[xen staging] tools/init-xenstore-domain: fix memory map for PVH stubdom

[patchbot@xxxxxxx]

commit 134d53f577076d4f26091e25762f27cc3c73bf58
Author:     Juergen Gross <jgross@xxxxxxxx>
AuthorDate: Tue Jul 12 15:25:20 2022 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Jul 12 15:25:20 2022 +0200

    tools/init-xenstore-domain: fix memory map for PVH stubdom
    
    In case of maxmem != memsize the E820 map of the PVH stubdom is wrong,
    as it is missing the RAM above memsize.
    
    Additionally the memory map should only specify the Xen special pages
    as reserved.
    
    Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
    Reviewed-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---
 tools/helpers/init-xenstore-domain.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/tools/helpers/init-xenstore-domain.c 
b/tools/helpers/init-xenstore-domain.c
index b4f3c65a8a..2d9ab6f1c5 100644
--- a/tools/helpers/init-xenstore-domain.c
+++ b/tools/helpers/init-xenstore-domain.c
@@ -71,8 +71,9 @@ static int build(xc_interface *xch)
     char cmdline[512];
     int rv, xs_fd;
     struct xc_dom_image *dom = NULL;
-    int limit_kb = (maxmem ? : (memory + 1)) * 1024;
+    int limit_kb = (maxmem ? : memory) * 1024 + X86_HVM_NR_SPECIAL_PAGES * 4;
     uint64_t mem_size = MB(memory);
+    uint64_t max_size = MB(maxmem ? : memory);
     struct e820entry e820[3];
     struct xen_domctl_createdomain config = {
         .ssidref = SECINITSID_DOMU,
@@ -165,13 +166,16 @@ static int build(xc_interface *xch)
         dom->mmio_start = LAPIC_BASE_ADDRESS;
         dom->max_vcpus = 1;
         e820[0].addr = 0;
-        e820[0].size = dom->lowmem_end;
+        e820[0].size = (max_size > LAPIC_BASE_ADDRESS) ?
+                       LAPIC_BASE_ADDRESS : max_size;
         e820[0].type = E820_RAM;
-        e820[1].addr = LAPIC_BASE_ADDRESS;
-        e820[1].size = dom->mmio_size;
+        e820[1].addr = (X86_HVM_END_SPECIAL_REGION -
+                        X86_HVM_NR_SPECIAL_PAGES) << XC_PAGE_SHIFT;
+        e820[1].size = X86_HVM_NR_SPECIAL_PAGES << XC_PAGE_SHIFT;
         e820[1].type = E820_RESERVED;
         e820[2].addr = GB(4);
-        e820[2].size = dom->highmem_end - GB(4);
+        e820[2].size = (max_size > LAPIC_BASE_ADDRESS) ?
+                       max_size - LAPIC_BASE_ADDRESS : 0;
         e820[2].type = E820_RAM;
     }
 
--
generated by git-patchbot for /home/xen/git/xen.git#staging