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Filename Latest commit message Latest commit date
Oliver Upton 810f9b6f0a KVM: arm64: Handle PSCI resets before userspace touches vCPU state 
[ Upstream commit 6826c6849b46aaa91300201213701eb861af4ba0 ]

The CPU_ON PSCI call takes a payload that KVM uses to configure a
destination vCPU to run. This payload is non-architectural state and not
exposed through any existing UAPI. Effectively, we have a race between
CPU_ON and userspace saving/restoring a guest: if the target vCPU isn't
ran again before the VMM saves its state, the requested PC and context
ID are lost. When restored, the target vCPU will be runnable and start
executing at its old PC.

We can avoid this race by making sure the reset payload is serviced
before userspace can access a vCPU's state.

Fixes: 358b28f09f ("arm/arm64: KVM: Allow a VCPU to fully reset itself")
Signed-off-by: Oliver Upton <oupton@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210818202133.1106786-3-oupton@google.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
2021-09-22 12:26:45 +02:00
arch KVM: PPC: Book3S HV: Tolerate treclaim. in fake-suspend mode changing registers 2021-09-22 12:26:42 +02:00
block block, bfq: honor already-setup queue merges 2021-09-22 12:26:44 +02:00
certs
crypto
Documentation dt-bindings: mtd: gpmc: Fix the ECC bytes vs. OOB bytes equation 2021-09-22 12:26:43 +02:00
drivers mfd: tqmx86: Clear GPIO IRQ resource when no IRQ is set 2021-09-22 12:26:44 +02:00
fs fuse: fix use after free in fuse_read_interrupt() 2021-09-22 12:26:43 +02:00
include PCI: Add ACS quirks for NXP LX2xx0 and LX2xx2 platforms 2021-09-22 12:26:43 +02:00
init
ipc
kernel tracing/probes: Reject events which have the same name of existing one 2021-09-22 12:26:43 +02:00
lib lib/test_stackinit: Fix static initializer test 2021-09-22 12:26:38 +02:00
LICENSES
mm mm/memory_hotplug: use "unsigned long" for PFN in zone_for_pfn_range() 2021-09-22 12:26:43 +02:00
net Set fc_nlinfo in nh_create_ipv4, nh_create_ipv6 2021-09-22 12:26:44 +02:00
samples samples: bpf: Fix tracex7 error raised on the missing argument 2021-09-22 12:26:30 +02:00
scripts
security Smack: Fix wrong semantics in smk_access_entry() 2021-09-22 12:26:27 +02:00
sound ASoC: rockchip: i2s: Fixup config for DAIFMT_DSP_A/B 2021-09-22 12:26:35 +02:00
tools perf machine: Initialize srcline string member in add_location struct 2021-09-22 12:26:41 +02:00
usr
virt KVM: arm64: Handle PSCI resets before userspace touches vCPU state 2021-09-22 12:26:45 +02:00
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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.