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Filename Latest commit message Latest commit date
Sean Christopherson 2fb8e4267c KVM: x86: Ignore sparse banks size for an "all CPUs", non-sparse IPI req 
commit 3244867af8c065e51969f1bffe732d3ebfd9a7d2 upstream.

Do not bail early if there are no bits set in the sparse banks for a
non-sparse, a.k.a. "all CPUs", IPI request.  Per the Hyper-V spec, it is
legal to have a variable length of '0', e.g. VP_SET's BankContents in
this case, if the request can be serviced without the extra info.

  It is possible that for a given invocation of a hypercall that does
  accept variable sized input headers that all the header input fits
  entirely within the fixed size header. In such cases the variable sized
  input header is zero-sized and the corresponding bits in the hypercall
  input should be set to zero.

Bailing early results in KVM failing to send IPIs to all CPUs as expected
by the guest.

Fixes: 214ff83d44 ("KVM: x86: hyperv: implement PV IPI send hypercalls")
Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20211207220926.718794-2-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-12-17 10:12:24 +01:00
arch KVM: x86: Ignore sparse banks size for an "all CPUs", non-sparse IPI req 2021-12-17 10:12:24 +01:00
block block: fix ioprio_get(IOPRIO_WHO_PGRP) vs setuid(2) 2021-12-14 14:49:02 +01:00
certs
crypto crypto: pcrypt - Delay write to padata->info 2021-11-17 09:48:40 +01:00
Documentation dt-bindings: net: Reintroduce PHY no lane swap binding 2021-12-14 14:49:03 +01:00
drivers drm/amd/display: add connector type check for CRC source set 2021-12-17 10:12:24 +01:00
fs tracefs: Set all files to the same group ownership as the mount option 2021-12-14 14:49:02 +01:00
include aio: fix use-after-free due to missing POLLFREE handling 2021-12-14 14:49:02 +01:00
init
ipc shm: extend forced shm destroy to support objects from several IPC nses 2021-12-01 09:23:35 +01:00
kernel tracing: Fix a kmemleak false positive in tracing_map 2021-12-17 10:12:24 +01:00
lib siphash: use _unaligned version by default 2021-12-08 09:01:12 +01:00
LICENSES
mm mm: bdi: initialize bdi_min_ratio when bdi is unregistered 2021-12-14 14:49:00 +01:00
net net: netlink: af_netlink: Prevent empty skb by adding a check on len. 2021-12-17 10:12:23 +01:00
samples samples/kretprobes: Fix return value if register_kretprobe() failed 2021-11-17 09:48:39 +01:00
scripts
security fortify: Explicitly disable Clang support 2021-11-21 13:38:50 +01:00
sound ASoC: qdsp6: q6routing: Fix return value from msm_routing_put_audio_mixer 2021-12-14 14:49:03 +01:00
tools netfilter: selftest: conntrack_vrf.sh: fix file permission 2021-12-16 16:41:08 +01:00
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virt
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Makefile Linux 5.4.166 2021-12-16 16:41:34 +01:00
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.