Jim Mattson 4f256d5770 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: cc440cdad5 ("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>		2026-05-14 05:45:13 -07:00
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asm	KVM: x86: nSVM: Save/restore gPAT with KVM_{GET,SET}_NESTED_STATE	2026-05-14 05:45:13 -07:00