Re: [Xen-devel] Xen fails to boot inside QEMU on x86, no VMX

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 23/01/2018 00:38, Stefano Stabellini wrote:
> On Tue, 23 Jan 2018, Andrew Cooper wrote:
>> On 22/01/2018 23:48, Stefano Stabellini wrote:
>>> Hi all,
>>>
>>> Running Xen inside QEMU x86 without KVM acceleartion and without VMX
>>> emulation leads to the failure appended below.
>>>
>>> This trivial workaround "fixes" the problem:
>>>
>>> diff --git a/xen/arch/x86/extable.c b/xen/arch/x86/extable.c
>>> index 72f30d9..a67d6c1 100644
>>> --- a/xen/arch/x86/extable.c
>>> +++ b/xen/arch/x86/extable.c
>>> @@ -168,7 +168,6 @@ static int __init stub_selftest(void)
>>>                         _ASM_EXTABLE(.Lret%=, .Lfix%=)
>>>                         : [exn] "+m" (res)
>>>                         : [stb] "r" (addr), "a" (tests[i].rax));
>>> -        ASSERT(res == tests[i].res.raw);
>>>      }
>>>  
>>>      return 0;
>>>
>>>
>>> Any suggestions?
>> Which i failed?  This will probably be an emulation bug in Qemu.
> i=2 is the culprit

Qemu doesn't emulate %rsp-based memory accesses properly.  It should
raise #SS[0], and is presumably raising #GP[0] instead.

~Andrew

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