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