&
- !args->level_triggered)
- return -EINVAL;
-
irqfd->partition = partition;
irqfd->gsi = args->gsi;
- irqfd->lapic_irq.vector = args->vector;
- irqfd->lapic_irq.apic_id = args->apic_id;
- irqfd->lapic_irq.control.interrupt_type = args->interrupt_type;
- irqfd->lapic_irq.control.level_triggered = args->level_triggered;
- irqfd->lapic_irq.control.logical_dest_mode = args->logical_dest_mode;
INIT_LIST_HEAD(&irqfd->list);
INIT_WORK(&irqfd->shutdown, irqfd_shutdown);
+ seqcount_spinlock_init(&irqfd->msi_entry_sc,
+ &partition->irqfds.lock);
f = fdget(args->fd);
if (!f.file) {
@@ -259,6 +293,31 @@ mshv_irqfd_assign(struct mshv_partition *partition,
irqfd->eventfd = eventfd;
+
+ spin_lock_irq(&partition->irqfds.lock);
+ idx = srcu_read_lock(&partition->irq_srcu);
+ irqfd_update(partition, irqfd);
+ srcu_read_unlock(&partition->irq_srcu, idx);
+
+ if (args->flags & MSHV_IRQFD_FLAG_RESAMPLE &&
+ !irqfd->lapic_irq.control.level_triggered) {
+ spin_unlock_irq(&partition->irqfds.lock);
+ ret = -EINVAL;
+ goto fail;
+ }
+
+ ret = 0;
+ list_for_each_entry(tmp, &partition->irqfds.items, list) {
+ if (irqfd->eventfd != tmp->eventfd)
+ continue;
+ /* This fd is used for another irq already. */
+ ret = -EBUSY;
+ spin_unlock_irq(&partition->irqfds.lock);
+ goto fail;
+ }
+ list_add_tail(&irqfd->list, &partition->irqfds.items);
+ spin_unlock_irq(&partition->irqfds.lock);
+
if (args->flags & MSHV_IRQFD_FLAG_RESAMPLE) {
struct mshv_kernel_irqfd_resampler *resampler;
@@ -314,19 +373,6 @@ mshv_irqfd_assign(struct mshv_partition *partition,
init_waitqueue_func_entry(&irqfd->wait, irqfd_wakeup);
init_poll_funcptr(&irqfd->pt, irqfd_ptable_queue_proc);
- spin_lock_irq(&partition->irqfds.lock);
- ret = 0;
- list_for_each_entry(tmp, &partition->irqfds.items, list) {
- if (irqfd->eventfd != tmp->eventfd)
- continue;
- /* This fd is used for another irq already. */
- ret = -EBUSY;
- spin_unlock_irq(&partition->irqfds.lock);
- goto fail;
- }
- list_add_tail(&irqfd->list, &partition->irqfds.items);
- spin_unlock_irq(&partition->irqfds.lock);
-
/*
* Check if there was an event already pending on the eventfd
* before we registered, and trigger it as if we didn't miss it.
diff --git a/drivers/hv/mshv_msi.c b/drivers/hv/mshv_msi.c
index ae25ed8dfef4..c5dc9c6fe4d5 100644
--- a/drivers/hv/mshv_msi.c
+++ b/drivers/hv/mshv_msi.c
@@ -71,6 +71,7 @@ int mshv_set_msi_routing(struct mshv_partition *partition,
spin_lock(&partition->irq_lock);
old = rcu_dereference_protected(partition->msi_routing, 1);
rcu_assign_pointer(partition->msi_routing, new);
+ mshv_irqfd_routing_update(partition);
spin_unlock(&partition->irq_lock);
synchronize_srcu_expedited(&partition->irq_srcu);
diff --git a/include/linux/mshv.h b/include/linux/mshv.h
index ec349be0ba91..fc655b60c5cd 100644
--- a/include/linux/mshv.h
+++ b/include/linux/mshv.h
@@ -104,6 +104,8 @@ struct mshv_kernel_msi_routing_entry mshv_msi_map_gsi(
void mshv_set_msi_irq(struct mshv_kernel_msi_routing_entry *e,
struct mshv_lapic_irq *irq);
+void mshv_irqfd_routing_update(struct mshv_partition *partition);
+
struct hv_synic_pages {
struct hv_message_page *synic_message_page;
struct hv_synic_event_flags_page *synic_event_flags_page;
diff --git a/include/linux/mshv_eventfd.h b/include/linux/mshv_eventfd.h
index fa5d46d2eb85..a24ca167f3e9 100644
--- a/include/linux/mshv_eventfd.h
+++ b/include/linux/mshv_eventfd.h
@@ -39,20 +39,22 @@ struct mshv_kernel_irqfd_resampler {
};
struct mshv_kernel_irqfd {
- struct mshv_partition *partition;
- struct eventfd_ctx *eventfd;
- u32 gsi;
- struct mshv_lapic_irq lapic_irq;
- struct list_head list;
- poll_table pt;
- wait_queue_head_t *wqh;
- wait_queue_entry_t wait;
- struct work_struct shutdown;
+ struct mshv_partition *partition;
+ struct eventfd_ctx *eventfd;
+ struct mshv_kernel_msi_routing_entry msi_entry;
+ seqcount_spinlock_t msi_entry_sc;
+ u32 gsi;
+ struct mshv_lapic_irq lapic_irq;
+ struct list_head list;
+ poll_table pt;
+ wait_queue_head_t *wqh;
+ wait_queue_entry_t wait;
+ struct work_struct shutdown;
/* Resampler related */
- struct mshv_kernel_irqfd_resampler *resampler;
- struct eventfd_ctx *resamplefd;
- struct list_head resampler_link;
+ struct mshv_kernel_irqfd_resampler *resampler;
+ struct eventfd_ctx *resamplefd;
+ struct list_head resampler_link;
};
int mshv_irqfd(struct mshv_partition *partition,
diff --git a/include/uapi/linux/mshv.h b/include/uapi/linux/mshv.h
index ac58f2ded79c..b5826120ba7c 100644
--- a/include/uapi/linux/mshv.h
+++ b/include/uapi/linux/mshv.h
@@ -83,16 +83,10 @@ struct mshv_translate_gva {
#define MSHV_IRQFD_FLAG_RESAMPLE (1 << 1)
struct mshv_irqfd {
- __u64 apic_id;
__s32 fd;
__s32 resamplefd;
__u32 gsi;
- __u32 vector;
- __u32 interrupt_type;
__u32 flags;
- __u8 level_triggered;
- __u8 logical_dest_mode;
- __u8 pad[6];
};
enum {
--
2.25.1
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