This is a note to let you know that I've just added the patch titled
KVM: PPC: Book3S HV: Fix pending_pri value in kvmppc_xive_get_icp()
to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
kvm-ppc-book3s-hv-fix-pending_pri-value-in-kvmppc_xive_get_icp.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 7333b5aca412d6ad02667b5a513485838a91b136 Mon Sep 17 00:00:00 2001
From: Laurent Vivier <lvivier@xxxxxxxxxx>
Date: Tue, 12 Dec 2017 18:23:56 +0100
Subject: KVM: PPC: Book3S HV: Fix pending_pri value in kvmppc_xive_get_icp()
From: Laurent Vivier <lvivier@xxxxxxxxxx>
commit 7333b5aca412d6ad02667b5a513485838a91b136 upstream.
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")
Signed-off-by: Laurent Vivier <lvivier@xxxxxxxxxx>
Acked-by: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/kvm/book3s_xive.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/arch/powerpc/kvm/book3s_xive.c
+++ b/arch/powerpc/kvm/book3s_xive.c
@@ -725,7 +725,8 @@ u64 kvmppc_xive_get_icp(struct kvm_vcpu
/* Return the per-cpu state for state saving/migration */
return (u64)xc->cppr << KVM_REG_PPC_ICP_CPPR_SHIFT |
- (u64)xc->mfrr << KVM_REG_PPC_ICP_MFRR_SHIFT;
+ (u64)xc->mfrr << KVM_REG_PPC_ICP_MFRR_SHIFT |
+ (u64)0xff << KVM_REG_PPC_ICP_PPRI_SHIFT;
}
int kvmppc_xive_set_icp(struct kvm_vcpu *vcpu, u64 icpval)
Patches currently in stable-queue which might be from lvivier@xxxxxxxxxx are
queue-4.14/kvm-ppc-book3s-hv-fix-pending_pri-value-in-kvmppc_xive_get_icp.patch
queue-4.14/kvm-ppc-book3s-fix-xive-migration-of-pending-interrupts.patch