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I suspect there's some >>> incompatibility between sev-es and the test, but I haven't been able to >>> get a good answer on why that might be. >> >> You are talking about test_32bit() in test_shadow_stack.c? > > Yes, that's right. > >> >> That test relies on a specific CET arch behavior. If you try to transition to a >> 32 bit compatibility mode segment with an SSP with high bits set (outside the 32 >> bit address space), a #GP will be triggered by the HW. The test verifies that >> this happens and the kernel handles it appropriately. Could it be platform/mode >> difference and not KVM issue? > > I'm fairly certain that this is an issue with any sev-es guest. The > unexpected seg fault happens when we isolate the sigaction32 call used > in the test regardless of shadow stack support. So I wonder if it's > something similar to the case that the test is checking for. Maybe > something to do with the C bit. Likely something to do with the encryption bit since, if set, will generate an invalid address in 32-bit, right? For SEV-ES, we transition to 64-bit very quickly because of the use of the encryption bit, which is why, for example, we don't support SEV-ES / SEV-SNP in the OvmfIa32X64.dsc package. Thanks, Tom > > Thanks, > John