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2011-01-12Merge branch 'stable/xenbus' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xenLinus Torvalds1-1/+1
* 'stable/xenbus' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen: xen/xenbus: making backend support modular is too complex xen/pci: Make xen-pcifront be dependent on XEN_XENBUS_FRONTEND xen/xenbus: fixup checkpatch issues in xenbus_probe* xen/netfront: select XEN_XENBUS_FRONTEND xen/xenbus: clean up noise in xenbus_probe_frontend.c xen/xenbus: clean up noise in xenbus_probe_backend.c xen/xenbus: clean up noise in xenbus_probe.c xen/xenbus: cleanup debug noise in xenbus_comms.c xen/xenbus: clean up error handling xen/xenbus: make frontend bus GPL xen/xenbus: make sure backend bus is registered earlier xenbus/frontend: register bus earlier xen: remove xen/evtchn.h xen: add backend driver support xen: separate out frontend xenbus
2011-01-05xen: add backend driver supportIan Campbell1-1/+1
Impact: backend device support Add the basic machinery to support backend drivers. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> [corresponds to 79727b851bac in git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen.git] Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2010-12-15xen: Provide a variant of __RING_SIZE() that is an integer constant expressionJeremy Fitzhardinge1-2/+9
Without this, gcc 4.5 won't compile xen-netfront and xen-blkfront, where this is being used to specify array sizes. Signed-off-by: Jan Beulich <jbeulich@novell.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: David Miller <davem@davemloft.net> Cc: Stable Kernel <stable@kernel.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-12-02xen: fix MSI setup and teardown for PV on HVM guestsStefano Stabellini1-1/+6
When remapping MSIs into pirqs for PV on HVM guests, qemu is responsible for doing the actual mapping and unmapping. We only give qemu the desired pirq number when we ask to do the mapping the first time, after that we should be reading back the pirq number from qemu every time we want to re-enable the MSI. This fixes a bug in xen_hvm_setup_msi_irqs that manifests itself when trying to enable the same MSI for the second time: the old MSI to pirq mapping is still valid at this point but xen_hvm_setup_msi_irqs would try to assign a new pirq anyway. A simple way to reproduce this bug is to assign an MSI capable network card to a PV on HVM guest, if the user brings down the corresponding ethernet interface and up again, Linux would fail to enable MSIs on the device. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
2010-12-02xen: use PHYSDEVOP_get_free_pirq to implement find_unbound_pirqStefano Stabellini1-0/+10
Use the new hypercall PHYSDEVOP_get_free_pirq to ask Xen to allocate a pirq. Remove the unsupported PHYSDEVOP_get_nr_pirqs hypercall to get the amount of pirq available. This fixes find_unbound_pirq that otherwise would return a number starting from nr_irqs that might very well be out of range in Xen. The symptom of this bug is that when you passthrough an MSI capable pci device to a PV on HVM guest, Linux would fail to enable MSIs on the device. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
2010-11-22Merge branches 'upstream/core', 'upstream/xenfs' and 'upstream/evtchn' into upstream/for-linusJeremy Fitzhardinge1-4/+1
* upstream/core: xen/events: Use PIRQ instead of GSI value when unmapping MSI/MSI-X irqs. xen: set IO permission early (before early_cpu_init()) xen: re-enable boot-time ballooning xen/balloon: make sure we only include remaining extra ram xen/balloon: the balloon_lock is useless xen: add extra pages to balloon xen/events: use locked set|clear_bit() for cpu_evtchn_mask xen/evtchn: clear secondary CPUs' cpu_evtchn_mask[] after restore xen: implement XENMEM_machphys_mapping * upstream/xenfs: Revert "xen/privcmd: create address space to allow writable mmaps" xen/xenfs: update xenfs_mount for new prototype xen: fix header export to userspace xen: set vma flag VM_PFNMAP in the privcmd mmap file_op xen: xenfs: privcmd: check put_user() return code * upstream/evtchn: xen: make evtchn's name less generic xen/evtchn: the evtchn device is non-seekable xen/evtchn: add missing static xen/evtchn: Fix name of Xen event-channel device xen/evtchn: don't do unbind_from_irqhandler under spinlock xen/evtchn: remove spurious barrier xen/evtchn: ports start enabled xen/evtchn: dynamically allocate port_user array xen/evtchn: track enabled state for each port
2010-11-19xen: add extra pages to balloonJeremy Fitzhardinge1-0/+7
Add extra pages in the pseudo-physical address space to the balloon so we can extend into them later. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
2010-11-16Merge commit 'v2.6.37-rc2' into upstream/xenfsJeremy Fitzhardinge6-1/+244
* commit 'v2.6.37-rc2': (10093 commits) Linux 2.6.37-rc2 capabilities/syslog: open code cap_syslog logic to fix build failure i2c: Sanity checks on adapter registration i2c: Mark i2c_adapter.id as deprecated i2c: Drivers shouldn't include <linux/i2c-id.h> i2c: Delete unused adapter IDs i2c: Remove obsolete cleanup for clientdata include/linux/kernel.h: Move logging bits to include/linux/printk.h Fix gcc 4.5.1 miscompiling drivers/char/i8k.c (again) hwmon: (w83795) Check for BEEP pin availability hwmon: (w83795) Clear intrusion alarm immediately hwmon: (w83795) Read the intrusion state properly hwmon: (w83795) Print the actual temperature channels as sources hwmon: (w83795) List all usable temperature sources hwmon: (w83795) Expose fan control method hwmon: (w83795) Fix fan control mode attributes hwmon: (lm95241) Check validity of input values hwmon: Change mail address of Hans J. Koch PCI: sysfs: fix printk warnings GFS2: Fix inode deallocation race ...
2010-11-16xen: fix header export to userspaceRandy Dunlap1-4/+1
scripts/headers_install.pl prevents "__user" from being exported to userspace headers, so just use compiler.h to make sure that __user is defined and avoid the error. unifdef: linux-next-20101112/xx64/usr/include/xen/privcmd.h.tmp: 79: Premature EOF (#if line 33 depth 1) Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Cc: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: xen-devel@lists.xensource.com (moderated for non-subscribers) Cc: virtualization@lists.osdl.org Cc: Tony Finch <dot@dotat.at> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
2010-11-12xen: implement XENMEM_machphys_mappingIan Campbell1-0/+13
This hypercall allows Xen to specify a non-default location for the machine to physical mapping. This capability is used when running a 32 bit domain 0 on a 64 bit hypervisor to shrink the hypervisor hole to exactly the size required. [ Impact: add Xen hypercall definitions ] Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
2010-10-28Merge branch 'stable/xen-pcifront-0.8.2' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xenLinus Torvalds5-1/+215
and branch 'for-linus' of git://xenbits.xen.org/people/sstabellini/linux-pvhvm * 'for-linus' of git://xenbits.xen.org/people/sstabellini/linux-pvhvm: xen: register xen pci notifier xen: initialize cpu masks for pv guests in xen_smp_init xen: add a missing #include to arch/x86/pci/xen.c xen: mask the MTRR feature from the cpuid xen: make hvc_xen console work for dom0. xen: add the direct mapping area for ISA bus access xen: Initialize xenbus for dom0. xen: use vcpu_ops to setup cpu masks xen: map a dummy page for local apic and ioapic in xen_set_fixmap xen: remap MSIs into pirqs when running as initial domain xen: remap GSIs as pirqs when running as initial domain xen: introduce XEN_DOM0 as a silent option xen: map MSIs into pirqs xen: support GSI -> pirq remapping in PV on HVM guests xen: add xen hvm acpi_register_gsi variant acpi: use indirect call to register gsi in different modes xen: implement xen_hvm_register_pirq xen: get the maximum number of pirqs from xen xen: support pirq != irq * 'stable/xen-pcifront-0.8.2' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen: (27 commits) X86/PCI: Remove the dependency on isapnp_disable. xen: Update Makefile with CONFIG_BLOCK dependency for biomerge.c MAINTAINERS: Add myself to the Xen Hypervisor Interface and remove Chris Wright. x86: xen: Sanitse irq handling (part two) swiotlb-xen: On x86-32 builts, select SWIOTLB instead of depending on it. MAINTAINERS: Add myself for Xen PCI and Xen SWIOTLB maintainer. xen/pci: Request ACS when Xen-SWIOTLB is activated. xen-pcifront: Xen PCI frontend driver. xenbus: prevent warnings on unhandled enumeration values xenbus: Xen paravirtualised PCI hotplug support. xen/x86/PCI: Add support for the Xen PCI subsystem x86: Introduce x86_msi_ops msi: Introduce default_[teardown|setup]_msi_irqs with fallback. x86/PCI: Export pci_walk_bus function. x86/PCI: make sure _PAGE_IOMAP it set on pci mappings x86/PCI: Clean up pci_cache_line_size xen: fix shared irq device passthrough xen: Provide a variant of xen_poll_irq with timeout. xen: Find an unbound irq number in reverse order (high to low). xen: statically initialize cpu_evtchn_mask_p ... Fix up trivial conflicts in drivers/pci/Makefile
2010-10-27xen: register xen pci notifierWeidong Han1-0/+21
Register a pci notifier to add (or remove) pci devices to Xen via hypercalls. Xen needs to know the pci devices present in the system to handle pci passthrough and even MSI remapping in the initial domain. Signed-off-by: Weidong Han <weidong.han@intel.com> Signed-off-by: Qing He <qing.he@intel.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
2010-10-26Merge branches 'upstream/xenfs' and 'upstream/core' of git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xenLinus Torvalds4-0/+115
* 'upstream/xenfs' of git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen: xen/privcmd: make privcmd visible in domU xen/privcmd: move remap_domain_mfn_range() to core xen code and export. privcmd: MMAPBATCH: Fix error handling/reporting xenbus: export xen_store_interface for xenfs xen/privcmd: make sure vma is ours before doing anything to it xen/privcmd: print SIGBUS faults xen/xenfs: set_page_dirty is supposed to return true if it dirties xen/privcmd: create address space to allow writable mmaps xen: add privcmd driver xen: add variable hypercall caller xen: add xen_set_domain_pte() xen: add /proc/xen/xsd_{kva,port} to xenfs * 'upstream/core' of git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen: (29 commits) xen: include xen/xen.h for definition of xen_initial_domain() xen: use host E820 map for dom0 xen: correctly rebuild mfn list list after migration. xen: improvements to VIRQ_DEBUG output xen: set up IRQ before binding virq to evtchn xen: ensure that all event channels start off bound to VCPU 0 xen/hvc: only notify if we actually sent something xen: don't add extra_pages for RAM after mem_end xen: add support for PAT xen: make sure xen_max_p2m_pfn is up to date xen: limit extra memory to a certain ratio of base xen: add extra pages for E820 RAM regions, even if beyond mem_end xen: make sure xen_extra_mem_start is beyond all non-RAM e820 xen: implement "extra" memory to reserve space for pages not present at boot xen: Use host-provided E820 map xen: don't map missing memory xen: defer building p2m mfn structures until kernel is mapped xen: add return value to set_phys_to_machine() xen: convert p2m to a 3 level tree xen: make install_p2mtop_page() static ... Fix up trivial conflict in arch/x86/xen/mmu.c, and fix the use of 'reserve_early()' - in the new memblock world order it is now 'memblock_x86_reserve_range()' instead. Pointed out by Jeremy.
2010-10-22xen: make hvc_xen console work for dom0.Jeremy Fitzhardinge1-0/+1
Use the console hypercalls for dom0 console. [ Impact: Add Xen dom0 console ] Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2010-10-22xen: remap MSIs into pirqs when running as initial domainQing He1-0/+4
Implement xen_create_msi_irq to create an msi and remap it as pirq. Use xen_create_msi_irq to implement an initial domain specific version of setup_msi_irqs. Signed-off-by: Qing He <qing.he@intel.com> Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2010-10-22xen: remap GSIs as pirqs when running as initial domainJeremy Fitzhardinge1-0/+10
Implement xen_register_gsi to setup the correct triggering and polarity properties of a gsi. Implement xen_register_pirq to register a particular gsi as pirq and receive interrupts as events. Call xen_setup_pirqs to register all the legacy ISA irqs as pirqs. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2010-10-22xen: map MSIs into pirqsStefano Stabellini1-0/+2
Map MSIs into pirqs, writing 0 in the MSI vector data field and the pirq number in the MSI destination id field. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2010-10-22xen: support GSI -> pirq remapping in PV on HVM guestsStefano Stabellini1-0/+3
Disable pcifront when running on HVM: it is meant to be used with pv guests that don't have PCI bus. Use acpi_register_gsi_xen_hvm to remap GSIs into pirqs. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2010-10-22xen: implement xen_hvm_register_pirqStefano Stabellini1-0/+30
xen_hvm_register_pirq allows the kernel to map a GSI into a Xen pirq and receive the interrupt as an event channel from that point on. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2010-10-22xen: get the maximum number of pirqs from xenStefano Stabellini1-0/+6
Use PHYSDEVOP_get_nr_pirqs to get the maximum number of pirqs from xen. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2010-10-22xen: support pirq != irqStefano Stabellini1-0/+1
PHYSDEVOP_map_pirq might return a pirq different from what we asked if we are running as an HVM guest, so we need to be able to support pirqs that are different from linux irqs. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2010-10-22xen: Use host-provided E820 mapIan Campbell1-0/+29
Rather than simply using a flat memory map from Xen, use its provided E820 map. This allows the domain builder to tell the domain to reserve space for more pages than those initially provided at domain-build time. It also allows the host to specify holes in the address space (for PCI-passthrough, for example). Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
2010-10-20xen/privcmd: move remap_domain_mfn_range() to core xen code and export.Ian Campbell1-0/+5
This allows xenfs to be built as a module, previously it required flush_tlb_all and arbitrary_virt_to_machine to be exported. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
2010-10-20xen: add privcmd driverJeremy Fitzhardinge2-0/+81
The privcmd interface in xenfs allows the tool stack in the privileged domain to get fairly direct access to the hypervisor in order to do various management things such as domain construction. [ Impact: new xenfs interface for privileged operations ] Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
2010-10-18xen-pcifront: Xen PCI frontend driver.Ryan Wilson1-0/+112
This is a port of the 2.6.18 Xen PCI front driver with fixes to make it build under 2.6.34 and later (for the full list of changes: git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git historic/xen-pcifront-0.1). It also includes the fixes to make it work properly. [v2: Updated Kconfig, removed crud, added Reviewed-by] [v3: Added 'static', fixed grant table leak, redid Kconfig] [v4: Added one more 'static' and removed comments] Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Reviewed-by: Jan Beulich <JBeulich@novell.com>
2010-10-18xenbus: Xen paravirtualised PCI hotplug support.Yosuke Iwamatsu1-1/+7
The Xen PCI front driver adds two new states that are utilizez for PCI hotplug support. This is a patch pulled from the linux-2.6-xen-sparse tree. Signed-off-by: Noboru Iwamatsu <n_iwamatsu@jp.fujitsu.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Yosuke Iwamatsu <y-iwamatsu@ab.jp.nec.com>
2010-10-18xen/x86/PCI: Add support for the Xen PCI subsystemAlex Nixon1-0/+3
The frontend stub lives in arch/x86/pci/xen.c, alongside other sub-arch PCI init code (e.g. olpc.c). It provides a mechanism for Xen PCI frontend to setup/destroy legacy interrupts, MSI/MSI-X, and PCI configuration operations. [ Impact: add core of Xen PCI support ] [ v2: Removed the IOMMU code and only focusing on PCI.] [ v3: removed usage of pci_scan_all_fns as that does not exist] [ v4: introduced pci_xen value to fix compile warnings] [ v5: squished fixes+features in one patch, changed Reviewed-by to Ccs] [ v7: added Acked-by] Signed-off-by: Alex Nixon <alex.nixon@citrix.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Matthew Wilcox <willy@linux.intel.com> Cc: Qing He <qing.he@intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: x86@kernel.org
2010-10-18xen: fix shared irq device passthroughKonrad Rzeszutek Wilk1-1/+1
In driver/xen/events.c, whether bind_pirq is shareable or not is determined by desc->action is NULL or not. But in __setup_irq, startup(irq) is invoked before desc->action is assigned with new action. So desc->action in startup_irq is always NULL, and bind_pirq is always not shareable. This results in pt_irq_create_bind failure when passthrough a device which shares irq to other devices. This patch doesn't use probing_irq to determine if pirq is shareable or not, instead set shareable flag in irq_info according to trigger mode in xen_allocate_pirq. Set level triggered interrupts shareable. Thus use this flag to set bind_pirq flag accordingly. [v2: arch/x86/xen/pci.c no more, so file skipped] Signed-off-by: Weidong Han <weidong.han@intel.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2010-10-18xen: Provide a variant of xen_poll_irq with timeout.Konrad Rzeszutek Wilk1-0/+4
The 'xen_poll_irq_timeout' provides a method to pass in the poll timeout for IRQs if requested. We also export those two poll functions as Xen PCI fronted uses them. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
2010-10-18xen: set pirq name to something useful.Gerd Hoffmann1-1/+1
Impact: cleanup Make pirq show useful information in /proc/interrupts [v2: Removed the parts for arch/x86/xen/pci.c ] Signed-off-by: Gerd Hoffmann <kraxel@xeni.home.kraxel.org> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2010-10-18xen: implement pirq type event channelsJeremy Fitzhardinge1-0/+11
A privileged PV Xen domain can get direct access to hardware. In order for this to be useful, it must be able to get hardware interrupts. Being a PV Xen domain, all interrupts are delivered as event channels. PIRQ event channels are bound to a pirq number and an interrupt vector. When a IO APIC raises a hardware interrupt on that vector, it is delivered as an event channel, which we can deliver to the appropriate device driver(s). This patch simply implements the infrastructure for dealing with pirq event channels. [ Impact: integrate hardware interrupts into Xen's event scheme ] Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2010-08-23xen: pvhvm: make it clearer that XEN_UNPLUG_* define bits in a bitfieldIan Campbell1-6/+9
by defining in terms of (1<<N). XEN_UNPLUG_UNNECESSARY and XEN_UNPLUG_NEVER are only used within the kernel and are not defined as a bit on the unplug IO port. Therefore use a bit which is outside the potentially valid range of the 16 bit IO port. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Acked-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Acked-by: Stefano Stabellini <Stefano.Stabellini@eu.citrix.com>
2010-08-23xen: pvhvm: rename xen_emul_unplug=ignore to =unnnecessaryIan Campbell1-1/+1
It is not immediately clear what this option causes to become ignored. The actual meaning is that it is not necessary to unplug the emulated devices to safely use the PV ones, even if the platform does not support the unplug protocol. (pressumably the user will only add this option if they have ensured that their domain configuration is safe). I think xen_emul_unplug=unnecessary better captures this. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Acked-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Acked-by: Stefano Stabellini <Stefano.Stabellini@eu.citrix.com>
2010-08-23xen: pvhvm: allow user to request no emulated device unplugIan Campbell1-0/+1
this allows the user to disable pvhvm and revert to emulated devices in case of a system misconfiguration (e.g. initramfs with only emulated drivers in it). Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Acked-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Acked-by: Stefano Stabellini <Stefano.Stabellini@eu.citrix.com>
2010-08-12Merge branch 'stable/xen-swiotlb-0.8.6' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xenLinus Torvalds3-0/+121
* 'stable/xen-swiotlb-0.8.6' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen: x86: Detect whether we should use Xen SWIOTLB. pci-swiotlb-xen: Add glue code to setup dma_ops utilizing xen_swiotlb_* functions. swiotlb-xen: SWIOTLB library for Xen PV guest with PCI passthrough. xen/mmu: inhibit vmap aliases rather than trying to clear them out vmap: add flag to allow lazy unmap to be disabled at runtime xen: Add xen_create_contiguous_region xen: Rename the balloon lock xen: Allow unprivileged Xen domains to create iomap pages xen: use _PAGE_IOMAP in ioremap to do machine mappings Fix up trivial conflicts (adding both xen swiotlb and xen pci platform driver setup close to each other) in drivers/xen/{Kconfig,Makefile} and include/xen/xen-ops.h
2010-07-27swiotlb-xen: SWIOTLB library for Xen PV guest with PCI passthrough.Konrad Rzeszutek Wilk1-0/+65
This patchset: PV guests under Xen are running in an non-contiguous memory architecture. When PCI pass-through is utilized, this necessitates an IOMMU for translating bus (DMA) to virtual and vice-versa and also providing a mechanism to have contiguous pages for device drivers operations (say DMA operations). Specifically, under Xen the Linux idea of pages is an illusion. It assumes that pages start at zero and go up to the available memory. To help with that, the Linux Xen MMU provides a lookup mechanism to translate the page frame numbers (PFN) to machine frame numbers (MFN) and vice-versa. The MFN are the "real" frame numbers. Furthermore memory is not contiguous. Xen hypervisor stitches memory for guests from different pools, which means there is no guarantee that PFN==MFN and PFN+1==MFN+1. Lastly with Xen 4.0, pages (in debug mode) are allocated in descending order (high to low), meaning the guest might never get any MFN's under the 4GB mark. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Acked-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Albert Herranz <albert_herranz@yahoo.es> Cc: Ian Campbell <Ian.Campbell@citrix.com>
2010-07-26x86: Call HVMOP_pagetable_dying on exit_mmap.Stefano Stabellini1-0/+11
When a pagetable is about to be destroyed, we notify Xen so that the hypervisor can clear the related shadow pagetable. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
2010-07-26x86: Unplug emulated disks and nics.Stefano Stabellini1-0/+49
Add a xen_emul_unplug command line option to the kernel to unplug xen emulated disks and nics. Set the default value of xen_emul_unplug depending on whether or not the Xen PV frontends and the Xen platform PCI driver have been compiled for this kernel (modules or built-in are both OK). The user can specify xen_emul_unplug=ignore to enable PV drivers on HVM even if the host platform doesn't support unplug. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
2010-07-26x86: Use xen_vcpuop_clockevent, xen_clocksource and xen wallclock.Stefano Stabellini1-0/+3
Use xen_vcpuop_clockevent instead of hpet and APIC timers as main clockevent device on all vcpus, use the xen wallclock time as wallclock instead of rtc and use xen_clocksource as clocksource. The pv clock algorithm needs to work correctly for the xen_clocksource and xen wallclock to be usable, only modern Xen versions offer a reliable pv clock in HVM guests (XENFEAT_hvm_safe_pvclock). Using the hpet as clocksource means a VMEXIT every time we read/write to the hpet mmio addresses, pvclock give us a better rating without VMEXITs. Same goes for the xen wallclock and xen_vcpuop_clockevent Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: Don Dutile <ddutile@redhat.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
2010-07-22xen: Add suspend/resume support for PV on HVM guests.Stefano Stabellini1-0/+3
Suspend/resume requires few different things on HVM: the suspend hypercall is different; we don't need to save/restore memory related settings; except the shared info page and the callback mechanism. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
2010-07-22xen: Xen PCI platform device driver.Stefano Stabellini2-0/+5
Add the xen pci platform device driver that is responsible for initializing the grant table and xenbus in PV on HVM mode. Few changes to xenbus and grant table are necessary to allow the delayed initialization in HVM mode. Grant table needs few additional modifications to work in HVM mode. The Xen PCI platform device raises an irq every time an event has been delivered to us. However these interrupts are only delivered to vcpu 0. The Xen PCI platform interrupt handler calls xen_hvm_evtchn_do_upcall that is a little wrapper around __xen_evtchn_do_upcall, the traditional Xen upcall handler, the very same used with traditional PV guests. When running on HVM the event channel upcall is never called while in progress because it is a normal Linux irq handler (and we cannot switch the irq chip wholesale to the Xen PV ones as we are running QEMU and might have passed in PCI devices), therefore we cannot be sure that evtchn_upcall_pending is 0 when returning. For this reason if evtchn_upcall_pending is set by Xen we need to loop again on the event channels set pending otherwise we might loose some event channel deliveries. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: Sheng Yang <sheng@linux.intel.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
2010-07-22x86/xen: event channels delivery on HVM.Sheng Yang3-0/+16
Set the callback to receive evtchns from Xen, using the callback vector delivery mechanism. The traditional way for receiving event channel notifications from Xen is via the interrupts from the platform PCI device. The callback vector is a newer alternative that allow us to receive notifications on any vcpu and doesn't need any PCI support: we allocate a vector exclusively to receive events, in the vector handler we don't need to interact with the vlapic, therefore we avoid a VMEXIT. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: Sheng Yang <sheng@linux.intel.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
2010-07-22xen: Add support for HVM hypercalls.Jeremy Fitzhardinge3-0/+154
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Sheng Yang <sheng@linux.intel.com> Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
2010-06-07xen: Add xen_create_contiguous_regionAlex Nixon2-0/+48
A memory region must be physically contiguous in order to be accessed through DMA. This patch adds xen_create_contiguous_region, which ensures a region of contiguous virtual memory is also physically contiguous. Based on Stephen Tweedie's port of the 2.6.18-xen version. Remove contiguous_bitmap[] as it's no longer needed. Ported from linux-2.6.18-xen.hg 707:e410857fd83c [ Impact: add Xen-internal API to make pages phys-contig ] Signed-off-by: Alex Nixon <alex.nixon@citrix.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2010-06-07xen: Rename the balloon lockAlex Nixon1-0/+8
* xen_create_contiguous_region needs access to the balloon lock to ensure memory doesn't change under its feet, so expose the balloon lock * Change the name of the lock to xen_reservation_lock, to imply it's now less-specific usage. [ Impact: cleanup ] Signed-off-by: Alex Nixon <alex.nixon@citrix.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2010-03-30include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.hTejun Heo1-0/+1
percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2009-11-04xen: move Xen-testing predicates to common headerJeremy Fitzhardinge1-0/+32
Move xen_domain and related tests out of asm-x86 to xen/xen.h so they can be included whenever they are necessary. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2009-03-30Merge branches 'for-linus/xen/dev-evtchn', 'for-linus/xen/xenbus', 'for-linus/xen/xenfs' and 'for-linus/xen/sys-hypervisor' into for-linus/xen/masterJeremy Fitzhardinge5-2/+96
* for-linus/xen/dev-evtchn: xen/dev-evtchn: clean up locking in evtchn xen: export ioctl headers to userspace xen: add /dev/xen/evtchn driver xen: add irq_from_evtchn * for-linus/xen/xenbus: xen/xenbus: export xenbus_dev_changed xen: use device model for suspending xenbus devices xen: remove suspend_cancel hook * for-linus/xen/xenfs: xen: add "capabilities" file * for-linus/xen/sys-hypervisor: xen: drop kexec bits from /sys/hypervisor since kexec isn't implemented yet xen/sys/hypervisor: change writable_pt to features xen: add /sys/hypervisor support Conflicts: drivers/xen/Makefile
2009-03-30xen: add /sys/hypervisor supportJeremy Fitzhardinge1-0/+3
Adds support for Xen info under /sys/hypervisor. Taken from Novell 2.6.27 backport tree. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
2009-03-30xen: use device model for suspending xenbus devicesIan Campbell1-1/+1
Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
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