kernel 5.7.8

1 files changed, 130 insertions, 0 deletions

diff --git a/SOURCES/0001-virt-vbox-Add-vbg_set_host_capabilities-helper-funct.patch b/SOURCES/0001-virt-vbox-Add-vbg_set_host_capabilities-helper-funct.patch
new file mode 100644
index 0000000..3362ead
--- /dev/null
+++ b/SOURCES/0001-virt-vbox-Add-vbg_set_host_capabilities-helper-funct.patch
@@ -0,0 +1,130 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Hans de Goede <hdegoede@redhat.com>
+Date: Tue, 19 May 2020 15:30:29 +0200
+Subject: [PATCH] virt: vbox: Add vbg_set_host_capabilities() helper function
+
+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>
+Upstream Status: https://lore.kernel.org/lkml/20200520195440.38759-1-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
+