linux-kernel - Re: [PATCH 0/3] Fix doorbell emulation for nested KVM guests in V1 API

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Message-Id: <173184457526.887714.4884403618372389811.b4-ty@ellerman.id.au>
Date: Sun, 17 Nov 2024 22:56:15 +1100
From: Michael Ellerman <patch-notifications@...erman.id.au>
To: mpe@...erman.id.au, npiggin@...il.com, christophe.leroy@...roup.eu, naveen@...nel.org, maddy@...ux.ibm.com, vaibhav@...ux.ibm.com, Gautam Menghani <gautam@...ux.ibm.com>
Cc: linuxppc-dev@...ts.ozlabs.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] Fix doorbell emulation for nested KVM guests in V1 API

On Sat, 09 Nov 2024 12:02:54 +0530, Gautam Menghani wrote:
> 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.
> 
> [...]

Applied to powerpc/topic/ppc-kvm.

[1/3] Revert "KVM: PPC: Book3S HV Nested: Stop forwarding all HFUs to L1"
      https://git.kernel.org/powerpc/c/ed351c57432122c4499be4f4aee8711d6fa93f3b
[2/3] KVM: PPC: Book3S HV: Stop using vc->dpdes for nested KVM guests
      https://git.kernel.org/powerpc/c/0d3c6b28896f9889c8864dab469e0343a0ad1c0c
[3/3] KVM: PPC: Book3S HV: Avoid returning to nested hypervisor on pending doorbells
      https://git.kernel.org/powerpc/c/26686db69917399fa30e3b3135360771e90f83ec

cheers