Merge branch kvm-arm64/hyp-tracing into kvmarm-master/next

* kvm-arm64/hyp-tracing: (40 commits)
  : .
  : EL2 tracing support, adding both 'remote' ring-buffer
  : infrastructure and the tracing itself, courtesy of
  : Vincent Donnefort. From the cover letter:
  :
  : "The growing set of features supported by the hypervisor in protected
  : mode necessitates debugging and profiling tools. Tracefs is the
  : ideal candidate for this task:
  :
  :   * It is simple to use and to script.
  :
  :   * It is supported by various tools, from the trace-cmd CLI to the
  :     Android web-based perfetto.
  :
  :   * The ring-buffer, where are stored trace events consists of linked
  :     pages, making it an ideal structure for sharing between kernel and
  :     hypervisor.
  :
  : This series first introduces a new generic way of creating remote events and
  : remote buffers. Then it adds support to the pKVM hypervisor."
  : .
  tracing: selftests: Extend hotplug testing for trace remotes
  tracing: Non-consuming read for trace remotes with an offline CPU
  tracing: Adjust cmd_check_undefined to show unexpected undefined symbols
  tracing: Restore accidentally removed SPDX tag
  KVM: arm64: avoid unused-variable warning
  tracing: Generate undef symbols allowlist for simple_ring_buffer
  KVM: arm64: tracing: add ftrace dependency
  tracing: add more symbols to whitelist
  tracing: Update undefined symbols allow list for simple_ring_buffer
  KVM: arm64: Fix out-of-tree build for nVHE/pKVM tracing
  tracing: selftests: Add hypervisor trace remote tests
  KVM: arm64: Add selftest event support to nVHE/pKVM hyp
  KVM: arm64: Add hyp_enter/hyp_exit events to nVHE/pKVM hyp
  KVM: arm64: Add event support to the nVHE/pKVM hyp and trace remote
  KVM: arm64: Add trace reset to the nVHE/pKVM hyp
  KVM: arm64: Sync boot clock with the nVHE/pKVM hyp
  KVM: arm64: Add trace remote for the nVHE/pKVM hyp
  KVM: arm64: Add tracing capability for the nVHE/pKVM hyp
  KVM: arm64: Support unaligned fixmap in the pKVM hyp
  KVM: arm64: Initialise hyp_nr_cpus for nVHE hyp
  ...

Signed-off-by: Marc Zyngier <maz@kernel.org>

arch/arm64/include/asm/kvm_host.h

@@ -923,6 +923,9 @@ struct kvm_vcpu_arch {
 
 	/* Per-vcpu TLB for VNCR_EL2 -- NULL when !NV */
 	struct vncr_tlb	*vncr_tlb;
+
+	/* Hyp-readable copy of kvm_vcpu::pid */
+	pid_t pid;
 };
 
 /*