| commit | 9de6fe3c28d6d8feadfad907961f1f31b85c6985 | [log] [tgz] |
|---|---|---|
| author | Xiaoyao Li <xiaoyao.li@intel.com> | Fri Apr 10 13:54:01 2020 +0200 |
| committer | Borislav Petkov <bp@suse.de> | Sat Apr 11 16:40:55 2020 +0200 |
| tree | 7f2d97a3a8e88b134b5309f72275c092fb454c2d | |
| parent | d7e94dbdac1a40924626b0efc7ff530c8baf5e4a [diff] |
KVM: x86: Emulate split-lock access as a write in emulator Emulate split-lock accesses as writes if split lock detection is on to avoid #AC during emulation, which will result in a panic(). This should never occur for a well-behaved guest, but a malicious guest can manipulate the TLB to trigger emulation of a locked instruction[1]. More discussion can be found at [2][3]. [1] https://lkml.kernel.org/r/8c5b11c9-58df-38e7-a514-dc12d687b198@redhat.com [2] https://lkml.kernel.org/r/20200131200134.GD18946@linux.intel.com [3] https://lkml.kernel.org/r/20200227001117.GX9940@linux.intel.com Suggested-by: Sean Christopherson <sean.j.christopherson@intel.com> Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com> Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com> 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/20200410115517.084300242@linutronix.de