lkml.org 
[lkml]   [2020]   [Jun]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v2 4/8] virt: vbox: Add vbg_set_host_capabilities() helper function
Date
Add vbg_set_host_capabilities() helper function,  this is a preparation
patch for adding support for the VBGL_IOCTL_GUEST_CAPS_ACQUIRE ioctl.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
drivers/virt/vboxguest/vboxguest_core.c | 79 ++++++++++++++-----------
1 file changed, 46 insertions(+), 33 deletions(-)

diff --git a/drivers/virt/vboxguest/vboxguest_core.c b/drivers/virt/vboxguest/vboxguest_core.c
index aee5eff229f2..15b3cb618c6e 100644
--- a/drivers/virt/vboxguest/vboxguest_core.c
+++ b/drivers/virt/vboxguest/vboxguest_core.c
@@ -661,6 +661,48 @@ static int vbg_reset_host_capabilities(struct vbg_dev *gdev)
return vbg_status_code_to_errno(rc);
}

+/**
+ * Set guest capabilities on the host.
+ * Must be called with gdev->session_mutex hold.
+ * Return: 0 or negative errno value.
+ * @gdev: The Guest extension device.
+ * @session: The session.
+ * @session_termination: Set if we're called by the session cleanup code.
+ */
+static int vbg_set_host_capabilities(struct vbg_dev *gdev,
+ struct vbg_session *session,
+ bool session_termination)
+{
+ struct vmmdev_mask *req;
+ u32 caps;
+ int rc;
+
+ WARN_ON(!mutex_is_locked(&gdev->session_mutex));
+
+ caps = gdev->set_guest_caps_tracker.mask;
+
+ if (gdev->guest_caps_host == caps)
+ return 0;
+
+ /* On termination the requestor is the kernel, as we're cleaning up. */
+ req = vbg_req_alloc(sizeof(*req), VMMDEVREQ_SET_GUEST_CAPABILITIES,
+ session_termination ? VBG_KERNEL_REQUEST :
+ session->requestor);
+ if (!req) {
+ gdev->guest_caps_host = U32_MAX;
+ return -ENOMEM;
+ }
+
+ req->or_mask = caps;
+ req->not_mask = ~caps;
+ rc = vbg_req_perform(gdev, req);
+ vbg_req_free(req, sizeof(*req));
+
+ gdev->guest_caps_host = (rc >= 0) ? caps : U32_MAX;
+
+ return vbg_status_code_to_errno(rc);
+}
+
/**
* Sets the guest capabilities for a session. Takes the session spinlock.
* Return: 0 or negative errno value.
@@ -678,23 +720,8 @@ static int vbg_set_session_capabilities(struct vbg_dev *gdev,
u32 or_mask, u32 not_mask,
bool session_termination)
{
- struct vmmdev_mask *req;
u32 changed, previous;
- int rc, ret = 0;
-
- /*
- * Allocate a request buffer before taking the spinlock, when
- * the session is being terminated the requestor is the kernel,
- * as we're cleaning up.
- */
- req = vbg_req_alloc(sizeof(*req), VMMDEVREQ_SET_GUEST_CAPABILITIES,
- session_termination ? VBG_KERNEL_REQUEST :
- session->requestor);
- if (!req) {
- if (!session_termination)
- return -ENOMEM;
- /* Ignore allocation failure, we must do session cleanup. */
- }
+ int ret = 0;

mutex_lock(&gdev->session_mutex);

@@ -709,23 +736,10 @@ static int vbg_set_session_capabilities(struct vbg_dev *gdev,
goto out;

vbg_track_bit_usage(&gdev->set_guest_caps_tracker, changed, previous);
- or_mask = gdev->set_guest_caps_tracker.mask;
-
- if (gdev->guest_caps_host == or_mask || !req)
- goto out;
-
- gdev->guest_caps_host = or_mask;
- req->or_mask = or_mask;
- req->not_mask = ~or_mask;
- rc = vbg_req_perform(gdev, req);
- if (rc < 0) {
- ret = vbg_status_code_to_errno(rc);
-
- /* Failed, roll back (unless it's session termination time). */
- gdev->guest_caps_host = U32_MAX;
- if (session_termination)
- goto out;

+ ret = vbg_set_host_capabilities(gdev, session, session_termination);
+ /* Roll back on failure, unless it's session termination time. */
+ if (ret < 0 && !session_termination) {
vbg_track_bit_usage(&gdev->set_guest_caps_tracker, changed,
session->set_guest_caps);
session->set_guest_caps = previous;
@@ -733,7 +747,6 @@ static int vbg_set_session_capabilities(struct vbg_dev *gdev,

out:
mutex_unlock(&gdev->session_mutex);
- vbg_req_free(req, sizeof(*req));

return ret;
}
--
2.26.2
\
 
 \ /
  Last update: 2020-06-23 16:28    [W:0.070 / U:0.680 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site