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f6da81f650
linux/arch/arm64
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Reiji Watanabe f6da81f650 KVM: arm64: PMU: Don't save PMCR_EL0.{C,P} for the vCPU 
Presently, when a guest writes 1 to PMCR_EL0.{C,P}, which is WO/RAZ,
KVM saves the register value, including these bits.
When userspace reads the register using KVM_GET_ONE_REG, KVM returns
the saved register value as it is (the saved value might have these
bits set).  This could result in userspace setting these bits on the
destination during migration.  Consequently, KVM may end up resetting
the vPMU counter registers (PMCCNTR_EL0 and/or PMEVCNTR<n>_EL0) to
zero on the first KVM_RUN after migration.

Fix this by not saving those bits when a guest writes 1 to those bits.

Fixes: ab9468340d ("arm64: KVM: Add access handler for PMCR register")
Cc: stable@vger.kernel.org
Reviewed-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Reiji Watanabe <reijiw@google.com>
Link: https://lore.kernel.org/r/20230313033234.1475987-1-reijiw@google.com
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
2023-03-13 18:05:57 +00:00
..
boot We have one small patch to the clk core this time around. It fixes a corner 2023-02-25 15:16:23 -08:00
configs ARM: SoC fixes for 6.3, part 1 2023-02-27 10:09:40 -08:00
crypto crypto: arm64/sm4-gcm - Fix possible crash in GCM cryption 2023-02-10 17:20:19 +08:00
hyperv hyperv: simplify and rename generate_guest_id 2022-09-28 13:36:56 +00:00
include KVM: arm64: timers: Convert per-vcpu virtual offset to a global value 2023-03-11 02:00:40 -08:00
kernel arm64 fixes: 2023-03-02 14:57:53 -08:00
kvm KVM: arm64: PMU: Don't save PMCR_EL0.{C,P} for the vCPU 2023-03-13 18:05:57 +00:00
lib Merge branch 'for-next/sysregs' into for-next/core 2022-12-06 11:32:25 +00:00
mm arm64 fixes: 2023-03-02 14:57:53 -08:00
net bpf: Remove prog->active check for bpf_lsm and bpf_iter 2022-10-25 23:11:46 -07:00
tools ARM: 2023-02-25 11:30:21 -08:00
xen
Kbuild
Kconfig arm64 fixes: 2023-03-02 14:57:53 -08:00
Kconfig.debug
Kconfig.platforms arm64 updates for 6.3: 2023-02-21 15:27:48 -08:00
Makefile arm64 updates for 6.3: 2023-02-21 15:27:48 -08:00