KVM: x86/mmu: Cope with the SS bit being set in #NPF exit codes

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "arch/x86/kvm/mmu.h",
                        "arch/x86/kvm/mmu/paging_tmpl.h"
                    ],
                    "versions": [
                        {
                            "version": "8db428fd5229ba509d515af10d7f33d7d4a54bfe",
                            "lessThan": "0caeefed99b37f03251a00eb1fdb403a1cf2cb68",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8db428fd5229ba509d515af10d7f33d7d4a54bfe",
                            "lessThan": "d6e08ec2fff45e0ec69f11010851650d7c6282b9",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8db428fd5229ba509d515af10d7f33d7d4a54bfe",
                            "lessThan": "e90ab3669181c6469e3647ef2b30ae408275f496",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                }

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "arch/x86/kvm/mmu.h",
                        "arch/x86/kvm/mmu/paging_tmpl.h"
                    ],
                    "versions": [
                        {
                            "version": "6.18",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.18",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.59",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.13",
                            "lessThanOrEqual": "7.2.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.3",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }