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[Xen-devel] [PATCH] [v3] xen: avoid link error on ARM

Arnd Bergmann posted 1 patch 4 years, 9 months ago
Failed in applying to current master (apply log)
drivers/xen/privcmd.c   | 35 +++++------------------------------
drivers/xen/xlate_mmu.c | 32 ++++++++++++++++++++++++++++++++
include/xen/xen-ops.h   |  3 +++
3 files changed, 40 insertions(+), 30 deletions(-)
[Xen-devel] [PATCH] [v3] xen: avoid link error on ARM
Posted by Arnd Bergmann 4 years, 9 months ago 
Building the privcmd code as a loadable module on ARM, we get
a link error due to the private cache management functions:

ERROR: "__sync_icache_dcache" [drivers/xen/xen-privcmd.ko] undefined!

Move the code into a new that is always built in when Xen is enabled,
as suggested by Juergen Gross and Boris Ostrovsky.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
v2: rename mm.o to xen-builtin.o, make it unconditional
v3: move new code into xlate_mmu as suggested by Boris Ostrovsky.
    sorry for the long delay since v2, I lost track of this.
---
 drivers/xen/privcmd.c   | 35 +++++------------------------------
 drivers/xen/xlate_mmu.c | 32 ++++++++++++++++++++++++++++++++
 include/xen/xen-ops.h   |  3 +++
 3 files changed, 40 insertions(+), 30 deletions(-)

diff --git a/drivers/xen/privcmd.c b/drivers/xen/privcmd.c
index 2f5ce7230a43..c6070e70dd73 100644
--- a/drivers/xen/privcmd.c
+++ b/drivers/xen/privcmd.c
@@ -724,25 +724,6 @@ 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, 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;
@@ -774,7 +755,8 @@ static long privcmd_ioctl_mmap_resource(struct file *file, void __user *udata)
 		goto out;
 	}
 
-	if (xen_feature(XENFEAT_auto_translated_physmap)) {
+	if (IS_ENABLED(CONFIG_XEN_AUTO_XLATE) &&
+	    xen_feature(XENFEAT_auto_translated_physmap)) {
 		unsigned int nr = DIV_ROUND_UP(kdata.num, XEN_PFN_PER_PAGE);
 		struct page **pages;
 		unsigned int i;
@@ -808,16 +790,9 @@ static long privcmd_ioctl_mmap_resource(struct file *file, void __user *udata)
 	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);
+	if (IS_ENABLED(CONFIG_XEN_AUTO_XLATE) &&
+	    xen_feature(XENFEAT_auto_translated_physmap)) {
+		rc = xen_remap_vma_range(vma, kdata.addr, kdata.num << PAGE_SHIFT);
 	} else {
 		unsigned int domid =
 			(xdata.flags & XENMEM_rsrc_acq_caller_owned) ?
diff --git a/drivers/xen/xlate_mmu.c b/drivers/xen/xlate_mmu.c
index ba883a80b3c0..7b1077f0abcb 100644
--- a/drivers/xen/xlate_mmu.c
+++ b/drivers/xen/xlate_mmu.c
@@ -262,3 +262,35 @@ int __init xen_xlate_map_ballooned_pages(xen_pfn_t **gfns, void **virt,
 	return 0;
 }
 EXPORT_SYMBOL_GPL(xen_xlate_map_ballooned_pages);
+
+struct remap_pfn {
+	struct mm_struct *mm;
+	struct page **pages;
+	pgprot_t prot;
+	unsigned long i;
+};
+
+static int remap_pfn_fn(pte_t *ptep, 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;
+}
+
+/* Used by the privcmd module, but has to be built-in on ARM */
+int xen_remap_vma_range(struct vm_area_struct *vma, unsigned long addr, unsigned long len)
+{
+	struct remap_pfn r = {
+		.mm = vma->vm_mm,
+		.pages = vma->vm_private_data,
+		.prot = vma->vm_page_prot,
+	};
+
+	return apply_to_page_range(vma->vm_mm, addr, len, remap_pfn_fn, &r);
+}
+EXPORT_SYMBOL_GPL(xen_remap_vma_range);
diff --git a/include/xen/xen-ops.h b/include/xen/xen-ops.h
index 4969817124a8..98b30c1613b2 100644
--- a/include/xen/xen-ops.h
+++ b/include/xen/xen-ops.h
@@ -109,6 +109,9 @@ static inline int xen_xlate_unmap_gfn_range(struct vm_area_struct *vma,
 }
 #endif
 
+int xen_remap_vma_range(struct vm_area_struct *vma, unsigned long addr,
+			unsigned long len);
+
 /*
  * xen_remap_domain_gfn_array() - map an array of foreign frames by gfn
  * @vma:     VMA to map the pages into
-- 
2.20.0


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Re: [Xen-devel] [PATCH] [v3] xen: avoid link error on ARM
Posted by Stefano Stabellini 4 years, 9 months ago 
On Mon, 22 Jul 2019, Arnd Bergmann wrote:
> Building the privcmd code as a loadable module on ARM, we get
> a link error due to the private cache management functions:
> 
> ERROR: "__sync_icache_dcache" [drivers/xen/xen-privcmd.ko] undefined!
> 
> Move the code into a new that is always built in when Xen is enabled,
> as suggested by Juergen Gross and Boris Ostrovsky.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
> v2: rename mm.o to xen-builtin.o, make it unconditional
> v3: move new code into xlate_mmu as suggested by Boris Ostrovsky.
>     sorry for the long delay since v2, I lost track of this.
> ---
>  drivers/xen/privcmd.c   | 35 +++++------------------------------
>  drivers/xen/xlate_mmu.c | 32 ++++++++++++++++++++++++++++++++
>  include/xen/xen-ops.h   |  3 +++
>  3 files changed, 40 insertions(+), 30 deletions(-)
> 
> diff --git a/drivers/xen/privcmd.c b/drivers/xen/privcmd.c
> index 2f5ce7230a43..c6070e70dd73 100644
> --- a/drivers/xen/privcmd.c
> +++ b/drivers/xen/privcmd.c
> @@ -724,25 +724,6 @@ 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, 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;
> @@ -774,7 +755,8 @@ static long privcmd_ioctl_mmap_resource(struct file *file, void __user *udata)
>  		goto out;
>  	}
>  
> -	if (xen_feature(XENFEAT_auto_translated_physmap)) {
> +	if (IS_ENABLED(CONFIG_XEN_AUTO_XLATE) &&
> +	    xen_feature(XENFEAT_auto_translated_physmap)) {

The patch looks good. I tested it and works as intended. Instead of
adding the additional IS_ENABLED check, I would have gone with providing
an empty implementation of xen_remap_vma_range as a static inline
function, if CONFIG_XEN_AUTO_XLATE is not enabled.

Either way:

Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>


>  		unsigned int nr = DIV_ROUND_UP(kdata.num, XEN_PFN_PER_PAGE);
>  		struct page **pages;
>  		unsigned int i;
> @@ -808,16 +790,9 @@ static long privcmd_ioctl_mmap_resource(struct file *file, void __user *udata)
>  	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);
> +	if (IS_ENABLED(CONFIG_XEN_AUTO_XLATE) &&
> +	    xen_feature(XENFEAT_auto_translated_physmap)) {
> +		rc = xen_remap_vma_range(vma, kdata.addr, kdata.num << PAGE_SHIFT);
>  	} else {
>  		unsigned int domid =
>  			(xdata.flags & XENMEM_rsrc_acq_caller_owned) ?
> diff --git a/drivers/xen/xlate_mmu.c b/drivers/xen/xlate_mmu.c
> index ba883a80b3c0..7b1077f0abcb 100644
> --- a/drivers/xen/xlate_mmu.c
> +++ b/drivers/xen/xlate_mmu.c
> @@ -262,3 +262,35 @@ int __init xen_xlate_map_ballooned_pages(xen_pfn_t **gfns, void **virt,
>  	return 0;
>  }
>  EXPORT_SYMBOL_GPL(xen_xlate_map_ballooned_pages);
> +
> +struct remap_pfn {
> +	struct mm_struct *mm;
> +	struct page **pages;
> +	pgprot_t prot;
> +	unsigned long i;
> +};
> +
> +static int remap_pfn_fn(pte_t *ptep, 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;
> +}
> +
> +/* Used by the privcmd module, but has to be built-in on ARM */
> +int xen_remap_vma_range(struct vm_area_struct *vma, unsigned long addr, unsigned long len)
> +{
> +	struct remap_pfn r = {
> +		.mm = vma->vm_mm,
> +		.pages = vma->vm_private_data,
> +		.prot = vma->vm_page_prot,
> +	};
> +
> +	return apply_to_page_range(vma->vm_mm, addr, len, remap_pfn_fn, &r);
> +}
> +EXPORT_SYMBOL_GPL(xen_remap_vma_range);
> diff --git a/include/xen/xen-ops.h b/include/xen/xen-ops.h
> index 4969817124a8..98b30c1613b2 100644
> --- a/include/xen/xen-ops.h
> +++ b/include/xen/xen-ops.h
> @@ -109,6 +109,9 @@ static inline int xen_xlate_unmap_gfn_range(struct vm_area_struct *vma,
>  }
>  #endif
>  
> +int xen_remap_vma_range(struct vm_area_struct *vma, unsigned long addr,
> +			unsigned long len);
> +
>  /*
>   * xen_remap_domain_gfn_array() - map an array of foreign frames by gfn
>   * @vma:     VMA to map the pages into
> -- 
> 2.20.0
> 

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Xen-devel@lists.xenproject.org
https://lists.xenproject.org/mailman/listinfo/xen-devel
Re: [Xen-devel] [PATCH] [v3] xen: avoid link error on ARM
Posted by Juergen Gross 4 years, 8 months ago 
On 22.07.19 09:46, Arnd Bergmann wrote:
> Building the privcmd code as a loadable module on ARM, we get
> a link error due to the private cache management functions:
> 
> ERROR: "__sync_icache_dcache" [drivers/xen/xen-privcmd.ko] undefined!
> 
> Move the code into a new that is always built in when Xen is enabled,
> as suggested by Juergen Gross and Boris Ostrovsky.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Pushed to xen/tip.git for-linus-5.3a


Juergen

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