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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>

authored by

Purna Pavan Chandra Aekkaladevi and committed by
Wei Liu fd612d97 59aeea19

+19
+1
drivers/hv/mshv_root.h
··· 178 178 struct hv_synic_pages __percpu *synic_pages; 179 179 spinlock_t pt_ht_lock; 180 180 DECLARE_HASHTABLE(pt_htable, MSHV_PARTITIONS_HASH_BITS); 181 + struct hv_partition_property_vmm_capabilities vmm_caps; 181 182 }; 182 183 183 184 /*
+18
drivers/hv/mshv_root_main.c
··· 2203 2203 return err; 2204 2204 } 2205 2205 2206 + static void mshv_init_vmm_caps(struct device *dev) 2207 + { 2208 + /* 2209 + * This can only fail here if HVCALL_GET_PARTITION_PROPERTY_EX or 2210 + * HV_PARTITION_PROPERTY_VMM_CAPABILITIES are not supported. In that 2211 + * case it's valid to proceed as if all vmm_caps are disabled (zero). 2212 + */ 2213 + if (hv_call_get_partition_property_ex(HV_PARTITION_ID_SELF, 2214 + HV_PARTITION_PROPERTY_VMM_CAPABILITIES, 2215 + 0, &mshv_root.vmm_caps, 2216 + sizeof(mshv_root.vmm_caps))) 2217 + dev_warn(dev, "Unable to get VMM capabilities\n"); 2218 + 2219 + dev_dbg(dev, "vmm_caps = %#llx\n", mshv_root.vmm_caps.as_uint64[0]); 2220 + } 2221 + 2206 2222 static int __init mshv_parent_partition_init(void) 2207 2223 { 2208 2224 int ret; ··· 2270 2254 ret = mshv_root_partition_init(dev); 2271 2255 if (ret) 2272 2256 goto remove_cpu_state; 2257 + 2258 + mshv_init_vmm_caps(dev); 2273 2259 2274 2260 ret = mshv_irqfd_wq_init(); 2275 2261 if (ret)