x86/speculation/mmio: Enable CPU Fill buffer clearing on idle
stable inclusion from stable-v4.19.248 commit 8b42145e8c9903d4805651e08f4fca628e166642 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I5D5RS CVE: CVE-2022-21123,CVE-2022-21125,CVE-2022-21166 -------------------------------- commit 99a83db5a605137424e1efe29dc0573d6a5b6316 upstream When the CPU is affected by Processor MMIO Stale Data vulnerabilities, Fill Buffer Stale Data Propagator (FBSDP) can propagate stale data out of Fill buffer to uncore buffer when CPU goes idle. Stale data can then be exploited with other variants using MMIO operations. Mitigate it by clearing the Fill buffer before entering idle state. Signed-off-by:Pawan Gupta <pawan.kumar.gupta@linux.intel.com> Signed-off-by:
Thomas Gleixner <tglx@linutronix.de> Co-developed-by:
Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by:
Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by:
Borislav Petkov <bp@suse.de> Signed-off-by:
Thomas Gleixner <tglx@linutronix.de> Signed-off-by:
Thadeu Lima de Souza Cascardo <cascardo@canonical.com> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by:
Yipeng Zou <zouyipeng@huawei.com> Reviewed-by:
Zhang Jianhua <chris.zjh@huawei.com> Reviewed-by:
Liao Chang <liaochang1@huawei.com> Signed-off-by:
Yongqiang Liu <liuyongqiang13@huawei.com>
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