[Qemu-devel] [PATCH v2 10/17] ppc/xive: Introduce xive_tctx_ipb_update()

["Cédric Le Goater" <clg@kaod.org>]

We will use it to resend missed interrupts when a vCPU context is
pushed a HW thread.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
---
 include/hw/ppc/xive.h |  1 +
 hw/intc/xive.c        | 15 +++++++++++----
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/include/hw/ppc/xive.h b/include/hw/ppc/xive.h
index 206b23ecfab3..51e3c37b7483 100644
--- a/include/hw/ppc/xive.h
+++ b/include/hw/ppc/xive.h
@@ -418,6 +418,7 @@ uint64_t xive_tctx_tm_read(XiveTCTX *tctx, hwaddr offset, unsigned size);
 
 void xive_tctx_pic_print_info(XiveTCTX *tctx, Monitor *mon);
 Object *xive_tctx_create(Object *cpu, XiveRouter *xrtr, Error **errp);
+void xive_tctx_ipb_update(XiveTCTX *tctx, uint8_t ring, uint8_t ipb);
 
 static inline uint32_t xive_nvt_cam_line(uint8_t nvt_blk, uint32_t nvt_idx)
 {
diff --git a/hw/intc/xive.c b/hw/intc/xive.c
index 1b0eccb6df40..be66b1fb3261 100644
--- a/hw/intc/xive.c
+++ b/hw/intc/xive.c
@@ -132,6 +132,15 @@ static void xive_tctx_set_cppr(XiveTCTX *tctx, uint8_t ring, uint8_t cppr)
     xive_tctx_notify(tctx, ring);
 }
 
+void xive_tctx_ipb_update(XiveTCTX *tctx, uint8_t ring, uint8_t ipb)
+{
+    uint8_t *regs = &tctx->regs[ring];
+
+    regs[TM_IPB] |= ipb;
+    regs[TM_PIPR] = ipb_to_pipr(regs[TM_IPB]);
+    xive_tctx_notify(tctx, ring);
+}
+
 static inline uint32_t xive_tctx_word2(uint8_t *ring)
 {
     return *((uint32_t *) &ring[TM_WORD2]);
@@ -330,8 +339,7 @@ static void xive_tm_set_os_cppr(XiveTCTX *tctx, hwaddr offset,
 static void xive_tm_set_os_pending(XiveTCTX *tctx, hwaddr offset,
                                    uint64_t value, unsigned size)
 {
-    ipb_update(&tctx->regs[TM_QW1_OS], value & 0xff);
-    xive_tctx_notify(tctx, TM_QW1_OS);
+    xive_tctx_ipb_update(tctx, TM_QW1_OS, priority_to_ipb(value & 0xff));
 }
 
 static uint64_t xive_tm_pull_os_ctx(XiveTCTX *tctx, hwaddr offset,
@@ -1445,8 +1453,7 @@ static bool xive_presenter_notify(XiveRouter *xrtr, uint8_t format,
     found = xive_presenter_match(xrtr, format, nvt_blk, nvt_idx, cam_ignore,
                                  priority, logic_serv, &match);
     if (found) {
-        ipb_update(&match.tctx->regs[match.ring], priority);
-        xive_tctx_notify(match.tctx, match.ring);
+        xive_tctx_ipb_update(match.tctx, match.ring, priority_to_ipb(priority));
     }
 
     return found;
-- 
2.21.0