#include <linux/mm.h>
#include <linux/page-flags.h>
#include <linux/highmem.h>
-#include <linux/smp.h>
#include <xen/interface/xen.h>
#include <xen/interface/physdev.h>
EXPORT_SYMBOL_GPL(hypercall_page);
-DEFINE_PER_CPU(enum paravirt_lazy_mode, xen_lazy_mode);
-
DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
DEFINE_PER_CPU(struct vcpu_info, xen_vcpu_info);
-DEFINE_PER_CPU(unsigned long, xen_cr3);
+
+/*
+ * Note about cr3 (pagetable base) values:
+ *
+ * xen_cr3 contains the current logical cr3 value; it contains the
+ * last set cr3. This may not be the current effective cr3, because
+ * its update may be being lazily deferred. However, a vcpu looking
+ * at its own cr3 can use this value knowing that it everything will
+ * be self-consistent.
+ *
+ * xen_current_cr3 contains the actual vcpu cr3; it is set once the
+ * hypercall to set the vcpu cr3 is complete (so it may be a little
+ * out of date, but it will never be set early). If one vcpu is
+ * looking at another vcpu's cr3 value, it should use this variable.
+ */
+DEFINE_PER_CPU(unsigned long, xen_cr3); /* cr3 stored as physaddr */
+DEFINE_PER_CPU(unsigned long, xen_current_cr3); /* actual vcpu cr3 */
struct start_info *xen_start_info;
EXPORT_SYMBOL_GPL(xen_start_info);
info.mfn = virt_to_mfn(vcpup);
info.offset = offset_in_page(vcpup);
- printk(KERN_DEBUG "trying to map vcpu_info %d at %p, mfn %x, offset %d\n",
+ printk(KERN_DEBUG "trying to map vcpu_info %d at %p, mfn %llx, offset %d\n",
cpu, vcpup, info.mfn, info.offset);
/* Check to see if the hypervisor will put the vcpu_info
static void __init xen_banner(void)
{
printk(KERN_INFO "Booting paravirtualized kernel on %s\n",
- paravirt_ops.name);
+ pv_info.name);
printk(KERN_INFO "Hypervisor signature: %s\n", xen_start_info->magic);
}
xen_safe_halt();
}
-static void xen_set_lazy_mode(enum paravirt_lazy_mode mode)
+static void xen_leave_lazy(void)
{
- BUG_ON(preemptible());
-
- switch (mode) {
- case PARAVIRT_LAZY_NONE:
- BUG_ON(x86_read_percpu(xen_lazy_mode) == PARAVIRT_LAZY_NONE);
- break;
-
- case PARAVIRT_LAZY_MMU:
- case PARAVIRT_LAZY_CPU:
- BUG_ON(x86_read_percpu(xen_lazy_mode) != PARAVIRT_LAZY_NONE);
- break;
-
- case PARAVIRT_LAZY_FLUSH:
- /* flush if necessary, but don't change state */
- if (x86_read_percpu(xen_lazy_mode) != PARAVIRT_LAZY_NONE)
- xen_mc_flush();
- return;
- }
-
+ paravirt_leave_lazy(paravirt_get_lazy_mode());
xen_mc_flush();
- x86_write_percpu(xen_lazy_mode, mode);
}
static unsigned long xen_store_tr(void)
* loaded properly. This will go away as soon as Xen has been
* modified to not save/restore %gs for normal hypercalls.
*/
- if (xen_get_lazy_mode() == PARAVIRT_LAZY_CPU)
+ if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_CPU)
loadsegment(gs, 0);
}
return x86_read_percpu(xen_cr3);
}
+static void set_current_cr3(void *v)
+{
+ x86_write_percpu(xen_current_cr3, (unsigned long)v);
+}
+
static void xen_write_cr3(unsigned long cr3)
{
+ struct mmuext_op *op;
+ struct multicall_space mcs;
+ unsigned long mfn = pfn_to_mfn(PFN_DOWN(cr3));
+
BUG_ON(preemptible());
- if (cr3 == x86_read_percpu(xen_cr3)) {
- /* just a simple tlb flush */
- xen_flush_tlb();
- return;
- }
+ mcs = xen_mc_entry(sizeof(*op)); /* disables interrupts */
+ /* Update while interrupts are disabled, so its atomic with
+ respect to ipis */
x86_write_percpu(xen_cr3, cr3);
+ op = mcs.args;
+ op->cmd = MMUEXT_NEW_BASEPTR;
+ op->arg1.mfn = mfn;
- {
- struct mmuext_op *op;
- struct multicall_space mcs = xen_mc_entry(sizeof(*op));
- unsigned long mfn = pfn_to_mfn(PFN_DOWN(cr3));
-
- op = mcs.args;
- op->cmd = MMUEXT_NEW_BASEPTR;
- op->arg1.mfn = mfn;
+ MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
- MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
+ /* Update xen_update_cr3 once the batch has actually
+ been submitted. */
+ xen_mc_callback(set_current_cr3, (void *)cr3);
- xen_mc_issue(PARAVIRT_LAZY_CPU);
- }
+ xen_mc_issue(PARAVIRT_LAZY_CPU); /* interrupts restored */
}
/* Early in boot, while setting up the initial pagetable, assume
make_lowmem_page_readonly(__va(PFN_PHYS(pfn)));
}
+static void pin_pagetable_pfn(unsigned level, unsigned long pfn)
+{
+ struct mmuext_op op;
+ op.cmd = level;
+ op.arg1.mfn = pfn_to_mfn(pfn);
+ if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF))
+ BUG();
+}
+
/* This needs to make sure the new pte page is pinned iff its being
attached to a pinned pagetable. */
static void xen_alloc_pt(struct mm_struct *mm, u32 pfn)
if (PagePinned(virt_to_page(mm->pgd))) {
SetPagePinned(page);
- if (!PageHighMem(page))
+ if (!PageHighMem(page)) {
make_lowmem_page_readonly(__va(PFN_PHYS(pfn)));
- else
+ pin_pagetable_pfn(MMUEXT_PIN_L1_TABLE, pfn);
+ } else
/* make sure there are no stray mappings of
this page */
kmap_flush_unused();
struct page *page = pfn_to_page(pfn);
if (PagePinned(page)) {
- if (!PageHighMem(page))
+ if (!PageHighMem(page)) {
+ pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, pfn);
make_lowmem_page_readwrite(__va(PFN_PHYS(pfn)));
+ }
}
}
pgd_t *xen_pgd = (pgd_t *)xen_start_info->pt_base;
/* special set_pte for pagetable initialization */
- paravirt_ops.set_pte = xen_set_pte_init;
+ pv_mmu_ops.set_pte = xen_set_pte_init;
init_mm.pgd = base;
/*
{
/* This will work as long as patching hasn't happened yet
(which it hasn't) */
- paravirt_ops.alloc_pt = xen_alloc_pt;
- paravirt_ops.set_pte = xen_set_pte;
+ pv_mmu_ops.alloc_pt = xen_alloc_pt;
+ pv_mmu_ops.set_pte = xen_set_pte;
if (!xen_feature(XENFEAT_auto_translated_physmap)) {
/*
/* Actually pin the pagetable down, but we can't set PG_pinned
yet because the page structures don't exist yet. */
{
- struct mmuext_op op;
+ unsigned level;
+
#ifdef CONFIG_X86_PAE
- op.cmd = MMUEXT_PIN_L3_TABLE;
+ level = MMUEXT_PIN_L3_TABLE;
#else
- op.cmd = MMUEXT_PIN_L3_TABLE;
+ level = MMUEXT_PIN_L2_TABLE;
#endif
- op.arg1.mfn = pfn_to_mfn(PFN_DOWN(__pa(base)));
- if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF))
- BUG();
+
+ pin_pagetable_pfn(level, PFN_DOWN(__pa(base)));
}
}
if (have_vcpu_info_placement) {
printk(KERN_INFO "Xen: using vcpu_info placement\n");
- paravirt_ops.save_fl = xen_save_fl_direct;
- paravirt_ops.restore_fl = xen_restore_fl_direct;
- paravirt_ops.irq_disable = xen_irq_disable_direct;
- paravirt_ops.irq_enable = xen_irq_enable_direct;
- paravirt_ops.read_cr2 = xen_read_cr2_direct;
- paravirt_ops.iret = xen_iret_direct;
+ pv_irq_ops.save_fl = xen_save_fl_direct;
+ pv_irq_ops.restore_fl = xen_restore_fl_direct;
+ pv_irq_ops.irq_disable = xen_irq_disable_direct;
+ pv_irq_ops.irq_enable = xen_irq_enable_direct;
+ pv_mmu_ops.read_cr2 = xen_read_cr2_direct;
+ pv_cpu_ops.iret = xen_iret_direct;
}
}
start = end = reloc = NULL;
-#define SITE(x) \
- case PARAVIRT_PATCH(x): \
+#define SITE(op, x) \
+ case PARAVIRT_PATCH(op.x): \
if (have_vcpu_info_placement) { \
start = (char *)xen_##x##_direct; \
end = xen_##x##_direct_end; \
goto patch_site
switch (type) {
- SITE(irq_enable);
- SITE(irq_disable);
- SITE(save_fl);
- SITE(restore_fl);
+ SITE(pv_irq_ops, irq_enable);
+ SITE(pv_irq_ops, irq_disable);
+ SITE(pv_irq_ops, save_fl);
+ SITE(pv_irq_ops, restore_fl);
#undef SITE
patch_site:
return ret;
}
-static const struct paravirt_ops xen_paravirt_ops __initdata = {
+static const struct pv_info xen_info __initdata = {
.paravirt_enabled = 1,
.shared_kernel_pmd = 0,
.name = "Xen",
- .banner = xen_banner,
+};
+static const struct pv_init_ops xen_init_ops __initdata = {
.patch = xen_patch,
+ .banner = xen_banner,
.memory_setup = xen_memory_setup,
.arch_setup = xen_arch_setup,
- .init_IRQ = xen_init_IRQ,
.post_allocator_init = xen_mark_init_mm_pinned,
+};
+static const struct pv_time_ops xen_time_ops __initdata = {
.time_init = xen_time_init,
+
.set_wallclock = xen_set_wallclock,
.get_wallclock = xen_get_wallclock,
.get_cpu_khz = xen_cpu_khz,
.sched_clock = xen_sched_clock,
+};
+static const struct pv_cpu_ops xen_cpu_ops __initdata = {
.cpuid = xen_cpuid,
.set_debugreg = xen_set_debugreg,
.read_cr0 = native_read_cr0,
.write_cr0 = native_write_cr0,
- .read_cr2 = xen_read_cr2,
- .write_cr2 = xen_write_cr2,
-
- .read_cr3 = xen_read_cr3,
- .write_cr3 = xen_write_cr3,
-
.read_cr4 = native_read_cr4,
.read_cr4_safe = native_read_cr4_safe,
.write_cr4 = xen_write_cr4,
- .save_fl = xen_save_fl,
- .restore_fl = xen_restore_fl,
- .irq_disable = xen_irq_disable,
- .irq_enable = xen_irq_enable,
- .safe_halt = xen_safe_halt,
- .halt = xen_halt,
.wbinvd = native_wbinvd,
.read_msr = native_read_msr_safe,
.set_iopl_mask = xen_set_iopl_mask,
.io_delay = xen_io_delay,
+ .lazy_mode = {
+ .enter = paravirt_enter_lazy_cpu,
+ .leave = xen_leave_lazy,
+ },
+};
+
+static const struct pv_irq_ops xen_irq_ops __initdata = {
+ .init_IRQ = xen_init_IRQ,
+ .save_fl = xen_save_fl,
+ .restore_fl = xen_restore_fl,
+ .irq_disable = xen_irq_disable,
+ .irq_enable = xen_irq_enable,
+ .safe_halt = xen_safe_halt,
+ .halt = xen_halt,
+};
+
+static const struct pv_apic_ops xen_apic_ops __initdata = {
#ifdef CONFIG_X86_LOCAL_APIC
.apic_write = xen_apic_write,
.apic_write_atomic = xen_apic_write,
.setup_secondary_clock = paravirt_nop,
.startup_ipi_hook = paravirt_nop,
#endif
+};
+
+static const struct pv_mmu_ops xen_mmu_ops __initdata = {
+ .pagetable_setup_start = xen_pagetable_setup_start,
+ .pagetable_setup_done = xen_pagetable_setup_done,
+
+ .read_cr2 = xen_read_cr2,
+ .write_cr2 = xen_write_cr2,
+
+ .read_cr3 = xen_read_cr3,
+ .write_cr3 = xen_write_cr3,
.flush_tlb_user = xen_flush_tlb,
.flush_tlb_kernel = xen_flush_tlb,
.pte_update = paravirt_nop,
.pte_update_defer = paravirt_nop,
- .pagetable_setup_start = xen_pagetable_setup_start,
- .pagetable_setup_done = xen_pagetable_setup_done,
-
.alloc_pt = xen_alloc_pt_init,
.release_pt = xen_release_pt,
.alloc_pd = paravirt_nop,
.dup_mmap = xen_dup_mmap,
.exit_mmap = xen_exit_mmap,
- .set_lazy_mode = xen_set_lazy_mode,
+ .lazy_mode = {
+ .enter = paravirt_enter_lazy_mmu,
+ .leave = xen_leave_lazy,
+ },
};
#ifdef CONFIG_SMP
};
+static void __init xen_reserve_top(void)
+{
+ unsigned long top = HYPERVISOR_VIRT_START;
+ struct xen_platform_parameters pp;
+
+ if (HYPERVISOR_xen_version(XENVER_platform_parameters, &pp) == 0)
+ top = pp.virt_start;
+
+ reserve_top_address(-top + 2 * PAGE_SIZE);
+}
+
/* First C function to be called on Xen boot */
asmlinkage void __init xen_start_kernel(void)
{
BUG_ON(memcmp(xen_start_info->magic, "xen-3.0", 7) != 0);
/* Install Xen paravirt ops */
- paravirt_ops = xen_paravirt_ops;
+ pv_info = xen_info;
+ pv_init_ops = xen_init_ops;
+ pv_time_ops = xen_time_ops;
+ pv_cpu_ops = xen_cpu_ops;
+ pv_irq_ops = xen_irq_ops;
+ pv_apic_ops = xen_apic_ops;
+ pv_mmu_ops = xen_mmu_ops;
+
machine_ops = xen_machine_ops;
#ifdef CONFIG_SMP
/* keep using Xen gdt for now; no urgent need to change it */
x86_write_percpu(xen_cr3, __pa(pgd));
+ x86_write_percpu(xen_current_cr3, __pa(pgd));
#ifdef CONFIG_SMP
/* Don't do the full vcpu_info placement stuff until we have a
xen_setup_vcpu_info_placement();
#endif
- paravirt_ops.kernel_rpl = 1;
+ pv_info.kernel_rpl = 1;
if (xen_feature(XENFEAT_supervisor_mode_kernel))
- paravirt_ops.kernel_rpl = 0;
+ pv_info.kernel_rpl = 0;
/* set the limit of our address space */
- reserve_top_address(-HYPERVISOR_VIRT_START + 2 * PAGE_SIZE);
+ xen_reserve_top();
/* set up basic CPUID stuff */
cpu_detect(&new_cpu_data);
projects / firefly-linux-kernel-4.4.55.git / blobdiff