linux-kernel - [RFC PATCH 0/2] Fix doorbell emulation for nested KVM guests in V1 API

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Date: Thu, 27 Jun 2024 23:33:34 +0530
From: Gautam Menghani <gautam@...ux.ibm.com>
To: mpe@...erman.id.au, npiggin@...il.com, christophe.leroy@...roup.eu,
        naveen.n.rao@...ux.ibm.com
Cc: Gautam Menghani <gautam@...ux.ibm.com>, linuxppc-dev@...ts.ozlabs.org,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH 0/2] Fix doorbell emulation for nested KVM guests in V1 API

Doorbell emulation for nested KVM guests in V1 API is broken because of
2 reasons:
1. L0 presenting H_EMUL_ASSIST to L1 instead of H_FAC_UNAVAIL
2. Broken plumbing for passing around doorbell state.

Fix the trap passed to L1 and the plumbing for maintaining doorbell
state.

Gautam Menghani (2):
  Revert "KVM: PPC: Book3S HV Nested: Stop forwarding all HFUs to L1"
  arch/powerpc/kvm: Fix doorbells for nested KVM guests on PowerNV

 arch/powerpc/kvm/book3s_hv.c        | 40 ++++++++---------------------
 arch/powerpc/kvm/book3s_hv_nested.c | 20 ++++++++++++---
 2 files changed, 26 insertions(+), 34 deletions(-)

-- 
2.45.1