Re: [PATCH v2 2/3] KVM: PPC: Book3S HV: Don't push XIVE context when not using XIVE device
From: Michael Ellerman <hidden>
Date: 2019-08-22 10:52:51
Also in:
kvm
On Tue, 2019-08-13 at 10:01:00 UTC, Paul Mackerras wrote:
At present, when running a guest on POWER9 using HV KVM but not using
an in-kernel interrupt controller (XICS or XIVE), for example if QEMU
is run with the kernel_irqchip=off option, the guest entry code goes
ahead and tries to load the guest context into the XIVE hardware, even
though no context has been set up.
To fix this, we check that the "CAM word" is non-zero before pushing
it to the hardware. The CAM word is initialized to a non-zero value
in kvmppc_xive_connect_vcpu() and kvmppc_xive_native_connect_vcpu(),
and is now cleared in kvmppc_xive_{,native_}cleanup_vcpu.
Cc: stable@vger.kernel.org # v4.11+
Reported-by: C��dric Le Goater <clg@kaod.org>
Fixes: 5af50993850a ("KVM: PPC: Book3S HV: Native usage of the XIVE interrupt controller")
Signed-off-by: Paul Mackerras <redacted>
Reviewed-by: C��dric Le Goater <clg@kaod.org>Applied to powerpc topic/ppc-kvm, thanks. https://git.kernel.org/powerpc/c/8d4ba9c931bc384bcc6889a43915aaaf19d3e499 cheers