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VM: undo actions after live-update rollback

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During live update, the new instance of VM may make changes that,
after a rollback, have to be undone by the old instance of VM, in
particular because both instances share (read-write) all dynamically
allocated pages.

Change-Id: I2bcfa8e627ca6084b1991e0af7cccecc683894a2
This commit is contained in:
David van Moolenbroek 2015-07-14 06:44:35 +02:00
parent 40aba308a0
commit 5a4672e300
1 changed files with 26 additions and 0 deletions
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26
minix/servers/vm/main.c
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@ -194,6 +194,29 @@ int main(void)
return(OK); return(OK);
} }
static void sef_cb_lu_state_changed(int old_state, int state)
{
/* Called whenever the live-update state changes. We need to restore certain
* state in the old VM instance after a live update has failed, because some
* but not all memory is shared between the two VM instances.
*/
struct vmproc *vmp;
if (state == SEF_LU_STATE_NULL) {
/* Undo some of the changes that may have been made by the new VM
* instance. If the new VM instance is us, nothing happens.
*/
vmp = &vmproc[VM_PROC_NR];
/* Rebind page tables. */
pt_bind(&vmp->vm_pt, vmp);
pt_clearmapcache();
/* Readjust process references. */
adjust_proc_refs();
}
}
static void sef_local_startup(void) static void sef_local_startup(void)
{ {
/* Register init callbacks. */ /* Register init callbacks. */
@ -206,6 +229,9 @@ static void sef_local_startup(void)
if (__vm_init_fresh) if (__vm_init_fresh)
sef_setcb_init_response(sef_cb_init_response_rs_asyn_once); sef_setcb_init_response(sef_cb_init_response_rs_asyn_once);
/* Register live update callbacks. */
sef_setcb_lu_state_changed(sef_cb_lu_state_changed);
/* Register signal callbacks. */ /* Register signal callbacks. */
sef_setcb_signal_handler(sef_cb_signal_handler); sef_setcb_signal_handler(sef_cb_signal_handler);