KVM: arm64: Don't populate TPIDR_EL2 in finalise_el2()

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Currently, it is not necessary for __finalise_el2() to configure
TPIDR_EL2:

* The hyp stub code does not consume the value of TPIDR_EL2.

* On the boot cpu, TPIDR_EL1 is used for the percpu offset until the
  ARM64_HAS_VIRT_HOST_EXTN cpucap is detected and boot alternatives
  are patched. Before boot alternatives are patched,
  cpu_copy_el2regs() will copy TPIDR_EL1 into TPIDR_EL2. It is not
  necessary for __finalise_el2() to initialise TPIDR_EL2 before this.

* Secondary CPUs are brought up after boot alternatives have been
  patched, and __secondary_switched() will initialize TPIDR_EL2 in
  'init_cpu_task', after finalise_el2() calls __finalise_el2()

* KVM hyp code which may consume TPIDR_EL2 is brought up after all
  secondaries have been booted, once TPIDR_El2 has been configured on
  all CPUs.

Remove the redundant initialisation from __finalise_el2().

Cc: Oliver Upton <oupton@kernel.org>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://patch.msgid.link/20260518153127.6078-1-will@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>

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This commit is contained in:

Will Deacon 2026-05-18 16:31:26 +01:00 • committed by Marc Zyngier

parent 1bdcdc84f9

commit 4cceeb8da3

1 changed files with 1 additions and 3 deletions

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arch/arm64/kernel/hyp-stub.S

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