diff options
| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2017-09-06 15:20:55 +1000 |
|---|---|---|
| committer | Paul Mackerras <paulus@ozlabs.org> | 2017-09-12 16:02:07 +1000 |
| commit | d222af072380c4470295c07d84ecb15f4937e365 (patch) | |
| tree | 10fae9caad0faf7928465d2d7cffd892dfc5ce4d /arch/powerpc/kvm/book3s_xive_template.c | |
| parent | 5f54c8b2d4fad95d1f8ecbe023ebe6038e6d3760 (diff) | |
KVM: PPC: Book3S HV: Don't access XIVE PIPR register using byte accesses
The XIVE interrupt controller on POWER9 machines doesn't support byte
accesses to any register in the thread management area other than the
CPPR (current processor priority register). In particular, when
reading the PIPR (pending interrupt priority register), we need to
do a 32-bit or 64-bit load.
Cc: stable@vger.kernel.org # v4.13
Fixes: 2c4fb78f78b6 ("KVM: PPC: Book3S HV: Workaround POWER9 DD1.0 bug causing IPB bit loss")
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Diffstat (limited to 'arch/powerpc/kvm/book3s_xive_template.c')
| -rw-r--r-- | arch/powerpc/kvm/book3s_xive_template.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/arch/powerpc/kvm/book3s_xive_template.c b/arch/powerpc/kvm/book3s_xive_template.c index d1ed2c41b5d2..c7a5deadd1cc 100644 --- a/arch/powerpc/kvm/book3s_xive_template.c +++ b/arch/powerpc/kvm/book3s_xive_template.c @@ -28,7 +28,8 @@ static void GLUE(X_PFX,ack_pending)(struct kvmppc_xive_vcpu *xc) * bit. */ if (cpu_has_feature(CPU_FTR_POWER9_DD1)) { - u8 pipr = __x_readb(__x_tima + TM_QW1_OS + TM_PIPR); + __be64 qw1 = __x_readq(__x_tima + TM_QW1_OS); + u8 pipr = be64_to_cpu(qw1) & 0xff; if (pipr >= xc->hw_cppr) return; } @@ -336,7 +337,6 @@ X_STATIC unsigned long GLUE(X_PFX,h_ipoll)(struct kvm_vcpu *vcpu, unsigned long struct kvmppc_xive_vcpu *xc = vcpu->arch.xive_vcpu; u8 pending = xc->pending; u32 hirq; - u8 pipr; pr_devel("H_IPOLL(server=%ld)\n", server); @@ -353,7 +353,8 @@ X_STATIC unsigned long GLUE(X_PFX,h_ipoll)(struct kvm_vcpu *vcpu, unsigned long pending = 0xff; } else { /* Grab pending interrupt if any */ - pipr = __x_readb(__x_tima + TM_QW1_OS + TM_PIPR); + __be64 qw1 = __x_readq(__x_tima + TM_QW1_OS); + u8 pipr = be64_to_cpu(qw1) & 0xff; if (pipr < 8) pending |= 1 << pipr; } |