diff options
| -rw-r--r-- | arch/x86/xen/enlighten.c | 8 | ||||
| -rw-r--r-- | arch/x86/xen/p2m.c | 36 | ||||
| -rw-r--r-- | arch/x86/xen/setup.c | 3 | ||||
| -rw-r--r-- | drivers/tty/hvc/hvc_xen.c | 31 | ||||
| -rw-r--r-- | drivers/xen/events.c | 9 | ||||
| -rw-r--r-- | drivers/xen/pci.c | 2 |
6 files changed, 73 insertions, 16 deletions
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index e74df95..ff962d4 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -209,6 +209,9 @@ static void __init xen_banner(void) xen_feature(XENFEAT_mmu_pt_update_preserve_ad) ? " (preserve-AD)" : ""); } +#define CPUID_THERM_POWER_LEAF 6 +#define APERFMPERF_PRESENT 0 + static __read_mostly unsigned int cpuid_leaf1_edx_mask = ~0; static __read_mostly unsigned int cpuid_leaf1_ecx_mask = ~0; @@ -242,6 +245,11 @@ static void xen_cpuid(unsigned int *ax, unsigned int *bx, *dx = cpuid_leaf5_edx_val; return; + case CPUID_THERM_POWER_LEAF: + /* Disabling APERFMPERF for kernel usage */ + maskecx = ~(1 << APERFMPERF_PRESENT); + break; + case 0xb: /* Suppress extended topology stuff */ maskebx = 0; diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c index ffd08c4..64effdc6 100644 --- a/arch/x86/xen/p2m.c +++ b/arch/x86/xen/p2m.c @@ -706,6 +706,7 @@ int m2p_add_override(unsigned long mfn, struct page *page, unsigned long uninitialized_var(address); unsigned level; pte_t *ptep = NULL; + int ret = 0; pfn = page_to_pfn(page); if (!PageHighMem(page)) { @@ -741,6 +742,24 @@ int m2p_add_override(unsigned long mfn, struct page *page, list_add(&page->lru, &m2p_overrides[mfn_hash(mfn)]); spin_unlock_irqrestore(&m2p_override_lock, flags); + /* p2m(m2p(mfn)) == mfn: the mfn is already present somewhere in + * this domain. Set the FOREIGN_FRAME_BIT in the p2m for the other + * pfn so that the following mfn_to_pfn(mfn) calls will return the + * pfn from the m2p_override (the backend pfn) instead. + * We need to do this because the pages shared by the frontend + * (xen-blkfront) can be already locked (lock_page, called by + * do_read_cache_page); when the userspace backend tries to use them + * with direct_IO, mfn_to_pfn returns the pfn of the frontend, so + * do_blockdev_direct_IO is going to try to lock the same pages + * again resulting in a deadlock. + * As a side effect get_user_pages_fast might not be safe on the + * frontend pages while they are being shared with the backend, + * because mfn_to_pfn (that ends up being called by GUPF) will + * return the backend pfn rather than the frontend pfn. */ + ret = __get_user(pfn, &machine_to_phys_mapping[mfn]); + if (ret == 0 && get_phys_to_machine(pfn) == mfn) + set_phys_to_machine(pfn, FOREIGN_FRAME(mfn)); + return 0; } EXPORT_SYMBOL_GPL(m2p_add_override); @@ -752,6 +771,7 @@ int m2p_remove_override(struct page *page, bool clear_pte) unsigned long uninitialized_var(address); unsigned level; pte_t *ptep = NULL; + int ret = 0; pfn = page_to_pfn(page); mfn = get_phys_to_machine(pfn); @@ -821,6 +841,22 @@ int m2p_remove_override(struct page *page, bool clear_pte) } else set_phys_to_machine(pfn, page->index); + /* p2m(m2p(mfn)) == FOREIGN_FRAME(mfn): the mfn is already present + * somewhere in this domain, even before being added to the + * m2p_override (see comment above in m2p_add_override). + * If there are no other entries in the m2p_override corresponding + * to this mfn, then remove the FOREIGN_FRAME_BIT from the p2m for + * the original pfn (the one shared by the frontend): the backend + * cannot do any IO on this page anymore because it has been + * unshared. Removing the FOREIGN_FRAME_BIT from the p2m entry of + * the original pfn causes mfn_to_pfn(mfn) to return the frontend + * pfn again. */ + mfn &= ~FOREIGN_FRAME_BIT; + ret = __get_user(pfn, &machine_to_phys_mapping[mfn]); + if (ret == 0 && get_phys_to_machine(pfn) == FOREIGN_FRAME(mfn) && + m2p_find_override(mfn) == NULL) + set_phys_to_machine(pfn, mfn); + return 0; } EXPORT_SYMBOL_GPL(m2p_remove_override); diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c index 3ebba07..a4790bf 100644 --- a/arch/x86/xen/setup.c +++ b/arch/x86/xen/setup.c @@ -371,7 +371,8 @@ char * __init xen_memory_setup(void) populated = xen_populate_chunk(map, memmap.nr_entries, max_pfn, &last_pfn, xen_released_pages); - extra_pages += (xen_released_pages - populated); + xen_released_pages -= populated; + extra_pages += xen_released_pages; if (last_pfn > max_pfn) { max_pfn = min(MAX_DOMAIN_PAGES, last_pfn); diff --git a/drivers/tty/hvc/hvc_xen.c b/drivers/tty/hvc/hvc_xen.c index d3d91da..944eaeb 100644 --- a/drivers/tty/hvc/hvc_xen.c +++ b/drivers/tty/hvc/hvc_xen.c @@ -214,24 +214,24 @@ static int xen_hvm_console_init(void) /* already configured */ if (info->intf != NULL) return 0; - + /* + * If the toolstack (or the hypervisor) hasn't set these values, the + * default value is 0. Even though mfn = 0 and evtchn = 0 are + * theoretically correct values, in practice they never are and they + * mean that a legacy toolstack hasn't initialized the pv console correctly. + */ r = hvm_get_parameter(HVM_PARAM_CONSOLE_EVTCHN, &v); - if (r < 0) { - kfree(info); - return -ENODEV; - } + if (r < 0 || v == 0) + goto err; info->evtchn = v; - hvm_get_parameter(HVM_PARAM_CONSOLE_PFN, &v); - if (r < 0) { - kfree(info); - return -ENODEV; - } + v = 0; + r = hvm_get_parameter(HVM_PARAM_CONSOLE_PFN, &v); + if (r < 0 || v == 0) + goto err; mfn = v; info->intf = ioremap(mfn << PAGE_SHIFT, PAGE_SIZE); - if (info->intf == NULL) { - kfree(info); - return -ENODEV; - } + if (info->intf == NULL) + goto err; info->vtermno = HVC_COOKIE; spin_lock(&xencons_lock); @@ -239,6 +239,9 @@ static int xen_hvm_console_init(void) spin_unlock(&xencons_lock); return 0; +err: + kfree(info); + return -ENODEV; } static int xen_pv_console_init(void) diff --git a/drivers/xen/events.c b/drivers/xen/events.c index 6908e4c..7595581 100644 --- a/drivers/xen/events.c +++ b/drivers/xen/events.c @@ -827,6 +827,9 @@ int bind_evtchn_to_irq(unsigned int evtchn) handle_edge_irq, "event"); xen_irq_info_evtchn_init(irq, evtchn); + } else { + struct irq_info *info = info_for_irq(irq); + WARN_ON(info == NULL || info->type != IRQT_EVTCHN); } out: @@ -862,6 +865,9 @@ static int bind_ipi_to_irq(unsigned int ipi, unsigned int cpu) xen_irq_info_ipi_init(cpu, irq, evtchn, ipi); bind_evtchn_to_cpu(evtchn, cpu); + } else { + struct irq_info *info = info_for_irq(irq); + WARN_ON(info == NULL || info->type != IRQT_IPI); } out: @@ -939,6 +945,9 @@ int bind_virq_to_irq(unsigned int virq, unsigned int cpu) xen_irq_info_virq_init(cpu, irq, evtchn, virq); bind_evtchn_to_cpu(evtchn, cpu); + } else { + struct irq_info *info = info_for_irq(irq); + WARN_ON(info == NULL || info->type != IRQT_VIRQ); } out: diff --git a/drivers/xen/pci.c b/drivers/xen/pci.c index b84bf0b..18fff88 100644 --- a/drivers/xen/pci.c +++ b/drivers/xen/pci.c @@ -59,7 +59,7 @@ static int xen_add_device(struct device *dev) #ifdef CONFIG_ACPI handle = DEVICE_ACPI_HANDLE(&pci_dev->dev); - if (!handle) + if (!handle && pci_dev->bus->bridge) handle = DEVICE_ACPI_HANDLE(pci_dev->bus->bridge); #ifdef CONFIG_PCI_IOV if (!handle && pci_dev->is_virtfn) |
