Public bug reported:

The mainline patch set "arm64: Stolen time support" and its prerequisites are 
required to support future AWS instance types:
 
Reference: 
https://lore.kernel.org/kvm/20191011125930.40834-1-steven.pr...@arm.com/

The list of patches (from mainline) needed for linux-aws/focal is:

e0685fa228fd arm64: Retrieve stolen time as paravirtualized guest
ce4d5ca2b9dd arm/arm64: Make use of the SMCCC 1.1 wrapper
541625ac47ce arm/arm64: Provide a wrapper for SMCCC 1.1 calls
58772e9a3db7 KVM: arm64: Provide VCPU attributes for stolen time
8538cb22bbce KVM: Allow kvm_device_ops to be const
8564d6372a7d KVM: arm64: Support stolen time reporting via shared structure
cac0f1b7285e KVM: Implement kvm_put_guest()
b48c1a45a190 KVM: arm64: Implement PV_TIME_FEATURES call
55009c6ed2d2 KVM: arm/arm64: Factor out hypercall handling from PSCI code
6a7458485b39 KVM: arm64: Document PV-time interface

e6ea46511b1a firmware: arm_sdei: use common SMCCC_CONDUIT_*
a5520eac4d2d firmware/psci: use common SMCCC_CONDUIT_*
6848253ddeae arm: spectre-v2: use arm_smccc_1_1_get_conduit()
c98bd2991728 arm64: errata: use arm_smccc_1_1_get_conduit()
6b7fe77c334a arm/arm64: smccc/psci: add arm_smccc_1_1_get_conduit()

** Affects: linux-aws (Ubuntu)
     Importance: Undecided
     Assignee: Kamal Mostafa (kamalmostafa)
         Status: In Progress

** Affects: linux-aws-5.4 (Ubuntu)
     Importance: Undecided
     Assignee: Kamal Mostafa (kamalmostafa)
         Status: In Progress

** Affects: linux-aws-5.4 (Ubuntu Bionic)
     Importance: Undecided
     Assignee: Kamal Mostafa (kamalmostafa)
         Status: In Progress

** Affects: linux-aws (Ubuntu Focal)
     Importance: Undecided
     Assignee: Kamal Mostafa (kamalmostafa)
         Status: In Progress

** Also affects: linux-aws (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Also affects: linux-aws-5.4 (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: linux-aws (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Also affects: linux-aws-5.4 (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** No longer affects: linux-aws-5.4 (Ubuntu Focal)

** No longer affects: linux-aws (Ubuntu Bionic)

** Changed in: linux-aws (Ubuntu Focal)
     Assignee: (unassigned) => Kamal Mostafa (kamalmostafa)

** Changed in: linux-aws-5.4 (Ubuntu)
     Assignee: (unassigned) => Kamal Mostafa (kamalmostafa)

** Changed in: linux-aws-5.4 (Ubuntu Bionic)
     Assignee: (unassigned) => Kamal Mostafa (kamalmostafa)

** Changed in: linux-aws (Ubuntu Focal)
       Status: New => In Progress

** Changed in: linux-aws-5.4 (Ubuntu)
       Status: New => In Progress

** Changed in: linux-aws-5.4 (Ubuntu Bionic)
       Status: New => In Progress

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https://bugs.launchpad.net/bugs/1889282

Title:
  add pvtime support for arm64 guests

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