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| author | Xiaoyao Li <xiaoyao.li@intel.com> | 2020-04-10 14:54:01 +0300 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2020-04-11 17:40:55 +0300 |
| commit | 9de6fe3c28d6d8feadfad907961f1f31b85c6985 (patch) | |
| tree | 7f2d97a3a8e88b134b5309f72275c092fb454c2d /arch/arm | |
| parent | d7e94dbdac1a40924626b0efc7ff530c8baf5e4a (diff) | |
| download | linux-9de6fe3c28d6d8feadfad907961f1f31b85c6985.tar.xz | |
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
Diffstat (limited to 'arch/arm')
0 files changed, 0 insertions, 0 deletions