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Sean Christopherson 8fcdfa71ba KVM: VMX: Intercept FS/GS_BASE MSR accesses for 32-bit KVM 
[ Upstream commit dbdd096a5a74b94f6b786a47baef2085859b0dce ]

Disable pass-through of the FS and GS base MSRs for 32-bit KVM.  Intel's
SDM unequivocally states that the MSRs exist if and only if the CPU
supports x86-64.  FS_BASE and GS_BASE are mostly a non-issue; a clever
guest could opportunistically use the MSRs without issue.  KERNEL_GS_BASE
is a bigger problem, as a clever guest would subtly be broken if it were
migrated, as KVM disallows software access to the MSRs, and unlike the
direct variants, KERNEL_GS_BASE needs to be explicitly migrated as it's
not captured in the VMCS.

Fixes: 25c5f225be ("KVM: VMX: Enable MSR Bitmap feature")
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210422023831.3473491-1-seanjc@google.com>
[*NOT* for stable kernels. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2021-05-14 09:50:43 +02:00
arch KVM: VMX: Intercept FS/GS_BASE MSR accesses for 32-bit KVM 2021-05-14 09:50:43 +02:00
block block: return -EBUSY when there are open partitions in blkdev_reread_part 2021-04-28 13:39:59 +02:00
certs certs: Fix blacklist flag type confusion 2021-03-04 11:37:59 +01:00
crypto async_xor: increase src_offs when dropping destination page 2021-05-14 09:49:59 +02:00
Documentation media: docs: Fix data organization of MEDIA_BUS_FMT_RGB101010_1X30 2021-05-14 09:50:23 +02:00
drivers bnxt_en: Fix RX consumer index logic in the error path. 2021-05-14 09:50:43 +02:00
fs ovl: invalidate readdir cache on changes to dir with origin 2021-05-14 09:50:35 +02:00
include netfilter: nftables_offload: VLAN id needs host byteorder in flow dissector 2021-05-14 09:50:40 +02:00
init seccomp: Fix CONFIG tests for Seccomp_filters 2021-05-14 09:50:24 +02:00
ipc
kernel sched/debug: Fix cgroup_path[] serialization 2021-05-14 09:50:28 +02:00
lib bug: Remove redundant condition check in report_bug 2021-05-14 09:50:32 +02:00
LICENSES
mm mm: ptdump: fix build failure 2021-04-21 13:00:57 +02:00
net vsock/virtio: free queued packets when closing socket 2021-05-14 09:50:41 +02:00
samples samples, bpf: Add missing munmap in xdpsock 2021-03-17 17:06:12 +01:00
scripts kasan: fix hwasan build for gcc 2021-04-28 13:40:02 +02:00
security ima: Fix the error code for restoring the PCR value 2021-05-14 09:50:30 +02:00
sound ALSA: usb: midi: don't return -ENOMEM when usb_urb_ep_type_check fails 2021-05-14 09:50:40 +02:00
tools selftests: mlxsw: Remove a redundant if statement in tc_flower_scale test 2021-05-14 09:50:43 +02:00
usr
virt KVM: Stop looking for coalesced MMIO zones if the bus is destroyed 2021-05-14 09:50:04 +02:00
.clang-format RDMA 5.10 pull request 2020-10-17 11:18:18 -07:00
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap mailmap: add two more addresses of Uwe Kleine-König 2020-12-06 10:19:07 -08:00
COPYING
CREDITS MAINTAINERS: Move Jason Cooper to CREDITS 2020-11-30 10:20:34 +01:00
Kbuild
Kconfig
MAINTAINERS MAINTAINERS: move the staging subsystem to lists.linux.dev 2021-03-25 09:04:18 +01:00
Makefile Linux 5.10.36 2021-05-11 14:47:41 +02:00
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.