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| author | Jim Mattson <jmattson@google.com> | 2026-04-07 12:03:31 -0700 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2026-05-14 05:45:13 -0700 |
| commit | 4f256d5770febb9d61f9b57a4c79c491bf4987f1 (patch) | |
| tree | d04ca442da0b45b5afd797172ad6da0d48ca6da2 /tools/lib/python/kdoc/parse_data_structs.py | |
| parent | 32ebdbce3b2332f049cab5d0dc534471f2b0d7f6 (diff) | |
KVM: x86: nSVM: Save/restore gPAT with KVM_{GET,SET}_NESTED_STATE
Add a 'gpat' field to kvm_svm_nested_state_hdr to carry L2's guest PAT
value across save and restore.
When KVM_X86_QUIRK_NESTED_SVM_SHARED_PAT is disabled and the vCPU is in
guest mode with nested NPT enabled, save vmcb02's g_pat into the header on
KVM_GET_NESTED_STATE, and restore it on KVM_SET_NESTED_STATE.
Host-initiated accesses to IA32_PAT (via KVM_GET/SET_MSRS) always target
L1's hPAT, so they cannot be used to save or restore gPAT. The separate
header field ensures that KVM_GET/SET_MSRS and KVM_GET/SET_NESTED_STATE are
independent and can be ordered arbitrarily during save and restore.
Note that struct kvm_svm_nested_state_hdr is included in a union padded to
120 bytes, so there is room to add the gpat field without changing any
offsets.
Fixes: cc440cdad5b7 ("KVM: nSVM: implement KVM_GET_NESTED_STATE and KVM_SET_NESTED_STATE")
Signed-off-by: Jim Mattson <jmattson@google.com>
Link: https://patch.msgid.link/20260407190343.325299-9-jmattson@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'tools/lib/python/kdoc/parse_data_structs.py')
0 files changed, 0 insertions, 0 deletions