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xen: Complete pagetable pinning
Xen requires all active pagetables to be marked read-only. When the base of the pagetable is loaded into %cr3, the hypervisor validates the entire pagetable and only allows the load to proceed if it all checks out. This is pretty slow, so to mitigate this cost Xen has a notion of pinned pagetables. Pinned pagetables are pagetables which are considered to be active even if no processor's cr3 is pointing to is. This means that it must remain read-only and all updates are validated by the hypervisor. This makes context switches much cheaper, because the hypervisor doesn't need to revalidate the pagetable each time. This also adds a new paravirt hook which is called during setup once the zones and memory allocator have been initialized. When the init_mm pagetable is first built, the struct page array does not yet exist, and so there's nowhere to put he init_mm pagetable's PG_pinned flags. Once the zones are initialized and the struct page array exists, we can set the PG_pinned flags for those pages. This patch also adds the Xen support for pte pages allocated out of highmem (highpte) by implementing xen_kmap_atomic_pte. Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by: Chris Wright <chrisw@sous-sol.org> Cc: Zach Amsden <zach@vmware.com>
This commit is contained in:
Jeremy Fitzhardinge
Jeremy Fitzhardinge
parent
c85b04c374
commit
f4f97b3ea9
@ -21,6 +21,9 @@
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#include <linux/sched.h>
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#include <linux/bootmem.h>
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/page-flags.h>
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#include <linux/highmem.h>
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#include <xen/interface/xen.h>
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#include <xen/interface/physdev.h>
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@ -500,32 +503,59 @@ static void xen_write_cr3(unsigned long cr3)
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}
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}
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/* Early in boot, while setting up the initial pagetable, assume
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everything is pinned. */
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static void xen_alloc_pt_init(struct mm_struct *mm, u32 pfn)
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{
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BUG_ON(mem_map); /* should only be used early */
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make_lowmem_page_readonly(__va(PFN_PHYS(pfn)));
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}
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/* This needs to make sure the new pte page is pinned iff its being
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attached to a pinned pagetable. */
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static void xen_alloc_pt(struct mm_struct *mm, u32 pfn)
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{
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/* XXX pfn isn't necessarily a lowmem page */
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make_lowmem_page_readonly(__va(PFN_PHYS(pfn)));
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}
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static void xen_alloc_pd(u32 pfn)
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{
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make_lowmem_page_readonly(__va(PFN_PHYS(pfn)));
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}
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static void xen_release_pd(u32 pfn)
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{
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make_lowmem_page_readwrite(__va(PFN_PHYS(pfn)));
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struct page *page = pfn_to_page(pfn);
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if (PagePinned(virt_to_page(mm->pgd))) {
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SetPagePinned(page);
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if (!PageHighMem(page))
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make_lowmem_page_readonly(__va(PFN_PHYS(pfn)));
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else
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/* make sure there are no stray mappings of
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this page */
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kmap_flush_unused();
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}
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}
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/* This should never happen until we're OK to use struct page */
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static void xen_release_pt(u32 pfn)
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{
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make_lowmem_page_readwrite(__va(PFN_PHYS(pfn)));
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struct page *page = pfn_to_page(pfn);
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if (PagePinned(page)) {
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if (!PageHighMem(page))
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make_lowmem_page_readwrite(__va(PFN_PHYS(pfn)));
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}
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}
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static void xen_alloc_pd_clone(u32 pfn, u32 clonepfn,
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u32 start, u32 count)
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#ifdef CONFIG_HIGHPTE
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static void *xen_kmap_atomic_pte(struct page *page, enum km_type type)
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{
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xen_alloc_pd(pfn);
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pgprot_t prot = PAGE_KERNEL;
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if (PagePinned(page))
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prot = PAGE_KERNEL_RO;
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if (0 && PageHighMem(page))
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printk("mapping highpte %lx type %d prot %s\n",
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page_to_pfn(page), type,
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(unsigned long)pgprot_val(prot) & _PAGE_RW ? "WRITE" : "READ");
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return kmap_atomic_prot(page, type, prot);
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}
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#endif
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static __init void xen_pagetable_setup_start(pgd_t *base)
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{
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@ -553,7 +583,7 @@ static __init void xen_pagetable_setup_start(pgd_t *base)
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memcpy(pmd, (void *)pgd_page_vaddr(xen_pgd[i]),
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PAGE_SIZE);
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xen_alloc_pd(PFN_DOWN(__pa(pmd)));
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make_lowmem_page_readonly(pmd);
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set_pgd(&base[i], __pgd(1 + __pa(pmd)));
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} else
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@ -574,6 +604,10 @@ static __init void xen_pagetable_setup_start(pgd_t *base)
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static __init void xen_pagetable_setup_done(pgd_t *base)
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{
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/* This will work as long as patching hasn't happened yet
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(which it hasn't) */
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paravirt_ops.alloc_pt = xen_alloc_pt;
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if (!xen_feature(XENFEAT_auto_translated_physmap)) {
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/*
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* Create a mapping for the shared info page.
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@ -591,7 +625,19 @@ static __init void xen_pagetable_setup_done(pgd_t *base)
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HYPERVISOR_shared_info =
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(struct shared_info *)__va(xen_start_info->shared_info);
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xen_pgd_pin(base);
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/* Actually pin the pagetable down, but we can't set PG_pinned
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yet because the page structures don't exist yet. */
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{
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struct mmuext_op op;
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#ifdef CONFIG_X86_PAE
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op.cmd = MMUEXT_PIN_L3_TABLE;
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#else
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op.cmd = MMUEXT_PIN_L3_TABLE;
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#endif
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op.arg1.mfn = pfn_to_mfn(PFN_DOWN(__pa(base)));
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if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF))
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BUG();
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}
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xen_vcpu_setup(smp_processor_id());
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}
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@ -608,6 +654,7 @@ static const struct paravirt_ops xen_paravirt_ops __initdata = {
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.memory_setup = xen_memory_setup,
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.arch_setup = xen_arch_setup,
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.init_IRQ = xen_init_IRQ,
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.post_allocator_init = xen_mark_init_mm_pinned,
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.time_init = xen_time_init,
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.set_wallclock = xen_set_wallclock,
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@ -688,11 +735,15 @@ static const struct paravirt_ops xen_paravirt_ops __initdata = {
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.pagetable_setup_start = xen_pagetable_setup_start,
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.pagetable_setup_done = xen_pagetable_setup_done,
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.alloc_pt = xen_alloc_pt,
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.alloc_pd = xen_alloc_pd,
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.alloc_pd_clone = xen_alloc_pd_clone,
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.release_pd = xen_release_pd,
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.alloc_pt = xen_alloc_pt_init,
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.release_pt = xen_release_pt,
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.alloc_pd = paravirt_nop,
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.alloc_pd_clone = paravirt_nop,
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.release_pd = paravirt_nop,
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#ifdef CONFIG_HIGHPTE
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.kmap_atomic_pte = xen_kmap_atomic_pte,
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#endif
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.set_pte = xen_set_pte,
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.set_pte_at = xen_set_pte_at,
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@ -38,19 +38,22 @@
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*
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* Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007
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*/
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#include <linux/highmem.h>
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#include <linux/bug.h>
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#include <linux/sched.h>
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#include <asm/pgtable.h>
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#include <asm/tlbflush.h>
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#include <asm/mmu_context.h>
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#include <asm/paravirt.h>
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#include <asm/xen/hypercall.h>
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#include <asm/paravirt.h>
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#include <asm/xen/hypervisor.h>
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#include <xen/page.h>
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#include <xen/interface/xen.h>
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#include "multicalls.h"
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#include "mmu.h"
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xmaddr_t arbitrary_virt_to_machine(unsigned long address)
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@ -92,16 +95,6 @@ void make_lowmem_page_readwrite(void *vaddr)
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}
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void xen_set_pte(pte_t *ptep, pte_t pte)
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{
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struct mmu_update u;
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u.ptr = virt_to_machine(ptep).maddr;
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u.val = pte_val_ma(pte);
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if (HYPERVISOR_mmu_update(&u, 1, NULL, DOMID_SELF) < 0)
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BUG();
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}
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void xen_set_pmd(pmd_t *ptr, pmd_t val)
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{
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struct mmu_update u;
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@ -112,18 +105,6 @@ void xen_set_pmd(pmd_t *ptr, pmd_t val)
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BUG();
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}
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#ifdef CONFIG_X86_PAE
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void xen_set_pud(pud_t *ptr, pud_t val)
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{
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struct mmu_update u;
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u.ptr = virt_to_machine(ptr).maddr;
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u.val = pud_val_ma(val);
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if (HYPERVISOR_mmu_update(&u, 1, NULL, DOMID_SELF) < 0)
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BUG();
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}
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#endif
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/*
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* Associate a virtual page frame with a given physical page frame
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* and protection flags for that frame.
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@ -170,6 +151,23 @@ void xen_set_pte_at(struct mm_struct *mm, unsigned long addr,
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}
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#ifdef CONFIG_X86_PAE
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void xen_set_pud(pud_t *ptr, pud_t val)
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{
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struct mmu_update u;
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u.ptr = virt_to_machine(ptr).maddr;
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u.val = pud_val_ma(val);
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if (HYPERVISOR_mmu_update(&u, 1, NULL, DOMID_SELF) < 0)
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BUG();
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}
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void xen_set_pte(pte_t *ptep, pte_t pte)
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{
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ptep->pte_high = pte.pte_high;
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smp_wmb();
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ptep->pte_low = pte.pte_low;
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}
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void xen_set_pte_atomic(pte_t *ptep, pte_t pte)
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{
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set_64bit((u64 *)ptep, pte_val_ma(pte));
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@ -239,6 +237,11 @@ pgd_t xen_make_pgd(unsigned long long pgd)
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return (pgd_t){ pgd };
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}
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#else /* !PAE */
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void xen_set_pte(pte_t *ptep, pte_t pte)
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{
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*ptep = pte;
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}
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unsigned long xen_pte_val(pte_t pte)
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{
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unsigned long ret = pte.pte_low;
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@ -249,13 +252,6 @@ unsigned long xen_pte_val(pte_t pte)
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return ret;
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}
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unsigned long xen_pmd_val(pmd_t pmd)
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{
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/* a BUG here is a lot easier to track down than a NULL eip */
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BUG();
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return 0;
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}
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unsigned long xen_pgd_val(pgd_t pgd)
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{
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unsigned long ret = pgd.pgd;
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@ -272,13 +268,6 @@ pte_t xen_make_pte(unsigned long pte)
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return (pte_t){ pte };
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}
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pmd_t xen_make_pmd(unsigned long pmd)
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{
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/* a BUG here is a lot easier to track down than a NULL eip */
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BUG();
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return __pmd(0);
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}
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pgd_t xen_make_pgd(unsigned long pgd)
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{
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if (pgd & _PAGE_PRESENT)
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@ -290,108 +279,199 @@ pgd_t xen_make_pgd(unsigned long pgd)
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static void pgd_walk_set_prot(void *pt, pgprot_t flags)
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{
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unsigned long pfn = PFN_DOWN(__pa(pt));
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if (HYPERVISOR_update_va_mapping((unsigned long)pt,
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pfn_pte(pfn, flags), 0) < 0)
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BUG();
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}
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static void pgd_walk(pgd_t *pgd_base, pgprot_t flags)
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/*
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(Yet another) pagetable walker. This one is intended for pinning a
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pagetable. This means that it walks a pagetable and calls the
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callback function on each page it finds making up the page table,
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at every level. It walks the entire pagetable, but it only bothers
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pinning pte pages which are below pte_limit. In the normal case
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this will be TASK_SIZE, but at boot we need to pin up to
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FIXADDR_TOP. But the important bit is that we don't pin beyond
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there, because then we start getting into Xen's ptes.
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*/
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static int pgd_walk(pgd_t *pgd_base, int (*func)(struct page *, unsigned),
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unsigned long limit)
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{
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pgd_t *pgd = pgd_base;
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pud_t *pud;
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pmd_t *pmd;
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pte_t *pte;
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int g, u, m;
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int flush = 0;
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unsigned long addr = 0;
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unsigned long pgd_next;
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BUG_ON(limit > FIXADDR_TOP);
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if (xen_feature(XENFEAT_auto_translated_physmap))
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return;
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return 0;
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for (g = 0; g < USER_PTRS_PER_PGD; g++, pgd++) {
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if (pgd_none(*pgd))
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for (; addr != FIXADDR_TOP; pgd++, addr = pgd_next) {
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pud_t *pud;
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unsigned long pud_limit, pud_next;
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pgd_next = pud_limit = pgd_addr_end(addr, FIXADDR_TOP);
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if (!pgd_val(*pgd))
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continue;
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pud = pud_offset(pgd, 0);
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if (PTRS_PER_PUD > 1) /* not folded */
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pgd_walk_set_prot(pud, flags);
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flush |= (*func)(virt_to_page(pud), 0);
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for (; addr != pud_limit; pud++, addr = pud_next) {
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pmd_t *pmd;
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unsigned long pmd_limit;
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pud_next = pud_addr_end(addr, pud_limit);
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if (pud_next < limit)
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pmd_limit = pud_next;
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else
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pmd_limit = limit;
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for (u = 0; u < PTRS_PER_PUD; u++, pud++) {
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if (pud_none(*pud))
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continue;
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pmd = pmd_offset(pud, 0);
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if (PTRS_PER_PMD > 1) /* not folded */
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pgd_walk_set_prot(pmd, flags);
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flush |= (*func)(virt_to_page(pmd), 0);
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for (; addr != pmd_limit; pmd++) {
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addr += (PAGE_SIZE * PTRS_PER_PTE);
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if ((pmd_limit-1) < (addr-1)) {
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addr = pmd_limit;
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break;
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}
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for (m = 0; m < PTRS_PER_PMD; m++, pmd++) {
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if (pmd_none(*pmd))
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continue;
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/* This can get called before mem_map
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is set up, so we assume nothing is
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highmem at that point. */
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if (mem_map == NULL ||
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!PageHighMem(pmd_page(*pmd))) {
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pte = pte_offset_kernel(pmd, 0);
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pgd_walk_set_prot(pte, flags);
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}
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flush |= (*func)(pmd_page(*pmd), 0);
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}
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}
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}
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if (HYPERVISOR_update_va_mapping((unsigned long)pgd_base,
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pfn_pte(PFN_DOWN(__pa(pgd_base)),
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flags),
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UVMF_TLB_FLUSH) < 0)
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BUG();
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flush |= (*func)(virt_to_page(pgd_base), UVMF_TLB_FLUSH);
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return flush;
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}
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static int pin_page(struct page *page, unsigned flags)
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{
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unsigned pgfl = test_and_set_bit(PG_pinned, &page->flags);
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int flush;
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/* This is called just after a mm has been duplicated from its parent,
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but it has not been used yet. We need to make sure that its
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pagetable is all read-only, and can be pinned. */
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if (pgfl)
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flush = 0; /* already pinned */
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else if (PageHighMem(page))
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/* kmaps need flushing if we found an unpinned
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highpage */
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flush = 1;
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else {
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void *pt = lowmem_page_address(page);
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unsigned long pfn = page_to_pfn(page);
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struct multicall_space mcs = __xen_mc_entry(0);
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flush = 0;
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MULTI_update_va_mapping(mcs.mc, (unsigned long)pt,
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pfn_pte(pfn, PAGE_KERNEL_RO),
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flags);
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}
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return flush;
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}
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/* This is called just after a mm has been created, but it has not
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been used yet. We need to make sure that its pagetable is all
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read-only, and can be pinned. */
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void xen_pgd_pin(pgd_t *pgd)
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{
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struct mmuext_op op;
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struct multicall_space mcs;
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struct mmuext_op *op;
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pgd_walk(pgd, PAGE_KERNEL_RO);
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xen_mc_batch();
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#if defined(CONFIG_X86_PAE)
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op.cmd = MMUEXT_PIN_L3_TABLE;
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if (pgd_walk(pgd, pin_page, TASK_SIZE))
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kmap_flush_unused();
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mcs = __xen_mc_entry(sizeof(*op));
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op = mcs.args;
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#ifdef CONFIG_X86_PAE
|
||||
op->cmd = MMUEXT_PIN_L3_TABLE;
|
||||
#else
|
||||
op.cmd = MMUEXT_PIN_L2_TABLE;
|
||||
op->cmd = MMUEXT_PIN_L2_TABLE;
|
||||
#endif
|
||||
op.arg1.mfn = pfn_to_mfn(PFN_DOWN(__pa(pgd)));
|
||||
if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF) < 0)
|
||||
BUG();
|
||||
op->arg1.mfn = pfn_to_mfn(PFN_DOWN(__pa(pgd)));
|
||||
MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
|
||||
|
||||
xen_mc_issue(0);
|
||||
}
|
||||
|
||||
/* The init_mm pagetable is really pinned as soon as its created, but
|
||||
that's before we have page structures to store the bits. So do all
|
||||
the book-keeping now. */
|
||||
static __init int mark_pinned(struct page *page, unsigned flags)
|
||||
{
|
||||
SetPagePinned(page);
|
||||
return 0;
|
||||
}
|
||||
|
||||
void __init xen_mark_init_mm_pinned(void)
|
||||
{
|
||||
pgd_walk(init_mm.pgd, mark_pinned, FIXADDR_TOP);
|
||||
}
|
||||
|
||||
static int unpin_page(struct page *page, unsigned flags)
|
||||
{
|
||||
unsigned pgfl = test_and_clear_bit(PG_pinned, &page->flags);
|
||||
|
||||
if (pgfl && !PageHighMem(page)) {
|
||||
void *pt = lowmem_page_address(page);
|
||||
unsigned long pfn = page_to_pfn(page);
|
||||
struct multicall_space mcs = __xen_mc_entry(0);
|
||||
|
||||
MULTI_update_va_mapping(mcs.mc, (unsigned long)pt,
|
||||
pfn_pte(pfn, PAGE_KERNEL),
|
||||
flags);
|
||||
}
|
||||
|
||||
return 0; /* never need to flush on unpin */
|
||||
}
|
||||
|
||||
/* Release a pagetables pages back as normal RW */
|
||||
void xen_pgd_unpin(pgd_t *pgd)
|
||||
static void xen_pgd_unpin(pgd_t *pgd)
|
||||
{
|
||||
struct mmuext_op op;
|
||||
struct mmuext_op *op;
|
||||
struct multicall_space mcs;
|
||||
|
||||
op.cmd = MMUEXT_UNPIN_TABLE;
|
||||
op.arg1.mfn = pfn_to_mfn(PFN_DOWN(__pa(pgd)));
|
||||
xen_mc_batch();
|
||||
|
||||
if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF) < 0)
|
||||
BUG();
|
||||
mcs = __xen_mc_entry(sizeof(*op));
|
||||
|
||||
pgd_walk(pgd, PAGE_KERNEL);
|
||||
op = mcs.args;
|
||||
op->cmd = MMUEXT_UNPIN_TABLE;
|
||||
op->arg1.mfn = pfn_to_mfn(PFN_DOWN(__pa(pgd)));
|
||||
|
||||
MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
|
||||
|
||||
pgd_walk(pgd, unpin_page, TASK_SIZE);
|
||||
|
||||
xen_mc_issue(0);
|
||||
}
|
||||
|
||||
|
||||
void xen_activate_mm(struct mm_struct *prev, struct mm_struct *next)
|
||||
{
|
||||
spin_lock(&next->page_table_lock);
|
||||
xen_pgd_pin(next->pgd);
|
||||
spin_unlock(&next->page_table_lock);
|
||||
}
|
||||
|
||||
void xen_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm)
|
||||
{
|
||||
spin_lock(&mm->page_table_lock);
|
||||
xen_pgd_pin(mm->pgd);
|
||||
spin_unlock(&mm->page_table_lock);
|
||||
}
|
||||
|
||||
void xen_exit_mmap(struct mm_struct *mm)
|
||||
|
||||
@ -15,7 +15,7 @@ void xen_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm);
|
||||
void xen_exit_mmap(struct mm_struct *mm);
|
||||
|
||||
void xen_pgd_pin(pgd_t *pgd);
|
||||
void xen_pgd_unpin(pgd_t *pgd);
|
||||
//void xen_pgd_unpin(pgd_t *pgd);
|
||||
|
||||
#ifdef CONFIG_X86_PAE
|
||||
unsigned long long xen_pte_val(pte_t);
|
||||
|
||||
@ -20,6 +20,8 @@ unsigned long xen_get_wallclock(void);
|
||||
int xen_set_wallclock(unsigned long time);
|
||||
cycle_t xen_clocksource_read(void);
|
||||
|
||||
void xen_mark_init_mm_pinned(void);
|
||||
|
||||
DECLARE_PER_CPU(enum paravirt_lazy_mode, xen_lazy_mode);
|
||||
|
||||
static inline unsigned xen_get_lazy_mode(void)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user