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
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