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[PATCH V3 2/3] arm64: support initrd outside kernel linear map

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  [PATCH V3 2/3] arm64: support initrd outside kernel linear map Mark Salter <msalter@redhat.com> - 2015-08-16 23:00 +0200
    Re: [PATCH V3 2/3] arm64: support initrd outside kernel linear map Will Deacon <will.deacon@arm.com> - 2015-08-17 13:30 +0200
      Re: [PATCH V3 2/3] arm64: support initrd outside kernel linear map Mark Salter <msalter@redhat.com> - 2015-08-17 15:40 +0200

#1208272 — [PATCH V3 2/3] arm64: support initrd outside kernel linear map

The use of mem= could leave part or all of the initrd outside of
the kernel linear map. This will lead to an error when unpacking
the initrd and a probable failure to boot. This patch catches that
situation and relocates the initrd to be fully within the linear
map.

Signed-off-by: Mark Salter <msalter@redhat.com>
---
 arch/arm64/kernel/setup.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)

diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index f3067d4..5f45fd9 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -359,6 +359,64 @@ static void __init request_standard_resources(void)
 	}
 }
 
+#ifdef CONFIG_BLK_DEV_INITRD
+/*
+ * Relocate initrd if it is not completely within the linear mapping.
+ * This would be the case if mem= cuts out all or part of it.
+ */
+static void __init relocate_initrd(void)
+{
+	phys_addr_t orig_start = __virt_to_phys(initrd_start);
+	phys_addr_t orig_end = __virt_to_phys(initrd_end);
+	phys_addr_t ram_end = memblock_end_of_DRAM();
+	phys_addr_t new_start;
+	unsigned long size, to_free = 0;
+	void *dest;
+
+	if (orig_end <= ram_end)
+		return;
+
+	/* Note if any of original initrd will freeing below */
+	if (orig_start < ram_end)
+		to_free = ram_end - orig_start;
+
+	size = orig_end - orig_start;
+
+	/* initrd needs to be relocated completely inside linear mapping */
+	new_start = memblock_find_in_range(0, PFN_PHYS(max_pfn),
+					   size, PAGE_SIZE);
+	if (!new_start)
+		panic("Cannot relocate initrd of size %ld\n", size);
+	memblock_reserve(new_start, size);
+
+	initrd_start = __phys_to_virt(new_start);
+	initrd_end   = initrd_start + size;
+
+	pr_info("Moving initrd from [%llx-%llx] to [%llx-%llx]\n",
+		orig_start, orig_start + size - 1,
+		new_start, new_start + size - 1);
+
+	dest = (void *)initrd_start;
+
+	if (to_free) {
+		memcpy(dest, (void *)__phys_to_virt(orig_start), to_free);
+		dest += to_free;
+	}
+
+	copy_from_early_mem(dest, orig_start + to_free, size - to_free);
+
+	if (to_free) {
+		pr_info("Freeing original RAMDISK from [%llx-%llx]\n",
+			orig_start, orig_start + to_free - 1);
+		memblock_free(orig_start, to_free);
+	}
+}
+#else
+static inline void __init reserve_initrd(void)
+{
+}
+#endif
+
 u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID };
 
 void __init setup_arch(char **cmdline_p)
@@ -392,6 +450,7 @@ void __init setup_arch(char **cmdline_p)
 	acpi_boot_table_init();
 
 	paging_init();
+	relocate_initrd();
 	request_standard_resources();
 
 	early_ioremap_reset();
-- 
2.4.3

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#1208537

Hi Mark,

On Sun, Aug 16, 2015 at 09:49:27PM +0100, Mark Salter wrote:
> The use of mem= could leave part or all of the initrd outside of
> the kernel linear map. This will lead to an error when unpacking
> the initrd and a probable failure to boot. This patch catches that
> situation and relocates the initrd to be fully within the linear
> map.
> 
> Signed-off-by: Mark Salter <msalter@redhat.com>
> ---
>  arch/arm64/kernel/setup.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 59 insertions(+)
> 
> diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
> index f3067d4..5f45fd9 100644
> --- a/arch/arm64/kernel/setup.c
> +++ b/arch/arm64/kernel/setup.c
> @@ -359,6 +359,64 @@ static void __init request_standard_resources(void)
>  	}
>  }
>  
> +#ifdef CONFIG_BLK_DEV_INITRD
> +/*
> + * Relocate initrd if it is not completely within the linear mapping.
> + * This would be the case if mem= cuts out all or part of it.
> + */
> +static void __init relocate_initrd(void)
> +{
> +	phys_addr_t orig_start = __virt_to_phys(initrd_start);
> +	phys_addr_t orig_end = __virt_to_phys(initrd_end);

Any particular reason to use the __* variants here?

> +	phys_addr_t ram_end = memblock_end_of_DRAM();
> +	phys_addr_t new_start;
> +	unsigned long size, to_free = 0;
> +	void *dest;
> +
> +	if (orig_end <= ram_end)
> +		return;
> +
> +	/* Note if any of original initrd will freeing below */

The comment doesn't make sense.

> +	if (orig_start < ram_end)
> +		to_free = ram_end - orig_start;
> +
> +	size = orig_end - orig_start;
> +
> +	/* initrd needs to be relocated completely inside linear mapping */
> +	new_start = memblock_find_in_range(0, PFN_PHYS(max_pfn),
> +					   size, PAGE_SIZE);
> +	if (!new_start)
> +		panic("Cannot relocate initrd of size %ld\n", size);
> +	memblock_reserve(new_start, size);
> +
> +	initrd_start = __phys_to_virt(new_start);
> +	initrd_end   = initrd_start + size;
> +
> +	pr_info("Moving initrd from [%llx-%llx] to [%llx-%llx]\n",
> +		orig_start, orig_start + size - 1,
> +		new_start, new_start + size - 1);
> +
> +	dest = (void *)initrd_start;
> +
> +	if (to_free) {
> +		memcpy(dest, (void *)__phys_to_virt(orig_start), to_free);
> +		dest += to_free;
> +	}
> +
> +	copy_from_early_mem(dest, orig_start + to_free, size - to_free);
> +
> +	if (to_free) {
> +		pr_info("Freeing original RAMDISK from [%llx-%llx]\n",
> +			orig_start, orig_start + to_free - 1);
> +		memblock_free(orig_start, to_free);
> +	}
> +}
> +#else
> +static inline void __init reserve_initrd(void)

relocate_initrd ?

Will
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#1208596

On Mon, 2015-08-17 at 12:22 +0100, Will Deacon wrote:
> Hi Mark,
> 
> On Sun, Aug 16, 2015 at 09:49:27PM +0100, Mark Salter wrote:
> > The use of mem= could leave part or all of the initrd outside of
> > the kernel linear map. This will lead to an error when unpacking
> > the initrd and a probable failure to boot. This patch catches that
> > situation and relocates the initrd to be fully within the linear
> > map.
> > 
> > Signed-off-by: Mark Salter <msalter@redhat.com>
> > ---
> >  arch/arm64/kernel/setup.c | 59 
> > +++++++++++++++++++++++++++++++++++++++++++++++
> >  1 file changed, 59 insertions(+)
> > 
> > diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
> > index f3067d4..5f45fd9 100644
> > --- a/arch/arm64/kernel/setup.c
> > +++ b/arch/arm64/kernel/setup.c
> > @@ -359,6 +359,64 @@ static void __init 
> > request_standard_resources(void)
> >  	}
> >  }
> >  
> > +#ifdef CONFIG_BLK_DEV_INITRD
> > +/*
> > + * Relocate initrd if it is not completely within the linear mapping.
> > + * This would be the case if mem= cuts out all or part of it.
> > + */
> > +static void __init relocate_initrd(void)
> > +{
> > +	phys_addr_t orig_start = __virt_to_phys(initrd_start);
> > +	phys_addr_t orig_end = __virt_to_phys(initrd_end);
> 
> Any particular reason to use the __* variants here?

To avoid need to cast initrd_{start,end} to pointer.

> 
> > +	phys_addr_t ram_end = memblock_end_of_DRAM();
> > +	phys_addr_t new_start;
> > +	unsigned long size, to_free = 0;
> > +	void *dest;
> > +
> > +	if (orig_end <= ram_end)
> > +		return;
> > +
> > +	/* Note if any of original initrd will freeing below */
> 
> The comment doesn't make sense.

No it doesn't.

> 
> > +	if (orig_start < ram_end)
> > +		to_free = ram_end - orig_start;
> > +
> > +	size = orig_end - orig_start;
> > +
> > +	/* initrd needs to be relocated completely inside linear 
> > mapping */
> > +	new_start = memblock_find_in_range(0, PFN_PHYS(max_pfn),
> > +					   size, PAGE_SIZE);
> > +	if (!new_start)
> > +		panic("Cannot relocate initrd of size %ld\n", size);
> > +	memblock_reserve(new_start, size);
> > +
> > +	initrd_start = __phys_to_virt(new_start);
> > +	initrd_end   = initrd_start + size;
> > +
> > +	pr_info("Moving initrd from [%llx-%llx] to [%llx-%llx]\n",
> > +		orig_start, orig_start + size - 1,
> > +		new_start, new_start + size - 1);
> > +
> > +	dest = (void *)initrd_start;
> > +
> > +	if (to_free) {
> > +		memcpy(dest, (void *)__phys_to_virt(orig_start), 
> > to_free);
> > +		dest += to_free;
> > +	}
> > +
> > +	copy_from_early_mem(dest, orig_start + to_free, size - 
> > to_free);
> > +
> > +	if (to_free) {
> > +		pr_info("Freeing original RAMDISK from [%llx-%llx]\n",
> > +			orig_start, orig_start + to_free - 1);
> > +		memblock_free(orig_start, to_free);
> > +	}
> > +}
> > +#else
> > +static inline void __init reserve_initrd(void)
> 
> relocate_initrd ?

Yes

Thanks, will fix that and the comment.


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