d176dfce22
* Tue Jun 30 2020 Fedora Kernel Team <kernel-team@fedoraproject.org> [5.8.0-0.rc3.20200630git7c30b859a947.1] - 7c30b859a947 rebase - Updated changelog for the release based on v5.8-rc3 (Fedora Kernel Team) Resolves: rhbz# Signed-off-by: Justin M. Forbes <jforbes@fedoraproject.org>
131 lines
4.0 KiB
Diff
131 lines
4.0 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Hans de Goede <hdegoede@redhat.com>
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Date: Tue, 19 May 2020 15:30:29 +0200
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Subject: [PATCH] virt: vbox: Add vbg_set_host_capabilities() helper function
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Add vbg_set_host_capabilities() helper function, this is a preparation
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patch for adding support for the VBGL_IOCTL_GUEST_CAPS_ACQUIRE ioctl.
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Signed-off-by: Hans de Goede <hdegoede@redhat.com>
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Upstream Status: https://lore.kernel.org/lkml/20200520195440.38759-1-hdegoede@redhat.com/
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---
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drivers/virt/vboxguest/vboxguest_core.c | 79 ++++++++++++++-----------
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1 file changed, 46 insertions(+), 33 deletions(-)
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diff --git a/drivers/virt/vboxguest/vboxguest_core.c b/drivers/virt/vboxguest/vboxguest_core.c
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index aee5eff229f2..15b3cb618c6e 100644
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--- a/drivers/virt/vboxguest/vboxguest_core.c
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+++ b/drivers/virt/vboxguest/vboxguest_core.c
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@@ -661,6 +661,48 @@ static int vbg_reset_host_capabilities(struct vbg_dev *gdev)
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return vbg_status_code_to_errno(rc);
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}
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+/**
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+ * Set guest capabilities on the host.
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+ * Must be called with gdev->session_mutex hold.
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+ * Return: 0 or negative errno value.
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+ * @gdev: The Guest extension device.
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+ * @session: The session.
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+ * @session_termination: Set if we're called by the session cleanup code.
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+ */
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+static int vbg_set_host_capabilities(struct vbg_dev *gdev,
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+ struct vbg_session *session,
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+ bool session_termination)
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+{
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+ struct vmmdev_mask *req;
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+ u32 caps;
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+ int rc;
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+
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+ WARN_ON(!mutex_is_locked(&gdev->session_mutex));
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+
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+ caps = gdev->set_guest_caps_tracker.mask;
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+
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+ if (gdev->guest_caps_host == caps)
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+ return 0;
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+
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+ /* On termination the requestor is the kernel, as we're cleaning up. */
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+ req = vbg_req_alloc(sizeof(*req), VMMDEVREQ_SET_GUEST_CAPABILITIES,
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+ session_termination ? VBG_KERNEL_REQUEST :
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+ session->requestor);
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+ if (!req) {
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+ gdev->guest_caps_host = U32_MAX;
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+ return -ENOMEM;
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+ }
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+
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+ req->or_mask = caps;
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+ req->not_mask = ~caps;
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+ rc = vbg_req_perform(gdev, req);
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+ vbg_req_free(req, sizeof(*req));
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+
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+ gdev->guest_caps_host = (rc >= 0) ? caps : U32_MAX;
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+
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+ return vbg_status_code_to_errno(rc);
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+}
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+
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/**
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* Sets the guest capabilities for a session. Takes the session spinlock.
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* Return: 0 or negative errno value.
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@@ -678,23 +720,8 @@ static int vbg_set_session_capabilities(struct vbg_dev *gdev,
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u32 or_mask, u32 not_mask,
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bool session_termination)
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{
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- struct vmmdev_mask *req;
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u32 changed, previous;
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- int rc, ret = 0;
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-
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- /*
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- * Allocate a request buffer before taking the spinlock, when
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- * the session is being terminated the requestor is the kernel,
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- * as we're cleaning up.
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- */
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- req = vbg_req_alloc(sizeof(*req), VMMDEVREQ_SET_GUEST_CAPABILITIES,
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- session_termination ? VBG_KERNEL_REQUEST :
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- session->requestor);
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- if (!req) {
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- if (!session_termination)
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- return -ENOMEM;
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- /* Ignore allocation failure, we must do session cleanup. */
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- }
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+ int ret = 0;
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mutex_lock(&gdev->session_mutex);
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@@ -709,23 +736,10 @@ static int vbg_set_session_capabilities(struct vbg_dev *gdev,
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goto out;
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vbg_track_bit_usage(&gdev->set_guest_caps_tracker, changed, previous);
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- or_mask = gdev->set_guest_caps_tracker.mask;
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-
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- if (gdev->guest_caps_host == or_mask || !req)
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- goto out;
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-
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- gdev->guest_caps_host = or_mask;
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- req->or_mask = or_mask;
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- req->not_mask = ~or_mask;
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- rc = vbg_req_perform(gdev, req);
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- if (rc < 0) {
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- ret = vbg_status_code_to_errno(rc);
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-
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- /* Failed, roll back (unless it's session termination time). */
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- gdev->guest_caps_host = U32_MAX;
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- if (session_termination)
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- goto out;
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+ ret = vbg_set_host_capabilities(gdev, session, session_termination);
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+ /* Roll back on failure, unless it's session termination time. */
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+ if (ret < 0 && !session_termination) {
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vbg_track_bit_usage(&gdev->set_guest_caps_tracker, changed,
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session->set_guest_caps);
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session->set_guest_caps = previous;
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@@ -733,7 +747,6 @@ static int vbg_set_session_capabilities(struct vbg_dev *gdev,
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out:
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mutex_unlock(&gdev->session_mutex);
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- vbg_req_free(req, sizeof(*req));
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return ret;
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}
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--
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2.26.2
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