[PATCH 13/14] pnv/xive: Fix problem with treating NVGC as a NVP

[Michael Kowal <kowal@linux.ibm.com>]

From: Glenn Miles <milesg@linux.ibm.com>

When booting with PHYP, the blk/index for a NVGC was being
mistakenly treated as the blk/index for a NVP.  Renamed
nvp_blk/nvp_idx throughout the code to nvx_blk/nvx_idx to prevent
confusion in the future and now we delay loading the NVP until
the point where we know that the block and index actually point to
a NVP.

Suggested-by: Michael Kowal <kowal@us.ibm.com>
Fixes: 6d4c4f70262 ("ppc/xive2: Support crowd-matching when looking for target")
Signed-off-by: Glenn Miles <milesg@linux.vnet.ibm.com>
Signed-off-by: Michael Kowal <kowal@linux.ibm.com>
---
 hw/intc/xive2.c | 78 ++++++++++++++++++++++++-------------------------
 1 file changed, 39 insertions(+), 39 deletions(-)

diff --git a/hw/intc/xive2.c b/hw/intc/xive2.c
index f812ba9624..8abccd2f4b 100644
--- a/hw/intc/xive2.c
+++ b/hw/intc/xive2.c
@@ -226,8 +226,8 @@ void xive2_end_pic_print_info(Xive2End *end, uint32_t end_idx, GString *buf)
     uint32_t qsize = xive_get_field32(END2_W3_QSIZE, end->w3);
     uint32_t qentries = 1 << (qsize + 10);
 
-    uint32_t nvp_blk = xive_get_field32(END2_W6_VP_BLOCK, end->w6);
-    uint32_t nvp_idx = xive_get_field32(END2_W6_VP_OFFSET, end->w6);
+    uint32_t nvx_blk = xive_get_field32(END2_W6_VP_BLOCK, end->w6);
+    uint32_t nvx_idx = xive_get_field32(END2_W6_VP_OFFSET, end->w6);
     uint8_t priority = xive_get_field32(END2_W7_F0_PRIORITY, end->w7);
     uint8_t pq;
 
@@ -256,7 +256,7 @@ void xive2_end_pic_print_info(Xive2End *end, uint32_t end_idx, GString *buf)
                            xive2_end_is_firmware2(end)   ? 'F' : '-',
                            xive2_end_is_ignore(end) ? 'i' : '-',
                            xive2_end_is_crowd(end)  ? 'c' : '-',
-                           priority, nvp_blk, nvp_idx);
+                           priority, nvx_blk, nvx_idx);
 
     if (qaddr_base) {
         g_string_append_printf(buf, " eq:@%08"PRIx64"% 6d/%5d ^%d",
@@ -401,7 +401,7 @@ static void xive2_pgofnext(uint8_t *nvgc_blk, uint32_t *nvgc_idx,
  * level of pending group interrupts.
  */
 static uint8_t xive2_presenter_backlog_check(XivePresenter *xptr,
-                                             uint8_t nvp_blk, uint32_t nvp_idx,
+                                             uint8_t nvx_blk, uint32_t nvx_idx,
                                              uint8_t first_group,
                                              uint8_t *out_level)
 {
@@ -413,8 +413,8 @@ static uint8_t xive2_presenter_backlog_check(XivePresenter *xptr,
 
     for (prio = 0; prio <= XIVE_PRIORITY_MAX; prio++) {
         current_level = first_group & 0x3F;
-        nvgc_blk = nvp_blk;
-        nvgc_idx = nvp_idx;
+        nvgc_blk = nvx_blk;
+        nvgc_idx = nvx_idx;
 
         while (current_level) {
             xive2_pgofnext(&nvgc_blk, &nvgc_idx, current_level);
@@ -443,7 +443,7 @@ static uint8_t xive2_presenter_backlog_check(XivePresenter *xptr,
 }
 
 static void xive2_presenter_backlog_decr(XivePresenter *xptr,
-                                         uint8_t nvp_blk, uint32_t nvp_idx,
+                                         uint8_t nvx_blk, uint32_t nvx_idx,
                                          uint8_t group_prio,
                                          uint8_t group_level)
 {
@@ -452,8 +452,8 @@ static void xive2_presenter_backlog_decr(XivePresenter *xptr,
     uint8_t nvgc_blk;
     Xive2Nvgc nvgc;
 
-    nvgc_blk = nvp_blk;
-    nvgc_idx = nvp_idx;
+    nvgc_blk = nvx_blk;
+    nvgc_idx = nvx_idx;
     xive2_pgofnext(&nvgc_blk, &nvgc_idx, group_level);
 
     if (xive2_router_get_nvgc(xrtr, NVx_CROWD_LVL(group_level),
@@ -1317,9 +1317,8 @@ static void xive2_router_end_notify(Xive2Router *xrtr, uint8_t end_blk,
     uint8_t priority;
     uint8_t format;
     bool found, precluded;
-    Xive2Nvp nvp;
-    uint8_t nvp_blk;
-    uint32_t nvp_idx;
+    uint8_t nvx_blk;
+    uint32_t nvx_idx;
 
     /* END cache lookup */
     if (xive2_router_get_end(xrtr, end_blk, end_idx, &end)) {
@@ -1384,23 +1383,10 @@ static void xive2_router_end_notify(Xive2Router *xrtr, uint8_t end_blk,
     /*
      * Follows IVPE notification
      */
-    nvp_blk = xive_get_field32(END2_W6_VP_BLOCK, end.w6);
-    nvp_idx = xive_get_field32(END2_W6_VP_OFFSET, end.w6);
-
-    /* NVP cache lookup */
-    if (xive2_router_get_nvp(xrtr, nvp_blk, nvp_idx, &nvp)) {
-        qemu_log_mask(LOG_GUEST_ERROR, "XIVE: no NVP %x/%x\n",
-                      nvp_blk, nvp_idx);
-        return;
-    }
-
-    if (!xive2_nvp_is_valid(&nvp)) {
-        qemu_log_mask(LOG_GUEST_ERROR, "XIVE: NVP %x/%x is invalid\n",
-                      nvp_blk, nvp_idx);
-        return;
-    }
+    nvx_blk = xive_get_field32(END2_W6_VP_BLOCK, end.w6);
+    nvx_idx = xive_get_field32(END2_W6_VP_OFFSET, end.w6);
 
-    found = xive_presenter_notify(xrtr->xfb, format, nvp_blk, nvp_idx,
+    found = xive_presenter_notify(xrtr->xfb, format, nvx_blk, nvx_idx,
                           xive2_end_is_crowd(&end), xive2_end_is_ignore(&end),
                           priority,
                           xive_get_field32(END2_W7_F1_LOG_SERVER_ID, end.w7),
@@ -1428,6 +1414,21 @@ static void xive2_router_end_notify(Xive2Router *xrtr, uint8_t end_blk,
 
         if (!xive2_end_is_ignore(&end)) {
             uint8_t ipb;
+            Xive2Nvp nvp;
+
+            /* NVP cache lookup */
+            if (xive2_router_get_nvp(xrtr, nvx_blk, nvx_idx, &nvp)) {
+                qemu_log_mask(LOG_GUEST_ERROR, "XIVE: no NVP %x/%x\n",
+                              nvx_blk, nvx_idx);
+                return;
+            }
+
+            if (!xive2_nvp_is_valid(&nvp)) {
+                qemu_log_mask(LOG_GUEST_ERROR, "XIVE: NVP %x/%x is invalid\n",
+                              nvx_blk, nvx_idx);
+                return;
+            }
+
             /*
              * Record the IPB in the associated NVP structure for later
              * use. The presenter will resend the interrupt when the vCPU
@@ -1436,7 +1437,7 @@ static void xive2_router_end_notify(Xive2Router *xrtr, uint8_t end_blk,
             ipb = xive_get_field32(NVP2_W2_IPB, nvp.w2) |
                 xive_priority_to_ipb(priority);
             nvp.w2 = xive_set_field32(NVP2_W2_IPB, nvp.w2, ipb);
-            xive2_router_write_nvp(xrtr, nvp_blk, nvp_idx, &nvp, 2);
+            xive2_router_write_nvp(xrtr, nvx_blk, nvx_idx, &nvp, 2);
         } else {
             Xive2Nvgc nvgc;
             uint32_t backlog;
@@ -1449,32 +1450,31 @@ static void xive2_router_end_notify(Xive2Router *xrtr, uint8_t end_blk,
              * counters are stored in the NVG/NVC structures
              */
             if (xive2_router_get_nvgc(xrtr, crowd,
-                                      nvp_blk, nvp_idx, &nvgc)) {
+                                      nvx_blk, nvx_idx, &nvgc)) {
                 qemu_log_mask(LOG_GUEST_ERROR, "XIVE: no %s %x/%x\n",
-                              crowd ? "NVC" : "NVG", nvp_blk, nvp_idx);
+                              crowd ? "NVC" : "NVG", nvx_blk, nvx_idx);
                 return;
             }
 
             if (!xive2_nvgc_is_valid(&nvgc)) {
                 qemu_log_mask(LOG_GUEST_ERROR, "XIVE: NVG %x/%x is invalid\n",
-                              nvp_blk, nvp_idx);
+                              nvx_blk, nvx_idx);
                 return;
             }
 
             /*
              * Increment the backlog counter for that priority.
-             * For the precluded case, we only call broadcast the
-             * first time the counter is incremented. broadcast will
-             * set the LSMFB field of the TIMA of relevant threads so
-             * that they know an interrupt is pending.
+             * We only call broadcast the first time the counter is
+             * incremented. broadcast will set the LSMFB field of the TIMA of
+             * relevant threads so that they know an interrupt is pending.
              */
             backlog = xive2_nvgc_get_backlog(&nvgc, priority) + 1;
             xive2_nvgc_set_backlog(&nvgc, priority, backlog);
-            xive2_router_write_nvgc(xrtr, crowd, nvp_blk, nvp_idx, &nvgc);
+            xive2_router_write_nvgc(xrtr, crowd, nvx_blk, nvx_idx, &nvgc);
 
-            if (precluded && backlog == 1) {
+            if (backlog == 1) {
                 XiveFabricClass *xfc = XIVE_FABRIC_GET_CLASS(xrtr->xfb);
-                xfc->broadcast(xrtr->xfb, nvp_blk, nvp_idx,
+                xfc->broadcast(xrtr->xfb, nvx_blk, nvx_idx,
                                xive2_end_is_crowd(&end),
                                xive2_end_is_ignore(&end),
                                priority);
-- 
2.43.0