- 08 4月, 2012 22 次提交
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由 Takuya Yoshikawa 提交于
Now that we do neither double buffering nor heuristic selection of the write protection method these are not needed anymore. Note: some drivers have their own implementation of set_bit_le() and making it generic needs a bit of work; so we use test_and_set_bit_le() and will later replace it with generic set_bit_le(). Signed-off-by: NTakuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp> Signed-off-by: NAvi Kivity <avi@redhat.com>
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由 Takuya Yoshikawa 提交于
We have seen some problems of the current implementation of get_dirty_log() which uses synchronize_srcu_expedited() for updating dirty bitmaps; e.g. it is noticeable that this sometimes gives us ms order of latency when we use VGA displays. Furthermore the recent discussion on the following thread "srcu: Implement call_srcu()" http://lkml.org/lkml/2012/1/31/211 also motivated us to implement get_dirty_log() without SRCU. This patch achieves this goal without sacrificing the performance of both VGA and live migration: in practice the new code is much faster than the old one unless we have too many dirty pages. Implementation: The key part of the implementation is the use of xchg() operation for clearing dirty bits atomically. Since this allows us to update only BITS_PER_LONG pages at once, we need to iterate over the dirty bitmap until every dirty bit is cleared again for the next call. Although some people may worry about the problem of using the atomic memory instruction many times to the concurrently accessible bitmap, it is usually accessed with mmu_lock held and we rarely see concurrent accesses: so what we need to care about is the pure xchg() overheads. Another point to note is that we do not use for_each_set_bit() to check which ones in each BITS_PER_LONG pages are actually dirty. Instead we simply use __ffs() in a loop. This is much faster than repeatedly call find_next_bit(). Performance: The dirty-log-perf unit test showed nice improvements, some times faster than before, except for some extreme cases; for such cases the speed of getting dirty page information is much faster than we process it in the userspace. For real workloads, both VGA and live migration, we have observed pure improvements: when the guest was reading a file during live migration, we originally saw a few ms of latency, but with the new method the latency was less than 200us. Signed-off-by: NTakuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp> Signed-off-by: NAvi Kivity <avi@redhat.com>
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由 Takuya Yoshikawa 提交于
Dropped such mappings when we enabled dirty logging and we will never create new ones until we stop the logging. For this we introduce a new function which can be used to write protect a range of PT level pages: although we do not need to care about a range of pages at this point, the following patch will need this feature to optimize the write protection of many pages. Signed-off-by: NTakuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp> Signed-off-by: NAvi Kivity <avi@redhat.com>
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由 Takuya Yoshikawa 提交于
We will use this in the following patch to implement another function which needs to write protect pages using the rmap information. Note that there is a small change in debug printing for large pages: we do not differentiate them from others to avoid duplicating code. Signed-off-by: NTakuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp> Signed-off-by: NAvi Kivity <avi@redhat.com>
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由 Eric B Munson 提交于
check_and_clear_guest_paused does not need to be exported as it isn't used by any modules, remove the export. Signed-off-by: NEric B Munson <emunson@mgebm.net> Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com> Signed-off-by: NAvi Kivity <avi@redhat.com>
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由 Marcelo Tosatti 提交于
S390's kvm_vcpu_stat does not contain halt_wakeup member. Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com> Signed-off-by: NAvi Kivity <avi@redhat.com>
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由 Eric B Munson 提交于
A suspended VM can cause spurious soft lockup warnings. To avoid these, the watchdog now checks if the kernel knows it was stopped by the host and skips the warning if so. When the watchdog is reset successfully, clear the guest paused flag. Signed-off-by: NEric B Munson <emunson@mgebm.net> Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com> Signed-off-by: NAvi Kivity <avi@redhat.com>
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由 Eric B Munson 提交于
Now that we have a flag that will tell the guest it was suspended, create an interface for that communication using a KVM ioctl. Signed-off-by: NEric B Munson <emunson@mgebm.net> Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com> Signed-off-by: NAvi Kivity <avi@redhat.com>
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由 Eric B Munson 提交于
When a host stops or suspends a VM it will set a flag to show this. The watchdog will use these functions to determine if a softlockup is real, or the result of a suspended VM. Signed-off-by: NEric B Munson <emunson@mgebm.net> asm-generic changes Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com> Signed-off-by: NAvi Kivity <avi@redhat.com>
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由 Eric B Munson 提交于
This flag will be used to check if the vm was stopped by the host when a soft lockup was detected. The host will set the flag when it stops the guest. On resume, the guest will check this flag if a soft lockup is detected and skip issuing the warning. Signed-off-by: NEric B Munson <emunson@mgebm.net> Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com> Signed-off-by: NAvi Kivity <avi@redhat.com>
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由 Alexander Graf 提交于
On PowerPC, we sometimes use a waitqueue per core, not per thread, so we can't always use the vcpu internal waitqueue. This code has been generalized by Christoffer Dall recently, but unfortunately broke compilation for PowerPC. At the time the helper function is defined, struct kvm_vcpu is not declared yet, so we can't dereference it. This patch moves all logic into the generic inline function, at which time we have all information necessary. Signed-off-by: NAlexander Graf <agraf@suse.de> Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com> Signed-off-by: NAvi Kivity <avi@redhat.com>
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由 Christoffer Dall 提交于
The kvm_vcpu_kick function performs roughly the same funcitonality on most all architectures, so we shouldn't have separate copies. PowerPC keeps a pointer to interchanging waitqueues on the vcpu_arch structure and to accomodate this special need a __KVM_HAVE_ARCH_VCPU_GET_WQ define and accompanying function kvm_arch_vcpu_wq have been defined. For all other architectures this is a generic inline that just returns &vcpu->wq; Acked-by: NScott Wood <scottwood@freescale.com> Signed-off-by: NChristoffer Dall <c.dall@virtualopensystems.com> Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com> Signed-off-by: NAvi Kivity <avi@redhat.com>
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由 Avi Kivity 提交于
Deprecated in favour of tracepoints. Signed-off-by: NAvi Kivity <avi@redhat.com> Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com> Signed-off-by: NAvi Kivity <avi@redhat.com>
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由 Jason Wang 提交于
Also count the exits of fast-path. Signed-off-by: NJason Wang <jasowang@redhat.com> Acked-by: NJoerg Roedel <joerg.roedel@amd.com> Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com> Signed-off-by: NAvi Kivity <avi@redhat.com>
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由 Amos Kong 提交于
kvm_io_bus devices are used for ioevent, pit, pic, ioapic, coalesced_mmio. Currently Qemu only emulates one PCI bus, it contains 32 slots, one slot contains 8 functions, maximum of supported PCI devices: 1 * 32 * 8 = 256. One virtio-blk takes one iobus device, one virtio-net(vhost=on) takes two iobus devices. The maximum of coalesced mmio zone is 100, each zone has an iobus devices. So 300 io_bus devices are not enough. Set an upper bounds for kvm_io_range to limit userspace. 1000 is a very large limit and not bloat the typical user. Signed-off-by: NAmos Kong <akong@redhat.com> Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com> Signed-off-by: NAvi Kivity <avi@redhat.com>
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由 Amos Kong 提交于
This patch makes the kvm_io_range array can be resized dynamically. Signed-off-by: NAmos Kong <akong@redhat.com> Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com> Signed-off-by: NAvi Kivity <avi@redhat.com>
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由 Liu, Jinsong 提交于
Intel recently release 2 new features, HLE and RTM. Refer to http://software.intel.com/file/41417. This patch expose them to guest. Signed-off-by: NLiu, Jinsong <jinsong.liu@intel.com> Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com> Signed-off-by: NAvi Kivity <avi@redhat.com>
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由 Linus Torvalds 提交于
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git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap由 Linus Torvalds 提交于
Pull two more small regmap fixes from Mark Brown: - Now we have users for it that aren't running Android it turns out that regcache_sync_region() is much more useful to drivers if it's exported for use by modules. Who knew? - Make sure we don't divide by zero when doing debugfs dumps of rbtrees, not visible up until now because everything was providing at least some cache on startup. * tag 'regmap-3.4-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap: regmap: prevent division by zero in rbtree_show regmap: Export regcache_sync_region()
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git://git.kernel.org/pub/scm/virt/kvm/kvm由 Linus Torvalds 提交于
Pull a few KVM fixes from Avi Kivity: "A bunch of powerpc KVM fixes, a guest and a host RCU fix (unrelated), and a small build fix." * 'kvm-updates/3.4' of git://git.kernel.org/pub/scm/virt/kvm/kvm: KVM: Resolve RCU vs. async page fault problem KVM: VMX: vmx_set_cr0 expects kvm->srcu locked KVM: PMU: Fix integer constant is too large warning in kvm_pmu_set_msr() KVM: PPC: Book3S: PR: Fix preemption KVM: PPC: Save/Restore CR over vcpu_run KVM: PPC: Book3S HV: Save and restore CR in __kvmppc_vcore_entry KVM: PPC: Book3S HV: Fix kvm_alloc_linear in case where no linears exist KVM: PPC: Book3S: Compile fix for ppc32 in HIOR access code
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git://github.com/pmundt/linux-sh由 Linus Torvalds 提交于
Pull SuperH fixes from Paul Mundt. * tag 'sh-for-linus' of git://github.com/pmundt/linux-sh: sh: fix clock-sh7757 for the latest sh_mobile_sdhi driver serial: sh-sci: use serial_port_in/out vs sci_in/out. sh: vsyscall: Fix up .eh_frame generation. sh: dma: Fix up device attribute mismatch from sysdev fallout. sh: dwarf unwinder depends on SHcompact. sh: fix up fallout from system.h disintegration.
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git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security由 Linus Torvalds 提交于
Pull security layer fixlet from James Morris. * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security: sysctl: fix write access to dmesg_restrict/kptr_restrict
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- 07 4月, 2012 17 次提交
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git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux由 Linus Torvalds 提交于
Pull ACPI & Power Management patches from Len Brown: "Two fixes for cpuidle merge-window changes, plus a URL fix in MAINTAINERS" * 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux: MAINTAINERS: Update git url for ACPI cpuidle: Fix panic in CPU off-lining with no idle driver ACPI processor: Use safe_halt() rather than halt() in acpi_idle_play_dead()
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git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending由 Linus Torvalds 提交于
Pull target fixes from Nicholas Bellinger: "Pull two tcm_fc fabric related fixes for -rc2: Note that both have been CC'ed to stable, and patch #1 is the important one that addresses a memory corruption bug related to FC exchange timeouts + command abort. Thanks again to MDR for tracking down this issue!" * '3.4-rc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending: tcm_fc: Do not free tpg structure during wq allocation failure tcm_fc: Add abort flag for gracefully handling exchange timeout
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由 Mark Rustad 提交于
Avoid freeing a registered tpg structure if an alloc_workqueue call fails. This fixes a bug where the failure was leaking memory associated with se_portal_group setup during the original core_tpg_register() call. Signed-off-by: NMark Rustad <mark.d.rustad@intel.com> Acked-by: NKiran Patil <Kiran.patil@intel.com> Cc: <stable@vger.kernel.org> Signed-off-by: NNicholas Bellinger <nab@linux-iscsi.org>
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由 Mark Rustad 提交于
Add abort flag and use it to terminate processing when an exchange is timed out or is reset. The abort flag is used in place of the transport_generic_free_cmd function call in the reset and timeout cases, because calling that function in that context would free memory that was in use. The aborted flag allows the lifetime to be managed in a more normal way, while truncating the processing. This change eliminates a source of memory corruption which manifested in a variety of ugly ways. (nab: Drop unused struct fc_exch *ep in ft_recv_seq) Signed-off-by: NMark Rustad <mark.d.rustad@intel.com> Acked-by: NKiran Patil <Kiran.patil@intel.com> Cc: <stable@vger.kernel.org> Signed-off-by: NNicholas Bellinger <nab@linux-iscsi.org>
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由 Len Brown 提交于
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由 Igor Murzov 提交于
Signed-off-by: NIgor Murzov <e-mail@date.by> Signed-off-by: NLen Brown <len.brown@intel.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile由 Linus Torvalds 提交于
Pull arch/tile bug fixes from Chris Metcalf: "This includes Paul Gortmaker's change to fix the <asm/system.h> disintegration issues on tile, a fix to unbreak the tilepro ethernet driver, and a backlog of bugfix-only changes from internal Tilera development over the last few months. They have all been to LKML and on linux-next for the last few days. The EDAC change to MAINTAINERS is an oddity but discussion on the linux-edac list suggested I ask you to pull that change through my tree since they don't have a tree to pull edac changes from at the moment." * 'stable' of git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile: (39 commits) drivers/net/ethernet/tile: fix netdev_alloc_skb() bombing MAINTAINERS: update EDAC information tilepro ethernet driver: fix a few minor issues tile-srom.c driver: minor code cleanup edac: say "TILEGx" not "TILEPro" for the tilegx edac driver arch/tile: avoid accidentally unmasking NMI-type interrupt accidentally arch/tile: remove bogus performance optimization arch/tile: return SIGBUS for addresses that are unaligned AND invalid arch/tile: fix finv_buffer_remote() for tilegx arch/tile: use atomic exchange in arch_write_unlock() arch/tile: stop mentioning the "kvm" subdirectory arch/tile: export the page_home() function. arch/tile: fix pointer cast in cacheflush.c arch/tile: fix single-stepping over swint1 instructions on tilegx arch/tile: implement panic_smp_self_stop() arch/tile: add "nop" after "nap" to help GX idle power draw arch/tile: use proper memparse() for "maxmem" options arch/tile: fix up locking in pgtable.c slightly arch/tile: don't leak kernel memory when we unload modules arch/tile: fix bug in delay_backoff() ...
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由 Linus Torvalds 提交于
Merge tag 'stable/for-linus-3.4-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen Pull xen fixes from Konrad Rzeszutek Wilk: "Two fixes for regressions: * one is a workaround that will be removed in v3.5 with proper fix in the tip/x86 tree, * the other is to fix drivers to load on PV (a previous patch made them only load in PVonHVM mode). The rest are just minor fixes in the various drivers and some cleanup in the core code." * tag 'stable/for-linus-3.4-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen: xen/pcifront: avoid pci_frontend_enable_msix() falsely returning success xen/pciback: fix XEN_PCI_OP_enable_msix result xen/smp: Remove unnecessary call to smp_processor_id() xen/x86: Workaround 'x86/ioapic: Add register level checks to detect bogus io-apic entries' xen: only check xen_platform_pci_unplug if hvm
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git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc由 Linus Torvalds 提交于
Pull MMC fixes from Chris Ball: - Disable use of MSI in sdhci-pci, which caused multiple chipsets to stop working in 3.4-rc1. I'll wait to turn this on again until we have a chipset whitelist for it. - Fix a libertas SDIO powered-resume regression introduced in 3.3; thanks to Neil Brown and Rafael Wysocki for this fix. - Fix module reloading on omap_hsmmc. - Stop trusting the spec/card's specified maximum data timeout length, and use three seconds instead. Previously we used 300ms. Also cleanups and fixes for s3c, atmel, sh_mmcif and omap_hsmmc. * tag 'mmc-fixes-for-3.4-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc: (28 commits) mmc: use really long write timeout to deal with crappy cards mmc: sdhci-dove: Fix compile error by including module.h mmc: Prevent 1.8V switch for SD hosts that don't support UHS modes. Revert "mmc: sdhci-pci: Add MSI support" Revert "mmc: sdhci-pci: add quirks for broken MSI on O2Micro controllers" mmc: core: fix power class selection mmc: omap_hsmmc: fix module re-insertion mmc: omap_hsmmc: convert to module_platform_driver mmc: omap_hsmmc: make it behave well as a module mmc: omap_hsmmc: trivial cleanups mmc: omap_hsmmc: context save after enabling runtime pm mmc: omap_hsmmc: use runtime put sync in probe error patch mmc: sdio: Use empty system suspend/resume callbacks at the bus level mmc: bus: print bus speed mode of UHS-I card mmc: sdhci-pci: add quirks for broken MSI on O2Micro controllers mmc: sh_mmcif: Simplify calculation of mmc->f_min mmc: sh_mmcif: mmc->f_max should be half of the bus clock mmc: sh_mmcif: double clock speed mmc: block: Remove use of mmc_blk_set_blksize mmc: atmel-mci: add support for odd clock dividers ...
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由 Linus Torvalds 提交于
I have a new optimized x86 "strncpy_from_user()" that will use these same helper functions for all the same reasons the name lookup code uses them. This is preparation for that. This moves them into an architecture-specific header file. It's architecture-specific for two reasons: - some of the functions are likely to want architecture-specific implementations. Even if the current code happens to be "generic" in the sense that it should work on any little-endian machine, it's likely that the "multiply by a big constant and shift" implementation is less than optimal for an architecture that has a guaranteed fast bit count instruction, for example. - I expect that if architectures like sparc want to start playing around with this, we'll need to abstract out a few more details (in particular the actual unaligned accesses). So we're likely to have more architecture-specific stuff if non-x86 architectures start using this. (and if it turns out that non-x86 architectures don't start using this, then having it in an architecture-specific header is still the right thing to do, of course) Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Toshi Kani 提交于
Fix a NULL pointer dereference panic in cpuidle_play_dead() during CPU off-lining when no cpuidle driver is registered. A cpuidle driver may be registered at boot-time based on CPU type. This patch allows an off-lined CPU to enter HLT-based idle in this condition. Signed-off-by: NToshi Kani <toshi.kani@hp.com> Cc: Boris Ostrovsky <boris.ostrovsky@amd.com> Reviewed-by: NSrivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Tested-by: NSrivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Signed-off-by: NLen Brown <len.brown@intel.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/davem/net由 Linus Torvalds 提交于
Pull networking updates from David Miller: 1) Fix inaccuracies in network driver interface documentation, from Ben Hutchings. 2) Fix handling of negative offsets in BPF JITs, from Jan Seiffert. 3) Compile warning, locking, and refcounting fixes in netfilter's xt_CT, from Pablo Neira Ayuso. 4) phonet sendmsg needs to validate user length just like any other datagram protocol, fix from Sasha Levin. 5) Ipv6 multicast code uses wrong loop index, from RongQing Li. 6) Link handling and firmware fixes in bnx2x driver from Yaniv Rosner and Yuval Mintz. 7) mlx4 erroneously allocates 4 pages at a time, regardless of page size, fix from Thadeu Lima de Souza Cascardo. 8) SCTP socket option wasn't extended in a backwards compatible way, fix from Thomas Graf. 9) Add missing address change event emissions to bonding, from Shlomo Pongratz. 10) /proc/net/dev regressed because it uses a private offset to track where we are in the hash table, but this doesn't track the offset pullback that the seq_file code does resulting in some entries being missed in large dumps. Fix from Eric Dumazet. 11) do_tcp_sendpage() unloads the send queue way too fast, because it invokes tcp_push() when it shouldn't. Let the natural sequence generated by the splice paths, and the assosciated MSG_MORE settings, guide the tcp_push() calls. Otherwise what goes out of TCP is spaghetti and doesn't batch effectively into GSO/TSO clusters. From Eric Dumazet. 12) Once we put a SKB into either the netlink receiver's queue or a socket error queue, it can be consumed and freed up, therefore we cannot touch it after queueing it like that. Fixes from Eric Dumazet. 13) PPP has this annoying behavior in that for every transmit call it immediately stops the TX queue, then calls down into the next layer to transmit the PPP frame. But if that next layer can take it immediately, it just un-stops the TX queue right before returning from the transmit method. Besides being useless work, it makes several facilities unusable, in particular things like the equalizers. Well behaved devices should only stop the TX queue when they really are full, and in PPP's case when it gets backlogged to the downstream device. David Woodhouse therefore fixed PPP to not stop the TX queue until it's downstream can't take data any more. 14) IFF_UNICAST_FLT got accidently lost in some recent stmmac driver changes, re-add. From Marc Kleine-Budde. 15) Fix link flaps in ixgbe, from Eric W. Multanen. 16) Descriptor writeback fixes in e1000e from Matthew Vick. * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (47 commits) net: fix a race in sock_queue_err_skb() netlink: fix races after skb queueing doc, net: Update ndo_start_xmit return type and values doc, net: Remove instruction to set net_device::trans_start doc, net: Update netdev operation names doc, net: Update documentation of synchronisation for TX multiqueue doc, net: Remove obsolete reference to dev->poll ethtool: Remove exception to the requirement of holding RTNL lock MAINTAINERS: update for Marvell Ethernet drivers bonding: properly unset current_arp_slave on slave link up phonet: Check input from user before allocating tcp: tcp_sendpages() should call tcp_push() once ipv6: fix array index in ip6_mc_add_src() mlx4: allocate just enough pages instead of always 4 pages stmmac: re-add IFF_UNICAST_FLT for dwmac1000 bnx2x: Clear MDC/MDIO warning message bnx2x: Fix BCM57711+BCM84823 link issue bnx2x: Clear BCM84833 LED after fan failure bnx2x: Fix BCM84833 PHY FW version presentation bnx2x: Fix link issue for BCM8727 boards. ...
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由 Jan Beulich 提交于
The original XenoLinux code has always had things this way, and for compatibility reasons (in particular with a subsequent pciback adjustment) upstream Linux should behave the same way (allowing for two distinct error indications to be returned by the backend). Signed-off-by: NJan Beulich <jbeulich@suse.com> Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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由 Jan Beulich 提交于
Prior to 2.6.19 and as of 2.6.31, pci_enable_msix() can return a positive value to indicate the number of vectors (less than the amount requested) that can be set up for a given device. Returning this as an operation value (secondary result) is fine, but (primary) operation results are expected to be negative (error) or zero (success) according to the protocol. With the frontend fixed to match the XenoLinux behavior, the backend can now validly return zero (success) here, passing the upper limit on the number of vectors in op->value. Signed-off-by: NJan Beulich <jbeulich@suse.com> Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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由 Srivatsa S. Bhat 提交于
There is an extra and unnecessary call to smp_processor_id() in cpu_bringup(). Remove it. Signed-off-by: NSrivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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由 Konrad Rzeszutek Wilk 提交于
The above mentioned patch checks the IOAPIC and if it contains -1, then it unmaps said IOAPIC. But under Xen we get this: BUG: unable to handle kernel NULL pointer dereference at 0000000000000040 IP: [<ffffffff8134e51f>] xen_irq_init+0x1f/0xb0 PGD 0 Oops: 0002 [#1] SMP CPU 0 Modules linked in: Pid: 1, comm: swapper/0 Not tainted 3.2.10-3.fc16.x86_64 #1 Dell Inc. Inspiron 1525 /0U990C RIP: e030:[<ffffffff8134e51f>] [<ffffffff8134e51f>] xen_irq_init+0x1f/0xb0 RSP: e02b: ffff8800d42cbb70 EFLAGS: 00010202 RAX: 0000000000000000 RBX: 00000000ffffffef RCX: 0000000000000001 RDX: 0000000000000040 RSI: 00000000ffffffef RDI: 0000000000000001 RBP: ffff8800d42cbb80 R08: ffff8800d6400000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 00000000ffffffef R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000010 FS: 0000000000000000(0000) GS:ffff8800df5fe000(0000) knlGS:0000000000000000 CS: e033 DS: 0000 ES: 0000 CR0:000000008005003b CR2: 0000000000000040 CR3: 0000000001a05000 CR4: 0000000000002660 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process swapper/0 (pid: 1, threadinfo ffff8800d42ca000, task ffff8800d42d0000) Stack: 00000000ffffffef 0000000000000010 ffff8800d42cbbe0 ffffffff8134f157 ffffffff8100a9b2 ffffffff8182ffd1 00000000000000a0 00000000829e7384 0000000000000002 0000000000000010 00000000ffffffff 0000000000000000 Call Trace: [<ffffffff8134f157>] xen_bind_pirq_gsi_to_irq+0x87/0x230 [<ffffffff8100a9b2>] ? check_events+0x12+0x20 [<ffffffff814bab42>] xen_register_pirq+0x82/0xe0 [<ffffffff814bac1a>] xen_register_gsi.part.2+0x4a/0xd0 [<ffffffff814bacc0>] acpi_register_gsi_xen+0x20/0x30 [<ffffffff8103036f>] acpi_register_gsi+0xf/0x20 [<ffffffff8131abdb>] acpi_pci_irq_enable+0x12e/0x202 [<ffffffff814bc849>] pcibios_enable_device+0x39/0x40 [<ffffffff812dc7ab>] do_pci_enable_device+0x4b/0x70 [<ffffffff812dc878>] __pci_enable_device_flags+0xa8/0xf0 [<ffffffff812dc8d3>] pci_enable_device+0x13/0x20 The reason we are dying is b/c the call acpi_get_override_irq() is used, which returns the polarity and trigger for the IRQs. That function calls mp_find_ioapics to get the 'struct ioapic' structure - which along with the mp_irq[x] is used to figure out the default values and the polarity/trigger overrides. Since the mp_find_ioapics now returns -1 [b/c the IOAPIC is filled with 0xffffffff], the acpi_get_override_irq() stops trying to lookup in the mp_irq[x] the proper INT_SRV_OVR and we can't install the SCI interrupt. The proper fix for this is going in v3.5 and adds an x86_io_apic_ops struct so that platforms can override it. But for v3.4 lets carry this work-around. This patch does that by providing a slightly different variant of the fake IOAPIC entries. Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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由 Igor Mammedov 提交于
commit b9136d207f08 xen: initialize platform-pci even if xen_emul_unplug=never breaks blkfront/netfront by not loading them because of xen_platform_pci_unplug=0 and it is never set for PV guest. Signed-off-by: NAndrew Jones <drjones@redhat.com> Signed-off-by: NIgor Mammedov <imammedo@redhat.com> Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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- 06 4月, 2012 1 次提交
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由 Eric Dumazet 提交于
As soon as an skb is queued into socket error queue, another thread can consume it, so we are not allowed to reference skb anymore, or risk use after free. Signed-off-by: NEric Dumazet <eric.dumazet@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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