Commit a94fc25b authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'for-linus-4.18-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip 

Pull xen updates from Juergen Gross:
 "This contains some minor code cleanups (fixing return types of
  functions), some fixes for Linux running as Xen PVH guest, and adding
  of a new guest resource mapping feature for Xen tools"

* tag 'for-linus-4.18-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen/PVH: Make GDT selectors PVH-specific
  xen/PVH: Set up GS segment for stack canary
  xen/store: do not store local values in xen_start_info
  xen-netfront: fix xennet_start_xmit()'s return type
  xen/privcmd: add IOCTL_PRIVCMD_MMAP_RESOURCE
  xen: Change return type to vm_fault_t
parents 68abbe72 7f47e1c5

arch/arm/xen/enlighten.c

+11 −0
Original line number Diff line number Diff line
@@ -89,6 +89,17 @@ int xen_unmap_domain_gfn_range(struct vm_area_struct *vma, 
}

EXPORT_SYMBOL_GPL(xen_unmap_domain_gfn_range);



/* Not used by XENFEAT_auto_translated guests. */

int xen_remap_domain_mfn_array(struct vm_area_struct *vma,

			       unsigned long addr,

			       xen_pfn_t *mfn, int nr,

			       int *err_ptr, pgprot_t prot,

			       unsigned int domid, struct page **pages)

{

	return -ENOSYS;

}

EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_array);



static void xen_read_wallclock(struct timespec64 *ts)

{

	u32 version;

arch/x86/xen/mmu.c

+43 −17
Original line number Diff line number Diff line
@@ -63,37 +63,44 @@ static noinline void xen_flush_tlb_all(void) 
#define REMAP_BATCH_SIZE 16



struct remap_data {

	xen_pfn_t *mfn;

	xen_pfn_t *pfn;

	bool contiguous;

	bool no_translate;

	pgprot_t prot;

	struct mmu_update *mmu_update;

};



static int remap_area_mfn_pte_fn(pte_t *ptep, pgtable_t token,

static int remap_area_pfn_pte_fn(pte_t *ptep, pgtable_t token,

				 unsigned long addr, void *data)

{

	struct remap_data *rmd = data;

	pte_t pte = pte_mkspecial(mfn_pte(*rmd->mfn, rmd->prot));

	pte_t pte = pte_mkspecial(mfn_pte(*rmd->pfn, rmd->prot));



	/* If we have a contiguous range, just update the mfn itself,

	   else update pointer to be "next mfn". */

	/*

	 * If we have a contiguous range, just update the pfn itself,

	 * else update pointer to be "next pfn".

	 */

	if (rmd->contiguous)

		(*rmd->mfn)++;

		(*rmd->pfn)++;

	else

		rmd->mfn++;

		rmd->pfn++;



	rmd->mmu_update->ptr = virt_to_machine(ptep).maddr | MMU_NORMAL_PT_UPDATE;

	rmd->mmu_update->ptr = virt_to_machine(ptep).maddr;

	rmd->mmu_update->ptr |= rmd->no_translate ?

		MMU_PT_UPDATE_NO_TRANSLATE :

		MMU_NORMAL_PT_UPDATE;

	rmd->mmu_update->val = pte_val_ma(pte);

	rmd->mmu_update++;



	return 0;

}



static int do_remap_gfn(struct vm_area_struct *vma,

static int do_remap_pfn(struct vm_area_struct *vma,

			unsigned long addr,

			xen_pfn_t *gfn, int nr,

			xen_pfn_t *pfn, int nr,

			int *err_ptr, pgprot_t prot,

			unsigned domid,

			unsigned int domid,

			bool no_translate,

			struct page **pages)

{

	int err = 0;
@@ -104,11 +111,14 @@ static int do_remap_gfn(struct vm_area_struct *vma, 


	BUG_ON(!((vma->vm_flags & (VM_PFNMAP | VM_IO)) == (VM_PFNMAP | VM_IO)));



	rmd.mfn = gfn;

	rmd.pfn = pfn;

	rmd.prot = prot;

	/* We use the err_ptr to indicate if there we are doing a contiguous

	 * mapping or a discontigious mapping. */

	/*

	 * We use the err_ptr to indicate if there we are doing a contiguous

	 * mapping or a discontigious mapping.

	 */

	rmd.contiguous = !err_ptr;

	rmd.no_translate = no_translate;



	while (nr) {

		int index = 0;
@@ -119,7 +129,7 @@ static int do_remap_gfn(struct vm_area_struct *vma, 


		rmd.mmu_update = mmu_update;

		err = apply_to_page_range(vma->vm_mm, addr, range,

					  remap_area_mfn_pte_fn, &rmd);

					  remap_area_pfn_pte_fn, &rmd);

		if (err)

			goto out;
@@ -173,7 +183,8 @@ int xen_remap_domain_gfn_range(struct vm_area_struct *vma, 
	if (xen_feature(XENFEAT_auto_translated_physmap))

		return -EOPNOTSUPP;



	return do_remap_gfn(vma, addr, &gfn, nr, NULL, prot, domid, pages);

	return do_remap_pfn(vma, addr, &gfn, nr, NULL, prot, domid, false,

			    pages);

}

EXPORT_SYMBOL_GPL(xen_remap_domain_gfn_range);
@@ -192,10 +203,25 @@ int xen_remap_domain_gfn_array(struct vm_area_struct *vma, 
	 * cause of "wrong memory was mapped in".

	 */

	BUG_ON(err_ptr == NULL);

	return do_remap_gfn(vma, addr, gfn, nr, err_ptr, prot, domid, pages);

	return do_remap_pfn(vma, addr, gfn, nr, err_ptr, prot, domid,

			    false, pages);

}

EXPORT_SYMBOL_GPL(xen_remap_domain_gfn_array);



int xen_remap_domain_mfn_array(struct vm_area_struct *vma,

			       unsigned long addr,

			       xen_pfn_t *mfn, int nr,

			       int *err_ptr, pgprot_t prot,

			       unsigned int domid, struct page **pages)

{

	if (xen_feature(XENFEAT_auto_translated_physmap))

		return -EOPNOTSUPP;



	return do_remap_pfn(vma, addr, mfn, nr, err_ptr, prot, domid,

			    true, pages);

}

EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_array);



/* Returns: 0 success */

int xen_unmap_domain_gfn_range(struct vm_area_struct *vma,

			       int nr, struct page **pages)

arch/x86/xen/xen-pvh.S

+37 −10
Original line number Diff line number Diff line
@@ -54,12 +54,19 @@ 
 * charge of setting up it's own stack, GDT and IDT.

 */



#define PVH_GDT_ENTRY_CS	1

#define PVH_GDT_ENTRY_DS	2

#define PVH_GDT_ENTRY_CANARY	3

#define PVH_CS_SEL		(PVH_GDT_ENTRY_CS * 8)

#define PVH_DS_SEL		(PVH_GDT_ENTRY_DS * 8)

#define PVH_CANARY_SEL		(PVH_GDT_ENTRY_CANARY * 8)



ENTRY(pvh_start_xen)

	cld



	lgdt (_pa(gdt))



	mov $(__BOOT_DS),%eax

	mov $PVH_DS_SEL,%eax

	mov %eax,%ds

	mov %eax,%es

	mov %eax,%ss
@@ -93,11 +100,17 @@ ENTRY(pvh_start_xen) 
	mov %eax, %cr0



	/* Jump to 64-bit mode. */

	ljmp $__KERNEL_CS, $_pa(1f)

	ljmp $PVH_CS_SEL, $_pa(1f)



	/* 64-bit entry point. */

	.code64

1:

	/* Set base address in stack canary descriptor. */

	mov $MSR_GS_BASE,%ecx

	mov $_pa(canary), %eax

	xor %edx, %edx

	wrmsr



	call xen_prepare_pvh



	/* startup_64 expects boot_params in %rsi. */
@@ -107,6 +120,17 @@ ENTRY(pvh_start_xen) 


#else /* CONFIG_X86_64 */



	/* Set base address in stack canary descriptor. */

	movl $_pa(gdt_start),%eax

	movl $_pa(canary),%ecx

	movw %cx, (PVH_GDT_ENTRY_CANARY * 8) + 2(%eax)

	shrl $16, %ecx

	movb %cl, (PVH_GDT_ENTRY_CANARY * 8) + 4(%eax)

	movb %ch, (PVH_GDT_ENTRY_CANARY * 8) + 7(%eax)



	mov $PVH_CANARY_SEL,%eax

	mov %eax,%gs



	call mk_early_pgtbl_32



	mov $_pa(initial_page_table), %eax
@@ -116,13 +140,13 @@ ENTRY(pvh_start_xen) 
	or $(X86_CR0_PG | X86_CR0_PE), %eax

	mov %eax, %cr0



	ljmp $__BOOT_CS, $1f

	ljmp $PVH_CS_SEL, $1f

1:

	call xen_prepare_pvh

	mov $_pa(pvh_bootparams), %esi



	/* startup_32 doesn't expect paging and PAE to be on. */

	ljmp $__BOOT_CS, $_pa(2f)

	ljmp $PVH_CS_SEL, $_pa(2f)

2:

	mov %cr0, %eax

	and $~X86_CR0_PG, %eax
@@ -131,7 +155,7 @@ ENTRY(pvh_start_xen) 
	and $~X86_CR4_PAE, %eax

	mov %eax, %cr4



	ljmp $__BOOT_CS, $_pa(startup_32)

	ljmp $PVH_CS_SEL, $_pa(startup_32)

#endif

END(pvh_start_xen)
@@ -143,16 +167,19 @@ gdt: 
	.word 0

gdt_start:

	.quad 0x0000000000000000            /* NULL descriptor */

	.quad 0x0000000000000000            /* reserved */

#ifdef CONFIG_X86_64

	.quad GDT_ENTRY(0xa09a, 0, 0xfffff) /* __KERNEL_CS */

	.quad GDT_ENTRY(0xa09a, 0, 0xfffff) /* PVH_CS_SEL */

#else

	.quad GDT_ENTRY(0xc09a, 0, 0xfffff) /* __KERNEL_CS */

	.quad GDT_ENTRY(0xc09a, 0, 0xfffff) /* PVH_CS_SEL */

#endif

	.quad GDT_ENTRY(0xc092, 0, 0xfffff) /* __KERNEL_DS */

	.quad GDT_ENTRY(0xc092, 0, 0xfffff) /* PVH_DS_SEL */

	.quad GDT_ENTRY(0x4090, 0, 0x18)    /* PVH_CANARY_SEL */

gdt_end:



	.balign 4

	.balign 16

canary:

	.fill 48, 1, 0



early_stack:

	.fill 256, 1, 0

early_stack_end:

drivers/net/xen-netfront.c

+1 −1
Original line number Diff line number Diff line
@@ -564,7 +564,7 @@ static u16 xennet_select_queue(struct net_device *dev, struct sk_buff *skb, 


#define MAX_XEN_SKB_FRAGS (65536 / XEN_PAGE_SIZE + 1)



static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev)

static netdev_tx_t xennet_start_xmit(struct sk_buff *skb, struct net_device *dev)

{

	struct netfront_info *np = netdev_priv(dev);

	struct netfront_stats *tx_stats = this_cpu_ptr(np->tx_stats);

drivers/xen/privcmd.c

+134 −1
Original line number Diff line number Diff line
@@ -33,6 +33,7 @@ 
#include <xen/xen.h>

#include <xen/privcmd.h>

#include <xen/interface/xen.h>

#include <xen/interface/memory.h>

#include <xen/interface/hvm/dm_op.h>

#include <xen/features.h>

#include <xen/page.h>
@@ -722,6 +723,134 @@ static long privcmd_ioctl_restrict(struct file *file, void __user *udata) 
	return 0;

}



struct remap_pfn {

	struct mm_struct *mm;

	struct page **pages;

	pgprot_t prot;

	unsigned long i;

};



static int remap_pfn_fn(pte_t *ptep, pgtable_t token, unsigned long addr,

			void *data)

{

	struct remap_pfn *r = data;

	struct page *page = r->pages[r->i];

	pte_t pte = pte_mkspecial(pfn_pte(page_to_pfn(page), r->prot));



	set_pte_at(r->mm, addr, ptep, pte);

	r->i++;



	return 0;

}



static long privcmd_ioctl_mmap_resource(struct file *file, void __user *udata)

{

	struct privcmd_data *data = file->private_data;

	struct mm_struct *mm = current->mm;

	struct vm_area_struct *vma;

	struct privcmd_mmap_resource kdata;

	xen_pfn_t *pfns = NULL;

	struct xen_mem_acquire_resource xdata;

	int rc;



	if (copy_from_user(&kdata, udata, sizeof(kdata)))

		return -EFAULT;



	/* If restriction is in place, check the domid matches */

	if (data->domid != DOMID_INVALID && data->domid != kdata.dom)

		return -EPERM;



	down_write(&mm->mmap_sem);



	vma = find_vma(mm, kdata.addr);

	if (!vma || vma->vm_ops != &privcmd_vm_ops) {

		rc = -EINVAL;

		goto out;

	}



	pfns = kcalloc(kdata.num, sizeof(*pfns), GFP_KERNEL);

	if (!pfns) {

		rc = -ENOMEM;

		goto out;

	}



	if (xen_feature(XENFEAT_auto_translated_physmap)) {

		unsigned int nr = DIV_ROUND_UP(kdata.num, XEN_PFN_PER_PAGE);

		struct page **pages;

		unsigned int i;



		rc = alloc_empty_pages(vma, nr);

		if (rc < 0)

			goto out;



		pages = vma->vm_private_data;

		for (i = 0; i < kdata.num; i++) {

			xen_pfn_t pfn =

				page_to_xen_pfn(pages[i / XEN_PFN_PER_PAGE]);



			pfns[i] = pfn + (i % XEN_PFN_PER_PAGE);

		}

	} else

		vma->vm_private_data = PRIV_VMA_LOCKED;



	memset(&xdata, 0, sizeof(xdata));

	xdata.domid = kdata.dom;

	xdata.type = kdata.type;

	xdata.id = kdata.id;

	xdata.frame = kdata.idx;

	xdata.nr_frames = kdata.num;

	set_xen_guest_handle(xdata.frame_list, pfns);



	xen_preemptible_hcall_begin();

	rc = HYPERVISOR_memory_op(XENMEM_acquire_resource, &xdata);

	xen_preemptible_hcall_end();



	if (rc)

		goto out;



	if (xen_feature(XENFEAT_auto_translated_physmap)) {

		struct remap_pfn r = {

			.mm = vma->vm_mm,

			.pages = vma->vm_private_data,

			.prot = vma->vm_page_prot,

		};



		rc = apply_to_page_range(r.mm, kdata.addr,

					 kdata.num << PAGE_SHIFT,

					 remap_pfn_fn, &r);

	} else {

		unsigned int domid =

			(xdata.flags & XENMEM_rsrc_acq_caller_owned) ?

			DOMID_SELF : kdata.dom;

		int num;



		num = xen_remap_domain_mfn_array(vma,

						 kdata.addr & PAGE_MASK,

						 pfns, kdata.num, (int *)pfns,

						 vma->vm_page_prot,

						 domid,

						 vma->vm_private_data);

		if (num < 0)

			rc = num;

		else if (num != kdata.num) {

			unsigned int i;



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

				rc = pfns[i];

				if (rc < 0)

					break;

			}

		} else

			rc = 0;

	}



out:

	up_write(&mm->mmap_sem);

	kfree(pfns);



	return rc;

}



static long privcmd_ioctl(struct file *file,

			  unsigned int cmd, unsigned long data)

{
@@ -753,6 +882,10 @@ static long privcmd_ioctl(struct file *file, 
		ret = privcmd_ioctl_restrict(file, udata);

		break;



	case IOCTL_PRIVCMD_MMAP_RESOURCE:

		ret = privcmd_ioctl_mmap_resource(file, udata);

		break;



	default:

		break;

	}
@@ -801,7 +934,7 @@ static void privcmd_close(struct vm_area_struct *vma) 
	kfree(pages);

}



static int privcmd_fault(struct vm_fault *vmf)

static vm_fault_t privcmd_fault(struct vm_fault *vmf)

{

	printk(KERN_DEBUG "privcmd_fault: vma=%p %lx-%lx, pgoff=%lx, uv=%p\n",

	       vmf->vma, vmf->vma->vm_start, vmf->vma->vm_end,

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