Commit e6ec2fda authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'for-linus-5.0-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip 

Pull xen fixes from Juergen Gross:

 - Several fixes for the Xen pvcalls drivers (1 fix for the backend and
   8 for the frontend).

 - A fix for a rather longstanding bug in the Xen sched_clock()
   interface which led to weird time jumps when migrating the system.

 - A fix for avoiding accesses to x2apic MSRs in Xen PV guests.

* tag 'for-linus-5.0-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen: Fix x86 sched_clock() interface for xen
  pvcalls-front: fix potential null dereference
  always clear the X2APIC_ENABLE bit for PV guest
  pvcalls-front: Avoid get_free_pages(GFP_KERNEL) under spinlock
  xen/pvcalls: remove set but not used variable 'intf'
  pvcalls-back: set -ENOTCONN in pvcalls_conn_back_read
  pvcalls-front: don't return error when the ring is full
  pvcalls-front: properly allocate sk
  pvcalls-front: don't try to free unallocated rings
  pvcalls-front: read all data before closing the connection
parents dc6fef2c 867cefb4

arch/x86/xen/enlighten_pv.c

+1 −4
Original line number Diff line number Diff line
@@ -898,9 +898,6 @@ static u64 xen_read_msr_safe(unsigned int msr, int *err) 
	val = native_read_msr_safe(msr, err);

	switch (msr) {

	case MSR_IA32_APICBASE:

#ifdef CONFIG_X86_X2APIC

		if (!(cpuid_ecx(1) & (1 << (X86_FEATURE_X2APIC & 31))))

#endif

		val &= ~X2APIC_ENABLE;

		break;

	}

arch/x86/xen/time.c

+9 −3
Original line number Diff line number Diff line
@@ -361,8 +361,6 @@ void xen_timer_resume(void) 
{

	int cpu;



	pvclock_resume();



	if (xen_clockevent != &xen_vcpuop_clockevent)

		return;
@@ -379,12 +377,15 @@ static const struct pv_time_ops xen_time_ops __initconst = { 
};



static struct pvclock_vsyscall_time_info *xen_clock __read_mostly;

static u64 xen_clock_value_saved;



void xen_save_time_memory_area(void)

{

	struct vcpu_register_time_memory_area t;

	int ret;



	xen_clock_value_saved = xen_clocksource_read() - xen_sched_clock_offset;



	if (!xen_clock)

		return;
@@ -404,7 +405,7 @@ void xen_restore_time_memory_area(void) 
	int ret;



	if (!xen_clock)

		return;

		goto out;



	t.addr.v = &xen_clock->pvti;
@@ -421,6 +422,11 @@ void xen_restore_time_memory_area(void) 
	if (ret != 0)

		pr_notice("Cannot restore secondary vcpu_time_info (err %d)",

			  ret);



out:

	/* Need pvclock_resume() before using xen_clocksource_read(). */

	pvclock_resume();

	xen_sched_clock_offset = xen_clocksource_read() - xen_clock_value_saved;

}



static void xen_setup_vsyscall_time_info(void)

drivers/xen/events/events_base.c

+1 −1
Original line number Diff line number Diff line
@@ -1650,7 +1650,7 @@ void xen_callback_vector(void) 
			xen_have_vector_callback = 0;

			return;

		}

		pr_info("Xen HVM callback vector for event delivery is enabled\n");

		pr_info_once("Xen HVM callback vector for event delivery is enabled\n");

		alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR,

				xen_hvm_callback_vector);

	}

drivers/xen/pvcalls-back.c

+4 −5
Original line number Diff line number Diff line
@@ -160,9 +160,10 @@ static void pvcalls_conn_back_read(void *opaque) 


	/* write the data, then modify the indexes */

	virt_wmb();

	if (ret < 0)

	if (ret < 0) {

		atomic_set(&map->read, 0);

		intf->in_error = ret;

	else

	} else

		intf->in_prod = prod + ret;

	/* update the indexes, then notify the other end */

	virt_wmb();
@@ -282,13 +283,11 @@ static int pvcalls_back_socket(struct xenbus_device *dev, 
static void pvcalls_sk_state_change(struct sock *sock)

{

	struct sock_mapping *map = sock->sk_user_data;

	struct pvcalls_data_intf *intf;



	if (map == NULL)

		return;



	intf = map->ring;

	intf->in_error = -ENOTCONN;

	atomic_inc(&map->read);

	notify_remote_via_irq(map->irq);

}

drivers/xen/pvcalls-front.c

+75 −29
Original line number Diff line number Diff line
@@ -31,6 +31,12 @@ 
#define PVCALLS_NR_RSP_PER_RING __CONST_RING_SIZE(xen_pvcalls, XEN_PAGE_SIZE)

#define PVCALLS_FRONT_MAX_SPIN 5000



static struct proto pvcalls_proto = {

	.name	= "PVCalls",

	.owner	= THIS_MODULE,

	.obj_size = sizeof(struct sock),

};



struct pvcalls_bedata {

	struct xen_pvcalls_front_ring ring;

	grant_ref_t ref;
@@ -335,6 +341,42 @@ int pvcalls_front_socket(struct socket *sock) 
	return ret;

}



static void free_active_ring(struct sock_mapping *map)

{

	if (!map->active.ring)

		return;



	free_pages((unsigned long)map->active.data.in,

			map->active.ring->ring_order);

	free_page((unsigned long)map->active.ring);

}



static int alloc_active_ring(struct sock_mapping *map)

{

	void *bytes;



	map->active.ring = (struct pvcalls_data_intf *)

		get_zeroed_page(GFP_KERNEL);

	if (!map->active.ring)

		goto out;



	map->active.ring->ring_order = PVCALLS_RING_ORDER;

	bytes = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,

					PVCALLS_RING_ORDER);

	if (!bytes)

		goto out;



	map->active.data.in = bytes;

	map->active.data.out = bytes +

		XEN_FLEX_RING_SIZE(PVCALLS_RING_ORDER);



	return 0;



out:

	free_active_ring(map);

	return -ENOMEM;

}



static int create_active(struct sock_mapping *map, int *evtchn)

{

	void *bytes;
@@ -343,15 +385,7 @@ static int create_active(struct sock_mapping *map, int *evtchn) 
	*evtchn = -1;

	init_waitqueue_head(&map->active.inflight_conn_req);



	map->active.ring = (struct pvcalls_data_intf *)

		__get_free_page(GFP_KERNEL | __GFP_ZERO);

	if (map->active.ring == NULL)

		goto out_error;

	map->active.ring->ring_order = PVCALLS_RING_ORDER;

	bytes = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,

					PVCALLS_RING_ORDER);

	if (bytes == NULL)

		goto out_error;

	bytes = map->active.data.in;

	for (i = 0; i < (1 << PVCALLS_RING_ORDER); i++)

		map->active.ring->ref[i] = gnttab_grant_foreign_access(

			pvcalls_front_dev->otherend_id,
@@ -361,10 +395,6 @@ static int create_active(struct sock_mapping *map, int *evtchn) 
		pvcalls_front_dev->otherend_id,

		pfn_to_gfn(virt_to_pfn((void *)map->active.ring)), 0);



	map->active.data.in = bytes;

	map->active.data.out = bytes +

		XEN_FLEX_RING_SIZE(PVCALLS_RING_ORDER);



	ret = xenbus_alloc_evtchn(pvcalls_front_dev, evtchn);

	if (ret)

		goto out_error;
@@ -385,8 +415,6 @@ static int create_active(struct sock_mapping *map, int *evtchn) 
out_error:

	if (*evtchn >= 0)

		xenbus_free_evtchn(pvcalls_front_dev, *evtchn);

	free_pages((unsigned long)map->active.data.in, PVCALLS_RING_ORDER);

	free_page((unsigned long)map->active.ring);

	return ret;

}
@@ -406,17 +434,24 @@ int pvcalls_front_connect(struct socket *sock, struct sockaddr *addr, 
		return PTR_ERR(map);



	bedata = dev_get_drvdata(&pvcalls_front_dev->dev);

	ret = alloc_active_ring(map);

	if (ret < 0) {

		pvcalls_exit_sock(sock);

		return ret;

	}



	spin_lock(&bedata->socket_lock);

	ret = get_request(bedata, &req_id);

	if (ret < 0) {

		spin_unlock(&bedata->socket_lock);

		free_active_ring(map);

		pvcalls_exit_sock(sock);

		return ret;

	}

	ret = create_active(map, &evtchn);

	if (ret < 0) {

		spin_unlock(&bedata->socket_lock);

		free_active_ring(map);

		pvcalls_exit_sock(sock);

		return ret;

	}
@@ -469,8 +504,10 @@ static int __write_ring(struct pvcalls_data_intf *intf, 
	virt_mb();



	size = pvcalls_queued(prod, cons, array_size);

	if (size >= array_size)

	if (size > array_size)

		return -EINVAL;

	if (size == array_size)

		return 0;

	if (len > array_size - size)

		len = array_size - size;
@@ -560,15 +597,13 @@ static int __read_ring(struct pvcalls_data_intf *intf, 
	error = intf->in_error;

	/* get pointers before reading from the ring */

	virt_rmb();

	if (error < 0)

		return error;



	size = pvcalls_queued(prod, cons, array_size);

	masked_prod = pvcalls_mask(prod, array_size);

	masked_cons = pvcalls_mask(cons, array_size);



	if (size == 0)

		return 0;

		return error ?: size;



	if (len > size)

		len = size;
@@ -780,25 +815,36 @@ int pvcalls_front_accept(struct socket *sock, struct socket *newsock, int flags) 
		}

	}



	spin_lock(&bedata->socket_lock);

	ret = get_request(bedata, &req_id);

	map2 = kzalloc(sizeof(*map2), GFP_KERNEL);

	if (map2 == NULL) {

		clear_bit(PVCALLS_FLAG_ACCEPT_INFLIGHT,

			  (void *)&map->passive.flags);

		pvcalls_exit_sock(sock);

		return -ENOMEM;

	}

	ret = alloc_active_ring(map2);

	if (ret < 0) {

		clear_bit(PVCALLS_FLAG_ACCEPT_INFLIGHT,

				(void *)&map->passive.flags);

		spin_unlock(&bedata->socket_lock);

		kfree(map2);

		pvcalls_exit_sock(sock);

		return ret;

	}

	map2 = kzalloc(sizeof(*map2), GFP_ATOMIC);

	if (map2 == NULL) {

	spin_lock(&bedata->socket_lock);

	ret = get_request(bedata, &req_id);

	if (ret < 0) {

		clear_bit(PVCALLS_FLAG_ACCEPT_INFLIGHT,

			  (void *)&map->passive.flags);

		spin_unlock(&bedata->socket_lock);

		free_active_ring(map2);

		kfree(map2);

		pvcalls_exit_sock(sock);

		return -ENOMEM;

		return ret;

	}



	ret = create_active(map2, &evtchn);

	if (ret < 0) {

		free_active_ring(map2);

		kfree(map2);

		clear_bit(PVCALLS_FLAG_ACCEPT_INFLIGHT,

			  (void *)&map->passive.flags);
@@ -839,7 +885,7 @@ int pvcalls_front_accept(struct socket *sock, struct socket *newsock, int flags) 


received:

	map2->sock = newsock;

	newsock->sk = kzalloc(sizeof(*newsock->sk), GFP_KERNEL);

	newsock->sk = sk_alloc(sock_net(sock->sk), PF_INET, GFP_KERNEL, &pvcalls_proto, false);

	if (!newsock->sk) {

		bedata->rsp[req_id].req_id = PVCALLS_INVALID_ID;

		map->passive.inflight_req_id = PVCALLS_INVALID_ID;
@@ -1032,8 +1078,8 @@ int pvcalls_front_release(struct socket *sock) 
		spin_lock(&bedata->socket_lock);

		list_del(&map->list);

		spin_unlock(&bedata->socket_lock);

		if (READ_ONCE(map->passive.inflight_req_id) !=

		    PVCALLS_INVALID_ID) {

		if (READ_ONCE(map->passive.inflight_req_id) != PVCALLS_INVALID_ID &&

			READ_ONCE(map->passive.inflight_req_id) != 0) {

			pvcalls_front_free_map(bedata,

					       map->passive.accept_map);

		}

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