[PATCH v6 1/2] nvme: indicate CMB support through controller capabilities register

[Andrzej Jakowski]

This patch sets CMBS bit in controller capabilities register when user
configures NVMe driver with CMB support, so capabilites are correctly
reported to guest OS.

Signed-off-by: Andrzej Jakowski <andrzej.jakowski@linux.intel.com>
Reviewed-by: Klaus Jensen <k.jensen@samsung.com>
Reviewed-by: Maxim Levitsky <mlevitsky@gmail.com>
---
 hw/block/nvme.c      |  1 +
 include/block/nvme.h | 10 +++++++---
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/hw/block/nvme.c b/hw/block/nvme.c
index 841c18920c..43866b744f 100644
--- a/hw/block/nvme.c
+++ b/hw/block/nvme.c
@@ -2198,6 +2198,7 @@ static void nvme_init_ctrl(NvmeCtrl *n, PCIDevice 
*pci_dev)
     NVME_CAP_SET_TO(n->bar.cap, 0xf);
     NVME_CAP_SET_CSS(n->bar.cap, 1);
     NVME_CAP_SET_MPSMAX(n->bar.cap, 4);
+    NVME_CAP_SET_CMBS(n->bar.cap, n->params.cmb_size_mb ? 1 : 0);
 
     n->bar.vs = NVME_SPEC_VER;
     n->bar.intmc = n->bar.intms = 0;
diff --git a/include/block/nvme.h b/include/block/nvme.h
index 370df7fc05..d641ca6649 100644
--- a/include/block/nvme.h
+++ b/include/block/nvme.h
@@ -36,6 +36,7 @@ enum NvmeCapShift {
     CAP_MPSMIN_SHIFT   = 48,
     CAP_MPSMAX_SHIFT   = 52,
     CAP_PMR_SHIFT      = 56,
+    CAP_CMB_SHIFT      = 57,
 };
 
 enum NvmeCapMask {
@@ -49,6 +50,7 @@ enum NvmeCapMask {
     CAP_MPSMIN_MASK    = 0xf,
     CAP_MPSMAX_MASK    = 0xf,
     CAP_PMR_MASK       = 0x1,
+    CAP_CMB_MASK       = 0x1,
 };
 
 #define NVME_CAP_MQES(cap)  (((cap) >> CAP_MQES_SHIFT)   & CAP_MQES_MASK)
@@ -78,9 +80,11 @@ enum NvmeCapMask {
 #define NVME_CAP_SET_MPSMIN(cap, val) (cap |= (uint64_t)(val & 
CAP_MPSMIN_MASK)\
                                                            << CAP_MPSMIN_SHIFT)
 #define NVME_CAP_SET_MPSMAX(cap, val) (cap |= (uint64_t)(val & 
CAP_MPSMAX_MASK)\
-                                                            << 
CAP_MPSMAX_SHIFT)
-#define NVME_CAP_SET_PMRS(cap, val) (cap |= (uint64_t)(val & CAP_PMR_MASK)\
-                                                            << CAP_PMR_SHIFT)
+                                                           << CAP_MPSMAX_SHIFT)
+#define NVME_CAP_SET_PMRS(cap, val)   (cap |= (uint64_t)(val & CAP_PMR_MASK)   
\
+                                                           << CAP_PMR_SHIFT)
+#define NVME_CAP_SET_CMBS(cap, val)   (cap |= (uint64_t)(val & CAP_CMB_MASK)   
\
+                                                           << CAP_CMB_SHIFT)
 
 enum NvmeCcShift {
     CC_EN_SHIFT     = 0,
-- 
2.25.4