search for: vcpu_thread_flag

Hi, I implemented my own Hypercall in xen. Now I wish my application under dom0 could talk to Xen via my hypercall. Currently, I make a stub in dom0''s kernel, which works as a proxy to forward the request. So, my application first makes a system call to dom0, which then makes hypercall to xen. Is this design necessary? May I call hypercalls from user application under dom0 directly?

...# RSP je 1f @@ -127,6 +131,9 @@ ENTRY(syscall_enter) movl $TRAP_syscall,4(%rsp) SAVE_ALL GET_CURRENT(%rbx) + movq VCPU_domain(%rbx),%rcx + testb $1,DOMAIN_is_32bit_pv(%rcx) + jnz compat_syscall testb $TF_kernel_mode,VCPU_thread_flags(%rbx) jz switch_to_kernel @@ -224,6 +231,41 @@ bad_hypercall: movq $-ENOSYS,UREGS_rax(%rsp) jmp test_all_events +ENTRY(sysenter_entry) + sti + pushq $FLAT_USER_SS + pushq $0 + pushfq + pushq $0 + pushq $0 + pushq $...