linux-kernel - Re: [PATCH v3] KVM: PPC: Book3S HV: Mask off LPCR_MER for a vCPU before running it to avoid spurious interrupts

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Message-ID: <87jzd2xdtl.fsf@mpe.ellerman.id.au>
Date: Sun, 17 Nov 2024 23:08:38 +1100
From: Michael Ellerman <mpe@...erman.id.au>
To: Gautam Menghani <gautam@...ux.ibm.com>, npiggin@...il.com,
 christophe.leroy@...roup.eu, naveen@...nel.org, maddy@...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: Re: [PATCH v3] KVM: PPC: Book3S HV: Mask off LPCR_MER for a vCPU
 before running it to avoid spurious interrupts

Gautam Menghani <gautam@...ux.ibm.com> writes:
> Running a L2 vCPU (see [1] for terminology) with LPCR_MER bit set and no
> pending interrupts results in that L2 vCPU getting an infinite flood of
> spurious interrupts. The 'if check' in kvmhv_run_single_vcpu() sets the
> LPCR_MER bit if there are pending interrupts.

Applied to powerpc/fixes.

[1/1] KVM: PPC: Book3S HV: Mask off LPCR_MER for a vCPU before running it to avoid spurious interrupts
      https://git.kernel.org/powerpc/c/a373830f96db288a3eb43a8692b6bcd0bd88dfe1

cheers