diff options
| author | Purna Pavan Chandra Aekkaladevi <paekkaladevi@linux.microsoft.com> | 2025-10-10 14:55:49 -0700 |
|---|---|---|
| committer | Wei Liu <wei.liu@kernel.org> | 2025-11-15 06:18:16 +0000 |
| commit | fd612d97a458f0c44d1395e2def4fa719ec2ea48 (patch) | |
| tree | 40aeeead5fce173764e5c7db874d5396fcc91aa3 | |
| parent | 59aeea195948fd507cef2e439a5a964b8432750e (diff) | |
mshv: Get the vmm capabilities offered by the hypervisor
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 <paekkaladevi@linux.microsoft.com>
Signed-off-by: Nuno Das Neves <nunodasneves@linux.microsoft.com>
Reviewed-by: Praveen K Paladugu <prapal@linux.microsoft.com>
Reviewed-by: Easwar Hariharan <easwar.hariharan@linux.microsoft.com>
Reviewed-by: Tianyu Lan <tiala@microsoft.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
| -rw-r--r-- | drivers/hv/mshv_root.h | 1 | ||||
| -rw-r--r-- | drivers/hv/mshv_root_main.c | 18 |
2 files changed, 19 insertions, 0 deletions
diff --git a/drivers/hv/mshv_root.h b/drivers/hv/mshv_root.h index 0e62badfc9f1..f47d36d0c942 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 f1fabf52c8f5..33160f6ac028 100644 --- a/drivers/hv/mshv_root_main.c +++ b/drivers/hv/mshv_root_main.c @@ -2203,6 +2203,22 @@ root_sched_deinit: return err; } +static void mshv_init_vmm_caps(struct device *dev) +{ + /* + * This can only fail here if HVCALL_GET_PARTITION_PROPERTY_EX or + * HV_PARTITION_PROPERTY_VMM_CAPABILITIES are not supported. In that + * case it's valid to proceed as if all vmm_caps are disabled (zero). + */ + if (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))) + dev_warn(dev, "Unable to get VMM capabilities\n"); + + dev_dbg(dev, "vmm_caps = %#llx\n", mshv_root.vmm_caps.as_uint64[0]); +} + static int __init mshv_parent_partition_init(void) { int ret; @@ -2255,6 +2271,8 @@ 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; |