x86/speculation: Remove x86_spec_ctrl_mask
This mask has been made redundant by kvm_spec_ctrl_test_value(). And it doesn't even work when MSR interception is disabled, as the guest can just write to SPEC_CTRL directly. Signed-off-by: NJosh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: NBorislav Petkov <bp@suse.de> Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com> Signed-off-by: NBorislav Petkov <bp@suse.de>
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