Merge branch 'for-rc1/xen/core' of git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen

* 'for-rc1/xen/core' of git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen:
  xen: add FIX_TEXT_POKE to fixmap
  xen: honour VCPU availability on boot
  xen: clean up gate trap/interrupt constants
  xen: set _PAGE_NX in __supported_pte_mask before pagetable construction
  xen: resume interrupts before system devices.
  xen/mmu: weaken flush_tlb_other test
  xen/mmu: some early pagetable cleanups
  Xen: Add virt_to_pfn helper function
  x86-64: remove PGE from must-have feature list
  xen: mask XSAVE from cpuid
  NULL noise: arch/x86/xen/smp.c
  xen: remove xen_load_gdt debug
  xen: make xen_load_gdt simpler
  xen: clean up xen_load_gdt
  xen: split construction of p2m mfn tables from registration
  xen: separate p2m allocation from setting
  xen: disable preempt for leave_lazy_mmu

5 files changed, 157 insertions, 57 deletions

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 82cd39a..f09e8c3 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -42,6 +42,7 @@
 #include <asm/xen/hypervisor.h>
 #include <asm/fixmap.h>
 #include <asm/processor.h>
+#include <asm/proto.h>
 #include <asm/msr-index.h>
 #include <asm/setup.h>
 #include <asm/desc.h>
@@ -168,21 +169,23 @@ static void __init xen_banner(void)
 	       xen_feature(XENFEAT_mmu_pt_update_preserve_ad) ? " (preserve-AD)" : "");
 }
 
+static __read_mostly unsigned int cpuid_leaf1_edx_mask = ~0;
+static __read_mostly unsigned int cpuid_leaf1_ecx_mask = ~0;
+
 static void xen_cpuid(unsigned int *ax, unsigned int *bx,
 		      unsigned int *cx, unsigned int *dx)
 {
+	unsigned maskecx = ~0;
 	unsigned maskedx = ~0;
 
 	/*
 	 * Mask out inconvenient features, to try and disable as many
 	 * unsupported kernel subsystems as possible.
 	 */
-	if (*ax == 1)
-		maskedx = ~((1 << X86_FEATURE_APIC) |  /* disable APIC */
-			    (1 << X86_FEATURE_ACPI) |  /* disable ACPI */
-			    (1 << X86_FEATURE_MCE)  |  /* disable MCE */
-			    (1 << X86_FEATURE_MCA)  |  /* disable MCA */
-			    (1 << X86_FEATURE_ACC));   /* thermal monitoring */
+	if (*ax == 1) {
+		maskecx = cpuid_leaf1_ecx_mask;
+		maskedx = cpuid_leaf1_edx_mask;
+	}
 
 	asm(XEN_EMULATE_PREFIX "cpuid"
 		: "=a" (*ax),
@@ -190,9 +193,43 @@ static void xen_cpuid(unsigned int *ax, unsigned int *bx,
 		  "=c" (*cx),
 		  "=d" (*dx)
 		: "0" (*ax), "2" (*cx));
+
+	*cx &= maskecx;
 	*dx &= maskedx;
 }
 
+static __init void xen_init_cpuid_mask(void)
+{
+	unsigned int ax, bx, cx, dx;
+
+	cpuid_leaf1_edx_mask =
+		~((1 << X86_FEATURE_MCE)  |  /* disable MCE */
+		  (1 << X86_FEATURE_MCA)  |  /* disable MCA */
+		  (1 << X86_FEATURE_ACC));   /* thermal monitoring */
+
+	if (!xen_initial_domain())
+		cpuid_leaf1_edx_mask &=
+			~((1 << X86_FEATURE_APIC) |  /* disable local APIC */
+			  (1 << X86_FEATURE_ACPI));  /* disable ACPI */
+
+	ax = 1;
+	xen_cpuid(&ax, &bx, &cx, &dx);
+
+	/* cpuid claims we support xsave; try enabling it to see what happens */
+	if (cx & (1 << (X86_FEATURE_XSAVE % 32))) {
+		unsigned long cr4;
+
+		set_in_cr4(X86_CR4_OSXSAVE);
+		
+		cr4 = read_cr4();
+
+		if ((cr4 & X86_CR4_OSXSAVE) == 0)
+			cpuid_leaf1_ecx_mask &= ~(1 << (X86_FEATURE_XSAVE % 32));
+
+		clear_in_cr4(X86_CR4_OSXSAVE);
+	}
+}
+
 static void xen_set_debugreg(int reg, unsigned long val)
 {
 	HYPERVISOR_set_debugreg(reg, val);
@@ -284,12 +321,11 @@ static void xen_set_ldt(const void *addr, unsigned entries)
 
 static void xen_load_gdt(const struct desc_ptr *dtr)
 {
-	unsigned long *frames;
 	unsigned long va = dtr->address;
 	unsigned int size = dtr->size + 1;
 	unsigned pages = (size + PAGE_SIZE - 1) / PAGE_SIZE;
+	unsigned long frames[pages];
 	int f;
-	struct multicall_space mcs;
 
 	/* A GDT can be up to 64k in size, which corresponds to 8192
 	   8-byte entries, or 16 4k pages.. */
@@ -297,19 +333,26 @@ static void xen_load_gdt(const struct desc_ptr *dtr)
 	BUG_ON(size > 65536);
 	BUG_ON(va & ~PAGE_MASK);
 
-	mcs = xen_mc_entry(sizeof(*frames) * pages);
-	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));
-
-	xen_mc_issue(PARAVIRT_LAZY_CPU);
+	if (HYPERVISOR_set_gdt(frames, size / sizeof(struct desc_struct)))
+		BUG();
 }
 
 static void load_TLS_descriptor(struct thread_struct *t,
@@ -385,7 +428,7 @@ static void xen_write_ldt_entry(struct desc_struct *dt, int entrynum,
 static int cvt_gate_to_trap(int vector, const gate_desc *val,
 			    struct trap_info *info)
 {
-	if (val->type != 0xf && val->type != 0xe)
+	if (val->type != GATE_TRAP && val->type != GATE_INTERRUPT)
 		return 0;
 
 	info->vector = vector;
@@ -393,8 +436,8 @@ static int cvt_gate_to_trap(int vector, const gate_desc *val,
 	info->cs = gate_segment(*val);
 	info->flags = val->dpl;
 	/* interrupt gates clear IF */
-	if (val->type == 0xe)
-		info->flags |= 4;
+	if (val->type == GATE_INTERRUPT)
+		info->flags |= 1 << 2;
 
 	return 1;
 }
@@ -872,7 +915,6 @@ static const struct machine_ops __initdata xen_machine_ops = {
 	.emergency_restart = xen_emergency_restart,
 };
 
-
 /* First C function to be called on Xen boot */
 asmlinkage void __init xen_start_kernel(void)
 {
@@ -897,6 +939,8 @@ asmlinkage void __init xen_start_kernel(void)
 
 	xen_init_irq_ops();
 
+	xen_init_cpuid_mask();
+
 #ifdef CONFIG_X86_LOCAL_APIC
 	/*
 	 * set up the basic apic ops.
@@ -938,6 +982,11 @@ asmlinkage void __init xen_start_kernel(void)
 	if (!xen_initial_domain())
 		__supported_pte_mask &= ~(_PAGE_PWT | _PAGE_PCD);
 
+#ifdef CONFIG_X86_64
+	/* Work out if we support NX */
+	check_efer();
+#endif
+
 	/* Don't do the full vcpu_info placement stuff until we have a
 	   possible map and a non-dummy shared_info. */
 	per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0];
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 2a81838..9842b12 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -184,7 +184,7 @@ static inline unsigned p2m_index(unsigned long pfn)
 }
 
 /* Build the parallel p2m_top_mfn structures */
-void xen_setup_mfn_list_list(void)
+static void __init xen_build_mfn_list_list(void)
 {
 	unsigned pfn, idx;
 
@@ -198,7 +198,10 @@ void xen_setup_mfn_list_list(void)
 		unsigned topidx = idx * P2M_ENTRIES_PER_PAGE;
 		p2m_top_mfn_list[idx] = virt_to_mfn(&p2m_top_mfn[topidx]);
 	}
+}
 
+void xen_setup_mfn_list_list(void)
+{
 	BUG_ON(HYPERVISOR_shared_info == &xen_dummy_shared_info);
 
 	HYPERVISOR_shared_info->arch.pfn_to_mfn_frame_list_list =
@@ -218,6 +221,8 @@ void __init xen_build_dynamic_phys_to_machine(void)
 
 		p2m_top[topidx] = &mfn_list[pfn];
 	}
+
+	xen_build_mfn_list_list();
 }
 
 unsigned long get_phys_to_machine(unsigned long pfn)
@@ -233,47 +238,74 @@ unsigned long get_phys_to_machine(unsigned long pfn)
 }
 EXPORT_SYMBOL_GPL(get_phys_to_machine);
 
-static void alloc_p2m(unsigned long **pp, unsigned long *mfnp)
+/* install a  new p2m_top page */
+bool install_p2mtop_page(unsigned long pfn, unsigned long *p)
 {
-	unsigned long *p;
+	unsigned topidx = p2m_top_index(pfn);
+	unsigned long **pfnp, *mfnp;
 	unsigned i;
 
-	p = (void *)__get_free_page(GFP_KERNEL | __GFP_NOFAIL);
-	BUG_ON(p == NULL);
+	pfnp = &p2m_top[topidx];
+	mfnp = &p2m_top_mfn[topidx];
 
 	for (i = 0; i < P2M_ENTRIES_PER_PAGE; i++)
 		p[i] = INVALID_P2M_ENTRY;
 
-	if (cmpxchg(pp, p2m_missing, p) != p2m_missing)
-		free_page((unsigned long)p);
-	else
+	if (cmpxchg(pfnp, p2m_missing, p) == p2m_missing) {
 		*mfnp = virt_to_mfn(p);
+		return true;
+	}
+
+	return false;
 }
 
-void set_phys_to_machine(unsigned long pfn, unsigned long mfn)
+static void alloc_p2m(unsigned long pfn)
 {
-	unsigned topidx, idx;
+	unsigned long *p;
 
-	if (unlikely(xen_feature(XENFEAT_auto_translated_physmap))) {
-		BUG_ON(pfn != mfn && mfn != INVALID_P2M_ENTRY);
-		return;
-	}
+	p = (void *)__get_free_page(GFP_KERNEL | __GFP_NOFAIL);
+	BUG_ON(p == NULL);
+
+	if (!install_p2mtop_page(pfn, p))
+		free_page((unsigned long)p);
+}
+
+/* Try to install p2m mapping; fail if intermediate bits missing */
+bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn)
+{
+	unsigned topidx, idx;
 
 	if (unlikely(pfn >= MAX_DOMAIN_PAGES)) {
 		BUG_ON(mfn != INVALID_P2M_ENTRY);
-		return;
+		return true;
 	}
 
 	topidx = p2m_top_index(pfn);
 	if (p2m_top[topidx] == p2m_missing) {
-		/* no need to allocate a page to store an invalid entry */
 		if (mfn == INVALID_P2M_ENTRY)
-			return;
-		alloc_p2m(&p2m_top[topidx], &p2m_top_mfn[topidx]);
+			return true;
+		return false;
 	}
 
 	idx = p2m_index(pfn);
 	p2m_top[topidx][idx] = mfn;
+
+	return true;
+}
+
+void set_phys_to_machine(unsigned long pfn, unsigned long mfn)
+{
+	if (unlikely(xen_feature(XENFEAT_auto_translated_physmap))) {
+		BUG_ON(pfn != mfn && mfn != INVALID_P2M_ENTRY);
+		return;
+	}
+
+	if (unlikely(!__set_phys_to_machine(pfn, mfn)))  {
+		alloc_p2m(pfn);
+
+		if (!__set_phys_to_machine(pfn, mfn))
+			BUG();
+	}
 }
 
 unsigned long arbitrary_virt_to_mfn(void *vaddr)
@@ -987,7 +1019,7 @@ static __init int xen_mark_pinned(struct mm_struct *mm, struct page *page,
 	return 0;
 }
 
-void __init xen_mark_init_mm_pinned(void)
+static void __init xen_mark_init_mm_pinned(void)
 {
 	xen_pgd_walk(&init_mm, xen_mark_pinned, FIXADDR_TOP);
 }
@@ -1270,8 +1302,8 @@ static void xen_flush_tlb_others(const struct cpumask *cpus,
 	} *args;
 	struct multicall_space mcs;
 
-	BUG_ON(cpumask_empty(cpus));
-	BUG_ON(!mm);
+	if (cpumask_empty(cpus))
+		return;		/* nothing to do */
 
 	mcs = xen_mc_entry(sizeof(*args));
 	args = mcs.args;
@@ -1438,6 +1470,15 @@ static __init void xen_set_pte_init(pte_t *ptep, pte_t pte)
 }
 #endif
 
+static void pin_pagetable_pfn(unsigned cmd, unsigned long pfn)
+{
+	struct mmuext_op op;
+	op.cmd = cmd;
+	op.arg1.mfn = pfn_to_mfn(pfn);
+	if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF))
+		BUG();
+}
+
 /* Early in boot, while setting up the initial pagetable, assume
    everything is pinned. */
 static __init void xen_alloc_pte_init(struct mm_struct *mm, unsigned long pfn)
@@ -1446,22 +1487,29 @@ static __init void xen_alloc_pte_init(struct mm_struct *mm, unsigned long pfn)
 	BUG_ON(mem_map);	/* should only be used early */
 #endif
 	make_lowmem_page_readonly(__va(PFN_PHYS(pfn)));
+	pin_pagetable_pfn(MMUEXT_PIN_L1_TABLE, pfn);
+}
+
+/* Used for pmd and pud */
+static __init void xen_alloc_pmd_init(struct mm_struct *mm, unsigned long pfn)
+{
+#ifdef CONFIG_FLATMEM
+	BUG_ON(mem_map);	/* should only be used early */
+#endif
+	make_lowmem_page_readonly(__va(PFN_PHYS(pfn)));
 }
 
 /* Early release_pte assumes that all pts are pinned, since there's
    only init_mm and anything attached to that is pinned. */
-static void xen_release_pte_init(unsigned long pfn)
+static __init void xen_release_pte_init(unsigned long pfn)
 {
+	pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, pfn);
 	make_lowmem_page_readwrite(__va(PFN_PHYS(pfn)));
 }
 
-static void pin_pagetable_pfn(unsigned cmd, unsigned long pfn)
+static __init void xen_release_pmd_init(unsigned long pfn)
 {
-	struct mmuext_op op;
-	op.cmd = cmd;
-	op.arg1.mfn = pfn_to_mfn(pfn);
-	if (HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF))
-		BUG();
+	make_lowmem_page_readwrite(__va(PFN_PHYS(pfn)));
 }
 
 /* This needs to make sure the new pte page is pinned iff its being
@@ -1773,6 +1821,9 @@ static void xen_set_fixmap(unsigned idx, phys_addr_t phys, pgprot_t prot)
 #ifdef CONFIG_X86_LOCAL_APIC
 	case FIX_APIC_BASE:	/* maps dummy local APIC */
 #endif
+	case FIX_TEXT_POKE0:
+	case FIX_TEXT_POKE1:
+		/* All local page mappings */
 		pte = pfn_pte(phys, prot);
 		break;
 
@@ -1819,7 +1870,6 @@ __init void xen_post_allocator_init(void)
 	xen_mark_init_mm_pinned();
 }
 
-
 const struct pv_mmu_ops xen_mmu_ops __initdata = {
 	.pagetable_setup_start = xen_pagetable_setup_start,
 	.pagetable_setup_done = xen_pagetable_setup_done,
@@ -1843,9 +1893,9 @@ const struct pv_mmu_ops xen_mmu_ops __initdata = {
 
 	.alloc_pte = xen_alloc_pte_init,
 	.release_pte = xen_release_pte_init,
-	.alloc_pmd = xen_alloc_pte_init,
+	.alloc_pmd = xen_alloc_pmd_init,
 	.alloc_pmd_clone = paravirt_nop,
-	.release_pmd = xen_release_pte_init,
+	.release_pmd = xen_release_pmd_init,
 
 #ifdef CONFIG_HIGHPTE
 	.kmap_atomic_pte = xen_kmap_atomic_pte,
@@ -1883,8 +1933,8 @@ const struct pv_mmu_ops xen_mmu_ops __initdata = {
 	.make_pud = PV_CALLEE_SAVE(xen_make_pud),
 	.set_pgd = xen_set_pgd_hyper,
 
-	.alloc_pud = xen_alloc_pte_init,
-	.release_pud = xen_release_pte_init,
+	.alloc_pud = xen_alloc_pmd_init,
+	.release_pud = xen_release_pmd_init,
 #endif	/* PAGETABLE_LEVELS == 4 */
 
 	.activate_mm = xen_activate_mm,
diff --git a/arch/x86/xen/mmu.h b/arch/x86/xen/mmu.h
index 24d1b44..da73026 100644
--- a/arch/x86/xen/mmu.h
+++ b/arch/x86/xen/mmu.h
@@ -11,6 +11,9 @@ enum pt_level {
 };
 
 
+bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn);
+bool install_p2mtop_page(unsigned long pfn, unsigned long *p);
+
 void set_pte_mfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags);
 
 
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index 585a6e3..429834e 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -317,7 +317,7 @@ static int __cpuinit xen_cpu_up(unsigned int cpu)
 	BUG_ON(rc);
 
 	while(per_cpu(cpu_state, cpu) != CPU_ONLINE) {
-		HYPERVISOR_sched_op(SCHEDOP_yield, 0);
+		HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
 		barrier();
 	}
 
@@ -422,7 +422,7 @@ static void xen_smp_send_call_function_ipi(const struct cpumask *mask)
 	/* Make sure other vcpus get a chance to run if they need to. */
 	for_each_cpu(cpu, mask) {
 		if (xen_vcpu_stolen(cpu)) {
-			HYPERVISOR_sched_op(SCHEDOP_yield, 0);
+			HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
 			break;
 		}
 	}
diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h
index 2f5ef26..2013946 100644
--- a/arch/x86/xen/xen-ops.h
+++ b/arch/x86/xen/xen-ops.h
@@ -57,8 +57,6 @@ irqreturn_t xen_debug_interrupt(int irq, void *dev_id);
 
 bool xen_vcpu_stolen(int vcpu);
 
-void xen_mark_init_mm_pinned(void);
-
 void xen_setup_vcpu_info_placement(void);
 
 #ifdef CONFIG_SMP