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  1. 18 11月, 2020 2 次提交
  3. 17 11月, 2020 1 次提交
    • C
      x86/microcode/intel: Check patch signature before saving microcode for early loading · 1a371e67
      由 Chen Yu 提交于 
      Currently, scan_microcode() leverages microcode_matches() to check
if the microcode matches the CPU by comparing the family and model.
However, the processor stepping and flags of the microcode signature
should also be considered when saving a microcode patch for early
update.

Use find_matching_signature() in scan_microcode() and get rid of the
now-unused microcode_matches() which is a good cleanup in itself.

Complete the verification of the patch being saved for early loading in
save_microcode_patch() directly. This needs to be done there too because
save_mc_for_early() will call save_microcode_patch() too.

The second reason why this needs to be done is because the loader still
tries to support, at least hypothetically, mixed-steppings systems and
thus adds all patches to the cache that belong to the same CPU model
albeit with different steppings.

For example:

  microcode: CPU: sig=0x906ec, pf=0x2, rev=0xd6
  microcode: mc_saved[0]: sig=0x906e9, pf=0x2a, rev=0xd6, total size=0x19400, date = 2020-04-23
  microcode: mc_saved[1]: sig=0x906ea, pf=0x22, rev=0xd6, total size=0x19000, date = 2020-04-27
  microcode: mc_saved[2]: sig=0x906eb, pf=0x2, rev=0xd6, total size=0x19400, date = 2020-04-23
  microcode: mc_saved[3]: sig=0x906ec, pf=0x22, rev=0xd6, total size=0x19000, date = 2020-04-27
  microcode: mc_saved[4]: sig=0x906ed, pf=0x22, rev=0xd6, total size=0x19400, date = 2020-04-23

The patch which is being saved for early loading, however, can only be
the one which fits the CPU this runs on so do the signature verification
before saving.

 [ bp: Do signature verification in save_microcode_patch()
       and rewrite commit message. ]

Fixes: ec400dde ("x86/microcode_intel_early.c: Early update ucode on Intel's CPU")
Signed-off-by: NChen Yu <yu.c.chen@intel.com>
Signed-off-by: NBorislav Petkov <bp@suse.de>
Cc: stable@vger.kernel.org
Link: https://bugzilla.kernel.org/show_bug.cgi?id=208535
Link: https://lkml.kernel.org/r/20201113015923.13960-1-yu.c.chen@intel.com
      1a371e67
  5. 13 11月, 2020 1 次提交
  7. 10 11月, 2020 1 次提交
  9. 07 11月, 2020 3 次提交
  11. 06 11月, 2020 1 次提交
    • A
      x86/speculation: Allow IBPB to be conditionally enabled on CPUs with always-on STIBP · 1978b3a5
      由 Anand K Mistry 提交于 
      On AMD CPUs which have the feature X86_FEATURE_AMD_STIBP_ALWAYS_ON,
STIBP is set to on and

  spectre_v2_user_stibp == SPECTRE_V2_USER_STRICT_PREFERRED

At the same time, IBPB can be set to conditional.

However, this leads to the case where it's impossible to turn on IBPB
for a process because in the PR_SPEC_DISABLE case in ib_prctl_set() the

  spectre_v2_user_stibp == SPECTRE_V2_USER_STRICT_PREFERRED

condition leads to a return before the task flag is set. Similarly,
ib_prctl_get() will return PR_SPEC_DISABLE even though IBPB is set to
conditional.

More generally, the following cases are possible:

1. STIBP = conditional && IBPB = on for spectre_v2_user=seccomp,ibpb
2. STIBP = on && IBPB = conditional for AMD CPUs with
   X86_FEATURE_AMD_STIBP_ALWAYS_ON

The first case functions correctly today, but only because
spectre_v2_user_ibpb isn't updated to reflect the IBPB mode.

At a high level, this change does one thing. If either STIBP or IBPB
is set to conditional, allow the prctl to change the task flag.
Also, reflect that capability when querying the state. This isn't
perfect since it doesn't take into account if only STIBP or IBPB is
unconditionally on. But it allows the conditional feature to work as
expected, without affecting the unconditional one.

 [ bp: Massage commit message and comment; space out statements for
   better readability. ]

Fixes: 21998a35 ("x86/speculation: Avoid force-disabling IBPB based on STIBP and enhanced IBRS.")
Signed-off-by: NAnand K Mistry <amistry@google.com>
Signed-off-by: NBorislav Petkov <bp@suse.de>
Acked-by: NThomas Gleixner <tglx@linutronix.de>
Acked-by: NTom Lendacky <thomas.lendacky@amd.com>
Link: https://lkml.kernel.org/r/20201105163246.v2.1.Ifd7243cd3e2c2206a893ad0a5b9a4f19549e22c6@changeid
      1978b3a5
  13. 30 10月, 2020 3 次提交
  15. 29 10月, 2020 1 次提交
  17. 28 10月, 2020 3 次提交
  19. 26 10月, 2020 1 次提交
  21. 22 10月, 2020 1 次提交
    • J
      x86/alternative: Don't call text_poke() in lazy TLB mode · abee7c49
      由 Juergen Gross 提交于 
      When running in lazy TLB mode the currently active page tables might
be the ones of a previous process, e.g. when running a kernel thread.

This can be problematic in case kernel code is being modified via
text_poke() in a kernel thread, and on another processor exit_mmap()
is active for the process which was running on the first cpu before
the kernel thread.

As text_poke() is using a temporary address space and the former
address space (obtained via cpu_tlbstate.loaded_mm) is restored
afterwards, there is a race possible in case the cpu on which
exit_mmap() is running wants to make sure there are no stale
references to that address space on any cpu active (this e.g. is
required when running as a Xen PV guest, where this problem has been
observed and analyzed).

In order to avoid that, drop off TLB lazy mode before switching to the
temporary address space.

Fixes: cefa929c ("x86/mm: Introduce temporary mm structs")
Signed-off-by: NJuergen Gross <jgross@suse.com>
Signed-off-by: NPeter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20201009144225.12019-1-jgross@suse.com
      abee7c49
  23. 19 10月, 2020 1 次提交
  25. 18 10月, 2020 1 次提交
    • J
      task_work: cleanup notification modes · 91989c70
      由 Jens Axboe 提交于 
      A previous commit changed the notification mode from true/false to an
int, allowing notify-no, notify-yes, or signal-notify. This was
backwards compatible in the sense that any existing true/false user
would translate to either 0 (on notification sent) or 1, the latter
which mapped to TWA_RESUME. TWA_SIGNAL was assigned a value of 2.

Clean this up properly, and define a proper enum for the notification
mode. Now we have:

- TWA_NONE. This is 0, same as before the original change, meaning no
  notification requested.
- TWA_RESUME. This is 1, same as before the original change, meaning
  that we use TIF_NOTIFY_RESUME.
- TWA_SIGNAL. This uses TIF_SIGPENDING/JOBCTL_TASK_WORK for the
  notification.

Clean up all the callers, switching their 0/1/false/true to using the
appropriate TWA_* mode for notifications.

Fixes: e91b4816 ("task_work: teach task_work_add() to do signal_wake_up()")
Reviewed-by: NThomas Gleixner <tglx@linutronix.de>
Signed-off-by: NJens Axboe <axboe@kernel.dk>
      91989c70
  27. 15 10月, 2020 2 次提交
    • M
      Drivers: hv: vmbus: Add parsing of VMbus interrupt in ACPI DSDT · 626b901f
      由 Michael Kelley 提交于 
      On ARM64, Hyper-V now specifies the interrupt to be used by VMbus
in the ACPI DSDT.  This information is not used on x86 because the
interrupt vector must be hardcoded.  But update the generic
VMbus driver to do the parsing and pass the information to the
architecture specific code that sets up the Linux IRQ.  Update
consumers of the interrupt to get it from an architecture specific
function.
Signed-off-by: NMichael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/1597434304-40631-1-git-send-email-mikelley@microsoft.comSigned-off-by: NWei Liu <wei.liu@kernel.org>
      626b901f
    • J
      x86/unwind/orc: Fix inactive tasks with stack pointer in %sp on GCC 10 compiled kernels · f2ac57a4
      由 Jiri Slaby 提交于 
      GCC 10 optimizes the scheduler code differently than its predecessors.

When CONFIG_DEBUG_SECTION_MISMATCH=y, the Makefile forces GCC not
to inline some functions (-fno-inline-functions-called-once). Before GCC
10, "no-inlined" __schedule() starts with the usual prologue:

  push %bp
  mov %sp, %bp

So the ORC unwinder simply picks stack pointer from %bp and
unwinds from __schedule() just perfectly:

  $ cat /proc/1/stack
  [<0>] ep_poll+0x3e9/0x450
  [<0>] do_epoll_wait+0xaa/0xc0
  [<0>] __x64_sys_epoll_wait+0x1a/0x20
  [<0>] do_syscall_64+0x33/0x40
  [<0>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

But now, with GCC 10, there is no %bp prologue in __schedule():

  $ cat /proc/1/stack
  <nothing>

The ORC entry of the point in __schedule() is:

  sp:sp+88 bp:last_sp-48 type:call end:0

In this case, nobody subtracts sizeof "struct inactive_task_frame" in
__unwind_start(). The struct is put on the stack by __switch_to_asm() and
only then __switch_to_asm() stores %sp to task->thread.sp. But we start
unwinding from a point in __schedule() (stored in frame->ret_addr by
'call') and not in __switch_to_asm().

So for these example values in __unwind_start():

  sp=ffff94b50001fdc8 bp=ffff8e1f41d29340 ip=__schedule+0x1f0

The stack is:

  ffff94b50001fdc8: ffff8e1f41578000 # struct inactive_task_frame
  ffff94b50001fdd0: 0000000000000000
  ffff94b50001fdd8: ffff8e1f41d29340
  ffff94b50001fde0: ffff8e1f41611d40 # ...
  ffff94b50001fde8: ffffffff93c41920 # bx
  ffff94b50001fdf0: ffff8e1f41d29340 # bp
  ffff94b50001fdf8: ffffffff9376cad0 # ret_addr (and end of the struct)

0xffffffff9376cad0 is __schedule+0x1f0 (after the call to
__switch_to_asm).  Now follow those 88 bytes from the ORC entry (sp+88).
The entry is correct, __schedule() really pushes 48 bytes (8*7) + 32 bytes
via subq to store some local values (like 4U below). So to unwind, look
at the offset 88-sizeof(long) = 0x50 from here:

  ffff94b50001fe00: ffff8e1f41578618
  ffff94b50001fe08: 00000cc000000255
  ffff94b50001fe10: 0000000500000004
  ffff94b50001fe18: 7793fab6956b2d00 # NOTE (see below)
  ffff94b50001fe20: ffff8e1f41578000
  ffff94b50001fe28: ffff8e1f41578000
  ffff94b50001fe30: ffff8e1f41578000
  ffff94b50001fe38: ffff8e1f41578000
  ffff94b50001fe40: ffff94b50001fed8
  ffff94b50001fe48: ffff8e1f41577ff0
  ffff94b50001fe50: ffffffff9376cf12

Here                ^^^^^^^^^^^^^^^^ is the correct ret addr from
__schedule(). It translates to schedule+0x42 (insn after a call to
__schedule()).

BUT, unwind_next_frame() tries to take the address starting from
0xffff94b50001fdc8. That is exactly from thread.sp+88-sizeof(long) =
0xffff94b50001fdc8+88-8 = 0xffff94b50001fe18, which is garbage marked as
NOTE above. So this quits the unwinding as 7793fab6956b2d00 is obviously
not a kernel address.

There was a fix to skip 'struct inactive_task_frame' in
unwind_get_return_address_ptr in the following commit:

  187b96db ("x86/unwind/orc: Fix unwind_get_return_address_ptr() for inactive tasks")

But we need to skip the struct already in the unwinder proper. So
subtract the size (increase the stack pointer) of the structure in
__unwind_start() directly. This allows for removal of the code added by
commit 187b96db completely, as the address is now at
'(unsigned long *)state->sp - 1', the same as in the generic case.

[ mingo: Cleaned up the changelog a bit, for better readability. ]

Fixes: ee9f8fce ("x86/unwind: Add the ORC unwinder")
Bug: https://bugzilla.suse.com/show_bug.cgi?id=1176907Signed-off-by: NJiri Slaby <jslaby@suse.cz>
Signed-off-by: NIngo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20201014053051.24199-1-jslaby@suse.cz
      f2ac57a4
  29. 14 10月, 2020 5 次提交
    • K
      x86/kexec: Use up-to-dated screen_info copy to fill boot params · afc18069
      由 Kairui Song 提交于 
      kexec_file_load() currently reuses the old boot_params.screen_info,
but if drivers have change the hardware state, boot_param.screen_info
could contain invalid info.

For example, the video type might be no longer VGA, or the frame buffer
address might be changed. If the kexec kernel keeps using the old screen_info,
kexec'ed kernel may attempt to write to an invalid framebuffer
memory region.

There are two screen_info instances globally available, boot_params.screen_info
and screen_info. Later one is a copy, and is updated by drivers.

So let kexec_file_load use the updated copy.

[ mingo: Tidied up the changelog. ]
Signed-off-by: NKairui Song <kasong@redhat.com>
Signed-off-by: NIngo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20201014092429.1415040-2-kasong@redhat.com
      afc18069
    • M
      x86/setup: simplify reserve_crashkernel() · 6120cdc0
      由 Mike Rapoport 提交于 
      * Replace magic numbers with defines
* Replace memblock_find_in_range() + memblock_reserve() with
  memblock_phys_alloc_range()
* Stop checking for low memory size in reserve_crashkernel_low(). The
  allocation from limited range will anyway fail if there is no enough
  memory, so there is no need for extra traversal of memblock.memory
Signed-off-by: NMike Rapoport <rppt@linux.ibm.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Reviewed-by: NBaoquan He <bhe@redhat.com>
Acked-by: NIngo Molnar <mingo@kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Daniel Axtens <dja@axtens.net>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Emil Renner Berthing <kernel@esmil.dk>
Cc: Hari Bathini <hbathini@linux.ibm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will@kernel.org>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Link: https://lkml.kernel.org/r/20200818151634.14343-15-rppt@kernel.orgSigned-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      6120cdc0
    • M
      x86/setup: simplify initrd relocation and reservation · 3c45ee6d
      由 Mike Rapoport 提交于 
      Currently, initrd image is reserved very early during setup and then it
might be relocated and re-reserved after the initial physical memory
mapping is created.  The "late" reservation of memblock verifies that
mapped memory size exceeds the size of initrd, then checks whether the
relocation required and, if yes, relocates inirtd to a new memory
allocated from memblock and frees the old location.

The check for memory size is excessive as memblock allocation will anyway
fail if there is not enough memory.  Besides, there is no point to
allocate memory from memblock using memblock_find_in_range() +
memblock_reserve() when there exists memblock_phys_alloc_range() with
required functionality.

Remove the redundant check and simplify memblock allocation.
Signed-off-by: NMike Rapoport <rppt@linux.ibm.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Reviewed-by: NBaoquan He <bhe@redhat.com>
Acked-by: NIngo Molnar <mingo@kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Daniel Axtens <dja@axtens.net>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Emil Renner Berthing <kernel@esmil.dk>
Cc: Hari Bathini <hbathini@linux.ibm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will@kernel.org>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Link: https://lkml.kernel.org/r/20200818151634.14343-14-rppt@kernel.orgSigned-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      3c45ee6d
    • D
      efi/fake_mem: arrange for a resource entry per efi_fake_mem instance · 88e9a5b7
      由 Dan Williams 提交于 
      In preparation for attaching a platform device per iomem resource teach
the efi_fake_mem code to create an e820 entry per instance.  Similar to
E820_TYPE_PRAM, bypass merging resource when the e820 map is sanitized.
Signed-off-by: NDan Williams <dan.j.williams@intel.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Acked-by: NArd Biesheuvel <ardb@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: Brice Goglin <Brice.Goglin@inria.fr>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: David Airlie <airlied@linux.ie>
Cc: David Hildenbrand <david@redhat.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: Jason Gunthorpe <jgg@mellanox.com>
Cc: Jeff Moyer <jmoyer@redhat.com>
Cc: Jia He <justin.he@arm.com>
Cc: Joao Martins <joao.m.martins@oracle.com>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Mike Rapoport <rppt@linux.ibm.com>
Cc: Paul Mackerras <paulus@ozlabs.org>
Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Cc: Wei Yang <richard.weiyang@linux.alibaba.com>
Cc: Will Deacon <will@kernel.org>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Hulk Robot <hulkci@huawei.com>
Cc: Jason Yan <yanaijie@huawei.com>
Cc: "Jérôme Glisse" <jglisse@redhat.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: kernel test robot <lkp@intel.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
Link: https://lkml.kernel.org/r/159643096068.4062302.11590041070221681669.stgit@dwillia2-desk3.amr.corp.intel.comSigned-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      88e9a5b7
    • T
      x86/traps: Fix #DE Oops message regression · 5f1ec1fd
      由 Thomas Gleixner 提交于 
      The conversion of #DE to the idtentry mechanism introduced a change in the
Ooops message which confuses tools which parse crash information in dmesg.

Remove the underscore from 'divide_error' to restore previous behaviour.

Fixes: 9d06c402 ("x86/entry: Convert Divide Error to IDTENTRY")
Reported-by: NDmitry Vyukov <dvyukov@google.com>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/CACT4Y+bTZFkuZd7+bPArowOv-7Die+WZpfOWnEO_Wgs3U59+oA@mail.gmail.com
      5f1ec1fd
  31. 07 10月, 2020 13 次提交