x86/l1tf: Handle EPT disabled state proper

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If Extended Page Tables (EPT) are disabled or not supported, no L1D
flushing is required. The setup function can just avoid setting up the L1D
flush for the EPT=n case.

Invoke it after the hardware setup has be done and enable_ept has the
correct state and expose the EPT disabled state in the mitigation status as
well.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Jiri Kosina <jkosina@suse.cz>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lkml.kernel.org/r/20180713142322.612160168@linutronix.de

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This commit is contained in:

Thomas Gleixner 2018-07-13 16:23:18 +02:00

parent 2f055947ae

commit a7b9020b06

3 changed files with 54 additions and 45 deletions

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1

arch/x86/include/asm/vmx.h

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9

arch/x86/kernel/cpu/bugs.c

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89

arch/x86/kvm/vmx.c

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