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Commit c7da8c82 authored by Jeremy Fitzhardinge's avatar Jeremy Fitzhardinge
Browse files

xen: clean up xen_load_gdt 



Makes the logic a bit clearer.

Signed-off-by: default avatarJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
parent cdaead6b

arch/x86/xen/enlighten.c

+13 −2
Original line number Diff line number Diff line
@@ -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));