1// SPDX-License-Identifier: GPL-2.0-only
2
3#include "capabilities.h"
4#include "vmx_onhyperv.h"
5
6DEFINE_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
28void 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