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authorLaurent Vivier <lvivier@redhat.com>2017-12-12 18:23:56 +0100
committerMichael Ellerman <mpe@ellerman.id.au>2017-12-22 05:36:24 +0100
commit7333b5aca412d6ad02667b5a513485838a91b136 (patch)
tree7e423044412cb3d9af78fb134a64d07be431a8f8 /arch/x86/entry/entry_64.S
parentKVM: PPC: Book3S: fix XIVE migration of pending interrupts (diff)
downloadlinux-7333b5aca412d6ad02667b5a513485838a91b136.tar.xz
linux-7333b5aca412d6ad02667b5a513485838a91b136.zip
KVM: PPC: Book3S HV: Fix pending_pri value in kvmppc_xive_get_icp()
When we migrate a VM from a POWER8 host (XICS) to a POWER9 host (XICS-on-XIVE), we have an error: qemu-kvm: Unable to restore KVM interrupt controller state \ (0xff000000) for CPU 0: Invalid argument This is because kvmppc_xics_set_icp() checks the new state is internaly consistent, and especially: ... 1129 if (xisr == 0) { 1130 if (pending_pri != 0xff) 1131 return -EINVAL; ... On the other side, kvmppc_xive_get_icp() doesn't set neither the pending_pri value, nor the xisr value (set to 0) (and kvmppc_xive_set_icp() ignores the pending_pri value) As xisr is 0, pending_pri must be set to 0xff. Fixes: 5af50993850a ("KVM: PPC: Book3S HV: Native usage of the XIVE interrupt controller") Cc: stable@vger.kernel.org # v4.12+ Signed-off-by: Laurent Vivier <lvivier@redhat.com> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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