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linux-stable/arch/arm64
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Oliver Upton 6826c6849b KVM: arm64: Handle PSCI resets before userspace touches vCPU state 
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
2021-08-19 09:08:56 +01:00
..
boot Networking fixes for 5.14-rc4, including fixes from bpf, can, WiFi (mac80211) 2021-07-30 16:01:36 -07:00
configs Additional Qualcomm ARM64 defconfig udpate for v5.14 2021-06-23 19:01:58 -07:00
crypto crypto: arm64 - use a pattern rule for generating *.S files 2021-05-14 19:07:54 +08:00
include Revert "arm64: cache: Lower ARCH_DMA_MINALIGN to 64 (L1_CACHE_BYTES)" 2021-07-12 13:37:34 +01:00
kernel arm64: smccc: Save lr before calling __arm_smccc_sve_check() 2021-07-21 11:23:25 +01:00
kvm KVM: arm64: Handle PSCI resets before userspace touches vCPU state 2021-08-19 09:08:56 +01:00
lib arm64: Avoid premature usercopy failure 2021-07-15 17:29:14 +01:00
mm Revert "mm/pgtable: add stubs for {pmd/pub}_{set/clear}_huge" 2021-07-21 11:28:09 +01:00
net bpf: Introduce BPF nospec instruction for mitigating Spectre v4 2021-07-29 00:20:56 +02:00
tools arm64: Allow mismatched 32-bit EL0 support 2021-06-11 13:25:40 +01:00
xen
Kbuild bpf: Fix BPF_JIT kconfig symbol dependency 2021-05-20 23:48:37 +02:00
Kconfig arm64: Restrict ARM64_BTI_KERNEL to clang 12.0.0 and newer 2021-07-13 16:31:31 +01:00
Kconfig.debug
Kconfig.platforms Merge branch 'arm/fixes' into arm/soc 2021-07-09 10:46:02 -07:00
Makefile Kbuild updates for v5.14 2021-07-10 11:01:38 -07:00