powerpc/xive: Use hw CPU ids when configuring the CPU queues

The CPU event notification queues on sPAPR should be configured using
a hardware CPU identifier.

The problem did not show up on the Power Hypervisor because pHyp
supports 8 threads per core which keeps CPU number contiguous. This is
not the case on all sPAPR virtual machines, some use SMT=1.

Also improve error logging by adding the CPU number.

Fixes: eac1e731b59e ("powerpc/xive: guest exploitation of the XIVE interrupt controller")
Cc: stable@vger.kernel.org # v4.14+
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/sysdev/xive/spapr.c b/arch/powerpc/sysdev/xive/spapr.c
index d9c4c93660491849029044d37ab8e60160b0d7de..091f1d0d0af190a0d6f274b8cab32960cc1eef86 100644 (file)
--- a/arch/powerpc/sysdev/xive/spapr.c
+++ b/arch/powerpc/sysdev/xive/spapr.c
@@ -356,7 +356,8 @@ static int xive_spapr_configure_queue(u32 target, struct xive_q *q, u8 prio,
 
        rc = plpar_int_get_queue_info(0, target, prio, &esn_page, &esn_size);
        if (rc) {
-               pr_err("Error %lld getting queue info prio %d\n", rc, prio);
+               pr_err("Error %lld getting queue info CPU %d prio %d\n", rc,
+                      target, prio);
                rc = -EIO;
                goto fail;
        }
@@ -370,7 +371,8 @@ static int xive_spapr_configure_queue(u32 target, struct xive_q *q, u8 prio,
        /* Configure and enable the queue in HW */
        rc = plpar_int_set_queue_config(flags, target, prio, qpage_phys, order);
        if (rc) {
-               pr_err("Error %lld setting queue for prio %d\n", rc, prio);
+               pr_err("Error %lld setting queue for CPU %d prio %d\n", rc,
+                      target, prio);
                rc = -EIO;
        } else {
                q->qpage = qpage;
@@ -389,8 +391,8 @@ static int xive_spapr_setup_queue(unsigned int cpu, struct xive_cpu *xc,
        if (IS_ERR(qpage))
                return PTR_ERR(qpage);
 
-       return xive_spapr_configure_queue(cpu, q, prio, qpage,
-                                         xive_queue_shift);
+       return xive_spapr_configure_queue(get_hard_smp_processor_id(cpu),
+                                         q, prio, qpage, xive_queue_shift);
 }
 
 static void xive_spapr_cleanup_queue(unsigned int cpu, struct xive_cpu *xc,
@@ -399,10 +401,12 @@ static void xive_spapr_cleanup_queue(unsigned int cpu, struct xive_cpu *xc,
        struct xive_q *q = &xc->queue[prio];
        unsigned int alloc_order;
        long rc;
+       int hw_cpu = get_hard_smp_processor_id(cpu);
 
-       rc = plpar_int_set_queue_config(0, cpu, prio, 0, 0);
+       rc = plpar_int_set_queue_config(0, hw_cpu, prio, 0, 0);
        if (rc)
-               pr_err("Error %ld setting queue for prio %d\n", rc, prio);
+               pr_err("Error %ld setting queue for CPU %d prio %d\n", rc,
+                      hw_cpu, prio);
 
        alloc_order = xive_alloc_order(xive_queue_shift);
        free_pages((unsigned long)q->qpage, alloc_order);