xref: /linux/arch/x86/kvm/vmx/vmx_onhyperv.c (revision 24168c5e6dfbdd5b414f048f47f75d64533296ca)
1 // SPDX-License-Identifier: GPL-2.0-only
2 
3 #include "capabilities.h"
4 #include "vmx_onhyperv.h"
5 
6 DEFINE_STATIC_KEY_FALSE(__kvm_is_using_evmcs);
7 
8 /*
9  * KVM on Hyper-V always uses the latest known eVMCSv1 revision, the assumption
10  * is: in case a feature has corresponding fields in eVMCS described and it was
11  * exposed in VMX feature MSRs, KVM is free to use it. Warn if KVM meets a
12  * feature which has no corresponding eVMCS field, this likely means that KVM
13  * needs to be updated.
14  */
15 #define evmcs_check_vmcs_conf(field, ctrl)					\
16 	do {									\
17 		typeof(vmcs_conf->field) unsupported;				\
18 										\
19 		unsupported = vmcs_conf->field & ~EVMCS1_SUPPORTED_ ## ctrl;	\
20 		if (unsupported) {						\
21 			pr_warn_once(#field " unsupported with eVMCS: 0x%llx\n",\
22 				     (u64)unsupported);				\
23 			vmcs_conf->field &= EVMCS1_SUPPORTED_ ## ctrl;		\
24 		}								\
25 	}									\
26 	while (0)
27 
28 void evmcs_sanitize_exec_ctrls(struct vmcs_config *vmcs_conf)
29 {
30 	evmcs_check_vmcs_conf(cpu_based_exec_ctrl, EXEC_CTRL);
31 	evmcs_check_vmcs_conf(pin_based_exec_ctrl, PINCTRL);
32 	evmcs_check_vmcs_conf(cpu_based_2nd_exec_ctrl, 2NDEXEC);
33 	evmcs_check_vmcs_conf(cpu_based_3rd_exec_ctrl, 3RDEXEC);
34 	evmcs_check_vmcs_conf(vmentry_ctrl, VMENTRY_CTRL);
35 	evmcs_check_vmcs_conf(vmexit_ctrl, VMEXIT_CTRL);
36 }
37