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| author | Jim Mattson <jmattson@google.com> | 2025-10-01 03:14:08 +0300 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2025-10-15 20:57:21 +0300 |
| commit | c53c632592a427bc01266a8ce7e2f17555a3c247 (patch) | |
| tree | 5f9f5f57bd376fb3d224c35e638cba9825b823e7 /scripts | |
| parent | 4793f990ea1523309a58d8fb5237b3a815e6f537 (diff) | |
| download | linux-c53c632592a427bc01266a8ce7e2f17555a3c247.tar.xz | |
KVM: SVM: Disallow EFER.LMSLE when not supported by hardware
Modern AMD CPUs do not support segment limit checks in 64-bit mode
(i.e. EFER.LMSLE must be zero). Do not allow a guest to set EFER.LMSLE
on a CPU that requires the bit to be zero.
For backwards compatibility, allow EFER.LMSLE to be set on CPUs that
support segment limit checks in 64-bit mode, even though KVM's
implementation of the feature is incomplete (e.g. KVM's emulator does
not enforce segment limits in 64-bit mode).
Fixes: eec4b140c924 ("KVM: SVM: Allow EFER.LMSLE to be set with nested svm")
Signed-off-by: Jim Mattson <jmattson@google.com>
Reviewed-by: Nikunj A Dadhania <nikunj@amd.com>
Reviewed-by: Yosry Ahmed <yosry.ahmed@linux.dev>
Link: https://lore.kernel.org/r/20251001001529.1119031-3-jmattson@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'scripts')
0 files changed, 0 insertions, 0 deletions