https://bugzilla.kernel.org/show_bug.cgi?id=65561 --- Comment #18 from Jidong Xiao <jidong.xiao@xxxxxxxxx> --- Hi, Paolo, I am still reading the source code so as to understand the root cause of this problem. In particular, I added some printk statements in x86_emulate_insn(). For example, I added the following printk statement. ... switch (c->b) { case 0x00 ... 0x05: printk(KERN_ERR "DEBUG: Passed %s %d \n",__FUNCTION__,__LINE__); add: /* add */ emulate_2op_SrcV("add", c->src, c->dst, ctxt->eflags); break; ... And then in the guest OS, I run a c program like this: linux:~/code/testc # cat test.c #include <stdio.h> int main(void) { int foo = 10, bar = 15; __asm__ __volatile__("add %%ebx,%%eax" :"=a"(foo) :"a"(foo), "b"(bar) ); printf("foo+bar=%d\n", foo); return 0; } I thought that because I am using the "add" instruction, the printk statement in the host os kernel should be invoked, however, my experimental result prove it's untrue. So I am totally confused with this kvm emulator. If the kvm trying to emulate these instructions, why that, when I run these instructions in the guest, the corresponding emulate code are not invoked? So how to trigger this printk statement? Thanks. -- You are receiving this mail because: You are watching the assignee of the bug. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
