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mshv: Get the vmm capabilities offered by the hypervisor

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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>
This commit is contained in:
Purna Pavan Chandra Aekkaladevi 2025-10-10 14:55:49 -07:00 committed by Wei Liu
parent 59aeea1959
commit fd612d97a4
2 changed files with 19 additions and 0 deletions
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1
drivers/hv/mshv_root.h
View File

@ -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;
};
/*

18
drivers/hv/mshv_root_main.c
View File

@ -2203,6 +2203,22 @@ static int __init mshv_root_partition_init(struct device *dev)
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;