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Filename Latest commit message Latest commit date
Paolo Bonzini 7cb6087b45 KVM: x86: reinstate vendor-agnostic check on SPEC_CTRL cpuid bits 
[ Upstream commit 39485ed95d6b83b62fa75c06c2c4d33992e0d971 ]

Until commit e7c587da12 ("x86/speculation: Use synthetic bits for
IBRS/IBPB/STIBP"), KVM was testing both Intel and AMD CPUID bits before
allowing the guest to write MSR_IA32_SPEC_CTRL and MSR_IA32_PRED_CMD.
Testing only Intel bits on VMX processors, or only AMD bits on SVM
processors, fails if the guests are created with the "opposite" vendor
as the host.

While at it, also tweak the host CPU check to use the vendor-agnostic
feature bit X86_FEATURE_IBPB, since we only care about the availability
of the MSR on the host here and not about specific CPUID bits.

Fixes: e7c587da12 ("x86/speculation: Use synthetic bits for IBRS/IBPB/STIBP")
Cc: stable@vger.kernel.org
Reported-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2021-01-06 14:48:36 +01:00
arch KVM: x86: reinstate vendor-agnostic check on SPEC_CTRL cpuid bits 2021-01-06 14:48:36 +01:00
block blk-mq: In blk_mq_dispatch_rq_list() "no budget" is a reason to kick 2020-12-30 11:50:54 +01:00
certs
crypto crypto: ecdh - avoid unaligned accesses in ecdh_set_secret() 2020-12-30 11:51:35 +01:00
Documentation x86/CPU/AMD: Save AMD NodeId as cpu_die_id 2020-12-30 11:51:47 +01:00
drivers vfio/pci: Move dummy_resources_list init in vfio_pci_probe() 2021-01-06 14:48:36 +01:00
fs ext4: don't remount read-only with errors=continue on reboot 2021-01-06 14:48:36 +01:00
include fscrypt: remove kernel-internal constants from UAPI header 2021-01-06 14:48:35 +01:00
init initramfs: fix clang build failure 2020-12-30 11:51:30 +01:00
ipc
kernel Revert: "ring-buffer: Remove HAVE_64BIT_ALIGNED_ACCESS" 2020-12-30 11:51:47 +01:00
lib lib/syscall: fix syscall registers retrieval on 32-bit platforms 2020-12-11 13:23:32 +01:00
LICENSES
mm mm: don't wake kswapd prematurely when watermark boosting is disabled 2020-12-30 11:51:27 +01:00
net net/sched: sch_taprio: reset child qdiscs before freeing them 2021-01-06 14:48:35 +01:00
samples samples: bpf: Fix lwt_len_hist reusing previous BPF map 2020-12-30 11:51:12 +01:00
scripts kconfig: fix return value of do_error_if() 2020-12-30 11:51:29 +01:00
security ima: Don't modify file descriptor mode on the fly 2020-12-30 11:51:39 +01:00
sound ASoC: cx2072x: Fix doubly definitions of Playback and Capture streams 2020-12-30 11:51:35 +01:00
tools perf probe: Fix memory leak when synthesizing SDT probes 2020-12-30 11:51:29 +01:00
usr
virt KVM: arm64: vgic-v3: Drop the reporting of GICR_TYPER.Last for userspace 2020-12-02 08:49:46 +01:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
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COPYING
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Makefile Linux 5.4.86 2020-12-30 11:51:48 +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.