x86/vmscape: Add conditional IBPB mitigation

{
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                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "arch/x86/include/asm/cpufeatures.h",
                        "arch/x86/include/asm/entry-common.h",
                        "arch/x86/include/asm/nospec-branch.h",
                        "arch/x86/kernel/cpu/bugs.c",
                        "arch/x86/kvm/x86.c"
                    ],
                    "versions": [
                        {
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                        },
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                        },
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                        },
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                        },
                        {
                            "version": "4b3870c343a82cd2df7192cc5149c87205dcc611",
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                            "versionType": "git"
                        },
                        {
                            "version": "3.16.57",
                            "lessThan": "3.17",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "4.4.168",
                            "lessThan": "4.5",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                }

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "arch/x86/include/asm/cpufeatures.h",
                        "arch/x86/include/asm/entry-common.h",
                        "arch/x86/include/asm/nospec-branch.h",
                        "arch/x86/kernel/cpu/bugs.c",
                        "arch/x86/kvm/x86.c"
                    ],
                    "versions": [
                        {
                            "version": "4.16",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "4.16",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.244",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.193",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.152",
                            "lessThanOrEqual": "6.1.*",
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                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.106",
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                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.47",
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                            "versionType": "semver"
                        },
                        {
                            "version": "6.16.7",
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                        },
                        {
                            "version": "6.17",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }