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Commit 613d4cef authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'stable/for-linus-3.19-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip 

Pull xen bug fixes from David Vrabel:
 "Several critical linear p2m fixes that prevented some hosts from
  booting"

* tag 'stable/for-linus-3.19-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  x86/xen: properly retrieve NMI reason
  xen: check for zero sized area when invalidating memory
  xen: use correct type for physical addresses
  xen: correct race in alloc_p2m_pmd()
  xen: correct error for building p2m list on 32 bits
  x86/xen: avoid freeing static 'name' when kasprintf() fails
  x86/xen: add extra memory for remapped frames during setup
  x86/xen: don't count how many PFNs are identity mapped
  x86/xen: Free bootmem in free_p2m_page() during early boot
  x86/xen: Remove unnecessary BUG_ON(preemptible()) in xen_setup_timer()
parents 4f7a42de f221b04f

arch/x86/xen/enlighten.c

+21 −1
Original line number Diff line number Diff line
@@ -40,6 +40,7 @@ 
#include <xen/interface/physdev.h>

#include <xen/interface/vcpu.h>

#include <xen/interface/memory.h>

#include <xen/interface/nmi.h>

#include <xen/interface/xen-mca.h>

#include <xen/features.h>

#include <xen/page.h>
@@ -66,6 +67,7 @@ 
#include <asm/reboot.h>

#include <asm/stackprotector.h>

#include <asm/hypervisor.h>

#include <asm/mach_traps.h>

#include <asm/mwait.h>

#include <asm/pci_x86.h>

#include <asm/pat.h>
@@ -1351,6 +1353,21 @@ static const struct machine_ops xen_machine_ops __initconst = { 
	.emergency_restart = xen_emergency_restart,

};



static unsigned char xen_get_nmi_reason(void)

{

	unsigned char reason = 0;



	/* Construct a value which looks like it came from port 0x61. */

	if (test_bit(_XEN_NMIREASON_io_error,

		     &HYPERVISOR_shared_info->arch.nmi_reason))

		reason |= NMI_REASON_IOCHK;

	if (test_bit(_XEN_NMIREASON_pci_serr,

		     &HYPERVISOR_shared_info->arch.nmi_reason))

		reason |= NMI_REASON_SERR;



	return reason;

}



static void __init xen_boot_params_init_edd(void)

{

#if IS_ENABLED(CONFIG_EDD)
@@ -1535,9 +1552,12 @@ asmlinkage __visible void __init xen_start_kernel(void) 
	pv_info = xen_info;

	pv_init_ops = xen_init_ops;

	pv_apic_ops = xen_apic_ops;

	if (!xen_pvh_domain())

	if (!xen_pvh_domain()) {

		pv_cpu_ops = xen_cpu_ops;



		x86_platform.get_nmi_reason = xen_get_nmi_reason;

	}



	if (xen_feature(XENFEAT_auto_translated_physmap))

		x86_init.resources.memory_setup = xen_auto_xlated_memory_setup;

	else

arch/x86/xen/p2m.c

+10 −10
Original line number Diff line number Diff line
@@ -167,10 +167,13 @@ static void * __ref alloc_p2m_page(void) 
	return (void *)__get_free_page(GFP_KERNEL | __GFP_REPEAT);

}



/* Only to be called in case of a race for a page just allocated! */

static void free_p2m_page(void *p)

static void __ref free_p2m_page(void *p)

{

	BUG_ON(!slab_is_available());

	if (unlikely(!slab_is_available())) {

		free_bootmem((unsigned long)p, PAGE_SIZE);

		return;

	}



	free_page((unsigned long)p);

}
@@ -375,7 +378,7 @@ static void __init xen_rebuild_p2m_list(unsigned long *p2m) 
			p2m_missing_pte : p2m_identity_pte;

		for (i = 0; i < PMDS_PER_MID_PAGE; i++) {

			pmdp = populate_extra_pmd(

				(unsigned long)(p2m + pfn + i * PTRS_PER_PTE));

				(unsigned long)(p2m + pfn) + i * PMD_SIZE);

			set_pmd(pmdp, __pmd(__pa(ptep) | _KERNPG_TABLE));

		}

	}
@@ -436,10 +439,9 @@ EXPORT_SYMBOL_GPL(get_phys_to_machine); 
 * a new pmd is to replace p2m_missing_pte or p2m_identity_pte by a individual

 * pmd. In case of PAE/x86-32 there are multiple pmds to allocate!

 */

static pte_t *alloc_p2m_pmd(unsigned long addr, pte_t *ptep, pte_t *pte_pg)

static pte_t *alloc_p2m_pmd(unsigned long addr, pte_t *pte_pg)

{

	pte_t *ptechk;

	pte_t *pteret = ptep;

	pte_t *pte_newpg[PMDS_PER_MID_PAGE];

	pmd_t *pmdp;

	unsigned int level;
@@ -473,8 +475,6 @@ static pte_t *alloc_p2m_pmd(unsigned long addr, pte_t *ptep, pte_t *pte_pg) 
		if (ptechk == pte_pg) {

			set_pmd(pmdp,

				__pmd(__pa(pte_newpg[i]) | _KERNPG_TABLE));

			if (vaddr == (addr & ~(PMD_SIZE - 1)))

				pteret = pte_offset_kernel(pmdp, addr);

			pte_newpg[i] = NULL;

		}
@@ -488,7 +488,7 @@ static pte_t *alloc_p2m_pmd(unsigned long addr, pte_t *ptep, pte_t *pte_pg) 
		vaddr += PMD_SIZE;

	}



	return pteret;

	return lookup_address(addr, &level);

}



/*
@@ -517,7 +517,7 @@ static bool alloc_p2m(unsigned long pfn) 


	if (pte_pg == p2m_missing_pte || pte_pg == p2m_identity_pte) {

		/* PMD level is missing, allocate a new one */

		ptep = alloc_p2m_pmd(addr, ptep, pte_pg);

		ptep = alloc_p2m_pmd(addr, pte_pg);

		if (!ptep)

			return false;

	}

arch/x86/xen/setup.c

+20 −22
Original line number Diff line number Diff line
@@ -140,7 +140,7 @@ static void __init xen_del_extra_mem(u64 start, u64 size) 
unsigned long __ref xen_chk_extra_mem(unsigned long pfn)

{

	int i;

	unsigned long addr = PFN_PHYS(pfn);

	phys_addr_t addr = PFN_PHYS(pfn);



	for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {

		if (addr >= xen_extra_mem[i].start &&
@@ -160,6 +160,8 @@ void __init xen_inv_extra_mem(void) 
	int i;



	for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {

		if (!xen_extra_mem[i].size)

			continue;

		pfn_s = PFN_DOWN(xen_extra_mem[i].start);

		pfn_e = PFN_UP(xen_extra_mem[i].start + xen_extra_mem[i].size);

		for (pfn = pfn_s; pfn < pfn_e; pfn++)
@@ -229,15 +231,14 @@ static int __init xen_free_mfn(unsigned long mfn) 
 * as a fallback if the remapping fails.

 */

static void __init xen_set_identity_and_release_chunk(unsigned long start_pfn,

	unsigned long end_pfn, unsigned long nr_pages, unsigned long *identity,

	unsigned long *released)

	unsigned long end_pfn, unsigned long nr_pages, unsigned long *released)

{

	unsigned long len = 0;

	unsigned long pfn, end;

	int ret;



	WARN_ON(start_pfn > end_pfn);



	/* Release pages first. */

	end = min(end_pfn, nr_pages);

	for (pfn = start_pfn; pfn < end; pfn++) {

		unsigned long mfn = pfn_to_mfn(pfn);
@@ -250,16 +251,14 @@ static void __init xen_set_identity_and_release_chunk(unsigned long start_pfn, 
		WARN(ret != 1, "Failed to release pfn %lx err=%d\n", pfn, ret);



		if (ret == 1) {

			(*released)++;

			if (!__set_phys_to_machine(pfn, INVALID_P2M_ENTRY))

				break;

			len++;

		} else

			break;

	}



	/* Need to release pages first */

	*released += len;

	*identity += set_phys_range_identity(start_pfn, end_pfn);

	set_phys_range_identity(start_pfn, end_pfn);

}



/*
@@ -287,7 +286,7 @@ static void __init xen_update_mem_tables(unsigned long pfn, unsigned long mfn) 
	}



	/* Update kernel mapping, but not for highmem. */

	if ((pfn << PAGE_SHIFT) >= __pa(high_memory))

	if (pfn >= PFN_UP(__pa(high_memory - 1)))

		return;



	if (HYPERVISOR_update_va_mapping((unsigned long)__va(pfn << PAGE_SHIFT),
@@ -318,7 +317,6 @@ static void __init xen_do_set_identity_and_remap_chunk( 
	unsigned long ident_pfn_iter, remap_pfn_iter;

	unsigned long ident_end_pfn = start_pfn + size;

	unsigned long left = size;

	unsigned long ident_cnt = 0;

	unsigned int i, chunk;



	WARN_ON(size == 0);
@@ -347,8 +345,7 @@ static void __init xen_do_set_identity_and_remap_chunk( 
		xen_remap_mfn = mfn;



		/* Set identity map */

		ident_cnt += set_phys_range_identity(ident_pfn_iter,

			ident_pfn_iter + chunk);

		set_phys_range_identity(ident_pfn_iter, ident_pfn_iter + chunk);



		left -= chunk;

	}
@@ -371,7 +368,7 @@ static void __init xen_do_set_identity_and_remap_chunk( 
static unsigned long __init xen_set_identity_and_remap_chunk(

        const struct e820entry *list, size_t map_size, unsigned long start_pfn,

	unsigned long end_pfn, unsigned long nr_pages, unsigned long remap_pfn,

	unsigned long *identity, unsigned long *released)

	unsigned long *released, unsigned long *remapped)

{

	unsigned long pfn;

	unsigned long i = 0;
@@ -386,8 +383,7 @@ static unsigned long __init xen_set_identity_and_remap_chunk( 
		/* Do not remap pages beyond the current allocation */

		if (cur_pfn >= nr_pages) {

			/* Identity map remaining pages */

			*identity += set_phys_range_identity(cur_pfn,

				cur_pfn + size);

			set_phys_range_identity(cur_pfn, cur_pfn + size);

			break;

		}

		if (cur_pfn + size > nr_pages)
@@ -398,7 +394,7 @@ static unsigned long __init xen_set_identity_and_remap_chunk( 
		if (!remap_range_size) {

			pr_warning("Unable to find available pfn range, not remapping identity pages\n");

			xen_set_identity_and_release_chunk(cur_pfn,

				cur_pfn + left, nr_pages, identity, released);

				cur_pfn + left, nr_pages, released);

			break;

		}

		/* Adjust size to fit in current e820 RAM region */
@@ -410,7 +406,7 @@ static unsigned long __init xen_set_identity_and_remap_chunk( 
		/* Update variables to reflect new mappings. */

		i += size;

		remap_pfn += size;

		*identity += size;

		*remapped += size;

	}



	/*
@@ -427,13 +423,13 @@ static unsigned long __init xen_set_identity_and_remap_chunk( 


static void __init xen_set_identity_and_remap(

	const struct e820entry *list, size_t map_size, unsigned long nr_pages,

	unsigned long *released)

	unsigned long *released, unsigned long *remapped)

{

	phys_addr_t start = 0;

	unsigned long identity = 0;

	unsigned long last_pfn = nr_pages;

	const struct e820entry *entry;

	unsigned long num_released = 0;

	unsigned long num_remapped = 0;

	int i;



	/*
@@ -460,14 +456,14 @@ static void __init xen_set_identity_and_remap( 
				last_pfn = xen_set_identity_and_remap_chunk(

						list, map_size, start_pfn,

						end_pfn, nr_pages, last_pfn,

						&identity, &num_released);

						&num_released, &num_remapped);

			start = end;

		}

	}



	*released = num_released;

	*remapped = num_remapped;



	pr_info("Set %ld page(s) to 1-1 mapping\n", identity);

	pr_info("Released %ld page(s)\n", num_released);

}
@@ -586,6 +582,7 @@ char * __init xen_memory_setup(void) 
	struct xen_memory_map memmap;

	unsigned long max_pages;

	unsigned long extra_pages = 0;

	unsigned long remapped_pages;

	int i;

	int op;
@@ -635,9 +632,10 @@ char * __init xen_memory_setup(void) 
	 * underlying RAM.

	 */

	xen_set_identity_and_remap(map, memmap.nr_entries, max_pfn,

				   &xen_released_pages);

				   &xen_released_pages, &remapped_pages);



	extra_pages += xen_released_pages;

	extra_pages += remapped_pages;



	/*

	 * Clamp the amount of extra memory to a EXTRA_MEM_RATIO

arch/x86/xen/time.c

+5 −13
Original line number Diff line number Diff line
@@ -391,7 +391,7 @@ static const struct clock_event_device *xen_clockevent = 


struct xen_clock_event_device {

	struct clock_event_device evt;

	char *name;

	char name[16];

};

static DEFINE_PER_CPU(struct xen_clock_event_device, xen_clock_events) = { .evt.irq = -1 };
@@ -420,46 +420,38 @@ void xen_teardown_timer(int cpu) 
	if (evt->irq >= 0) {

		unbind_from_irqhandler(evt->irq, NULL);

		evt->irq = -1;

		kfree(per_cpu(xen_clock_events, cpu).name);

		per_cpu(xen_clock_events, cpu).name = NULL;

	}

}



void xen_setup_timer(int cpu)

{

	char *name;

	struct clock_event_device *evt;

	struct xen_clock_event_device *xevt = &per_cpu(xen_clock_events, cpu);

	struct clock_event_device *evt = &xevt->evt;

	int irq;



	evt = &per_cpu(xen_clock_events, cpu).evt;

	WARN(evt->irq >= 0, "IRQ%d for CPU%d is already allocated\n", evt->irq, cpu);

	if (evt->irq >= 0)

		xen_teardown_timer(cpu);



	printk(KERN_INFO "installing Xen timer for CPU %d\n", cpu);



	name = kasprintf(GFP_KERNEL, "timer%d", cpu);

	if (!name)

		name = "<timer kasprintf failed>";

	snprintf(xevt->name, sizeof(xevt->name), "timer%d", cpu);



	irq = bind_virq_to_irqhandler(VIRQ_TIMER, cpu, xen_timer_interrupt,

				      IRQF_PERCPU|IRQF_NOBALANCING|IRQF_TIMER|

				      IRQF_FORCE_RESUME|IRQF_EARLY_RESUME,

				      name, NULL);

				      xevt->name, NULL);

	(void)xen_set_irq_priority(irq, XEN_IRQ_PRIORITY_MAX);



	memcpy(evt, xen_clockevent, sizeof(*evt));



	evt->cpumask = cpumask_of(cpu);

	evt->irq = irq;

	per_cpu(xen_clock_events, cpu).name = name;

}





void xen_setup_cpu_clockevents(void)

{

	BUG_ON(preemptible());



	clockevents_register_device(this_cpu_ptr(&xen_clock_events.evt));

}

include/xen/interface/nmi.h

0 → 100644
+51 −0
Original line number Diff line number Diff line 
/******************************************************************************

 * nmi.h

 *

 * NMI callback registration and reason codes.

 *

 * Copyright (c) 2005, Keir Fraser <keir@xensource.com>

 */



#ifndef __XEN_PUBLIC_NMI_H__

#define __XEN_PUBLIC_NMI_H__



#include <xen/interface/xen.h>



/*

 * NMI reason codes:

 * Currently these are x86-specific, stored in arch_shared_info.nmi_reason.

 */

 /* I/O-check error reported via ISA port 0x61, bit 6. */

#define _XEN_NMIREASON_io_error     0

#define XEN_NMIREASON_io_error      (1UL << _XEN_NMIREASON_io_error)

 /* PCI SERR reported via ISA port 0x61, bit 7. */

#define _XEN_NMIREASON_pci_serr     1

#define XEN_NMIREASON_pci_serr      (1UL << _XEN_NMIREASON_pci_serr)

 /* Unknown hardware-generated NMI. */

#define _XEN_NMIREASON_unknown      2

#define XEN_NMIREASON_unknown       (1UL << _XEN_NMIREASON_unknown)



/*

 * long nmi_op(unsigned int cmd, void *arg)

 * NB. All ops return zero on success, else a negative error code.

 */



/*

 * Register NMI callback for this (calling) VCPU. Currently this only makes

 * sense for domain 0, vcpu 0. All other callers will be returned EINVAL.

 * arg == pointer to xennmi_callback structure.

 */

#define XENNMI_register_callback   0

struct xennmi_callback {

    unsigned long handler_address;

    unsigned long pad;

};

DEFINE_GUEST_HANDLE_STRUCT(xennmi_callback);



/*

 * Deregister NMI callback for this (calling) VCPU.

 * arg == NULL.

 */

#define XENNMI_unregister_callback 1



#endif /* __XEN_PUBLIC_NMI_H__ */