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| author |   mikeb <mikeb@openbsd.org> | 2015-12-08 22:18:21 +0000 |
|---|---|---|
| committer | mikeb <mikeb@openbsd.org> | 2015-12-08 22:18:21 +0000 |
| commit | 3d9f0c1184746e9eae16651789586c175b72a0fb (patch) | |
| tree | dfaaa8024d57d095d9f98c1017ffdaf51c2d6366 | |
| parent | Driver for XenStore, the configuration storage (diff) | |
| download | wireguard-openbsd-3d9f0c1184746e9eae16651789586c175b72a0fb.tar.xz wireguard-openbsd-3d9f0c1184746e9eae16651789586c175b72a0fb.zip | |
Implement a function to detach emulated devices (such as an em(4)
network interface) in order to attach a paravirtualized drivers
(such as Xen Netfront).
OK mlarkin
| -rw-r--r-- | sys/dev/pv/xen.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/sys/dev/pv/xen.c b/sys/dev/pv/xen.c index d9ac1bc33a5..63f8c2825f1 100644 --- a/sys/dev/pv/xen.c +++ b/sys/dev/pv/xen.c @@ -41,6 +41,7 @@ int xen_getfeatures(struct xen_softc *); int xen_init_info_page(struct xen_softc *); int xen_init_cbvec(struct xen_softc *); int xen_init_interrupts(struct xen_softc *); +void xen_disable_emulated_devices(struct xen_softc *); int xen_match(struct device *, void *, void *); void xen_attach(struct device *, struct device *, void *); @@ -103,6 +104,8 @@ xen_attach(struct device *parent, struct device *self, void *aux) if (xs_attach(sc)) return; + xen_disable_emulated_devices(sc); + mountroothook_establish(xen_deferred, sc); } @@ -700,3 +703,36 @@ xen_intr_enable(void) } } } + +#include <machine/pio.h> + +#define XMI_PORT 0x10 +#define XMI_MAGIC 0x49d2 +#define XMI_UNPLUG_IDE 0x01 +#define XMI_UNPLUG_NIC 0x02 +#define XMI_UNPLUG_IDESEC 0x04 + +int xen_disable_pv_ide, xen_disable_pv_idesec, xen_disable_pv_nic; + +void +xen_disable_emulated_devices(struct xen_softc *sc) +{ +#if defined(__i386__) || defined(__amd64__) + ushort unplug = 0; + + if (inw(XMI_PORT) != XMI_MAGIC) { + printf("%s: no magic!\n", sc->sc_dev.dv_xname); + return; + } + if (xen_disable_pv_ide) + unplug |= XMI_UNPLUG_IDE; + if (xen_disable_pv_idesec) + unplug |= XMI_UNPLUG_IDESEC; + if (xen_disable_pv_nic) + unplug |= XMI_UNPLUG_NIC; + if (unplug) { + outw(XMI_PORT, unplug); + DPRINTF("%s: disabled emulated devices\n", sc->sc_dev.dv_xname); + } +#endif /* __i386__ || __amd64__ */ +} |