# HG changeset patch
# User Jimi Xenidis <jimix@xxxxxxxxxxxxxx>
# Node ID a60e804c0a316037079a7e693f8561b4c28265ea
# Parent b0293bc598358a7850fd397eea1301a907669830
[XEN][POWERPC] The VIO rewrite
Once you figure it all out, its time to do a rewrite, lots of code I
thougth I needed is now removed and less PPC specific code now exists.
This patch uses the MEMORY_HOTPLUG system to add a region to the
Kernel Linear Mapping that will be used exclusively to map in
Granted/Foreign pages. This creates "struct page" objects in Linux
which are necessary to perform VIO operations. When one of these
pages are grant_mapped the pfn2mfn() translation in Xen is updated to
reflect the association and the subsequent H_ENTER() from the domain
will contain the correct mapping.
Signed-off-by: Jimi Xenidis <jimix@xxxxxxxxxxxxxx>
Signed-off-by: Hollis Blanchard <hollisb@xxxxxxxxxx>
---
xen/arch/powerpc/domain.c | 7 +++++++
xen/arch/powerpc/mm.c | 24 +++++++++++++++++++++++-
xen/arch/powerpc/ofd_fixup.c | 2 +-
xen/include/asm-powerpc/domain.h | 3 +++
xen/include/asm-powerpc/grant_table.h | 4 ----
5 files changed, 34 insertions(+), 6 deletions(-)
diff -r b0293bc59835 -r a60e804c0a31 xen/arch/powerpc/domain.c
--- a/xen/arch/powerpc/domain.c Tue Oct 24 19:11:00 2006 -0400
+++ b/xen/arch/powerpc/domain.c Fri Nov 03 16:53:17 2006 -0500
@@ -88,6 +88,12 @@ int arch_domain_create(struct domain *d)
INIT_LIST_HEAD(&d->arch.extent_list);
+ d->arch.foreign_mfn_count = 1024;
+ d->arch.foreign_mfns = xmalloc_array(uint, d->arch.foreign_mfn_count);
+ BUG_ON(d->arch.foreign_mfns == NULL);
+
+ memset(d->arch.foreign_mfns, -1, d->arch.foreign_mfn_count * sizeof(uint));
+
return 0;
}
@@ -294,6 +300,7 @@ void domain_relinquish_resources(struct
relinquish_memory(d, &d->xenpage_list);
relinquish_memory(d, &d->page_list);
free_extents(d);
+ xfree(d->arch.foreign_mfns);
return;
}
diff -r b0293bc59835 -r a60e804c0a31 xen/arch/powerpc/mm.c
--- a/xen/arch/powerpc/mm.c Tue Oct 24 19:11:00 2006 -0400
+++ b/xen/arch/powerpc/mm.c Fri Nov 03 16:53:17 2006 -0500
@@ -93,6 +93,26 @@ void share_xen_page_with_privileged_gues
unimplemented();
}
+static ulong foreign_to_mfn(struct domain *d, ulong pfn)
+{
+
+ pfn -= 1UL << cpu_foreign_map_order();
+
+ BUG_ON(pfn >= d->arch.foreign_mfn_count);
+
+ return d->arch.foreign_mfns[pfn];
+}
+
+static int set_foreign(struct domain *d, ulong pfn, ulong mfn)
+{
+ pfn -= 1UL << cpu_foreign_map_order();
+
+ BUG_ON(pfn >= d->arch.foreign_mfn_count);
+ d->arch.foreign_mfns[pfn] = mfn;
+
+ return 0;
+}
+
static int create_grant_va_mapping(
unsigned long va, unsigned long frame, struct vcpu *v)
{
@@ -101,6 +121,7 @@ static int create_grant_va_mapping(
BUG();
return GNTST_permission_denied;
}
+ set_foreign(v->domain, va >> PAGE_SHIFT, frame);
return GNTST_okay;
}
@@ -112,6 +133,7 @@ static int destroy_grant_va_mapping(
BUG();
return GNTST_permission_denied;
}
+ set_foreign(d, addr >> PAGE_SHIFT, ~0UL);
return GNTST_okay;
}
@@ -388,7 +410,7 @@ ulong pfn2mfn(struct domain *d, ulong pf
/* quick tests first */
if (pfn & foreign_map_pfn) {
t = PFN_TYPE_FOREIGN;
- mfn = pfn & ~(foreign_map_pfn);
+ mfn = foreign_to_mfn(d, pfn);
} else if (pfn >= max_page && pfn < (max_page + NR_GRANT_FRAMES)) {
/* Its a grant table access */
t = PFN_TYPE_GNTTAB;
diff -r b0293bc59835 -r a60e804c0a31 xen/arch/powerpc/ofd_fixup.c
--- a/xen/arch/powerpc/ofd_fixup.c Tue Oct 24 19:11:00 2006 -0400
+++ b/xen/arch/powerpc/ofd_fixup.c Fri Nov 03 16:53:17 2006 -0500
@@ -354,7 +354,7 @@ static ofdn_t ofd_xen_props(void *m, str
/* tell dom0 where ranted pages go in the linear map */
val[0] = cpu_foreign_map_order();
- val[1] = max_page;
+ val[1] = d->arch.foreign_mfn_count;
ofd_prop_add(m, n, "foreign-map", val, sizeof (val));
n = ofd_node_add(m, n, console, sizeof (console));
diff -r b0293bc59835 -r a60e804c0a31 xen/include/asm-powerpc/domain.h
--- a/xen/include/asm-powerpc/domain.h Tue Oct 24 19:11:00 2006 -0400
+++ b/xen/include/asm-powerpc/domain.h Fri Nov 03 16:53:17 2006 -0500
@@ -40,6 +40,9 @@ struct arch_domain {
/* list of extents beyond RMA */
struct list_head extent_list;
+
+ uint foreign_mfn_count;
+ uint *foreign_mfns;
/* I/O-port access bitmap mask. */
u8 *iobmp_mask; /* Address of IO bitmap mask, or NULL. */
diff -r b0293bc59835 -r a60e804c0a31 xen/include/asm-powerpc/grant_table.h
--- a/xen/include/asm-powerpc/grant_table.h Tue Oct 24 19:11:00 2006 -0400
+++ b/xen/include/asm-powerpc/grant_table.h Fri Nov 03 16:53:17 2006 -0500
@@ -69,8 +69,4 @@ static inline uint cpu_foreign_map_order
/* 16 GiB */
return 34 - PAGE_SHIFT;
}
-
-#define GNTTAB_DEV_BUS(f) \
- ((f) | (1UL << (cpu_foreign_map_order() + PAGE_SHIFT)))
-
#endif /* __ASM_PPC_GRANT_TABLE_H__ */
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