[Xen-devel] [PATCH 05/24] xen: clean up xen_load_gdt

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

From: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>

Makes the logic a bit clearer.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
---
 arch/x86/xen/enlighten.c |   15 +++++++++++++--
 1 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 70b355d..5776dc2 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -301,10 +301,21 @@ static void xen_load_gdt(const struct desc_ptr *dtr)
        frames = mcs.args;
 
        for (f = 0; va < dtr->address + size; va += PAGE_SIZE, f++) {
-               frames[f] = arbitrary_virt_to_mfn((void *)va);
+               int level;
+               pte_t *ptep = lookup_address(va, &level);
+               unsigned long pfn, mfn;
+               void *virt;
+
+               BUG_ON(ptep == NULL);
+
+               pfn = pte_pfn(*ptep);
+               mfn = pfn_to_mfn(pfn);
+               virt = __va(PFN_PHYS(pfn));
+
+               frames[f] = mfn;
 
                make_lowmem_page_readonly((void *)va);
-               make_lowmem_page_readonly(mfn_to_virt(frames[f]));
+               make_lowmem_page_readonly(virt);
        }
 
        MULTI_set_gdt(mcs.mc, frames, size / sizeof(struct desc_struct));
-- 
1.6.0.6


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