Messages in this thread | | | Subject | Re: [RFC v2-fix-v2 2/2] x86/tdx: Handle in-kernel MMIO | From | Andi Kleen <> | Date | Wed, 2 Jun 2021 14:01:26 -0700 |
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User-space > access triggers SIGBUS.
Actually it looks like it's implemented below now, so that sentence could be dropped.
> + > + if (user_mode(regs)) { > + ret = insn_fetch_from_user(regs, buffer); > + if (!ret) > + return -EFAULT; > + if (!insn_decode_from_regs(&insn, regs, buffer, ret)) > + return -EFAULT; > + } else { > + ret = copy_from_kernel_nofault(buffer, (void *)regs->ip, > + MAX_INSN_SIZE); > + if (ret) > + return -EFAULT; > + insn_init(&insn, buffer, MAX_INSN_SIZE, 1); > + insn_get_length(&insn); > + } > +
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