Public bug reported:
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
0c1d77f4ba5cc9c05a29adca3d6466cdf4969b70:
KVM: x86: fix conversion of addresses to linear in 32-bit protected mode
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.
Fixes: e8dd2d2d641cb2724ee10e76c0ad02e04289c017
Cc: [email protected]
Reported-by: Aurelien Jarno <[email protected]>
Tested-by: Aurelien Jarno <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
** Affects: linux (Ubuntu)
Importance: High
Assignee: Colin Ian King (colin-king)
Status: In Progress
** Changed in: linux (Ubuntu)
Status: New => In Progress
** Changed in: linux (Ubuntu)
Importance: Undecided => High
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Colin Ian King (colin-king)
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https://bugs.launchpad.net/bugs/1550596
Title:
kvm fails to boot GNU Hurd kernels with 4.4 Xenial kernel
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