diff options
author | Thomas Gleixner <tglx@linutronix.de> | 2018-07-14 02:39:55 -0700 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-07-25 10:18:31 +0200 |
commit | 80d7439fb0c446d006599b6347efd255a86a93ca (patch) | |
tree | 634b7536253d9bc0d6d8040ba74d6d7a33f206a7 /block | |
parent | 90cfa767bc12a9931e5e45ed275b069d5b35b52e (diff) |
x86/bugs: Rework spec_ctrl base and mask logic
commit be6fcb5478e95bb1c91f489121238deb3abca46a upstream
x86_spec_ctrL_mask is intended to mask out bits from a MSR_SPEC_CTRL value
which are not to be modified. However the implementation is not really used
and the bitmask was inverted to make a check easier, which was removed in
"x86/bugs: Remove x86_spec_ctrl_set()"
Aside of that it is missing the STIBP bit if it is supported by the
platform, so if the mask would be used in x86_virt_spec_ctrl() then it
would prevent a guest from setting STIBP.
Add the STIBP bit if supported and use the mask in x86_virt_spec_ctrl() to
sanitize the value which is supplied by the guest.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Srivatsa S. Bhat <srivatsa@csail.mit.edu>
Reviewed-by: Matt Helsley (VMware) <matt.helsley@gmail.com>
Reviewed-by: Alexey Makhalov <amakhalov@vmware.com>
Reviewed-by: Bo Gan <ganb@vmware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'block')
0 files changed, 0 insertions, 0 deletions