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Commit 3843fc25 authored by Jeremy Fitzhardinge's avatar Jeremy Fitzhardinge Committed by Thomas Gleixner
Browse files

xen: remove support for non-PAE 32-bit 



Non-PAE operation has been deprecated in Xen for a while, and is
rarely tested or used.  xen-unstable has now officially dropped
non-PAE support.  Since Xen/pvops' non-PAE support has also been
broken for a while, we may as well completely drop it altogether.

Signed-off-by: default avatarJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 78b58e54

arch/x86/xen/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -6,7 +6,7 @@ config XEN 
	bool "Xen guest support"

	select PARAVIRT

	depends on X86_32

	depends on X86_CMPXCHG && X86_TSC && !(X86_VISWS || X86_VOYAGER)

	depends on X86_CMPXCHG && X86_TSC && X86_PAE && !(X86_VISWS || X86_VOYAGER)

	help

	  This is the Linux Xen port.  Enabling this will allow the

	  kernel to boot in a paravirtualized environment under the

arch/x86/xen/enlighten.c

+18 −33
Original line number Diff line number Diff line
@@ -785,20 +785,18 @@ static __init void xen_set_pte_init(pte_t *ptep, pte_t pte) 
static __init void xen_pagetable_setup_start(pgd_t *base)

{

	pgd_t *xen_pgd = (pgd_t *)xen_start_info->pt_base;

	int i;



	/* special set_pte for pagetable initialization */

	pv_mmu_ops.set_pte = xen_set_pte_init;



	init_mm.pgd = base;

	/*

	 * copy top-level of Xen-supplied pagetable into place.	 For

	 * !PAE we can use this as-is, but for PAE it is a stand-in

	 * while we copy the pmd pages.

	 * copy top-level of Xen-supplied pagetable into place.  This

	 * is a stand-in while we copy the pmd pages.

	 */

	memcpy(base, xen_pgd, PTRS_PER_PGD * sizeof(pgd_t));



	if (PTRS_PER_PMD > 1) {

		int i;

	/*

	 * For PAE, need to allocate new pmds, rather than

	 * share Xen's, since Xen doesn't like pmd's being
@@ -817,7 +815,6 @@ static __init void xen_pagetable_setup_start(pgd_t *base) 
		} else

			pgd_clear(&base[i]);

	}

	}



	/* make sure zero_page is mapped RO so we can use it in pagetables */

	make_lowmem_page_readonly(empty_zero_page);
@@ -873,17 +870,7 @@ static __init void xen_pagetable_setup_done(pgd_t *base) 


	/* Actually pin the pagetable down, but we can't set PG_pinned

	   yet because the page structures don't exist yet. */

	{

		unsigned level;



#ifdef CONFIG_X86_PAE

		level = MMUEXT_PIN_L3_TABLE;

#else

		level = MMUEXT_PIN_L2_TABLE;

#endif



		pin_pagetable_pfn(level, PFN_DOWN(__pa(base)));

	}

	pin_pagetable_pfn(MMUEXT_PIN_L3_TABLE, PFN_DOWN(__pa(base)));

}



/* This is called once we have the cpu_possible_map */
@@ -1093,7 +1080,6 @@ static const struct pv_mmu_ops xen_mmu_ops __initdata = { 
	.make_pte = xen_make_pte,

	.make_pgd = xen_make_pgd,



#ifdef CONFIG_X86_PAE

	.set_pte_atomic = xen_set_pte_atomic,

	.set_pte_present = xen_set_pte_at,

	.set_pud = xen_set_pud,
@@ -1102,7 +1088,6 @@ static const struct pv_mmu_ops xen_mmu_ops __initdata = { 


	.make_pmd = xen_make_pmd,

	.pmd_val = xen_pmd_val,

#endif	/* PAE */



	.activate_mm = xen_activate_mm,

	.dup_mmap = xen_dup_mmap,

arch/x86/xen/mmu.c

+2 −17
Original line number Diff line number Diff line
@@ -222,7 +222,7 @@ pmdval_t xen_pmd_val(pmd_t pmd) 
		ret = machine_to_phys(XMADDR(ret)).paddr | _PAGE_PRESENT;

	return ret;

}

#ifdef CONFIG_X86_PAE



void xen_set_pud(pud_t *ptr, pud_t val)

{

	struct multicall_space mcs;
@@ -272,12 +272,6 @@ pmd_t xen_make_pmd(pmdval_t pmd) 


	return native_make_pmd(pmd);

}

#else  /* !PAE */

void xen_set_pte(pte_t *ptep, pte_t pte)

{

	*ptep = pte;

}

#endif	/* CONFIG_X86_PAE */



/*

  (Yet another) pagetable walker.  This one is intended for pinning a
@@ -430,8 +424,6 @@ static int pin_page(struct page *page, enum pt_level level) 
   read-only, and can be pinned. */

void xen_pgd_pin(pgd_t *pgd)

{

	unsigned level;



	xen_mc_batch();



	if (pgd_walk(pgd, pin_page, TASK_SIZE)) {
@@ -441,14 +433,7 @@ void xen_pgd_pin(pgd_t *pgd) 
		xen_mc_batch();

	}



#ifdef CONFIG_X86_PAE

	level = MMUEXT_PIN_L3_TABLE;

#else

	level = MMUEXT_PIN_L2_TABLE;

#endif



	xen_do_pin(level, PFN_DOWN(__pa(pgd)));



	xen_do_pin(MMUEXT_PIN_L3_TABLE, PFN_DOWN(__pa(pgd)));

	xen_mc_issue(0);

}

arch/x86/xen/mmu.h

+6 −18
Original line number Diff line number Diff line
@@ -37,14 +37,13 @@ void xen_exit_mmap(struct mm_struct *mm); 
void xen_pgd_pin(pgd_t *pgd);

//void xen_pgd_unpin(pgd_t *pgd);



#ifdef CONFIG_X86_PAE

unsigned long long xen_pte_val(pte_t);

unsigned long long xen_pmd_val(pmd_t);

unsigned long long xen_pgd_val(pgd_t);

pteval_t xen_pte_val(pte_t);

pmdval_t xen_pmd_val(pmd_t);

pgdval_t xen_pgd_val(pgd_t);



pte_t xen_make_pte(unsigned long long);

pmd_t xen_make_pmd(unsigned long long);

pgd_t xen_make_pgd(unsigned long long);

pte_t xen_make_pte(pteval_t);

pmd_t xen_make_pmd(pmdval_t);

pgd_t xen_make_pgd(pgdval_t);



void xen_set_pte_at(struct mm_struct *mm, unsigned long addr,

		    pte_t *ptep, pte_t pteval);
@@ -53,15 +52,4 @@ void xen_set_pud(pud_t *ptr, pud_t val); 
void xen_pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep);

void xen_pmd_clear(pmd_t *pmdp);





#else

unsigned long xen_pte_val(pte_t);

unsigned long xen_pmd_val(pmd_t);

unsigned long xen_pgd_val(pgd_t);



pte_t xen_make_pte(unsigned long);

pmd_t xen_make_pmd(unsigned long);

pgd_t xen_make_pgd(unsigned long);

#endif



#endif	/* _XEN_MMU_H */

arch/x86/xen/xen-head.S

+0 −4
Original line number Diff line number Diff line
@@ -30,11 +30,7 @@ ENTRY(hypercall_page) 
	ELFNOTE(Xen, XEN_ELFNOTE_ENTRY,          .long  startup_xen)

	ELFNOTE(Xen, XEN_ELFNOTE_HYPERCALL_PAGE, .long  hypercall_page)

	ELFNOTE(Xen, XEN_ELFNOTE_FEATURES,       .asciz "!writable_page_tables|pae_pgdir_above_4gb")

#ifdef CONFIG_X86_PAE

	ELFNOTE(Xen, XEN_ELFNOTE_PAE_MODE,       .asciz "yes")

#else

	ELFNOTE(Xen, XEN_ELFNOTE_PAE_MODE,       .asciz "no")

#endif

	ELFNOTE(Xen, XEN_ELFNOTE_LOADER,         .asciz "generic")



#endif /*CONFIG_XEN */