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authorThomas Gleixner <tglx@linutronix.de>2020-04-10 13:54:00 +0200
committerBorislav Petkov <bp@suse.de>2020-04-11 16:39:30 +0200
commitd7e94dbdac1a40924626b0efc7ff530c8baf5e4a (patch)
tree7e41876bdd753a6e9b0e6911cb03bcee99a1c320 /arch/x86/.gitignore
parent5b8b9d0c6d0e0f1993c6c56deaf9646942c49d94 (diff)
downloadlinux-stericsson-d7e94dbdac1a40924626b0efc7ff530c8baf5e4a.tar.gz
x86/split_lock: Provide handle_guest_split_lock()
Without at least minimal handling for split lock detection induced #AC, VMX will just run into the same problem as the VMWare hypervisor, which was reported by Kenneth. It will inject the #AC blindly into the guest whether the guest is prepared or not. Provide a function for guest mode which acts depending on the host SLD mode. If mode == sld_warn, treat it like user space, i.e. emit a warning, disable SLD and mark the task accordingly. Otherwise force SIGBUS. [ bp: Add a !CPU_SUP_INTEL stub for handle_guest_split_lock(). ] Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Borislav Petkov <bp@suse.de> Acked-by: Paolo Bonzini <pbonzini@redhat.com> Link: https://lkml.kernel.org/r/20200410115516.978037132@linutronix.de Link: https://lkml.kernel.org/r/20200402123258.895628824@linutronix.de
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