kvm-unit-tests/x86/syscall.c

12     u16 cs = read_cs(), ss = read_ss();  in test_syscall_lazy_load()  local
17     wrmsr(MSR_STAR, (uint64_t)cs << 32);  in test_syscall_lazy_load()
28  * This uses 32-bit syscall/sysret because KVM emulates it on Intel processors.
29  * However, the same bug happens with 64-bit syscall/sysret if two vCPUs
36     code_segment_upon_db = regs->cs;  in handle_db()
37     regs->rflags &= ~(1 << 8);  in handle_db()
42     "   cmpl $0, code_segment_upon_db(%rip)\n"
47 /* 32-bit, ring-3 part of test_syscall_tf */
75      *   syscall to syscall32_target -> TF cleared and no singlestep  in test_syscall_tf()
88     rax = (ulong)&tss[0].rsp0;  in test_syscall_tf()
100         printf("wrong CS (%#04x)!\n", code_segment_upon_db);  in test_syscall_tf()