Syzos: some L2 exits #6472
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Syzos: some L2 exits #6472
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Ensure L2 correctly exits to L1 on CPUID and resumes properly. Add a test.
Enable basic RDTSC handling. Ensure that Intel hosts exit on RDTSC in L2, and that both Intel and AMD can handle RDTSC exits. Add amd64-syz_kvm_nested_vmresume-rdtsc to test that.
While at it, fix a bug in rdmsr() that apparently lost the top 32 bits. Also fix a bug in Intel's Secondary Processor-based Controls: we were incorrectly using the top 32 bits of X86_MSR_IA32_VMX_PROCBASED_CTLS2 to enable all the available controls without additional setup. This only worked because rdmsr() zeroed out those top bits.
Enable basic RDTSCP handling. Ensure that Intel hosts exit on RDTSCP in L2, and that both Intel and AMD can handle RDTSCP exits. Add amd64-syz_kvm_nested_vmresume-rdtscp to test that.
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a-nogikh
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Nov 21, 2025
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