Finally had time this week to look at memory sharing between domains.
Here is a balloon driver patch for xenolinux. Inflation and deflation
no longer crash the guest os. I'm not a Linux vm system expert so some
of this is guesswork.
David
***
../../xeno-unstable.bk/linux-2.4.26-xen-sparse//arch/xen/drivers/balloon/balloon.c
Tue Jun 22 09:58:19 2004
--- linux-xen-sparse/arch/xen/drivers/balloon/balloon.c Wed Jun 30 09:32:40 2004
***************
*** 17,22 ****
--- 17,23 ----
#include <linux/mman.h>
#include <linux/smp_lock.h>
#include <linux/pagemap.h>
+ #include <linux/vmalloc.h>
#include <asm/hypervisor.h>
#include <asm/pgalloc.h>
***************
*** 64,77 ****
unsigned long vaddr;
unsigned long i, j;
! parray = (unsigned long *)kmalloc(num_pages * sizeof(unsigned long),
! GFP_KERNEL);
currp = parray;
for ( i = 0; i < num_pages; i++ )
{
/* Try to obtain a free page (has to be done with GFP_ATOMIC). */
! vaddr = __get_free_page(GFP_ATOMIC);
/* If allocation fails then free all reserved pages. */
if ( vaddr == 0 )
--- 65,82 ----
unsigned long vaddr;
unsigned long i, j;
! parray = (unsigned long *)vmalloc(num_pages * sizeof(unsigned long));
! if (!parray)
! {
! printk("inflate_balloon: Unable to vmalloc parray\n");
! return 0;
! }
currp = parray;
for ( i = 0; i < num_pages; i++ )
{
/* Try to obtain a free page (has to be done with GFP_ATOMIC). */
! vaddr = __get_free_page(GFP_KERNEL);
/* If allocation fails then free all reserved pages. */
if ( vaddr == 0 )
***************
*** 113,119 ****
ret = num_pages;
cleanup:
! kfree(parray);
return ret;
}
--- 119,125 ----
ret = num_pages;
cleanup:
! vfree(parray);
return ret;
}
***************
*** 143,150 ****
if ( phys_to_machine_mapping[i] == DEAD )
{
phys_to_machine_mapping[i] = *curr;
! queue_l1_entry_update(
! (pte_t *)((i << PAGE_SHIFT) | MMU_MACHPHYS_UPDATE), i);
queue_l1_entry_update(
get_ptep((unsigned long)__va(i << PAGE_SHIFT)),
((*curr) << PAGE_SHIFT) | pgprot_val(PAGE_KERNEL));
--- 149,155 ----
if ( phys_to_machine_mapping[i] == DEAD )
{
phys_to_machine_mapping[i] = *curr;
! queue_machphys_update(*curr, i);
queue_l1_entry_update(
get_ptep((unsigned long)__va(i << PAGE_SHIFT)),
((*curr) << PAGE_SHIFT) | pgprot_val(PAGE_KERNEL));
***************
*** 181,188 ****
return -EAGAIN;
}
! parray = (unsigned long *)kmalloc(num_pages * sizeof(unsigned long),
! GFP_KERNEL);
ret = HYPERVISOR_dom_mem_op(MEMOP_increase_reservation,
parray, num_pages);
--- 186,198 ----
return -EAGAIN;
}
! parray = (unsigned long *)vmalloc(num_pages * sizeof(unsigned long));
! if (!parray)
! {
! printk("deflate_balloon: Unable to vmalloc parray\n");
! return 0;
! }
! XEN_flush_page_update_queue();
ret = HYPERVISOR_dom_mem_op(MEMOP_increase_reservation,
parray, num_pages);
***************
*** 203,209 ****
credit -= num_pages;
cleanup:
! kfree(parray);
return ret;
}
--- 213,219 ----
credit -= num_pages;
cleanup:
! vfree(parray);
return ret;
}
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