Pull x86 fix from Thomas Gleixner:
"A single fix, which addresses boot failures on machines which do not
report EBDA correctly, which can place the trampoline into reserved
memory regions. Validating against E820 prevents that"
* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/boot/compressed/64: Validate trampoline placement against E820
Pull perf fixes from Thomas Gleixner:
"A set of fixes for perf:
Kernel side:
- Fix the hardcoded index of extra PCI devices on Broadwell which
caused a resource conflict and triggered warnings on CPU hotplug.
Tooling:
- Update the tools copy of several files, including perf_event.h,
powerpc's asm/unistd.h (new io_pgetevents syscall), bpf.h and x86's
memcpy_64.s (used in 'perf bench mem'), silencing the respective
warnings during the perf tools build.
- Fix the build on the alpine:edge distro"
* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
perf/x86/intel/uncore: Fix hardcoded index of Broadwell extra PCI devices
perf tools: Fix the build on the alpine:edge distro
tools arch: Update arch/x86/lib/memcpy_64.S copy used in 'perf bench mem memcpy'
tools headers uapi: Refresh linux/bpf.h copy
tools headers powerpc: Update asm/unistd.h copy to pick new
tools headers uapi: Update tools's copy of linux/perf_event.h
There were two report of boot failure cased by trampoline placed into
a reserved memory region. It can happen on machines that don't report
EBDA correctly.
Fix the problem by re-validating the found address against the E820 table.
If the address is in a reserved area, find the next usable region below the
initial address.
Fixes: 3548e131ec ("x86/boot/compressed/64: Find a place for 32-bit trampoline")
Reported-by: Dmitry Malkin <d.malkin@real-time-systems.com>
Reported-by: youling 257 <youling257@gmail.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Link: https://lkml.kernel.org/r/20180801133225.38121-1-kirill.shutemov@linux.intel.com
Masayoshi Mizuma reported that a warning message is shown while a CPU is
hot-removed on Broadwell servers:
WARNING: CPU: 126 PID: 6 at arch/x86/events/intel/uncore.c:988
uncore_pci_remove+0x10b/0x150
Call Trace:
pci_device_remove+0x42/0xd0
device_release_driver_internal+0x148/0x220
pci_stop_bus_device+0x76/0xa0
pci_stop_root_bus+0x44/0x60
acpi_pci_root_remove+0x1f/0x80
acpi_bus_trim+0x57/0x90
acpi_bus_trim+0x2e/0x90
acpi_device_hotplug+0x2bc/0x4b0
acpi_hotplug_work_fn+0x1a/0x30
process_one_work+0x174/0x3a0
worker_thread+0x4c/0x3d0
kthread+0xf8/0x130
This bug was introduced by:
commit 15a3e845b0 ("perf/x86/intel/uncore: Fix SBOX support for Broadwell CPUs")
The index of "QPI Port 2 filter" was hardcode to 2, but this conflicts with the
index of "PCU.3" which is "HSWEP_PCI_PCU_3", which equals to 2 as well.
To fix the conflict, the hardcoded index needs to be cleaned up:
- introduce a new enumerator "BDX_PCI_QPI_PORT2_FILTER" for "QPI Port 2
filter" on Broadwell,
- increase UNCORE_EXTRA_PCI_DEV_MAX by one,
- clean up the hardcoded index.
Debugged-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>
Suggested-by: Ingo Molnar <mingo@kernel.org>
Reported-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>
Tested-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: msys.mizuma@gmail.com
Cc: stable@vger.kernel.org
Fixes: 15a3e845b0 ("perf/x86/intel/uncore: Fix SBOX support for Broadwell CPUs")
Link: http://lkml.kernel.org/r/1532953688-15008-1-git-send-email-kan.liang@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Pull networking fixes from David Miller:
"Several smallish fixes, I don't think any of this requires another -rc
but I'll leave that up to you:
1) Don't leak uninitialzed bytes to userspace in xfrm_user, from Eric
Dumazet.
2) Route leak in xfrm_lookup_route(), from Tommi Rantala.
3) Premature poll() returns in AF_XDP, from Björn Töpel.
4) devlink leak in netdevsim, from Jakub Kicinski.
5) Don't BUG_ON in fib_compute_spec_dst, the condition can
legitimately happen. From Lorenzo Bianconi.
6) Fix some spectre v1 gadgets in generic socket code, from Jeremy
Cline.
7) Don't allow user to bind to out of range multicast groups, from
Dmitry Safonov with a follow-up by Dmitry Safonov.
8) Fix metrics leak in fib6_drop_pcpu_from(), from Sabrina Dubroca"
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (41 commits)
netlink: Don't shift with UB on nlk->ngroups
net/ipv6: fix metrics leak
xen-netfront: wait xenbus state change when load module manually
can: ems_usb: Fix memory leak on ems_usb_disconnect()
openvswitch: meter: Fix setting meter id for new entries
netlink: Do not subscribe to non-existent groups
NET: stmmac: align DMA stuff to largest cache line length
tcp_bbr: fix bw probing to raise in-flight data for very small BDPs
net: socket: Fix potential spectre v1 gadget in sock_is_registered
net: socket: fix potential spectre v1 gadget in socketcall
net: mdio-mux: bcm-iproc: fix wrong getter and setter pair
ipv4: remove BUG_ON() from fib_compute_spec_dst
enic: handle mtu change for vf properly
net: lan78xx: fix rx handling before first packet is send
nfp: flower: fix port metadata conversion bug
bpf: use GFP_ATOMIC instead of GFP_KERNEL in bpf_parse_prog()
bpf: fix bpf_skb_load_bytes_relative pkt length check
perf build: Build error in libbpf missing initialization
net: ena: Fix use of uninitialized DMA address bits field
bpf: btf: Use exact btf value_size match in map_check_btf()
...
Pull locking fixes from Ingo Molnar:
"A paravirt UP-patching fix, and an I2C MUX driver lockdep warning fix"
* 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
locking/pvqspinlock/x86: Use LOCK_PREFIX in __pv_queued_spin_unlock() assembly code
i2c/mux, locking/core: Annotate the nested rt_mutex usage
locking/rtmutex: Allow specifying a subclass for nested locking
Pull EFI fix from Ingo Molnar:
"An UEFI variables fix for SEV guests"
* 'efi-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/efi: Access EFI MMIO data as unencrypted when SEV is active
Daniel Borkmann says:
====================
pull-request: bpf 2018-07-28
The following pull-request contains BPF updates for your *net* tree.
The main changes are:
1) API fixes for libbpf's BTF mapping of map key/value types in order
to make them compatible with iproute2's BPF_ANNOTATE_KV_PAIR()
markings, from Martin.
2) Fix AF_XDP to not report POLLIN prematurely by using the non-cached
consumer pointer of the RX queue, from Björn.
3) Fix __xdp_return() to check for NULL pointer after the rhashtable
lookup that retrieves the allocator object, from Taehee.
4) Fix x86-32 JIT to adjust ebp register in prologue and epilogue
by 4 bytes which got removed from overall stack usage, from Wang.
5) Fix bpf_skb_load_bytes_relative() length check to use actual
packet length, from Daniel.
6) Fix uninitialized return code in libbpf bpf_perf_event_read_simple()
handler, from Thomas.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
The size of kvm's shadow page tables corresponds to the size of the
guest virtual machines on the system. Large VMs can spend a significant
amount of memory as shadow page tables which can not be left as system
memory overhead. So, account shadow page tables to the kmemcg.
[shakeelb@google.com: replace (GFP_KERNEL|__GFP_ACCOUNT) with GFP_KERNEL_ACCOUNT]
Link: http://lkml.kernel.org/r/20180629140224.205849-1-shakeelb@google.com
Link: http://lkml.kernel.org/r/20180627181349.149778-1-shakeelb@google.com
Signed-off-by: Shakeel Butt <shakeelb@google.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Peter Feiner <pfeiner@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Make sure to initialize all VMAs properly, not only those which come
from vm_area_cachep.
Link: http://lkml.kernel.org/r/20180724121139.62570-3-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Commit 24dea04767 ("bpf, x32: remove ld_abs/ld_ind")
removed the 4 /* Extra space for skb_copy_bits buffer */
from _STACK_SIZE, but it didn't fix the concerned code
in emit_prologue and emit_epilogue, and this error will
bring very strange kernel runtime errors. This patch
fixes it.
Fixes: 24dea04767 ("bpf, x32: remove ld_abs/ld_ind")
Reported-by: Meelis Roos <mroos@linux.ee>
Bisected-by: Meelis Roos <mroos@linux.ee>
Signed-off-by: Wang YanQing <udknight@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Dirk Gouders reported that two consecutive "make" invocations on an
already compiled tree will show alternating behaviors:
$ make
CALL scripts/checksyscalls.sh
DESCEND objtool
CHK include/generated/compile.h
DATAREL arch/x86/boot/compressed/vmlinux
Kernel: arch/x86/boot/bzImage is ready (#48)
Building modules, stage 2.
MODPOST 165 modules
$ make
CALL scripts/checksyscalls.sh
DESCEND objtool
CHK include/generated/compile.h
LD arch/x86/boot/compressed/vmlinux
ZOFFSET arch/x86/boot/zoffset.h
AS arch/x86/boot/header.o
LD arch/x86/boot/setup.elf
OBJCOPY arch/x86/boot/setup.bin
OBJCOPY arch/x86/boot/vmlinux.bin
BUILD arch/x86/boot/bzImage
Setup is 15644 bytes (padded to 15872 bytes).
System is 6663 kB
CRC 3eb90f40
Kernel: arch/x86/boot/bzImage is ready (#48)
Building modules, stage 2.
MODPOST 165 modules
He bisected it back to:
commit 98f7852537 ("x86/boot: Refuse to build with data relocations")
The root cause was the use of the "if_changed" kbuild function multiple
times for the same target. It was designed to only be used once per
target, otherwise it will effectively always trigger, flipping back and
forth between the two commands getting recorded by "if_changed". Instead,
this patch merges the two commands into a single function to get stable
build artifacts (i.e. .vmlinux.cmd), and a single build behavior.
Bisected-and-Reported-by: Dirk Gouders <dirk@gouders.net>
Fix-Suggested-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20180724230827.GA37823@beast
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Vince reported the perf_fuzzer giving various unwinder warnings and
Josh reported:
> Deja vu. Most of these are related to perf PEBS, similar to the
> following issue:
>
> b8000586c9 ("perf/x86/intel: Cure bogus unwind from PEBS entries")
>
> This is basically the ORC version of that. setup_pebs_sample_data() is
> assembling a franken-pt_regs which ORC isn't happy about. RIP is
> inconsistent with some of the other registers (like RSP and RBP).
And where the previous unwinder only needed BP,SP ORC also requires
IP. But we cannot spoof IP because then the sample will get displaced,
entirely negating the point of PEBS.
So cure the whole thing differently by doing the unwind early; this
does however require a means to communicate we did the unwind early.
We (ab)use an unused sample_type bit for this, which we set on events
that fill out the data->callchain before the normal
perf_prepare_sample().
Debugged-by: Josh Poimboeuf <jpoimboe@redhat.com>
Reported-by: Vince Weaver <vincent.weaver@maine.edu>
Tested-by: Josh Poimboeuf <jpoimboe@redhat.com>
Tested-by: Prashant Bhole <bhole_prashant_q7@lab.ntt.co.jp>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
The LOCK_PREFIX macro should be used in the __raw_callee_save___pv_queued_spin_unlock()
assembly code, so that the lock prefix can be patched out on UP systems.
Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Joe Mario <jmario@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will.deacon@arm.com>
Link: http://lkml.kernel.org/r/1531858560-21547-1-git-send-email-longman@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
error_entry and error_exit communicate the user vs. kernel status of
the frame using %ebx. This is unnecessary -- the information is in
regs->cs. Just use regs->cs.
This makes error_entry simpler and makes error_exit more robust.
It also fixes a nasty bug. Before all the Spectre nonsense, the
xen_failsafe_callback entry point returned like this:
ALLOC_PT_GPREGS_ON_STACK
SAVE_C_REGS
SAVE_EXTRA_REGS
ENCODE_FRAME_POINTER
jmp error_exit
And it did not go through error_entry. This was bogus: RBX
contained garbage, and error_exit expected a flag in RBX.
Fortunately, it generally contained *nonzero* garbage, so the
correct code path was used. As part of the Spectre fixes, code was
added to clear RBX to mitigate certain speculation attacks. Now,
depending on kernel configuration, RBX got zeroed and, when running
some Wine workloads, the kernel crashes. This was introduced by:
commit 3ac6d8c787 ("x86/entry/64: Clear registers for exceptions/interrupts, to reduce speculation attack surface")
With this patch applied, RBX is no longer needed as a flag, and the
problem goes away.
I suspect that malicious userspace could use this bug to crash the
kernel even without the offending patch applied, though.
[ Historical note: I wrote this patch as a cleanup before I was aware
of the bug it fixed. ]
[ Note to stable maintainers: this should probably get applied to all
kernels. If you're nervous about that, a more conservative fix to
add xorl %ebx,%ebx; incl %ebx before the jump to error_exit should
also fix the problem. ]
Reported-and-tested-by: M. Vefa Bicakci <m.v.b@runbox.com>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Dominik Brodowski <linux@dominikbrodowski.net>
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Cc: xen-devel@lists.xenproject.org
Fixes: 3ac6d8c787 ("x86/entry/64: Clear registers for exceptions/interrupts, to reduce speculation attack surface")
Link: http://lkml.kernel.org/r/b5010a090d3586b2d6e06c7ad3ec5542d1241c45.1532282627.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
All SKX with stepping higher than 4 support the TSC_DEADLINE,
no matter the microcode version.
Without this patch, upcoming SKX steppings will not be able to use
their TSC_DEADLINE timer.
Signed-off-by: Len Brown <len.brown@intel.com>
Cc: <stable@kernel.org> # v4.14+
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: 616dd5872e ("x86/apic: Update TSC_DEADLINE quirk with additional SKX stepping")
Link: http://lkml.kernel.org/r/d0c7129e509660be9ec6b233284b8d42d90659e8.1532207856.git.len.brown@intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
SEV guest fails to update the UEFI runtime variables stored in the
flash.
The following commit:
1379edd596 ("x86/efi: Access EFI data as encrypted when SEV is active")
unconditionally maps all the UEFI runtime data as 'encrypted' (C=1).
When SEV is active the UEFI runtime data marked as EFI_MEMORY_MAPPED_IO
should be mapped as 'unencrypted' so that both guest and hypervisor can
access the data.
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Cc: <stable@vger.kernel.org> # 4.15.x
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org
Fixes: 1379edd596 ("x86/efi: Access EFI data as encrypted ...")
Link: http://lkml.kernel.org/r/20180720012846.23560-2-ard.biesheuvel@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Pull x86 fix from Ingo Molnar:
"A single fix for a MCE-polling regression, which prevented the
disabling of polling"
* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/MCE: Remove min interval polling limitation
Pull x86 pti fixes from Ingo Molnar:
"An APM fix, and a BTS hardware-tracing fix related to PTI changes"
* 'x86-pti-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/apm: Don't access __preempt_count with zeroed fs
x86/events/intel/ds: Fix bts_interrupt_threshold alignment
Pull core kernel fixes from Ingo Molnar:
"This is mostly the copy_to_user_mcsafe() related fixes from Dan
Williams, and an ORC fix for Clang"
* 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/asm/memcpy_mcsafe: Fix copy_to_user_mcsafe() exception handling
lib/iov_iter: Fix pipe handling in _copy_to_iter_mcsafe()
lib/iov_iter: Document _copy_to_iter_flushcache()
lib/iov_iter: Document _copy_to_iter_mcsafe()
objtool: Use '.strtab' if '.shstrtab' doesn't exist, to support ORC tables on Clang
VPID for the nested vcpu is allocated at vmx_create_vcpu whenever nested
vmx is turned on with the module parameter.
However, it's only freed if the L1 guest has executed VMXON which is not
a given.
As a result, on a system with nested==on every creation+deletion of an
L1 vcpu without running an L2 guest results in leaking one vpid. Since
the total number of vpids is limited to 64k, they can eventually get
exhausted, preventing L2 from starting.
Delay allocation of the L2 vpid until VMXON emulation, thus matching its
freeing.
Fixes: 5c614b3583
Cc: stable@vger.kernel.org
Signed-off-by: Roman Kagan <rkagan@virtuozzo.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Do not expose the address of vmx->nested.current_vmptr to
kvm_write_guest_virt_system() as the resulting __copy_to_user()
call will trigger a WARN when CONFIG_HARDENED_USERCOPY is
enabled.
Opportunistically clean up variable names in handle_vmptrst()
to improve readability, e.g. vmcs_gva is misleading as the
memory operand of VMPTRST is plain memory, not a VMCS.
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Tested-by: Peter Shier <pshier@google.com>
Reviewed-by: Peter Shier <pshier@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Pull kvm fixes from Paolo Bonzini:
"Miscellaneous bugfixes, plus a small patchlet related to Spectre v2"
* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
kvmclock: fix TSC calibration for nested guests
KVM: VMX: Mark VMXArea with revision_id of physical CPU even when eVMCS enabled
KVM: irqfd: fix race between EPOLLHUP and irq_bypass_register_consumer
KVM/Eventfd: Avoid crash when assign and deassign specific eventfd in parallel.
x86/kvmclock: set pvti_cpu0_va after enabling kvmclock
x86/kvm/Kconfig: Ensure CRYPTO_DEV_CCP_DD state at minimum matches KVM_AMD
kvm: nVMX: Restore exit qual for VM-entry failure due to MSR loading
x86/kvm/vmx: don't read current->thread.{fs,gs}base of legacy tasks
KVM: VMX: support MSR_IA32_ARCH_CAPABILITIES as a feature MSR
Inside a nested guest, access to hardware can be slow enough that
tsc_read_refs always return ULLONG_MAX, causing tsc_refine_calibration_work
to be called periodically and the nested guest to spend a lot of time
reading the ACPI timer.
However, if the TSC frequency is available from the pvclock page,
we can just set X86_FEATURE_TSC_KNOWN_FREQ and avoid the recalibration.
'refine' operation.
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Peng Hao <peng.hao2@zte.com.cn>
[Commit message rewritten. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
When eVMCS is enabled, all VMCS allocated to be used by KVM are marked
with revision_id of KVM_EVMCS_VERSION instead of revision_id reported
by MSR_IA32_VMX_BASIC.
However, even though not explictly documented by TLFS, VMXArea passed
as VMXON argument should still be marked with revision_id reported by
physical CPU.
This issue was found by the following setup:
* L0 = KVM which expose eVMCS to it's L1 guest.
* L1 = KVM which consume eVMCS reported by L0.
This setup caused the following to occur:
1) L1 execute hardware_enable().
2) hardware_enable() calls kvm_cpu_vmxon() to execute VMXON.
3) L0 intercept L1 VMXON and execute handle_vmon() which notes
vmxarea->revision_id != VMCS12_REVISION and therefore fails with
nested_vmx_failInvalid() which sets RFLAGS.CF.
4) L1 kvm_cpu_vmxon() don't check RFLAGS.CF for failure and therefore
hardware_enable() continues as usual.
5) L1 hardware_enable() then calls ept_sync_global() which executes
INVEPT.
6) L0 intercept INVEPT and execute handle_invept() which notes
!vmx->nested.vmxon and thus raise a #UD to L1.
7) Raised #UD caused L1 to panic.
Reviewed-by: Krish Sadhukhan <krish.sadhukhan@oracle.com>
Cc: stable@vger.kernel.org
Fixes: 773e8a0425
Signed-off-by: Liran Alon <liran.alon@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
commit b3b7c4795c ("x86/MCE: Serialize sysfs changes") introduced a min
interval limitation when setting the check interval for polled MCEs.
However, the logic is that 0 disables polling for corrected MCEs, see
Documentation/x86/x86_64/machinecheck. The limitation prevents disabling.
Remove this limitation and allow the value 0 to disable polling again.
Fixes: b3b7c4795c ("x86/MCE: Serialize sysfs changes")
Signed-off-by: Dewet Thibaut <thibaut.dewet@nokia.com>
Signed-off-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
[ Massage commit message. ]
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/20180716084927.24869-1-alexander.sverdlin@nokia.com
All copy_to_user() implementations need to be prepared to handle faults
accessing userspace. The __memcpy_mcsafe() implementation handles both
mmu-faults on the user destination and machine-check-exceptions on the
source buffer. However, the memcpy_mcsafe() wrapper may silently
fallback to memcpy() depending on build options and cpu-capabilities.
Force copy_to_user_mcsafe() to always use __memcpy_mcsafe() when
available, and otherwise disable all of the copy_to_user_mcsafe()
infrastructure when __memcpy_mcsafe() is not available, i.e.
CONFIG_X86_MCE=n.
This fixes crashes of the form:
run fstests generic/323 at 2018-07-02 12:46:23
BUG: unable to handle kernel paging request at 00007f0d50001000
RIP: 0010:__memcpy+0x12/0x20
[..]
Call Trace:
copyout_mcsafe+0x3a/0x50
_copy_to_iter_mcsafe+0xa1/0x4a0
? dax_alive+0x30/0x50
dax_iomap_actor+0x1f9/0x280
? dax_iomap_rw+0x100/0x100
iomap_apply+0xba/0x130
? dax_iomap_rw+0x100/0x100
dax_iomap_rw+0x95/0x100
? dax_iomap_rw+0x100/0x100
xfs_file_dax_read+0x7b/0x1d0 [xfs]
xfs_file_read_iter+0xa7/0xc0 [xfs]
aio_read+0x11c/0x1a0
Reported-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Tested-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Fixes: 8780356ef6 ("x86/asm/memcpy_mcsafe: Define copy_to_iter_mcsafe()")
Link: http://lkml.kernel.org/r/153108277790.37979.1486841789275803399.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
pvti_cpu0_va is the address of shared kvmclock data structure.
pvti_cpu0_va is currently kept unset (1) on 32 bit systems, (2) when
kvmclock vsyscall is disabled, and (3) if kvmclock is not stable.
This poses a problem, because kvm_ptp needs pvti_cpu0_va, but (1) can
work on 32 bit, (2) has little relation to the vsyscall, and (3) does
not need stable kvmclock (although kvmclock won't be used for system
clock if it's not stable, so kvm_ptp is pointless in that case).
Expose pvti_cpu0_va whenever kvmclock is enabled to allow all users to
work with it.
This fixes a regression found on Gentoo: https://bugs.gentoo.org/658544.
Fixes: 9f08890ab9 ("x86/pvclock: add setter for pvclock_pvti_cpu0_va")
Cc: stable@vger.kernel.org
Reported-by: Andreas Steinmetz <ast@domdv.de>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Prevent a config where KVM_AMD=y and CRYPTO_DEV_CCP_DD=m thereby ensuring
that AMD Secure Processor device driver will be built-in when KVM_AMD is
also built-in.
v1->v2:
* Removed usage of 'imply' Kconfig option.
* Change patch commit message.
Fixes: 505c9e94d8 ("KVM: x86: prefer "depends on" to "select" for SEV")
Cc: <stable@vger.kernel.org> # 4.16.x
Signed-off-by: Janakarajan Natarajan <Janakarajan.Natarajan@amd.com>
Reviewed-by: Brijesh Singh <brijesh.singh@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This exit qualification was inadvertently dropped when the two
VM-entry failure blocks were coalesced.
Fixes: e79f245dde ("X86/KVM: Properly update 'tsc_offset' to represent the running guest")
Signed-off-by: Jim Mattson <jmattson@google.com>
Reviewed-by: Krish Sadhukhan <krish.sadhukhan@oracle.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
When we switched from doing rdmsr() to reading FS/GS base values from
current->thread we completely forgot about legacy 32-bit userspaces which
we still support in KVM (why?). task->thread.{fsbase,gsbase} are only
synced for 64-bit processes, calling save_fsgs_for_kvm() and using
its result from current is illegal for legacy processes.
There's no ARCH_SET_FS/GS prctls for legacy applications. Base MSRs are,
however, not always equal to zero. Intel's manual says (3.4.4 Segment
Loading Instructions in IA-32e Mode):
"In order to set up compatibility mode for an application, segment-load
instructions (MOV to Sreg, POP Sreg) work normally in 64-bit mode. An
entry is read from the system descriptor table (GDT or LDT) and is loaded
in the hidden portion of the segment register.
...
The hidden descriptor register fields for FS.base and GS.base are
physically mapped to MSRs in order to load all address bits supported by
a 64-bit implementation.
"
The issue was found by strace test suite where 32-bit ioctl_kvm_run test
started segfaulting.
Reported-by: Dmitry V. Levin <ldv@altlinux.org>
Bisected-by: Masatake YAMATO <yamato@redhat.com>
Fixes: 42b933b597 ("x86/kvm/vmx: read MSR_{FS,KERNEL_GS}_BASE from current->thread")
Cc: stable@vger.kernel.org
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This lets userspace read the MSR_IA32_ARCH_CAPABILITIES and check that all
requested features are available on the host.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Markus reported that BTS is sporadically missing the tail of the trace
in the perf_event data buffer: [decode error (1): instruction overflow]
shown in GDB; and bisected it to the conversion of debug_store to PTI.
A little "optimization" crept into alloc_bts_buffer(), which mistakenly
placed bts_interrupt_threshold away from the 24-byte record boundary.
Intel SDM Vol 3B 17.4.9 says "This address must point to an offset from
the BTS buffer base that is a multiple of the BTS record size."
Revert "max" from a byte count to a record count, to calculate the
bts_interrupt_threshold correctly: which turns out to fix problem seen.
Fixes: c1961a4631 ("x86/events/intel/ds: Map debug buffers in cpu_entry_area")
Reported-and-tested-by: Markus T Metzger <markus.t.metzger@intel.com>
Signed-off-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@intel.com>
Cc: Andi Kleen <andi.kleen@intel.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: stable@vger.kernel.org # v4.14+
Link: https://lkml.kernel.org/r/alpine.LSU.2.11.1807141248290.1614@eggly.anvils
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Merge tag 'for-linus-4.18-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
Pull xen fixes from Juergen Gross:
"Two related fixes for a boot failure of Xen PV guests"
* tag 'for-linus-4.18-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
xen: setup pv irq ops vector earlier
xen: remove global bit from __default_kernel_pte_mask for pv guests
- Build the kernel without the fix
- Add some flag to the purgatories KBUILD_CFLAGS,I used
-fno-asynchronous-unwind-tables
- Re-build the kernel
When you look at makes output you see that sha256.o is not re-build in the
last step. Also readelf -S still shows the .eh_frame section for
sha256.o.
With the fix sha256.o is rebuilt in the last step.
Without FORCE make does not detect changes only made to the command line
options. So object files might not be re-built even when they should be.
Fix this by adding FORCE where it is missing.
Link: http://lkml.kernel.org/r/20180704110044.29279-2-prudo@linux.ibm.com
Fixes: df6f2801f5 ("kernel/kexec_file.c: move purgatories sha256 to common code")
Signed-off-by: Philipp Rudo <prudo@linux.ibm.com>
Acked-by: Dave Young <dyoung@redhat.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: <stable@vger.kernel.org> [4.17+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Setting pv_irq_ops for Xen PV domains should be done as early as
possible in order to support e.g. very early printk() usage.
The same applies to xen_vcpu_info_reset(0), as it is needed for the
pv irq ops.
Move the call of xen_setup_machphys_mapping() after initializing the
pv functions as it contains a WARN_ON(), too.
Remove the no longer necessary conditional in xen_init_irq_ops()
from PVH V1 times to make clear this is a PV only function.
Cc: <stable@vger.kernel.org> # 4.14
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
When removing the global bit from __supported_pte_mask do the same for
__default_kernel_pte_mask in order to avoid the WARN_ONCE() in
check_pgprot() when setting a kernel pte before having called
init_mem_mapping().
Cc: <stable@vger.kernel.org> # 4.17
Reported-by: Michael Young <m.a.young@durham.ac.uk>
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Hans de Goede reported that his mixed EFI mode Bay Trail tablet
would not boot at all any more, but enter a reboot loop without
any logs printed by the kernel.
Unbreak 64-bit Linux/x86 on 32-bit UEFI:
When it was first introduced, the EFI stub code that copies the
contents of PCI option ROMs originally only intended to do so if
the EFI_PCI_IO_ATTRIBUTE_EMBEDDED_ROM attribute was *not* set.
The reason was that the UEFI spec permits PCI option ROM images
to be provided by the platform directly, rather than via the ROM
BAR, and in this case, the OS can only access them at runtime if
they are preserved at boot time by copying them from the areas
described by PciIo->RomImage and PciIo->RomSize.
However, it implemented this check erroneously, as can be seen in
commit:
dd5fc854de ("EFI: Stash ROMs if they're not in the PCI BAR")
which introduced:
if (!attributes & EFI_PCI_IO_ATTRIBUTE_EMBEDDED_ROM)
continue;
and given that the numeric value of EFI_PCI_IO_ATTRIBUTE_EMBEDDED_ROM
is 0x4000, this condition never becomes true, and so the option ROMs
were copied unconditionally.
This was spotted and 'fixed' by commit:
886d751a2e ("x86, efi: correct precedence of operators in setup_efi_pci")
but inadvertently inverted the logic at the same time, defeating
the purpose of the code, since it now only preserves option ROM
images that can be read from the ROM BAR as well.
Unsurprisingly, this broke some systems, and so the check was removed
entirely in the following commit:
739701888f ("x86, efi: remove attribute check from setup_efi_pci")
It is debatable whether this check should have been included in the
first place, since the option ROM image provided to the UEFI driver by
the firmware may be different from the one that is actually present in
the card's flash ROM, and so whatever PciIo->RomImage points at should
be preferred regardless of whether the attribute is set.
As this was the only use of the attributes field, we can remove
the call to PciIo->Attributes() entirely, which is especially
nice because its prototype involves uint64_t type by-value
arguments which the EFI mixed mode has trouble dealing with.
Any mixed mode system with PCI is likely to be affected.
Tested-by: Wilfried Klaebe <linux-kernel@lebenslange-mailadresse.de>
Tested-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/20180711090235.9327-2-ard.biesheuvel@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Pull x86/pti updates from Thomas Gleixner:
"Two small fixes correcting the handling of SSB mitigations on AMD
processors"
* 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/bugs: Fix the AMD SSBD usage of the SPEC_CTRL MSR
x86/bugs: Update when to check for the LS_CFG SSBD mitigation
Pull x86 fixes from Thomas Gleixner:
- Prevent an out-of-bounds access in mtrr_write()
- Break a circular dependency in the new hyperv IPI acceleration code
- Address the build breakage related to inline functions by enforcing
gnu_inline and explicitly bringing native_save_fl() out of line,
which also adds a set of _ARM_ARG macros which provide 32/64bit
safety.
- Initialize the shadow CR4 per cpu variable before using it.
* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/mtrr: Don't copy out-of-bounds data in mtrr_write
x86/hyper-v: Fix the circular dependency in IPI enlightenment
x86/paravirt: Make native_save_fl() extern inline
x86/asm: Add _ASM_ARG* constants for argument registers to <asm/asm.h>
compiler-gcc.h: Add __attribute__((gnu_inline)) to all inline declarations
x86/mm/32: Initialize the CR4 shadow before __flush_tlb_all()
Pull crypto fixes from Herbert Xu:
- add missing RETs in x86 aegis/morus
- fix build error in arm speck
* 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6:
crypto: x86 - Add missing RETs
crypto: arm/speck - fix building in Thumb2 mode
Don't access the provided buffer out of bounds - this can cause a kernel
out-of-bounds read when invoked through sys_splice() or other things that
use kernel_write()/__kernel_write().
Fixes: 7f8ec5a4f0 ("x86/mtrr: Convert to use strncpy_from_user() helper")
Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20180706215003.156702-1-jannh@google.com
