"Michael S. Tsirkin" <m...@redhat.com> writes: > QEMU 1.3 does not emulate the link auto negotiation, so if migrate to a > 1.3 machine during link auto negotiation, the guest link will be set to down. > Fix this by just disabling auto negotiation for 1.3. > > Signed-off-by: Michael S. Tsirkin <m...@redhat.com> > --- > hw/e1000.c | 25 +++++++++++++++++++++++++ > hw/pc_piix.c | 4 ++++ > 2 files changed, 29 insertions(+) > > diff --git a/hw/e1000.c b/hw/e1000.c > index d6fe815..263f2f4 100644 > --- a/hw/e1000.c > +++ b/hw/e1000.c > @@ -131,6 +131,11 @@ typedef struct E1000State_st { > } eecd_state; > > QEMUTimer *autoneg_timer; > + > +/* Enabled compatibility for migration to/from rhel6.3.0 and older */
I presume you mean QEMU 1.3... > +#define E1000_FLAG_QEMU_13_BIT 0 > +#define E1000_FLAG_QEMU_13 (1 << E1000_FLAG_QEMU_13_BIT) > + uint32_t compat_flags; > } E1000State; > > #define defreg(x) x = (E1000_##x>>2) > @@ -165,6 +170,14 @@ e1000_link_up(E1000State *s) > static void > set_phy_ctrl(E1000State *s, int index, uint16_t val) > { > + /* > + * QEMU 1.3 does not support link auto-negotiation emulation, so if we > + * migrate during auto negotiation, after migration the link will be > + * down. > + */ > + if (s->compat_flags & E1000_FLAG_QEMU_13) { > + return; > + } > if ((val & MII_CR_AUTO_NEG_EN) && (val & MII_CR_RESTART_AUTO_NEG)) { > e1000_link_down(s); > s->phy_reg[PHY_STATUS] &= ~MII_SR_AUTONEG_COMPLETE; > @@ -1120,6 +1133,11 @@ static void e1000_pre_save(void *opaque) > { > E1000State *s = opaque; > NetClientState *nc = qemu_get_queue(s->nic); > + > + if (s->compat_flags & E1000_FLAG_QEMU_13) { > + return; > + } > + > /* > * If link is down and auto-negotiation is ongoing, complete > * auto-negotiation immediately. This allows is to look at > @@ -1141,6 +1159,11 @@ static int e1000_post_load(void *opaque, int > version_id) > * to link status bit in mac_reg[STATUS]. > * Alternatively, restart link negotiation if it was in progress. */ > nc->link_down = (s->mac_reg[STATUS] & E1000_STATUS_LU) == 0; > + > + if (s->compat_flags & E1000_FLAG_QEMU_13) { > + return 0; > + } > + > if (s->phy_reg[PHY_CTRL] & MII_CR_AUTO_NEG_EN && > s->phy_reg[PHY_CTRL] & MII_CR_RESTART_AUTO_NEG && > !(s->phy_reg[PHY_STATUS] & MII_SR_AUTONEG_COMPLETE)) { > @@ -1343,6 +1366,8 @@ static void qdev_e1000_reset(DeviceState *dev) > > static Property e1000_properties[] = { > DEFINE_NIC_PROPERTIES(E1000State, conf), > + DEFINE_PROP_BIT("x-qemu_13_compat", E1000State, > + compat_flags, E1000_FLAG_QEMU_13, false), > DEFINE_PROP_END_OF_LIST(), Would it make more sense to simply call this auto-negotiation? Regards, Anthony Liguori > }; > > diff --git a/hw/pc_piix.c b/hw/pc_piix.c > index ba09714..89a3f1f 100644 > --- a/hw/pc_piix.c > +++ b/hw/pc_piix.c > @@ -537,6 +537,10 @@ static QEMUMachine pc_machine_v0_13 = { > .driver = "vmware-svga", > .property = "rombar", > .value = stringify(0), > + },{ > + .driver = "e1000", > + .property = "x-qemu_13_compat", > + .value = "on", > }, > { /* end of list */ } > }, > -- > MST