https://bugzilla.kernel.org/show_bug.cgi?id=65561 --- Comment #22 from Jidong Xiao <jidong.xiao@xxxxxxxxx> --- Alright, I added a printk statement in the wrmsr case, like this: case 0x30: printk(KERN_ERR "DEBUG: Passed %s %d \n",__FUNCTION__,__LINE__); /* wrmsr */ msr_data = (u32)c->regs[VCPU_REGS_RAX] | ((u64)c->regs[VCPU_REGS_RDX] << 32); rc = kvm_set_msr(ctxt->vcpu, c->regs[VCPU_REGS_RCX], msr_data); if (rc) { kvm_inject_gp(ctxt->vcpu, 0); c->eip = kvm_rip_read(ctxt->vcpu); } rc = X86EMUL_CONTINUE; c->dst.type = OP_NONE; break; And i run a c program to access msr, like this: linux:~/code/cvedr # cat accessmsr.c #include <stdio.h> main(){ asm volatile("wrmsr"); printf("test msr\n"); } linux:~/code/cvedr # ./accessmsr Segmentation fault Even though my c program in the guest os got a segmentation fault, from the host os level, I don't see the printk statement is triggered, so this is not about privileged instructions or unprivileged instructions. I think there must be some other conditions to trigger these printk statements. -- 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
