// SPDX-License-Identifier: GPL-2.0-only

#include "capabilities.h"
#include "vmx_onhyperv.h"

DEFINE_STATIC_KEY_FALSE(__kvm_is_using_evmcs);

/*
 * KVM on Hyper-V always uses the latest known eVMCSv1 revision, the assumption
 * is: in case a feature has corresponding fields in eVMCS described and it was
 * exposed in VMX feature MSRs, KVM is free to use it. Warn if KVM meets a
 * feature which has no corresponding eVMCS field, this likely means that KVM
 * needs to be updated.
 */
#define evmcs_check_vmcs_conf(field, ctrl)                                      \
        do {                                                                    \
                typeof(vmcs_conf->field) unsupported;                           \
                                                                                \
                unsupported = vmcs_conf->field & ~EVMCS1_SUPPORTED_ ## ctrl;    \
                if (unsupported) {                                              \
                        pr_warn_once(#field " unsupported with eVMCS: 0x%llx\n",\
                                     (u64)unsupported);                         \
                        vmcs_conf->field &= EVMCS1_SUPPORTED_ ## ctrl;          \
                }                                                               \
        }                                                                       \
        while (0)

void evmcs_sanitize_exec_ctrls(struct vmcs_config *vmcs_conf)
{
        evmcs_check_vmcs_conf(cpu_based_exec_ctrl, EXEC_CTRL);
        evmcs_check_vmcs_conf(pin_based_exec_ctrl, PINCTRL);
        evmcs_check_vmcs_conf(cpu_based_2nd_exec_ctrl, 2NDEXEC);
        evmcs_check_vmcs_conf(cpu_based_3rd_exec_ctrl, 3RDEXEC);
        evmcs_check_vmcs_conf(vmentry_ctrl, VMENTRY_CTRL);
        evmcs_check_vmcs_conf(vmexit_ctrl, VMEXIT_CTRL);
}