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KVM: Add compat ioctl for KVM_SET_SIGNAL_MASK

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KVM has an ioctl to define which signal mask should be used while running
inside VCPU_RUN. At least for big endian systems, this mask is different
on 32-bit and 64-bit systems (though the size is identical).

Add a compat wrapper that converts the mask to whatever the kernel accepts,
allowing 32-bit kvm user space to set signal masks.

This patch fixes qemu with --enable-io-thread on ppc64 hosts when running
32-bit user land.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Alexander Graf
2011-06-08 02:45:37 +02:00
committed by Avi Kivity
parent 91e3d71db2
commit 1dda606c5f
2 changed files with 52 additions and 1 deletions
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kernel/compat.c
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@@ -890,6 +890,7 @@ sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
}
}
EXPORT_SYMBOL_GPL(sigset_from_compat);
asmlinkage long
compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,