[XenPPC] [PATCH 3 of 6] [PATCH] xen: implement guest_physmap_max_mem for ppc

[Ryan Harper <ryanh@xxxxxxxxxx>]

4 files changed, 72 insertions(+)
xen/arch/powerpc/domain.c        |   60 ++++++++++++++++++++++++++++++++++++++
xen/arch/powerpc/domain_build.c  |    5 +++
xen/include/asm-powerpc/domain.h |    3 +
xen/include/asm-powerpc/shadow.h |    4 ++


# HG changeset patch
# User Ryan Harper <ryanh@xxxxxxxxxx>
# Date 1172103252 21600
# Node ID 35fd77200dff7e73fe3959b5dbfa6088c691c502
# Parent  84ec1b4d5cd50cc9d49202eb978a4715c4780e28
[PATCH] xen: implement guest_physmap_max_mem for ppc

Signed-off-by: Ryan Harper <ryanh@xxxxxxxxxx>

diff -r 84ec1b4d5cd5 -r 35fd77200dff xen/arch/powerpc/domain.c
--- a/xen/arch/powerpc/domain.c Wed Feb 21 18:14:12 2007 -0600
+++ b/xen/arch/powerpc/domain.c Wed Feb 21 18:14:12 2007 -0600
@@ -33,6 +33,7 @@
 #include <asm/htab.h>
 #include <asm/current.h>
 #include <asm/hcalls.h>
+#include <asm/shadow.h>
 #include "rtas.h"
 #include "exceptions.h"
 
@@ -347,3 +348,62 @@ void idle_loop(void)
         do_softirq();
     }
 }
+
+int do_guest_physmap_max_mem(struct domain *d, unsigned long new_max)
+{
+    ulong *p2m_array = NULL;
+    ulong *p2m_old = NULL;
+    ulong p2m_pages;
+    ulong copy_end = 0;
+
+    /* we don't handle shrinking max_pages */
+    if ( new_max < d->max_pages )
+    {
+        printk("Can't shrink %d max_mem\n", d->domain_id);
+        return -EINVAL;
+    }
+
+    /* our work is done here */
+    if ( new_max == d->max_pages )
+        return 0;
+
+    /* check new_max pages is 16MiB aligned */
+    if ( new_max & ((1<<12)-1) )
+    {
+        printk("Must be 16MiB aligned increments\n");
+        return -EACCES;
+    }
+
+    /* make a p2m array of new_max mfns */
+    p2m_pages = (new_max * sizeof(ulong)) >> PAGE_SHIFT;
+    /* XXX: could use domheap anonymously */
+    p2m_array = alloc_xenheap_pages(get_order_from_pages(p2m_pages));
+    if ( p2m_array == NULL )
+        return -ENOMEM;
+
+    /* copy old mappings into new array if any */
+    if ( d->arch.p2m != NULL )
+    {
+        /* mark where the copy will stop (which page) */
+        copy_end = d->max_pages;
+
+        /* memcpy takes size in bytes */
+        memcpy(p2m_array, d->arch.p2m, (d->max_pages * sizeof(ulong)));
+
+        /* keep a pointer to the old array */
+        p2m_old = d->arch.p2m;
+    }
+
+    /* mark remaining (or all) mfn as INVALID_MFN, memset takes size in bytes 
*/
+    memset(p2m_array+copy_end, (int)INVALID_MFN,
+           (((ulong)(new_max - d->max_pages)) * sizeof(ulong)));
+
+    /* set p2m pointer */
+    d->arch.p2m = p2m_array;
+
+    /* free old p2m array if present */
+    if ( p2m_old )
+        free_xenheap_pages(d->arch.p2m, get_order_from_pages(d->max_pages));
+
+    return 0;
+}
diff -r 84ec1b4d5cd5 -r 35fd77200dff xen/arch/powerpc/domain_build.c
--- a/xen/arch/powerpc/domain_build.c   Wed Feb 21 18:14:12 2007 -0600
+++ b/xen/arch/powerpc/domain_build.c   Wed Feb 21 18:14:12 2007 -0600
@@ -28,6 +28,7 @@
 #include <xen/shadow.h>
 #include <xen/domain.h>
 #include <xen/version.h>
+#include <xen/shadow.h>
 #include <asm/processor.h>
 #include <asm/papr.h>
 #include <public/arch-powerpc.h>
@@ -159,6 +160,10 @@ int construct_dom0(struct domain *d,
         if (dom0_nrpages < CONFIG_MIN_DOM0_PAGES)
             dom0_nrpages = CONFIG_MIN_DOM0_PAGES;
     }
+
+    /* set DOM0 max mem, triggering p2m table creation */
+    if ( (guest_physmap_max_mem(d, dom0_nrpages)) != 0 )
+        panic("Failed to set DOM0 max mem value\n");
 
     /* By default DOM0 is allocated all available memory. */
     d->max_pages = dom0_nrpages;
diff -r 84ec1b4d5cd5 -r 35fd77200dff xen/include/asm-powerpc/domain.h
--- a/xen/include/asm-powerpc/domain.h  Wed Feb 21 18:14:12 2007 -0600
+++ b/xen/include/asm-powerpc/domain.h  Wed Feb 21 18:14:12 2007 -0600
@@ -46,6 +46,9 @@ struct arch_domain {
 
     /* I/O-port access bitmap mask. */
     u8 *iobmp_mask;       /* Address of IO bitmap mask, or NULL.      */
+
+    /* P2M mapping array */
+    ulong *p2m;
 
     uint large_page_sizes;
     uint large_page_order[4];
diff -r 84ec1b4d5cd5 -r 35fd77200dff xen/include/asm-powerpc/shadow.h
--- a/xen/include/asm-powerpc/shadow.h  Wed Feb 21 18:14:12 2007 -0600
+++ b/xen/include/asm-powerpc/shadow.h  Wed Feb 21 18:14:12 2007 -0600
@@ -37,6 +37,10 @@ extern void guest_physmap_remove_page(
 extern void guest_physmap_remove_page(
     struct domain *d, unsigned long gpfn, unsigned long mfn);
 
+int do_guest_physmap_max_mem(struct domain *d, unsigned long new_max);
+#undef guest_physmap_max_mem
+#define guest_physmap_max_mem(d, n) do_guest_physmap_max_mem(d, n)
+
 extern void shadow_drop_references(
     struct domain *d, struct page_info *page);
 

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