Oliver Upton a957d82b23 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 12:28:04 +02:00
..
boot	arm64: dts: ls1046a: fix eeprom entries	2021-09-18 13:40:28 +02:00
configs
crypto	crypto: poly1305 - fix poly1305_core_setkey() declaration	2021-05-14 09:50:13 +02:00
include	arm64: head: avoid over-mapping in map_memory	2021-09-18 13:40:08 +02:00
kernel	arm64/sve: Use correct size when reinitialising SVE state	2021-09-22 12:27:54 +02:00
kvm	KVM: arm64: Handle PSCI resets before userspace touches vCPU state	2021-09-22 12:28:04 +02:00
lib
mm	arm64: consistently use reserved_pg_dir	2021-07-14 16:56:06 +02:00
net	bpf: Introduce BPF nospec instruction for mitigating Spectre v4	2021-08-04 12:46:44 +02:00
xen
Kbuild
Kconfig	arm64: mte: Ensure TIF_MTE_ASYNC_FAULT is set atomically	2021-04-21 13:01:00 +02:00
Kconfig.debug
Kconfig.platforms
Makefile	arm64: link with -z norelro for LLD or aarch64-elf	2021-01-12 20:18:24 +01:00