- 02 Dec, 2016 3 commits
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Radim Krčmář authored
commit 2117d539 upstream. em_jmp_far and em_ret_far assumed that setting IP can only fail in 64 bit mode, but syzkaller proved otherwise (and SDM agrees). Code segment was restored upon failure, but it was left uninitialized outside of long mode, which could lead to a leak of host kernel stack. We could have fixed that by always saving and restoring the CS, but we take a simpler approach and just break any guest that manages to fail as the error recovery is error-prone and modern CPUs don't need emulator for this. Found by syzkaller: WARNING: CPU: 2 PID: 3668 at arch/x86/kvm/emulate.c:2217 em_ret_far+0x428/0x480 Kernel panic - not syncing: panic_on_warn set ... CPU: 2 PID: 3668 Comm: syz-executor Not tainted 4.9.0-rc4+ #49 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 [...] Call Trace: [...] __dump_stack lib/dump_stack.c:15 [...] dump_stack+0xb3/0x118 lib/dump_stack.c:51 [...] panic+0x1b7/0x3a3 kernel/panic.c:179 [...] __warn+0x1c4/0x1e0 kernel/panic.c:542 [...] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585 [...] em_ret_far+0x428/0x480 arch/x86/kvm/emulate.c:2217 [...] em_ret_far_imm+0x17/0x70 arch/x86/kvm/emulate.c:2227 [...] x86_emulate_insn+0x87a/0x3730 arch/x86/kvm/emulate.c:5294 [...] x86_emulate_instruction+0x520/0x1ba0 arch/x86/kvm/x86.c:5545 [...] emulate_instruction arch/x86/include/asm/kvm_host.h:1116 [...] complete_emulated_io arch/x86/kvm/x86.c:6870 [...] complete_emulated_mmio+0x4e9/0x710 arch/x86/kvm/x86.c:6934 [...] kvm_arch_vcpu_ioctl_run+0x3b7a/0x5a90 arch/x86/kvm/x86.c:6978 [...] kvm_vcpu_ioctl+0x61e/0xdd0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2557 [...] vfs_ioctl fs/ioctl.c:43 [...] do_vfs_ioctl+0x18c/0x1040 fs/ioctl.c:679 [...] SYSC_ioctl fs/ioctl.c:694 [...] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685 [...] entry_SYSCALL_64_fastpath+0x1f/0xc2 Reported-by:
Dmitry Vyukov <dvyukov@google.com> Fixes: d1442d85 ("KVM: x86: Handle errors when RIP is set during far jumps") Signed-off-by:
Radim Krčmář <rkrcmar@redhat.com> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Ashok Raj authored
commit 1c387188 upstream. The VT-d specification (§8.3.3) says: ‘Virtual Functions’ of a ‘Physical Function’ are under the scope of the same remapping unit as the ‘Physical Function’. The BIOS is not required to list all the possible VFs in the scope tables, and arguably *shouldn't* make any attempt to do so, since there could be a huge number of them. This has been broken basically for ever — the VF is never going to match against a specific unit's scope, so it ends up being assigned to the INCLUDE_ALL IOMMU. Which was always actually correct by coincidence, but now we're looking at Root-Complex integrated devices with SR-IOV support it's going to start being wrong. Fix it to simply use pci_physfn() before doing the lookup for PCI devices. Signed-off-by:
Sainath Grandhi <sainath.grandhi@intel.com> Signed-off-by:
Ashok Raj <ashok.raj@intel.com> Signed-off-by:
David Woodhouse <dwmw2@infradead.org> Signed-off-by:
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David Woodhouse authored
commit 91017044 upstream. Somehow I ended up with an off-by-three error in calculating the size of the PASID and PASID State tables, which triggers allocations failures as those tables unfortunately have to be physically contiguous. In fact, even the *correct* maximum size of 8MiB is problematic and is wont to lead to allocation failures. Since I have extracted a promise that this *will* be fixed in hardware, I'm happy to limit it on the current hardware to a maximum of 0x20000 PASIDs, which gives us 1MiB tables — still not ideal, but better than before. Reported by Mika Kuoppala <mika.kuoppala@linux.intel.com> and also by Xunlei Pang <xlpang@redhat.com> who submitted a simpler patch to fix only the allocation (and not the free) to the "correct" limit... which was still problematic. Signed-off-by:
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- 26 Nov, 2016 32 commits
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Greg Kroah-Hartman authored
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Anders K. Pedersen authored
commit a8b1e36d upstream. With HZ=100 element timeout in dynamic sets (i.e. flow tables) is 10 times higher than configured. Add proper conversion to/from jiffies, when interacting with userspace. I tested this on Linux 4.8.1, and it applies cleanly to current nf and nf-next trees. Fixes: 22fe54d5 ("netfilter: nf_tables: add support for dynamic set updates") Signed-off-by:
Anders K. Pedersen <akp@cohaesio.com> Signed-off-by:
Pablo Neira Ayuso <pablo@netfilter.org> Signed-off-by:
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Mark Bloch authored
commit 9db0ff53 upstream. When there is a CM id object that has port assigned to it, it means that the cm-id asked for the specific port that it should go by it, but if that port was removed (hot-unplug event) the cm-id was not updated. In order to fix that the port keeps a list of all the cm-id's that are planning to go by it, whenever the port is removed it marks all of them as invalid. This commit fixes a kernel panic which happens when running traffic between guests and we force reboot a guest mid traffic, it triggers a kernel panic: Call Trace: [<ffffffff815271fa>] ? panic+0xa7/0x16f [<ffffffff8152b534>] ? oops_end+0xe4/0x100 [<ffffffff8104a00b>] ? no_context+0xfb/0x260 [<ffffffff81084db2>] ? del_timer_sync+0x22/0x30 [<ffffffff8104a295>] ? __bad_area_nosemaphore+0x125/0x1e0 [<ffffffff81084240>] ? process_timeout+0x0/0x10 [<ffffffff8104a363>] ? bad_area_nosemaphore+0x13/0x20 [<ffffffff8104aabf>] ? __do_page_fault+0x31f/0x480 [<ffffffff81065df0>] ? default_wake_function+0x0/0x20 [<ffffffffa0752675>] ? free_msg+0x55/0x70 [mlx5_core] [<ffffffffa0753434>] ? cmd_exec+0x124/0x840 [mlx5_core] [<ffffffff8105a924>] ? find_busiest_group+0x244/0x9f0 [<ffffffff8152d45e>] ? do_page_fault+0x3e/0xa0 [<ffffffff8152a815>] ? page_fault+0x25/0x30 [<ffffffffa024da25>] ? cm_alloc_msg+0x35/0xc0 [ib_cm] [<ffffffffa024e821>] ? ib_send_cm_dreq+0xb1/0x1e0 [ib_cm] [<ffffffffa024f836>] ? cm_destroy_id+0x176/0x320 [ib_cm] [<ffffffffa024fb00>] ? ib_destroy_cm_id+0x10/0x20 [ib_cm] [<ffffffffa034f527>] ? ipoib_cm_free_rx_reap_list+0xa7/0x110 [ib_ipoib] [<ffffffffa034f590>] ? ipoib_cm_rx_reap+0x0/0x20 [ib_ipoib] [<ffffffffa034f5a5>] ? ipoib_cm_rx_reap+0x15/0x20 [ib_ipoib] [<ffffffff81094d20>] ? worker_thread+0x170/0x2a0 [<ffffffff8109b2a0>] ? autoremove_wake_function+0x0/0x40 [<ffffffff81094bb0>] ? worker_thread+0x0/0x2a0 [<ffffffff8109aef6>] ? kthread+0x96/0xa0 [<ffffffff8100c20a>] ? child_rip+0xa/0x20 [<ffffffff8109ae60>] ? kthread+0x0/0xa0 [<ffffffff8100c200>] ? child_rip+0x0/0x20 Fixes: a977049d ("[PATCH] IB: Add the kernel CM implementation") Signed-off-by:
Mark Bloch <markb@mellanox.com> Signed-off-by:
Erez Shitrit <erezsh@mellanox.com> Reviewed-by:
Maor Gottlieb <maorg@mellanox.com> Signed-off-by:
Leon Romanovsky <leon@kernel.org> Signed-off-by:
Doug Ledford <dledford@redhat.com> Signed-off-by:
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Tariq Toukan authored
commit 5b810a24 upstream. The real QP is destroyed in case of the ref count reaches zero, but for XRC target QPs this call was missed and caused to QP leaks. Let's call to destroy for all flows. Fixes: 0e0ec7e0 ('RDMA/core: Export ib_open_qp() to share XRC...') Signed-off-by:
Tariq Toukan <tariqt@mellanox.com> Signed-off-by:
Noa Osherovich <noaos@mellanox.com> Signed-off-by:
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Mark Bloch authored
commit 3c7ba576 upstream. sg_alloc_table gets unsigned int as parameter while the driver returns it as size_t. Check npages isn't greater than maximum unsigned int. Fixes: eeb8461e ("IB: Refactor umem to use linear SG table") Signed-off-by:
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Eli Cohen authored
commit dbaaff2a upstream. When an internal error condition is detected, make sure to set the device inactive after dispatching the event so ULPs can get a notification of this event. Fixes: e126ba97 ('mlx5: Add driver for Mellanox Connect-IB adapters') Signed-off-by:
Eli Cohen <eli@mellanox.com> Signed-off-by:
Mohamad Haj Yahia <mohamad@mellanox.com> Signed-off-by:
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Daniel Jurgens authored
commit 16b0e069 upstream. When creating kernel CQs use 128B CQE stride if the cache line size is 128B, 64B otherwise. This prevents multiple CQEs from residing in a 128B cache line, which can cause retries when there are concurrent read and writes in one cache line. Tested with IPoIB on PPC64, saw ~5% throughput improvement. Fixes: e126ba97 ('mlx5: Add driver for Mellanox Connect-IB adapters') Signed-off-by:
Daniel Jurgens <danielj@mellanox.com> Signed-off-by:
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Matan Barak authored
commit 593ff73b upstream. Currently, if ib_copy_to_udata fails, the CQ won't be deleted from the radix tree and the HW (HW2SW). Fixes: 225c7b1f ('IB/mlx4: Add a driver Mellanox ConnectX InfiniBand adapters') Signed-off-by:
Matan Barak <matanb@mellanox.com> Signed-off-by:
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Daniel Jurgens authored
commit 37995116 upstream. Check the returned GID index value and return an error if it is invalid. Fixes: 5070cd22 ('IB/mlx4: Replace mechanism for RoCE GID management') Signed-off-by:
Yuval Shaia <yuval.shaia@oracle.com> Signed-off-by:
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Brian Norris authored
commit 6f75c3fd upstream. Consider two devices, A and B, where B is a child of A, and B utilizes asynchronous suspend (it does not matter whether A is sync or async). If B fails to suspend_noirq() or suspend_late(), or is interrupted by a wakeup (pm_wakeup_pending()), then it aborts and sets the async_error variable. However, device A does not (immediately) check the async_error variable; it may continue to run its own suspend_noirq()/suspend_late() callback. This is bad. We can resolve this problem by doing our error and wakeup checking (particularly, for the async_error flag) after waiting for children to suspend, instead of before. This also helps align the logic for the noirq and late suspend cases with the logic in __device_suspend(). It's easy to observe this erroneous behavior by, for example, forcing a device to sleep a bit in its suspend_noirq() (to ensure the parent is waiting for the child to complete), then return an error, and watch the parent suspend_noirq() still get called. (Or similarly, fake a wakeup event at the right (or is it wrong?) time.) Fixes: de377b39 (PM / sleep: Asynchronous threads for suspend_late) Fixes: 28b6fd6e (PM / sleep: Asynchronous threads for suspend_noirq) Reported-by:
Jeffy Chen <jeffy.chen@rock-chips.com> Signed-off-by:
Brian Norris <briannorris@chromium.org> Signed-off-by:
Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by:
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Johan Hovold authored
commit ceb75787 upstream. Make sure to drop the reference taken by class_find_device() after opening the RTC device. Fixes: 77437fd4 (pm: boot time suspend selftest) Signed-off-by:
Johan Hovold <johan@kernel.org> Signed-off-by:
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Johan Hovold authored
commit d6124b40 upstream. This subsystem consistently fails to drop the device reference taken by class_find_device(). Note that some of these lookup functions already take a reference to the returned data, while others claim no reference is needed (or does not seem need one). Fixes: 183b9b59 ("uwb: add the UWB stack (core files)") Signed-off-by:
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Johan Hovold authored
commit 722f1910 upstream. Make sure to drop the reference taken by bus_find_device_by_name() before returning from mfd_clone_cell(). Fixes: a9bbba99 ("mfd: add platform_device sharing support for mfd") Signed-off-by:
Lee Jones <lee.jones@linaro.org> Signed-off-by:
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Luca Coelho authored
commit e0d9727c upstream. The SPLC data parsing is too restrictive and was not trying find the correct element for WiFi. This causes problems with some BIOSes where the SPLC method exists, but doesn't have a WiFi entry on the first element of the list. The domain type values are also incorrect according to the specification. Fix this by complying with the actual specification. Additionally, replace all occurrences of SPLX to SPLC, since SPLX is only a structure internal to the ACPI tables, and may not even exist. Fixes: bcb079a1 ("iwlwifi: pcie: retrieve and parse ACPI power limitations") Reported-by:
Chris Rorvick <chris@rorvick.com> Tested-by:
Paul Bolle <pebolle@tiscali.nl> Tested-by:
Luca Coelho <luciano.coelho@intel.com> Signed-off-by:
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Lokesh Vutla authored
commit 3984903a upstream. RTC can be clocked from an external 32KHz oscillator, or from the Peripheral PLL. The RTC has an internal oscillator buffer to support direct operation with a crystal. ---------------------------------------- | Device --------- | | | | | | | RTCSS | | | --------- | | | OSC |<------| RTC | | | | |------>| OSC |--- | | | | -------- | | | | | ----|clk | | | -------- | | | | | | PRCM |--- | | | | -------- -------- | ---------------------------------------- The RTC functional clock is sourced by default from the clock derived from the Peripheral PLL. In order to select source as external osc clk the following changes needs to be done: - Enable the RTC OSC (RTC_OSC_REG[4]OSC32K_GZ = 0) - Enable the clock mux(RTC_OSC_REG[6]K32CLK_EN = 1) - Select the external clock source (RTC_OSC_REG[3]32KCLK_SEL = 1) Fixes: 399cf0f6 ("rtc: omap: Add external clock enabling support") Signed-off-by:
Keerthy <j-keerthy@ti.com> Signed-off-by:
Lokesh Vutla <lokeshvutla@ti.com> Signed-off-by:
Dave Gerlach <d-gerlach@ti.com> Signed-off-by:
Alexandre Belloni <alexandre.belloni@free-electrons.com> Signed-off-by:
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Wei Yongjun authored
commit a29e52a6 upstream. Fix the retrn value check which testing the wrong variable in mmp2_clk_init(). Fixes: 1ec770d9 ("clk: mmp: add mmp2 DT support for clock driver") Signed-off-by:
Wei Yongjun <weiyongjun1@huawei.com> Signed-off-by:
Stephen Boyd <sboyd@codeaurora.org> Signed-off-by:
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Wei Yongjun authored
commit deab0726 upstream. Fix the retrn value check which testing the wrong variable in pxa168_clk_init(). Fixes: ab08aefc ("clk: mmp: add pxa168 DT support for clock driver") Signed-off-by:
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Wei Yongjun authored
commit 10f2bfb0 upstream. Fix the retrn value check which testing the wrong variable in pxa910_clk_init(). Fixes: 2bc61da9 ("clk: mmp: add pxa910 DT support for clock driver") Signed-off-by:
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Mario Kleiner authored
commit 8e94a46c upstream. External clients which import our bo's wait only for exclusive dmabuf-fences, not on shared ones, ditto for bo's which we import from external providers and write to. Therefore attach exclusive fences on prime shared buffers if our exported buffer gets imported by an external client, or if we import a buffer from an external exporter. See discussion in thread: https://lists.freedesktop.org/archives/dri-devel/2016-October/122370.html Prime export tested on Intel iGPU + AMD Tonga dGPU as DRI3/Present Prime render offload, and with the Tonga standalone as primary gpu. v2: Add a wait for all shared fences before prime export, as suggested by Christian Koenig. v3: - Mark buffer prime_exported in amdgpu_gem_prime_pin, so we only use the exclusive fence when exporting a bo to external clients like a separate iGPU, but not when exporting/importing from/to ourselves as part of regular DRI3 fd passing. - Propagate failure of reservation_object_wait_rcu back to caller. v4: - Switch to a prime_shared_count counter instead of a flag, which gets in/decremented on prime_pin/unpin, so we can switch back to shared fences if all clients detach from our exported bo. - Also switch to exclusive fence for prime imported bo's. v5: - Drop lret, instead use int ret -> long ret, as proposed by Christian. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=95472 Tested-by: Mike Lothian <mike@fireburn.co.uk> (v1) Signed-off-by:
Mario Kleiner <mario.kleiner.de@gmail.com> Reviewed-by: Christian König <christian.koenig@amd.com>. Cc: Christian König <christian.koenig@amd.com> Cc: Michel Dänzer <michel.daenzer@amd.com> Signed-off-by:
Alex Deucher <alexander.deucher@amd.com> Signed-off-by:
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Sven Ebenfeld authored
commit 83d2c9a9 upstream. When using AES-XTS on a Wandboard, we receive a Mode error: caam_jr 2102000.jr1: 20001311: CCB: desc idx 19: AES: Mode error. According to the Security Reference Manual, the Low Power AES units of the i.MX6 do not support the XTS mode. Therefore we must not register XTS implementations in the Crypto API. Signed-off-by:
Sven Ebenfeld <sven.ebenfeld@gmail.com> Reviewed-by:
Horia Geantă <horia.geanta@nxp.com> Signed-off-by:
Herbert Xu <herbert@gondor.apana.org.au>
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Theodore Ts'o authored
commit 8cdf3372 upstream. If the block size or cluster size is insane, reject the mount. This is important for security reasons (although we shouldn't be just depending on this check). Ref: http://www.securityfocus.com/archive/1/539661 Ref: https://bugzilla.redhat.com/show_bug.cgi?id=1332506Reported-by:
Borislav Petkov <bp@alien8.de> Reported-by:
Nikolay Borisov <kernel@kyup.com> Signed-off-by:
Theodore Ts'o <tytso@mit.edu> Signed-off-by:
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Borislav Petkov authored
commit c6a38553 upstream. So Sebastian turned off the PIE for kernel builds but that was too late - Kbuild.include already uses KBUILD_CFLAGS and trying to disable gcc options with, say cc-disable-warning, fails: gcc -D__KERNEL__ -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs ... -Wno-sign-compare -fno-asynchronous-unwind-tables -Wframe-address -c -x c /dev/null -o .31392.tmp /dev/null:1:0: error: code model kernel does not support PIC mode because that returns an error and we can't disable the warning. For example in this case: KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) which leads to gcc issuing all those warnings again. So let's turn off PIE/PIC at the earliest possible moment, when we declare KBUILD_CFLAGS so that cc-disable-warning picks it up too. Also, we need the $(call cc-option ...) because -fno-PIE is supported since gcc v3.4 and our lowest supported gcc version is 3.2 right now. Signed-off-by:
Borislav Petkov <bp@suse.de> Cc: Ben Hutchings <ben@decadent.org.uk> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by:
Michal Marek <mmarek@suse.com> Signed-off-by:
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Sebastian Andrzej Siewior authored
commit 90944e40 upstream. If the gcc is configured to do -fPIE by default then the build aborts later with: | Unsupported relocation type: unknown type rel type name (29) Tagging it stable so it is possible to compile recent stable kernels as well. Signed-off-by:
Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by:
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Sebastian Andrzej Siewior authored
commit 82031ea2 upstream. Adding -no-PIE to the fstack protector check. -no-PIE was introduced before -fstack-protector so there is no need for a runtime check. Without it the build stops: |Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: -fstack-protector-strong available but compiler is broken due to -mcmodel=kernel + -fPIE if -fPIE is enabled by default. Tagging it stable so it is possible to compile recent stable kernels as well. Signed-off-by:
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Sebastian Andrzej Siewior authored
commit 8ae94224 upstream. Debian started to build the gcc with -fPIE by default so the kernel build ends before it starts properly with: |kernel/bounds.c:1:0: error: code model kernel does not support PIC mode Also add to KBUILD_AFLAGS due to: |gcc -Wp,-MD,arch/x86/entry/vdso/vdso32/.note.o.d … -mfentry -DCC_USING_FENTRY … vdso/vdso32/note.S |arch/x86/entry/vdso/vdso32/note.S:1:0: sorry, unimplemented: -mfentry isn’t supported for 32-bit in combination with -fpic Tagging it stable so it is possible to compile recent stable kernels as well. Signed-off-by:
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Linus Walleij authored
commit 93d710a6 upstream. We get the following build error from UM Linux after adding an entry to drivers/iio/gyro/Kconfig that issues "select I2C_MUX": ERROR: "devm_ioremap_resource" [drivers/i2c/muxes/i2c-mux-reg.ko] undefined! ERROR: "of_address_to_resource" [drivers/i2c/muxes/i2c-mux-reg.ko] undefined! It appears that the I2C mux core code depends on HAS_IOMEM for historical reasons, while CONFIG_I2C_MUX_REG does *not* have a direct dependency on HAS_IOMEM. This creates a situation where a allyesconfig or allmodconfig for UM Linux will select I2C_MUX, and will implicitly enable I2C_MUX_REG as well, and the compilation will fail for the register driver. Fix this up by making I2C_MUX_REG depend on HAS_IOMEM and removing the dependency from I2C_MUX. Reported-by:
kbuild test robot <fengguang.wu@intel.com> Reported-by:
Jonathan Cameron <jic23@jic23.retrosnub.co.uk> Signed-off-by:
Linus Walleij <linus.walleij@linaro.org> Acked-by:
Jonathan Cameron <jic23@kernel.org> Acked-by:
Peter Rosin <peda@axentia.se> Signed-off-by:
Wolfram Sang <wsa@the-dreams.de> Signed-off-by:
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Oliver Hartkopp authored
commit deb507f9 upstream. Andrey Konovalov reported an issue with proc_register in bcm.c. As suggested by Cong Wang this patch adds a lock_sock() protection and a check for unsuccessful proc_create_data() in bcm_connect(). Reference: http://marc.info/?l=linux-netdev&m=147732648731237Reported-by:
Andrey Konovalov <andreyknvl@google.com> Suggested-by:
Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by:
Oliver Hartkopp <socketcan@hartkopp.net> Acked-by:
Marc Kleine-Budde <mkl@pengutronix.de> Signed-off-by:
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Azhar Shaikh authored
commit 274e43ed upstream. Commit 41a3da2b ("mfd: intel-lpss: Save register context on suspend") saved the register context while going to suspend and also put the device in reset state. Due to the resetting of device, system cannot enter S3/S0ix states when no_console_suspend flag is enabled. The system and serial console both hang. The resetting of device is not needed while going to suspend. Hence remove this code. Fixes: 41a3da2b ("mfd: intel-lpss: Save register context on suspend") Signed-off-by:
Azhar Shaikh <azhar.shaikh@intel.com> Acked-by:
Mika Westerberg <mika.westerberg@linux.intel.com> Reviewed-by:
Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by:
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Miklos Szeredi authored
commit 59c3b76c upstream. If pos is at the beginning of a page and copied is zero then page is not zeroed but is marked uptodate. Fix by skipping everything except unlock/put of page if zero bytes were copied. Reported-by:
Al Viro <viro@zeniv.linux.org.uk> Fixes: 6b12c1b3 ("fuse: Implement write_begin/write_end callbacks") Signed-off-by:
Miklos Szeredi <mszeredi@redhat.com> Signed-off-by:
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Ignacio Alvarado authored
commit 1650b4eb upstream. Function user_notifier_unregister should be called only once for each registered user notifier. Function kvm_arch_hardware_disable can be executed from an IPI context which could cause a race condition with a VCPU returning to user mode and attempting to unregister the notifier. Signed-off-by:
Ignacio Alvarado <ikalvarado@google.com> Fixes: 18863bdd ("KVM: x86 shared msr infrastructure") Reviewed-by:
Paolo Bonzini <pbonzini@redhat.com> Signed-off-by:
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Paolo Bonzini authored
commit 7301d6ab upstream. Reported by syzkaller: [ INFO: suspicious RCU usage. ] 4.9.0-rc4+ #47 Not tainted ------------------------------- ./include/linux/kvm_host.h:536 suspicious rcu_dereference_check() usage! stack backtrace: CPU: 1 PID: 6679 Comm: syz-executor Not tainted 4.9.0-rc4+ #47 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 ffff880039e2f6d0 ffffffff81c2e46b ffff88003e3a5b40 0000000000000000 0000000000000001 ffffffff83215600 ffff880039e2f700 ffffffff81334ea9 ffffc9000730b000 0000000000000004 ffff88003c4f8420 ffff88003d3f8000 Call Trace: [< inline >] __dump_stack lib/dump_stack.c:15 [<ffffffff81c2e46b>] dump_stack+0xb3/0x118 lib/dump_stack.c:51 [<ffffffff81334ea9>] lockdep_rcu_suspicious+0x139/0x180 kernel/locking/lockdep.c:4445 [< inline >] __kvm_memslots include/linux/kvm_host.h:534 [< inline >] kvm_memslots include/linux/kvm_host.h:541 [<ffffffff8105d6ae>] kvm_gfn_to_hva_cache_init+0xa1e/0xce0 virt/kvm/kvm_main.c:1941 [<ffffffff8112685d>] kvm_lapic_set_vapic_addr+0xed/0x140 arch/x86/kvm/lapic.c:2217 Reported-by:
David Hildenbrand <david@redhat.com> Signed-off-by:
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Yazen Ghannam authored
commit b0b6e868 upstream. cpu_llc_id (Last Level Cache ID) derivation on AMD Fam17h has an underflow bug when extracting the socket_id value. It starts from 0 so subtracting 1 from it will result in an invalid value. This breaks scheduling topology later on since the cpu_llc_id will be incorrect. For example, the the cpu_llc_id of the *other* CPU in the loops in set_cpu_sibling_map() underflows and we're generating the funniest thread_siblings masks and then when I run 8 threads of nbench, they get spread around the LLC domains in a very strange pattern which doesn't give you the normal scheduling spread one would expect for performance. Other things like EDAC use cpu_llc_id so they will be b0rked too. So, the APIC ID is preset in APICx020 for bits 3 and above: they contain the core complex, node and socket IDs. The LLC is at the core complex level so we can find a unique cpu_llc_id by right shifting the APICID by 3 because then the least significant bit will be the Core Complex ID. Tested-by:
Yazen Ghannam <Yazen.Ghannam@amd.com> [ Cleaned up and extended the commit message. ] Signed-off-by:
Thomas Gleixner <tglx@linutronix.de> Cc: Aravind Gopalakrishnan <aravindksg.lkml@gmail.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Fixes: 3849e91f ("x86/AMD: Fix last level cache topology for AMD Fam17h systems") Link: http://lkml.kernel.org/r/20161108083506.rvqb5h4chrcptj7d@pd.tnicSigned-off-by:
Ingo Molnar <mingo@kernel.org> Signed-off-by:
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- 21 Nov, 2016 5 commits
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Greg Kroah-Hartman authored
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David S. Miller authored
[ Upstream commit 0fd0ff01 ] Now that all of the user copy routines are converted to return accurate residual lengths when an exception occurs, we no longer need the broken fixup routines. Signed-off-by:
David S. Miller <davem@davemloft.net> Signed-off-by:
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David S. Miller authored
[ Upstream commit 614da3d9 ] All of __ret{,l}_mone{_asi,_fp,_asi_fpu} are now unused. Signed-off-by:
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David S. Miller authored
[ Upstream commit ee841d0a ] Report the exact number of bytes which have not been successfully copied when an exception occurs, using the running remaining length. Signed-off-by:
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David S. Miller authored
[ Upstream commit e93704e4 ] Report the exact number of bytes which have not been successfully copied when an exception occurs, using the running remaining length. Signed-off-by:
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