[Qemu-devel] [PATCH 1/2] AHCI: Do not (re)map FB/CLB buffers while not running

[John Snow <jsnow@redhat.com>]

The FIS Receive Buffer and Command List Buffer pointers
should not be edited while the FIS receive engine or
Command Receive engines are running.

Currently, we attempt to re-map the buffers every time they
are adjusted, but while the AHCI engines are off, these registers
may contain stale values, so we should not attempt to re-map these
values until the engines are reactivated.

Reported-by: Jordan Hargrave <jharg93@gmail.com>
Signed-off-by: John Snow <jsnow@redhat.com>
---
 hw/ide/ahci.c | 35 +++++++++++++++++++++--------------
 1 file changed, 21 insertions(+), 14 deletions(-)

diff --git a/hw/ide/ahci.c b/hw/ide/ahci.c
index 5651372..42bbf7f 100644
--- a/hw/ide/ahci.c
+++ b/hw/ide/ahci.c
@@ -51,6 +51,8 @@ static void ahci_write_fis_d2h(AHCIDevice *ad, uint8_t *cmd_fis);
 static void ahci_init_d2h(AHCIDevice *ad);
 static int ahci_dma_prepare_buf(IDEDMA *dma, int is_write);
 static void ahci_commit_buf(IDEDMA *dma, uint32_t tx_bytes);
+static void ahci_map_clb_address(AHCIDevice *ad);
+static void ahci_map_fis_address(AHCIDevice *ad);
 
 
 static uint32_t  ahci_port_read(AHCIState *s, int port, int offset)
@@ -202,25 +204,15 @@ static void  ahci_port_write(AHCIState *s, int port, int offset, uint32_t val)
     switch (offset) {
         case PORT_LST_ADDR:
             pr->lst_addr = val;
-            map_page(s->as, &s->dev[port].lst,
-                     ((uint64_t)pr->lst_addr_hi << 32) | pr->lst_addr, 1024);
-            s->dev[port].cur_cmd = NULL;
             break;
         case PORT_LST_ADDR_HI:
             pr->lst_addr_hi = val;
-            map_page(s->as, &s->dev[port].lst,
-                     ((uint64_t)pr->lst_addr_hi << 32) | pr->lst_addr, 1024);
-            s->dev[port].cur_cmd = NULL;
             break;
         case PORT_FIS_ADDR:
             pr->fis_addr = val;
-            map_page(s->as, &s->dev[port].res_fis,
-                     ((uint64_t)pr->fis_addr_hi << 32) | pr->fis_addr, 256);
             break;
         case PORT_FIS_ADDR_HI:
             pr->fis_addr_hi = val;
-            map_page(s->as, &s->dev[port].res_fis,
-                     ((uint64_t)pr->fis_addr_hi << 32) | pr->fis_addr, 256);
             break;
         case PORT_IRQ_STAT:
             pr->irq_stat &= ~val;
@@ -235,10 +227,12 @@ static void  ahci_port_write(AHCIState *s, int port, int offset, uint32_t val)
 
             if (pr->cmd & PORT_CMD_START) {
                 pr->cmd |= PORT_CMD_LIST_ON;
+                ahci_map_clb_address(&s->dev[port]);
             }
 
             if (pr->cmd & PORT_CMD_FIS_RX) {
                 pr->cmd |= PORT_CMD_FIS_ON;
+                ahci_map_fis_address(&s->dev[port]);
             }
 
             /* XXX usually the FIS would be pending on the bus here and
@@ -565,6 +559,21 @@ static void debug_print_fis(uint8_t *fis, int cmd_len)
 #endif
 }
 
+static void ahci_map_fis_address(AHCIDevice *ad)
+{
+    AHCIPortRegs *pr = &ad->port_regs;
+    map_page(ad->hba->as, &ad->res_fis,
+             ((uint64_t)pr->fis_addr_hi << 32) | pr->fis_addr, 256);
+}
+
+static void ahci_map_clb_address(AHCIDevice *ad)
+{
+    AHCIPortRegs *pr = &ad->port_regs;
+    ad->cur_cmd = NULL;
+    map_page(ad->hba->as, &ad->lst,
+             ((uint64_t)pr->lst_addr_hi << 32) | pr->lst_addr, 1024);
+}
+
 static void ahci_write_fis_sdb(AHCIState *s, int port, uint32_t finished)
 {
     AHCIDevice *ad = &s->dev[port];
@@ -1366,10 +1375,8 @@ static int ahci_state_post_load(void *opaque, int version_id)
         ad = &s->dev[i];
         AHCIPortRegs *pr = &ad->port_regs;
 
-        map_page(s->as, &ad->lst,
-                 ((uint64_t)pr->lst_addr_hi << 32) | pr->lst_addr, 1024);
-        map_page(s->as, &ad->res_fis,
-                 ((uint64_t)pr->fis_addr_hi << 32) | pr->fis_addr, 256);
+        ahci_map_clb_address(ad);
+        ahci_map_fis_address(ad);
         /*
          * All pending i/o should be flushed out on a migrate. However,
          * we might not have cleared the busy_slot since this is done
-- 
1.9.3