[Xen-devel] xen: make the ballon driver work for hvm domains

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

commit 9ca0fe4511f10546cd0a276cb637fa954298d66d
Author: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Date:   Wed Aug 11 12:14:47 2010 +0100

    xen: make the ballon driver work for hvm domains
    
    Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>

diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index 1a0d8c2..2b8695a 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -236,7 +236,7 @@ static int increase_reservation(unsigned long nr_pages)
                set_phys_to_machine(pfn, frame_list[i]);
 
                /* Link back into the page tables if not highmem. */
-               if (pfn < max_low_pfn) {
+               if (!xen_hvm_domain() && pfn < max_low_pfn) {
                        int ret;
                        ret = HYPERVISOR_update_va_mapping(
                                (unsigned long)__va(pfn << PAGE_SHIFT),
@@ -286,7 +286,7 @@ static int decrease_reservation(unsigned long nr_pages)
 
                scrub_page(page);
 
-               if (!PageHighMem(page)) {
+               if (!xen_hvm_domain() && !PageHighMem(page)) {
                        ret = HYPERVISOR_update_va_mapping(
                                (unsigned long)__va(pfn << PAGE_SHIFT),
                                __pte_ma(0), 0);
@@ -402,15 +402,19 @@ static struct notifier_block xenstore_notifier;
 
 static int __init balloon_init(void)
 {
-       unsigned long pfn;
+       unsigned long pfn, nr_pages;
        struct page *page;
 
-       if (!xen_pv_domain())
+       if (!xen_domain())
                return -ENODEV;
 
        pr_info("xen_balloon: Initialising balloon driver.\n");
 
-       balloon_stats.current_pages = min(xen_start_info->nr_pages, max_pfn);
+       if (xen_pv_domain())
+               nr_pages = xen_start_info->nr_pages;
+       else
+               nr_pages = max_pfn;
+       balloon_stats.current_pages = min(nr_pages, max_pfn);
        balloon_stats.target_pages  = balloon_stats.current_pages;
        balloon_stats.balloon_low   = 0;
        balloon_stats.balloon_high  = 0;
@@ -423,7 +427,7 @@ static int __init balloon_init(void)
        register_balloon(&balloon_sysdev);
 
        /* Initialise the balloon with excess memory space. */
-       for (pfn = xen_start_info->nr_pages; pfn < max_pfn; pfn++) {
+       for (pfn = nr_pages; pfn < max_pfn; pfn++) {
                page = pfn_to_page(pfn);
                if (!PageReserved(page))
                        balloon_append(page);

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