Commit 3e47c249 authored by Orit Wasserman's avatar Orit Wasserman Committed by Juan Quintela
Browse files

Fix real mode guest segments dpl value in savevm 



Older KVM version put invalid value in the segments registers dpl field for
real mode guests (0x3).
This breaks migration from those hosts to hosts with unrestricted guest support.
We detect it by checking CS dpl value for real mode guest and fix the dpl values
of all the segment registers.

Signed-off-by: default avatarOrit Wasserman <owasserm@redhat.com>
Reviewed-by: default avatarJuan Quintela <quintela@redhat.com>
Signed-off-by: default avatarJuan Quintela <quintela@redhat.com>
parent 444ba679

target-i386/machine.c

+18 −0
Original line number Diff line number Diff line
@@ -252,6 +252,24 @@ static void cpu_pre_save(void *opaque) 
    }



    env->fpregs_format_vmstate = 0;



    /*

     * Real mode guest segments register DPL should be zero.

     * Older KVM version were setting it wrongly.

     * Fixing it will allow live migration to host with unrestricted guest

     * support (otherwise the migration will fail with invalid guest state

     * error).

     */

    if (!(env->cr[0] & CR0_PE_MASK) &&

        (env->segs[R_CS].flags >> DESC_DPL_SHIFT & 3) != 0) {

        env->segs[R_CS].flags &= ~(env->segs[R_CS].flags & DESC_DPL_MASK);

        env->segs[R_DS].flags &= ~(env->segs[R_DS].flags & DESC_DPL_MASK);

        env->segs[R_ES].flags &= ~(env->segs[R_ES].flags & DESC_DPL_MASK);

        env->segs[R_FS].flags &= ~(env->segs[R_FS].flags & DESC_DPL_MASK);

        env->segs[R_GS].flags &= ~(env->segs[R_GS].flags & DESC_DPL_MASK);

        env->segs[R_SS].flags &= ~(env->segs[R_SS].flags & DESC_DPL_MASK);

    }



}



static int cpu_post_load(void *opaque, int version_id)