# HG changeset patch
# User Ian Campbell <ian.campbell@xxxxxxxxxx>
# Date 1286892402 -3600
# Node ID 91597ec2218db759eef6916dec73ea42560c1504
# Parent 400adff91720efab6413ad73bba8329c715f58ba
libxc: make do_memory_op's callers responsible for locking indirect buffers
Push responsibility for locking buffers refered to by the memory_op
argument up into the callers (which are now all internal to libxc).
This removes the last of the introspecation from do_memory_op and
generally makes the transistion to hypercall buffers smoother.
Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
diff -r 400adff91720 -r 91597ec2218d tools/libxc/xc_domain.c
--- a/tools/libxc/xc_domain.c Tue Oct 12 15:06:42 2010 +0100
+++ b/tools/libxc/xc_domain.c Tue Oct 12 15:06:42 2010 +0100
@@ -599,9 +599,18 @@ int xc_domain_increase_reservation(xc_in
};
/* may be NULL */
+ if ( extent_start && lock_pages(xch, extent_start, nr_extents *
sizeof(xen_pfn_t)) != 0 )
+ {
+ PERROR("Could not lock memory for XENMEM_increase_reservation
hypercall");
+ return -1;
+ }
+
set_xen_guest_handle(reservation.extent_start, extent_start);
err = do_memory_op(xch, XENMEM_increase_reservation, &reservation,
sizeof(reservation));
+
+ if ( extent_start )
+ unlock_pages(xch, extent_start, nr_extents * sizeof(xen_pfn_t));
return err;
}
@@ -647,7 +656,11 @@ int xc_domain_decrease_reservation(xc_in
.domid = domid
};
- set_xen_guest_handle(reservation.extent_start, extent_start);
+ if ( lock_pages(xch, extent_start, nr_extents * sizeof(xen_pfn_t)) != 0 )
+ {
+ PERROR("Could not lock memory for XENMEM_decrease_reservation
hypercall");
+ return -1;
+ }
if ( extent_start == NULL )
{
@@ -656,7 +669,11 @@ int xc_domain_decrease_reservation(xc_in
return -1;
}
+ set_xen_guest_handle(reservation.extent_start, extent_start);
+
err = do_memory_op(xch, XENMEM_decrease_reservation, &reservation,
sizeof(reservation));
+
+ unlock_pages(xch, extent_start, nr_extents * sizeof(xen_pfn_t));
return err;
}
@@ -715,9 +732,18 @@ int xc_domain_populate_physmap(xc_interf
.mem_flags = mem_flags,
.domid = domid
};
+
+ if ( lock_pages(xch, extent_start, nr_extents * sizeof(xen_pfn_t)) != 0 )
+ {
+ PERROR("Could not lock memory for XENMEM_populate_physmap hypercall");
+ return -1;
+ }
+
set_xen_guest_handle(reservation.extent_start, extent_start);
err = do_memory_op(xch, XENMEM_populate_physmap, &reservation,
sizeof(reservation));
+
+ unlock_pages(xch, extent_start, nr_extents * sizeof(xen_pfn_t));
return err;
}
diff -r 400adff91720 -r 91597ec2218d tools/libxc/xc_private.c
--- a/tools/libxc/xc_private.c Tue Oct 12 15:06:42 2010 +0100
+++ b/tools/libxc/xc_private.c Tue Oct 12 15:06:42 2010 +0100
@@ -424,9 +424,6 @@ int do_memory_op(xc_interface *xch, int
int do_memory_op(xc_interface *xch, int cmd, void *arg, size_t len)
{
DECLARE_HYPERCALL;
- struct xen_memory_reservation *reservation = arg;
- struct xen_machphys_mfn_list *xmml = arg;
- xen_pfn_t *extent_start;
long ret = -EINVAL;
hypercall.op = __HYPERVISOR_memory_op;
@@ -439,68 +436,10 @@ int do_memory_op(xc_interface *xch, int
goto out1;
}
- switch ( cmd )
- {
- case XENMEM_increase_reservation:
- case XENMEM_decrease_reservation:
- case XENMEM_populate_physmap:
- get_xen_guest_handle(extent_start, reservation->extent_start);
- if ( (extent_start != NULL) &&
- (lock_pages(xch, extent_start,
- reservation->nr_extents * sizeof(xen_pfn_t)) != 0) )
- {
- PERROR("Could not lock");
- unlock_pages(xch, reservation, sizeof(*reservation));
- goto out1;
- }
- break;
- case XENMEM_machphys_mfn_list:
- get_xen_guest_handle(extent_start, xmml->extent_start);
- if ( lock_pages(xch, extent_start,
- xmml->max_extents * sizeof(xen_pfn_t)) != 0 )
- {
- PERROR("Could not lock");
- unlock_pages(xch, xmml, sizeof(*xmml));
- goto out1;
- }
- break;
- case XENMEM_add_to_physmap:
- case XENMEM_current_reservation:
- case XENMEM_maximum_reservation:
- case XENMEM_maximum_gpfn:
- case XENMEM_set_pod_target:
- case XENMEM_get_pod_target:
- break;
- }
-
ret = do_xen_hypercall(xch, &hypercall);
if ( len )
unlock_pages(xch, arg, len);
-
- switch ( cmd )
- {
- case XENMEM_increase_reservation:
- case XENMEM_decrease_reservation:
- case XENMEM_populate_physmap:
- get_xen_guest_handle(extent_start, reservation->extent_start);
- if ( extent_start != NULL )
- unlock_pages(xch, extent_start,
- reservation->nr_extents * sizeof(xen_pfn_t));
- break;
- case XENMEM_machphys_mfn_list:
- get_xen_guest_handle(extent_start, xmml->extent_start);
- unlock_pages(xch, extent_start,
- xmml->max_extents * sizeof(xen_pfn_t));
- break;
- case XENMEM_add_to_physmap:
- case XENMEM_current_reservation:
- case XENMEM_maximum_reservation:
- case XENMEM_maximum_gpfn:
- case XENMEM_set_pod_target:
- case XENMEM_get_pod_target:
- break;
- }
out1:
return ret;
@@ -534,11 +473,23 @@ int xc_machphys_mfn_list(xc_interface *x
struct xen_machphys_mfn_list xmml = {
.max_extents = max_extents,
};
+
+ if ( lock_pages(xch, extent_start, max_extents * sizeof(xen_pfn_t)) != 0 )
+ {
+ PERROR("Could not lock memory for XENMEM_machphys_mfn_list hypercall");
+ return -1;
+ }
+
set_xen_guest_handle(xmml.extent_start, extent_start);
rc = do_memory_op(xch, XENMEM_machphys_mfn_list, &xmml, sizeof(xmml));
if (rc || xmml.nr_extents != max_extents)
- return -1;
- return 0;
+ rc = -1;
+ else
+ rc = 0;
+
+ unlock_pages(xch, extent_start, max_extents * sizeof(xen_pfn_t));
+
+ return rc;
}
#ifndef __ia64__
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