** Changed in: qemu
Status: New => Invalid
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https://bugs.launchpad.net/bugs/629791
Title:
sysret sets invalid ss
Status in QEMU:
Invalid
Bug description:
I'm developing an OS. I use only sysret to enter user space. When an
interrupt occurred, it would GPF on iretq'ing from it. On
investigating, the cs on the stack is 0x2b (valid and correct). The ss
on the stack is 0x20, which has a rpl of 0 which is incorrect. iretq
checks that and gpf's. Making the irq handler manually modify it to
0x23 fixes it locally.
This happens on the non-kvm'ed qemu. I haven't tried the kvm'ed one.
Qemu version 0.12.5. I haven't tried with the current development
version either.
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