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virt: vbox: Add vbg_set_host_capabilities() helper function

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Add vbg_set_host_capabilities() helper function,  this is a preparation
patch for adding support for the VBGL_IOCTL_GUEST_CAPS_ACQUIRE ioctl.

Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20200709120858.63928-5-hdegoede@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hans de Goede 2020-07-09 14:08:54 +02:00 committed by Greg Kroah-Hartman
parent fd01cc5903
commit 412f84cff0
1 changed files with 46 additions and 33 deletions
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79
drivers/virt/vboxguest/vboxguest_core.c
View File

@ -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;
}