x86/xen: fix memory setup for PVH dom0

Since af06d66ee32b (x86: fix setup of PVH Dom0 memory map) in Xen, PVH
dom0 need only use the memory memory provided by Xen which has already
setup all the correct holes.

xen_memory_setup() then ends up being trivial for a PVH guest so
introduce a new function (xen_auto_xlated_memory_setup()).

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
Tested-by: Roger Pau Monné <roger.pau@citrix.com>

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 662bdcbbbd18edc74859fca4a620f6cc8a4bb000..3123d1f74415d0568c4f641bde2793091aab2339 100644 (file)
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1537,7 +1537,10 @@ asmlinkage void __init xen_start_kernel(void)
        if (!xen_pvh_domain())
                pv_cpu_ops = xen_cpu_ops;
 
-       x86_init.resources.memory_setup = xen_memory_setup;
+       if (xen_feature(XENFEAT_auto_translated_physmap))
+               x86_init.resources.memory_setup = xen_auto_xlated_memory_setup;
+       else
+               x86_init.resources.memory_setup = xen_memory_setup;
        x86_init.oem.arch_setup = xen_arch_setup;
        x86_init.oem.banner = xen_banner;
 

diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index 210426a26cc0d92f9722ec297466bccbbf232982..37cfbfacd59a09db745d2eae9b96993342a9527b 100644 (file)
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -517,6 +517,35 @@ char * __init xen_memory_setup(void)
        return "Xen";
 }
 
+/*
+ * Machine specific memory setup for auto-translated guests.
+ */
+char * __init xen_auto_xlated_memory_setup(void)
+{
+       static struct e820entry map[E820MAX] __initdata;
+
+       struct xen_memory_map memmap;
+       int i;
+       int rc;
+
+       memmap.nr_entries = E820MAX;
+       set_xen_guest_handle(memmap.buffer, map);
+
+       rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap);
+       if (rc < 0)
+               panic("No memory map (%d)\n", rc);
+
+       sanitize_e820_map(map, ARRAY_SIZE(map), &memmap.nr_entries);
+
+       for (i = 0; i < memmap.nr_entries; i++)
+               e820_add_region(map[i].addr, map[i].size, map[i].type);
+
+       memblock_reserve(__pa(xen_start_info->mfn_list),
+                        xen_start_info->pt_base - xen_start_info->mfn_list);
+
+       return "Xen";
+}
+
 /*
  * Set the bit indicating "nosegneg" library variants should be used.
  * We only need to bother in pure 32-bit mode; compat 32-bit processes

diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h
index c834d4b231f08d65319448ef8436ff1ec99d364a..97d87659f77964946e103a83f654c0169ddf5885 100644 (file)
--- a/arch/x86/xen/xen-ops.h
+++ b/arch/x86/xen/xen-ops.h
@@ -36,6 +36,7 @@ void xen_mm_unpin_all(void);
 void xen_set_pat(u64);
 
 char * __init xen_memory_setup(void);
+char * xen_auto_xlated_memory_setup(void);
 void __init xen_arch_setup(void);
 void xen_enable_sysenter(void);
 void xen_enable_syscall(void);