https://github.com/torvalds/linux
Revision 581abf9127f301511498096564ffcf241bb5371a authored by David Woodhouse on 27 January 2018, 16:24:32 UTC, committed by Seth Forshee on 08 February 2018, 03:08:33 UTC
BugLink: http://bugs.launchpad.net/bugs/1748072 commit 2961298efe1ea1b6fc0d7ee8b76018fa6c0bcef2 We want to expose the hardware features simply in /proc/cpuinfo as "ibrs", "ibpb" and "stibp". Since AMD has separate CPUID bits for those, use them as the user-visible bits. When the Intel SPEC_CTRL bit is set which indicates both IBRS and IBPB capability, set those (AMD) bits accordingly. Likewise if the Intel STIBP bit is set, set the AMD STIBP that's used for the generic hardware capability. Hide the rest from /proc/cpuinfo by putting "" in the comments. Including RETPOLINE and RETPOLINE_AMD which shouldn't be visible there. There are patches to make the sysfs vulnerabilities information non-readable by non-root, and the same should apply to all information about which mitigations are actually in use. Those *shouldn't* appear in /proc/cpuinfo. The feature bit for whether IBPB is actually used, which is needed for ALTERNATIVEs, is renamed to X86_FEATURE_USE_IBPB. Originally-by: Borislav Petkov <bp@suse.de> Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: ak@linux.intel.com Cc: dave.hansen@intel.com Cc: karahmed@amazon.de Cc: arjan@linux.intel.com Cc: torvalds@linux-foundation.org Cc: peterz@infradead.org Cc: bp@alien8.de Cc: pbonzini@redhat.com Cc: tim.c.chen@linux.intel.com Cc: gregkh@linux-foundation.org Link: https://lkml.kernel.org/r/1517070274-12128-2-git-send-email-dwmw@amazon.co.uk Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
1 parent bb3c257
Tip revision: 581abf9127f301511498096564ffcf241bb5371a authored by David Woodhouse on 27 January 2018, 16:24:32 UTC
x86/cpufeatures: Clean up Spectre v2 related CPUID flags
x86/cpufeatures: Clean up Spectre v2 related CPUID flags
Tip revision: 581abf9
File | Mode | Size |
---|---|---|
Documentation | ||
arch | ||
block | ||
certs | ||
crypto | ||
debian | ||
debian.master | ||
drivers | ||
firmware | ||
fs | ||
include | ||
init | ||
ipc | ||
kernel | ||
lib | ||
mm | ||
net | ||
samples | ||
scripts | ||
security | ||
sound | ||
spl | ||
tools | ||
ubuntu | ||
usr | ||
virt | ||
zfs | ||
.cocciconfig | -rw-r--r-- | 59 bytes |
.get_maintainer.ignore | -rw-r--r-- | 31 bytes |
.gitattributes | -rw-r--r-- | 30 bytes |
.gitignore | -rw-r--r-- | 1.4 KB |
.mailmap | -rw-r--r-- | 8.8 KB |
COPYING | -rw-r--r-- | 18.3 KB |
CREDITS | -rw-r--r-- | 96.2 KB |
Kbuild | -rw-r--r-- | 2.2 KB |
Kconfig | -rw-r--r-- | 287 bytes |
MAINTAINERS | -rw-r--r-- | 427.1 KB |
Makefile | -rw-r--r-- | 59.3 KB |
README | -rw-r--r-- | 722 bytes |
dropped.txt | -rw-r--r-- | 3.3 KB |
snapcraft.yaml | -rw-r--r-- | 607 bytes |
![swh spinner](/static/img/swh-spinner.gif)
Computing file changes ...