Commit fd612d97 authored by Purna Pavan Chandra Aekkaladevi's avatar Purna Pavan Chandra Aekkaladevi Committed by Wei Liu
Browse files

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: default avatarPurna Pavan Chandra Aekkaladevi <paekkaladevi@linux.microsoft.com>
Signed-off-by: default avatarNuno Das Neves <nunodasneves@linux.microsoft.com>
Reviewed-by: default avatarPraveen K Paladugu <prapal@linux.microsoft.com>
Reviewed-by: default avatarEaswar Hariharan <easwar.hariharan@linux.microsoft.com>
Reviewed-by: default avatarTianyu Lan <tiala@microsoft.com>
Signed-off-by: default avatarWei Liu <wei.liu@kernel.org>
parent 59aeea19

drivers/hv/mshv_root.h

+1 −0
Original line number Diff line number Diff line
@@ -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;

};



/*

drivers/hv/mshv_root_main.c

+18 −0
Original line number Diff line number Diff line
@@ -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;