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KVM: arm64: Sync boot clock with the nVHE/pKVM hyp

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Configure the hypervisor tracing clock with the kernel boot clock. For
tracing purposes, the boot clock is interesting: it doesn't stop on
suspend. However, it is corrected on a regular basis, which implies the
need to re-evaluate it every once in a while.

Cc: John Stultz <jstultz@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Stephen Boyd <sboyd@kernel.org>
Cc: Christopher S. Hall <christopher.s.hall@intel.com>
Cc: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
Link: https://patch.msgid.link/20260309162516.2623589-26-vdonnefort@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Vincent Donnefort
2026-03-09 16:25:11 +00:00
committed by Marc Zyngier
parent 3aed038aac
commit b22888917f
5 changed files with 179 additions and 0 deletions
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arch/arm64/include/asm/kvm_asm.h
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@@ -93,6 +93,7 @@ enum __kvm_host_smccc_func {
__KVM_HOST_SMCCC_FUNC___tracing_unload,
__KVM_HOST_SMCCC_FUNC___tracing_enable,
__KVM_HOST_SMCCC_FUNC___tracing_swap_reader,
__KVM_HOST_SMCCC_FUNC___tracing_update_clock,
};
#define DECLARE_KVM_VHE_SYM(sym) extern char sym[]