commit 1e31927aa64545ee97a2a41db9984c9931afc50a upstream.

Recently kernelCI reported the board mt7622-rfb1 has a fail test with
kernel: ERROR: did not start booting whose details could be seen at [1].

The cause is that UART0 can't output anything when it's missing a proper
pin setup with current DTS, so the essential driver is always getting
enabled to fix up the issue.

[1] https://kernelci.org/boot/id/5ad7d62759b51461bfb1f829/

Cc: Kevin Hilman <khilman@baylibre.com>
Cc: stable@vger.kernel.org
Fixes: ae457b7679c4 ("arm64: dts: mt7622: add SoC and peripheral related device nodes")
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit 3c9fa24ca7c9c47605672916491f79e8ccacb9e6 upstream.

The functions that were used in the emulation of fxrstor, fxsave, sgdt and
sidt were originally meant for task switching, and as such they did not
check privilege levels.  This is very bad when the same functions are used
in the emulation of unprivileged instructions.  This is CVE-2018-10853.

The obvious fix is to add a new argument to ops->read_std and ops->write_std,
which decides whether the access is a "system" access or should use the
processor's CPL.

Fixes: 129a72a0d3c8 ("KVM: x86: Introduce segmented_write_std", 2017-01-12)
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit ce14e868a54edeb2e30cb7a7b104a2fc4b9d76ca upstream.

Int the next patch the emulator's .read_std and .write_std callbacks will
grow another argument, which is not needed in kvm_read_guest_virt and
kvm_write_guest_virt_system's callers.  Since we have to make separate
functions, let's give the currently existing names a nicer interface, too.

Fixes: 129a72a0d3c8 ("KVM: x86: Introduce segmented_write_std", 2017-01-12)
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit 727ba748e110b4de50d142edca9d6a9b7e6111d8 upstream.

VMX instructions executed inside a L1 VM will always trigger a VM exit
even when executed with cpl 3. This means we must perform the
privilege check in software.

Fixes: 70f3aac964ae("kvm: nVMX: Remove superfluous VMX instruction fault checks")
Cc: stable@vger.kernel.org
Signed-off-by: Felix Wilhelm <fwilhelm@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit 766d3571d8e50d3a73b77043dc632226f9e6b389 upstream.

KVM_X86_DISABLE_EXITS_HTL really refers to exit on halt.
Obviously a typo: should be named KVM_X86_DISABLE_EXITS_HLT.

Fixes: caa057a2cad ("KVM: X86: Provide a capability to disable HLT intercepts")
Cc: stable@vger.kernel.org
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit 79367a65743975e5cac8d24d08eccc7fdae832b0 upstream.

Wrap the common invocation of ctxt->ops->read_std and ctxt->ops->write_std, so
as to have a smaller patch when the functions grow another argument.

Fixes: 129a72a0d3c8 ("KVM: x86: Introduce segmented_write_std", 2017-01-12)
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit a780a3ea628268b2ad0ed43d7f28d90db0ff18be upstream.

MSB of CR3 is a reserved bit if the PCIDE bit is not set in CR4.
It should be checked when PCIDE bit is not set, however commit
'd1cd3ce900441 ("KVM: MMU: check guest CR3 reserved bits based on
its physical address width")' removes the bit 63 checking
unconditionally. This patch fixes it by checking bit 63 of CR3
when PCIDE bit is not set in CR4.

Fixes: d1cd3ce900441 (KVM: MMU: check guest CR3 reserved bits based on its physical address width)
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Liran Alon <liran.alon@oracle.com>
Cc: stable@vger.kernel.org
Reviewed-by: Junaid Shahid <junaids@google.com>
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Pull MIPS fixes from James Hogan:
 "A final few MIPS fixes for 4.17:

   - drop Lantiq gphy reboot/remove reset (4.14)

   - prctl(PR_SET_FP_MODE): Disallow PRE without FR (4.0)

   - ptrace(PTRACE_PEEKUSR): Fix 64-bit FGRs (3.15)"

* tag 'mips_fixes_4.17_3' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux:
  MIPS: ptrace: Fix PTRACE_PEEKUSR requests for 64-bit FGRs
  MIPS: prctl: Disallow FRE without FR with PR_SET_FP_MODE requests
  MIPS: lantiq: gphy: Drop reboot/remove reset asserts

Pull s390 fixes from Martin Schwidefsky:

 - a missing -msoft-float for the compile of the kexec purgatory

 - a fix for the dasd driver to avoid the double use of a field in the
   'struct request'

[ That latter one is being discussed, and Christoph asked for something
  cleaner, but for now it's a fix ]

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/dasd: use blk_mq_rq_from_pdu for per request data
  s390/purgatory: Fix endless interrupt loop

Pull nds32 fixes from Greentime Hu:
 "Bug fixes and build error fixes for nds32"

* tag 'nds32-for-linus-4.17-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/greentime/linux:
  nds32: Fix compiler warning, Wstringop-overflow, in vdso.c
  nds32: Disable local irq before calling cpu_dcache_wb_page in copy_user_highpage
  nds32: Flush the cache of the page at vmaddr instead of kaddr in flush_anon_page
  nds32: Correct flush_dcache_page function
  nds32: Fix the unaligned access handler
  nds32: Renaming the file for unaligned access
  nds32: To fix a cache inconsistency issue by setting correct cacheability of NTC
  nds32: To refine readability of INT_MASK_INITAIAL_VAL
  nds32: Fix the virtual address may map too much range by tlbop issue.
  nds32: Fix the allmodconfig build. To make sure CONFIG_CPU_LITTLE_ENDIAN is default y
  nds32: Fix build failed because arch_trace_hardirqs_off is changed to trace_hardirqs_off.
  nds32: Fix the unknown type u8 issue.
  nds32: Fix the symbols undefined issue by exporting them.
  nds32: Fix xfs_buf built failed by export invalidate_kernel_vmap_range and flush_kernel_vmap_range
  nds32: Fix drivers/gpu/drm/udl/udl_fb.c building error by defining PAGE_SHARED
  nds32: Fix building error of crypto/xor.c by adding xor.h
  nds32: Fix building error when CONFIG_FREEZE is enabled.
  nds32: lib: To use generic lib instead of libgcc to prevent the symbol undefined issue.