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[Bug 1550596] Re: kvm fails to boot GNU Hurd kernels with 4.4 Xenial kernel
** Also affects: linux (Ubuntu Xenial)
Assignee: Colin Ian King (colin-king)
Status: In Progress
** Changed in: linux (Ubuntu Xenial)
Status: In Progress => Fix Committed
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kvm fails to boot GNU Hurd kernels with 4.4 Xenial kernel
Status in linux package in Ubuntu:
Status in linux source package in Xenial:
Since 4.4, I have not been able to boot GNU Hurd Kernels using KVM
QEMU. I tracked this regression down to commit e8dd2d2d641c ("Silence
compiler warning in arch/x86/kvm/emulate.c", 2015-09-06)
This has been recently fixed with upstream commit
KVM: x86: fix conversion of addresses to linear in 32-bit protected
Commit e8dd2d2d641c ("Silence compiler warning in arch/x86/kvm/emulate.c",
2015-09-06) broke boot of the Hurd. The bug is that the "default:"
case actually could modify "la", but after the patch this change is
not reflected in *linear.
The bug is visible whenever a non-zero segment base causes the linear
address to wrap around the 4GB mark.
Reported-by: Aurelien Jarno <aurelien@xxxxxxxxxxx>
Tested-by: Aurelien Jarno <aurelien@xxxxxxxxxxx>
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
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