[PATCH v2 0/6] KVM: arm64: EL2 synchronisation and pKVM stage-2 error propagation fixes

[Fuad Tabba <tabba@google.com>]

Hi folks,

V2 of the kvm/arm64 audit fixes [1].

Changes since v1:

    Patch 1 (SCTLR_EL2.EIS|EOS): Fixes: tag corrected to 0a35bd285f43
    ("arm64: Convert SCTLR_EL2 to sysreg infrastructure"); the commit
    message now explains that the conversion auto-generated
    SCTLR_EL2_RES1 to UL(0).  Code unchanged.

    Patches 2-3 (NULL vcpu guard, __deactivate_fgt typo): unchanged.

    Patch 4 (new): Seed selftest_vcpu's memcache to mirror
    hyp-main.c's pkvm_refill_memcache() flow; required by the
    pre-check in patches 5-6.

    Patches 5-6 (host->guest share/donate, formerly v1 patches 5-6):
    reworked to pre-check the vcpu memcache against
    kvm_mmu_cache_min_pages() during the existing pre-check pass,
    before any state mutation.  The WARN_ON() around
    kvm_pgtable_stage2_map() then asserts an invariant the pre-check
    pass establishes, rather than swallowing a reachable -ENOMEM.

Dropped since v1:

    - Patch 2 (HCR_EL2 sync): failure path not reachable.
    - Patches 7-8 (guest->host share/unshare): the stage-2 map cannot
      fail at those call sites (the leaf already exists).

Carried `Reviewed-by` tag (thanks!) and added `Assisted-by:` tags.

Note that with `review-prompts` in the `Assisted-by:` tags, I am
referring to subsystem guides that I added to the base prompts [2],
which I plan submit for upstreaming.

Cheers,
/fuad

[1] https://lore.kernel.org/all/20260428103008.696141-1-tabba@google.com/
[2] https://github.com/masoncl/review-prompts

Fuad Tabba (6):
  KVM: arm64: Make EL2 exception entry and exit context-synchronization
    events
  KVM: arm64: Guard against NULL vcpu on VHE hyp panic path
  KVM: arm64: Fix __deactivate_fgt macro parameter typo
  KVM: arm64: Seed pkvm_ownership_selftest vcpu memcache
  KVM: arm64: Pre-check vcpu memcache for host->guest share
  KVM: arm64: Pre-check vcpu memcache for host->guest donate

 arch/arm64/include/asm/sysreg.h         |  2 +-
 arch/arm64/kvm/hyp/include/hyp/switch.h |  2 +-
 arch/arm64/kvm/hyp/nvhe/mem_protect.c   | 24 ++++++++++++++++++++++++
 arch/arm64/kvm/hyp/nvhe/pkvm.c          | 16 +++++++++++++++-
 arch/arm64/kvm/hyp/vhe/switch.c         |  3 ++-
 5 files changed, 43 insertions(+), 4 deletions(-)

-- 
2.54.0.545.g6539524ca2-goog