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When KVM_X86_QUIRK_NESTED_SVM_SHARED_PAT is disabled, verify that KVM correctly virtualizes the host PAT MSR and the guest PAT register for nested SVM guests. With nested NPT disabled: * L1 and L2 share the same PAT * The vmcb12.g_pat is ignored With nested NPT enabled: * An invalid g_pat in vmcb12 causes VMEXIT_INVALID * RDMSR(IA32_PAT) from L2 returns the value of the guest PAT register * WRMSR(IA32_PAT) from L2 is reflected in vmcb12's g_pat on VMEXIT * RDMSR(IA32_PAT) from L1 returns the value of the host PAT MSR Verify that save/restore with the vCPU in guest mode behaves as expected in both cases, e.g. preserves both hPAT and gPAT when NPT is enabled. Originally-by: Jim Mattson <jmattson@google.com> Signed-off-by: Yosry Ahmed <yosry@kernel.org> [sean: use even fancier macro shenanigans] Link: https://patch.msgid.link/20260528231052.404737-1-seanjc@google.com [sean: avoid use of goto, print skips] Signed-off-by: Sean Christopherson <seanjc@google.com>