From: Purna Pavan Chandra Aekkaladevi <paekkalad...@linux.microsoft.com>
Some hypervisor APIs are gated by feature bits in the
"vmm capabilities" partition property. Store the capabilities on
mshv_root module init, using HVCALL_GET_PARTITION_PROPERTY_EX.
This is not supported on all hypervisors. In that case, just set the
capabilities to 0 and proceed as normal.
Signed-off-by: Purna Pavan Chandra Aekkaladevi
<paekkalad...@linux.microsoft.com>
Signed-off-by: Nuno Das Neves <nunodasne...@linux.microsoft.com>
Reviewed-by: Praveen K Paladugu <pra...@linux.microsoft.com>
Reviewed-by: Easwar Hariharan <easwar.hariha...@linux.microsoft.com>
Reviewed-by: Tianyu Lan <ti...@microsoft.com>
---
drivers/hv/mshv_root.h | 1 +
drivers/hv/mshv_root_main.c | 22 ++++++++++++++++++++++
2 files changed, 23 insertions(+)
diff --git a/drivers/hv/mshv_root.h b/drivers/hv/mshv_root.h
index 4aeb03bea6b6..0cb1e2589fe1 100644
--- a/drivers/hv/mshv_root.h
+++ b/drivers/hv/mshv_root.h
@@ -178,6 +178,7 @@ struct mshv_root {
struct hv_synic_pages __percpu *synic_pages;
spinlock_t pt_ht_lock;
DECLARE_HASHTABLE(pt_htable, MSHV_PARTITIONS_HASH_BITS);
+ struct hv_partition_property_vmm_capabilities vmm_caps;
};
/*
diff --git a/drivers/hv/mshv_root_main.c b/drivers/hv/mshv_root_main.c
index 24df47726363..f7738cefbdf3 100644
--- a/drivers/hv/mshv_root_main.c
+++ b/drivers/hv/mshv_root_main.c
@@ -2201,6 +2201,26 @@ static int __init mshv_root_partition_init(struct device
*dev)
return err;
}
+static void mshv_init_vmm_caps(struct device *dev)
+{
+ int ret;
+
+ memset(&mshv_root.vmm_caps, 0, sizeof(mshv_root.vmm_caps));
+ ret = hv_call_get_partition_property_ex(HV_PARTITION_ID_SELF,
+
HV_PARTITION_PROPERTY_VMM_CAPABILITIES,
+ 0, &mshv_root.vmm_caps,
+ sizeof(mshv_root.vmm_caps));
+
+ /*
+ * HVCALL_GET_PARTITION_PROPERTY_EX or
HV_PARTITION_PROPERTY_VMM_CAPABILITIES
+ * may not be supported. Leave them as 0 in that case.
+ */
+ if (ret)
+ dev_warn(dev, "Unable to get VMM capabilities\n");
+
+ dev_dbg(dev, "vmm_caps=0x%llx\n", mshv_root.vmm_caps.as_uint64[0]);
+}
+
static int __init mshv_parent_partition_init(void)
{
int ret;
@@ -2253,6 +2273,8 @@ static int __init mshv_parent_partition_init(void)
if (ret)
goto remove_cpu_state;
+ mshv_init_vmm_caps(dev);
+
ret = mshv_irqfd_wq_init();
if (ret)
goto exit_partition;
--
2.34.1
