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path: root/drivers/xen/privcmd.c
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Diffstat (limited to 'drivers/xen/privcmd.c')
-rw-r--r--drivers/xen/privcmd.c96
1 files changed, 61 insertions, 35 deletions
diff --git a/drivers/xen/privcmd.c b/drivers/xen/privcmd.c
index 67dfa4778864..13a10f3294a8 100644
--- a/drivers/xen/privcmd.c
+++ b/drivers/xen/privcmd.c
@@ -17,6 +17,7 @@
#include <linux/poll.h>
#include <linux/sched.h>
#include <linux/slab.h>
+#include <linux/srcu.h>
#include <linux/string.h>
#include <linux/workqueue.h>
#include <linux/errno.h>
@@ -45,9 +46,13 @@
#include <xen/page.h>
#include <xen/xen-ops.h>
#include <xen/balloon.h>
+#ifdef CONFIG_XEN_ACPI
+#include <xen/acpi.h>
+#endif
#include "privcmd.h"
+MODULE_DESCRIPTION("Xen hypercall passthrough driver");
MODULE_LICENSE("GPL");
#define PRIV_VMA_LOCKED ((void *)1)
@@ -842,10 +847,34 @@ out:
return rc;
}
+static long privcmd_ioctl_pcidev_get_gsi(struct file *file, void __user *udata)
+{
+#if defined(CONFIG_XEN_ACPI)
+ int rc;
+ struct privcmd_pcidev_get_gsi kdata;
+
+ if (copy_from_user(&kdata, udata, sizeof(kdata)))
+ return -EFAULT;
+
+ rc = xen_acpi_get_gsi_from_sbdf(kdata.sbdf);
+ if (rc < 0)
+ return rc;
+
+ kdata.gsi = rc;
+ if (copy_to_user(udata, &kdata, sizeof(kdata)))
+ return -EFAULT;
+
+ return 0;
+#else
+ return -EINVAL;
+#endif
+}
+
#ifdef CONFIG_XEN_PRIVCMD_EVENTFD
/* Irqfd support */
static struct workqueue_struct *irqfd_cleanup_wq;
-static DEFINE_MUTEX(irqfds_lock);
+static DEFINE_SPINLOCK(irqfds_lock);
+DEFINE_STATIC_SRCU(irqfds_srcu);
static LIST_HEAD(irqfds_list);
struct privcmd_kernel_irqfd {
@@ -873,6 +902,9 @@ static void irqfd_shutdown(struct work_struct *work)
container_of(work, struct privcmd_kernel_irqfd, shutdown);
u64 cnt;
+ /* Make sure irqfd has been initialized in assign path */
+ synchronize_srcu(&irqfds_srcu);
+
eventfd_ctx_remove_wait_queue(kirqfd->eventfd, &kirqfd->wait, &cnt);
eventfd_ctx_put(kirqfd->eventfd);
kfree(kirqfd);
@@ -909,9 +941,11 @@ irqfd_wakeup(wait_queue_entry_t *wait, unsigned int mode, int sync, void *key)
irqfd_inject(kirqfd);
if (flags & EPOLLHUP) {
- mutex_lock(&irqfds_lock);
+ unsigned long flags;
+
+ spin_lock_irqsave(&irqfds_lock, flags);
irqfd_deactivate(kirqfd);
- mutex_unlock(&irqfds_lock);
+ spin_unlock_irqrestore(&irqfds_lock, flags);
}
return 0;
@@ -929,10 +963,12 @@ irqfd_poll_func(struct file *file, wait_queue_head_t *wqh, poll_table *pt)
static int privcmd_irqfd_assign(struct privcmd_irqfd *irqfd)
{
struct privcmd_kernel_irqfd *kirqfd, *tmp;
+ unsigned long flags;
__poll_t events;
- struct fd f;
void *dm_op;
- int ret;
+ int ret, idx;
+
+ CLASS(fd, f)(irqfd->fd);
kirqfd = kzalloc(sizeof(*kirqfd) + irqfd->size, GFP_KERNEL);
if (!kirqfd)
@@ -949,16 +985,15 @@ static int privcmd_irqfd_assign(struct privcmd_irqfd *irqfd)
kirqfd->dom = irqfd->dom;
INIT_WORK(&kirqfd->shutdown, irqfd_shutdown);
- f = fdget(irqfd->fd);
- if (!f.file) {
+ if (fd_empty(f)) {
ret = -EBADF;
goto error_kfree;
}
- kirqfd->eventfd = eventfd_ctx_fileget(f.file);
+ kirqfd->eventfd = eventfd_ctx_fileget(fd_file(f));
if (IS_ERR(kirqfd->eventfd)) {
ret = PTR_ERR(kirqfd->eventfd);
- goto error_fd_put;
+ goto error_kfree;
}
/*
@@ -968,40 +1003,34 @@ static int privcmd_irqfd_assign(struct privcmd_irqfd *irqfd)
init_waitqueue_func_entry(&kirqfd->wait, irqfd_wakeup);
init_poll_funcptr(&kirqfd->pt, irqfd_poll_func);
- mutex_lock(&irqfds_lock);
+ spin_lock_irqsave(&irqfds_lock, flags);
list_for_each_entry(tmp, &irqfds_list, list) {
if (kirqfd->eventfd == tmp->eventfd) {
ret = -EBUSY;
- mutex_unlock(&irqfds_lock);
+ spin_unlock_irqrestore(&irqfds_lock, flags);
goto error_eventfd;
}
}
+ idx = srcu_read_lock(&irqfds_srcu);
list_add_tail(&kirqfd->list, &irqfds_list);
- mutex_unlock(&irqfds_lock);
+ spin_unlock_irqrestore(&irqfds_lock, flags);
/*
* Check if there was an event already pending on the eventfd before we
* registered, and trigger it as if we didn't miss it.
*/
- events = vfs_poll(f.file, &kirqfd->pt);
+ events = vfs_poll(fd_file(f), &kirqfd->pt);
if (events & EPOLLIN)
irqfd_inject(kirqfd);
- /*
- * Do not drop the file until the kirqfd is fully initialized, otherwise
- * we might race against the EPOLLHUP.
- */
- fdput(f);
+ srcu_read_unlock(&irqfds_srcu, idx);
return 0;
error_eventfd:
eventfd_ctx_put(kirqfd->eventfd);
-error_fd_put:
- fdput(f);
-
error_kfree:
kfree(kirqfd);
return ret;
@@ -1011,12 +1040,13 @@ static int privcmd_irqfd_deassign(struct privcmd_irqfd *irqfd)
{
struct privcmd_kernel_irqfd *kirqfd;
struct eventfd_ctx *eventfd;
+ unsigned long flags;
eventfd = eventfd_ctx_fdget(irqfd->fd);
if (IS_ERR(eventfd))
return PTR_ERR(eventfd);
- mutex_lock(&irqfds_lock);
+ spin_lock_irqsave(&irqfds_lock, flags);
list_for_each_entry(kirqfd, &irqfds_list, list) {
if (kirqfd->eventfd == eventfd) {
@@ -1025,7 +1055,7 @@ static int privcmd_irqfd_deassign(struct privcmd_irqfd *irqfd)
}
}
- mutex_unlock(&irqfds_lock);
+ spin_unlock_irqrestore(&irqfds_lock, flags);
eventfd_ctx_put(eventfd);
@@ -1073,13 +1103,14 @@ static int privcmd_irqfd_init(void)
static void privcmd_irqfd_exit(void)
{
struct privcmd_kernel_irqfd *kirqfd, *tmp;
+ unsigned long flags;
- mutex_lock(&irqfds_lock);
+ spin_lock_irqsave(&irqfds_lock, flags);
list_for_each_entry_safe(kirqfd, tmp, &irqfds_list, list)
irqfd_deactivate(kirqfd);
- mutex_unlock(&irqfds_lock);
+ spin_unlock_irqrestore(&irqfds_lock, flags);
destroy_workqueue(irqfd_cleanup_wq);
}
@@ -1310,7 +1341,6 @@ static int privcmd_ioeventfd_assign(struct privcmd_ioeventfd *ioeventfd)
struct privcmd_kernel_ioeventfd *kioeventfd;
struct privcmd_kernel_ioreq *kioreq;
unsigned long flags;
- struct fd f;
int ret;
/* Check for range overflow */
@@ -1330,15 +1360,7 @@ static int privcmd_ioeventfd_assign(struct privcmd_ioeventfd *ioeventfd)
if (!kioeventfd)
return -ENOMEM;
- f = fdget(ioeventfd->event_fd);
- if (!f.file) {
- ret = -EBADF;
- goto error_kfree;
- }
-
- kioeventfd->eventfd = eventfd_ctx_fileget(f.file);
- fdput(f);
-
+ kioeventfd->eventfd = eventfd_ctx_fdget(ioeventfd->event_fd);
if (IS_ERR(kioeventfd->eventfd)) {
ret = PTR_ERR(kioeventfd->eventfd);
goto error_kfree;
@@ -1529,6 +1551,10 @@ static long privcmd_ioctl(struct file *file,
ret = privcmd_ioctl_ioeventfd(file, udata);
break;
+ case IOCTL_PRIVCMD_PCIDEV_GET_GSI:
+ ret = privcmd_ioctl_pcidev_get_gsi(file, udata);
+ break;
+
default:
break;
}
generated by cgit (git 2.34.1) at 2025-07-25 18:10:30 +0000