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authorMario Limonciello <mario.limonciello@amd.com>2022-02-15 21:44:46 -0600
committerBorislav Petkov <bp@suse.de>2022-02-16 19:45:53 +0100
commit08f253ec3767bcfafc5d32617a92cee57c63968e (patch)
tree7904449a2af5f99762707db4fa3a42c0ee2ac519 /Documentation/ABI
parentfa31a4d669bd471e9510db1abf9b91e1a6be6ff7 (diff)
downloadlinux-08f253ec3767bcfafc5d32617a92cee57c63968e.tar.bz2
x86/cpu: Clear SME feature flag when not in use
Currently, the SME CPU feature flag is reflective of whether the CPU supports the feature but not whether it has been activated by the kernel. Change this around to clear the SME feature flag if the kernel is not using it so userspace can determine if it is available and in use from /proc/cpuinfo. As the feature flag is cleared on systems where SME isn't active, use CPUID 0x8000001f to confirm SME availability before calling native_wbinvd(). Signed-off-by: Mario Limonciello <mario.limonciello@amd.com> Signed-off-by: Borislav Petkov <bp@suse.de> Acked-by: Tom Lendacky <thomas.lendacky@amd.com> Link: https://lore.kernel.org/r/20220216034446.2430634-1-mario.limonciello@amd.com
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