xen: bug fixes for 4.2-rc6
- Revert a fix from 4.2-rc5 that was causing lots of WARNING spam. - Fix a memory leak affecting backends in HVM guests. - Fix PV domU hang with certain configurations. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQEcBAABAgAGBQJVzHsAAAoJEFxbo/MsZsTR9Y0H/2j1PHt29RPcNdgGQ84AH0Wh tw1emL8rMcdhWQnsO7bNmywNNvRNQnU3ZJ8dzoq+5GPikNsbfQzYc7U2pIL4A+gB AAJsNDNzecuq4srk8vNxcmZ7ySvm9w6dccDUex2ge3sNWaq6gzSQvz6FSWiL0Sxg k3JcnemEg6JrYOTWdxKInAORMcRO6rgx9eIsdPUPOpgC5XLg6/mZOqBAWXIksDvs V9uCMqQicaUgBgKFIOSllqH6fcCNooRu3aDwNNj/2mMcJmEvMeBkHmNlQgEm2j5L ubdDyrC5y48TUPJm8i3+W2/AY+kgWzhThcqyVy6LRAAj5RItJFxMf0nMXzIEqlQ= =UgMy -----END PGP SIGNATURE----- Merge tag 'for-linus-4.2-rc6-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip Pull xen bug fixes from David Vrabel: - revert a fix from 4.2-rc5 that was causing lots of WARNING spam. - fix a memory leak affecting backends in HVM guests. - fix PV domU hang with certain configurations. * tag 'for-linus-4.2-rc6-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip: xen/xenbus: Don't leak memory when unmapping the ring on HVM backend Revert "xen/events/fifo: Handle linked events when closing a port" x86/xen: build "Xen PV" APIC driver for domU as well
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commit
6b476e1140
@ -13,13 +13,13 @@ CFLAGS_mmu.o := $(nostackp)
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obj-y := enlighten.o setup.o multicalls.o mmu.o irq.o \
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time.o xen-asm.o xen-asm_$(BITS).o \
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grant-table.o suspend.o platform-pci-unplug.o \
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p2m.o
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p2m.o apic.o
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obj-$(CONFIG_EVENT_TRACING) += trace.o
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obj-$(CONFIG_SMP) += smp.o
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obj-$(CONFIG_PARAVIRT_SPINLOCKS)+= spinlock.o
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obj-$(CONFIG_XEN_DEBUG_FS) += debugfs.o
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obj-$(CONFIG_XEN_DOM0) += apic.o vga.o
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obj-$(CONFIG_XEN_DOM0) += vga.o
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obj-$(CONFIG_SWIOTLB_XEN) += pci-swiotlb-xen.o
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obj-$(CONFIG_XEN_EFI) += efi.o
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@ -101,17 +101,15 @@ struct dom0_vga_console_info;
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#ifdef CONFIG_XEN_DOM0
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void __init xen_init_vga(const struct dom0_vga_console_info *, size_t size);
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void __init xen_init_apic(void);
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#else
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static inline void __init xen_init_vga(const struct dom0_vga_console_info *info,
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size_t size)
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{
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}
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static inline void __init xen_init_apic(void)
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{
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}
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#endif
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void __init xen_init_apic(void);
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#ifdef CONFIG_XEN_EFI
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extern void xen_efi_init(void);
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#else
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@ -452,12 +452,10 @@ static void xen_free_irq(unsigned irq)
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irq_free_desc(irq);
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}
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static void xen_evtchn_close(unsigned int port, unsigned int cpu)
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static void xen_evtchn_close(unsigned int port)
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{
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struct evtchn_close close;
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xen_evtchn_op_close(port, cpu);
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close.port = port;
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if (HYPERVISOR_event_channel_op(EVTCHNOP_close, &close) != 0)
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BUG();
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@ -546,7 +544,7 @@ out:
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err:
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pr_err("irq%d: Failed to set port to irq mapping (%d)\n", irq, rc);
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xen_evtchn_close(evtchn, NR_CPUS);
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xen_evtchn_close(evtchn);
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return 0;
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}
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@ -567,7 +565,7 @@ static void shutdown_pirq(struct irq_data *data)
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return;
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mask_evtchn(evtchn);
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xen_evtchn_close(evtchn, cpu_from_evtchn(evtchn));
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xen_evtchn_close(evtchn);
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xen_irq_info_cleanup(info);
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}
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@ -611,7 +609,7 @@ static void __unbind_from_irq(unsigned int irq)
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if (VALID_EVTCHN(evtchn)) {
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unsigned int cpu = cpu_from_irq(irq);
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xen_evtchn_close(evtchn, cpu);
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xen_evtchn_close(evtchn);
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switch (type_from_irq(irq)) {
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case IRQT_VIRQ:
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@ -255,12 +255,6 @@ static void evtchn_fifo_unmask(unsigned port)
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}
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}
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static bool evtchn_fifo_is_linked(unsigned port)
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{
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event_word_t *word = event_word_from_port(port);
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return sync_test_bit(EVTCHN_FIFO_BIT(LINKED, word), BM(word));
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}
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static uint32_t clear_linked(volatile event_word_t *word)
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{
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event_word_t new, old, w;
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@ -287,8 +281,7 @@ static void handle_irq_for_port(unsigned port)
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static void consume_one_event(unsigned cpu,
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struct evtchn_fifo_control_block *control_block,
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unsigned priority, unsigned long *ready,
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bool drop)
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unsigned priority, unsigned long *ready)
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{
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struct evtchn_fifo_queue *q = &per_cpu(cpu_queue, cpu);
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uint32_t head;
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@ -320,15 +313,13 @@ static void consume_one_event(unsigned cpu,
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if (head == 0)
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clear_bit(priority, ready);
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if (evtchn_fifo_is_pending(port) && !evtchn_fifo_is_masked(port)) {
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if (likely(!drop))
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handle_irq_for_port(port);
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}
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if (evtchn_fifo_is_pending(port) && !evtchn_fifo_is_masked(port))
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handle_irq_for_port(port);
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q->head[priority] = head;
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}
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static void __evtchn_fifo_handle_events(unsigned cpu, bool drop)
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static void evtchn_fifo_handle_events(unsigned cpu)
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{
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struct evtchn_fifo_control_block *control_block;
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unsigned long ready;
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@ -340,16 +331,11 @@ static void __evtchn_fifo_handle_events(unsigned cpu, bool drop)
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while (ready) {
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q = find_first_bit(&ready, EVTCHN_FIFO_MAX_QUEUES);
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consume_one_event(cpu, control_block, q, &ready, drop);
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consume_one_event(cpu, control_block, q, &ready);
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ready |= xchg(&control_block->ready, 0);
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}
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}
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static void evtchn_fifo_handle_events(unsigned cpu)
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{
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__evtchn_fifo_handle_events(cpu, false);
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}
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static void evtchn_fifo_resume(void)
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{
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unsigned cpu;
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@ -385,26 +371,6 @@ static void evtchn_fifo_resume(void)
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event_array_pages = 0;
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}
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static void evtchn_fifo_close(unsigned port, unsigned int cpu)
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{
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if (cpu == NR_CPUS)
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return;
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get_online_cpus();
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if (cpu_online(cpu)) {
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if (WARN_ON(irqs_disabled()))
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goto out;
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while (evtchn_fifo_is_linked(port))
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cpu_relax();
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} else {
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__evtchn_fifo_handle_events(cpu, true);
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}
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out:
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put_online_cpus();
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}
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static const struct evtchn_ops evtchn_ops_fifo = {
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.max_channels = evtchn_fifo_max_channels,
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.nr_channels = evtchn_fifo_nr_channels,
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@ -418,7 +384,6 @@ static const struct evtchn_ops evtchn_ops_fifo = {
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.unmask = evtchn_fifo_unmask,
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.handle_events = evtchn_fifo_handle_events,
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.resume = evtchn_fifo_resume,
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.close = evtchn_fifo_close,
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};
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static int evtchn_fifo_alloc_control_block(unsigned cpu)
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@ -68,7 +68,6 @@ struct evtchn_ops {
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bool (*test_and_set_mask)(unsigned port);
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void (*mask)(unsigned port);
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void (*unmask)(unsigned port);
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void (*close)(unsigned port, unsigned cpu);
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void (*handle_events)(unsigned cpu);
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void (*resume)(void);
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@ -146,12 +145,6 @@ static inline void xen_evtchn_resume(void)
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evtchn_ops->resume();
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}
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static inline void xen_evtchn_op_close(unsigned port, unsigned cpu)
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{
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if (evtchn_ops->close)
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return evtchn_ops->close(port, cpu);
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}
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void xen_evtchn_2l_init(void);
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int xen_evtchn_fifo_init(void);
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@ -814,8 +814,10 @@ static int xenbus_unmap_ring_vfree_hvm(struct xenbus_device *dev, void *vaddr)
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rv = xenbus_unmap_ring(dev, node->handles, node->nr_handles,
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addrs);
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if (!rv)
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if (!rv) {
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vunmap(vaddr);
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free_xenballooned_pages(node->nr_handles, node->hvm.pages);
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}
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else
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WARN(1, "Leaking %p, size %u page(s)\n", vaddr,
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node->nr_handles);
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