vmx_onhyperv.c

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// 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);
}