diff mbox

[3/7] ARM: KVM: move to a KVM provided HYP idmap

Message ID 1364909115-3810-4-git-send-email-marc.zyngier@arm.com (mailing list archive)
State New, archived
Headers show

Commit Message

Marc Zyngier April 2, 2013, 1:25 p.m. UTC 
After the HYP page table rework, it is pretty easy to let the KVM
code provide its own idmap, rather than expecting the kernel to
provide it. It takes actually less code to do so.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
---
 arch/arm/include/asm/idmap.h   |  1 -
 arch/arm/include/asm/kvm_mmu.h |  1 -
 arch/arm/kvm/mmu.c             | 24 +++++++++++++++++++++++-
 arch/arm/mm/idmap.c            | 31 +------------------------------
 4 files changed, 24 insertions(+), 33 deletions(-)

Comments

Will Deacon April 3, 2013, 9:43 a.m. UTC | #1 
On Tue, Apr 02, 2013 at 02:25:11PM +0100, Marc Zyngier wrote:
> After the HYP page table rework, it is pretty easy to let the KVM
> code provide its own idmap, rather than expecting the kernel to
> provide it. It takes actually less code to do so.
> 
> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
> ---
>  arch/arm/include/asm/idmap.h   |  1 -
>  arch/arm/include/asm/kvm_mmu.h |  1 -
>  arch/arm/kvm/mmu.c             | 24 +++++++++++++++++++++++-
>  arch/arm/mm/idmap.c            | 31 +------------------------------
>  4 files changed, 24 insertions(+), 33 deletions(-)

[...]

> diff --git a/arch/arm/mm/idmap.c b/arch/arm/mm/idmap.c
> index 5ee505c..9c467d0 100644
> --- a/arch/arm/mm/idmap.c
> +++ b/arch/arm/mm/idmap.c
> @@ -83,37 +83,10 @@ static void identity_mapping_add(pgd_t *pgd, const char *text_start,
>  	} while (pgd++, addr = next, addr != end);
>  }
>  
> -#if defined(CONFIG_ARM_VIRT_EXT) && defined(CONFIG_ARM_LPAE)
> -pgd_t *hyp_pgd;
> -
> -extern char  __hyp_idmap_text_start[], __hyp_idmap_text_end[];
> -
> -static int __init init_static_idmap_hyp(void)
> -{
> -	hyp_pgd = kzalloc(PTRS_PER_PGD * sizeof(pgd_t), GFP_KERNEL);
> -	if (!hyp_pgd)
> -		return -ENOMEM;
> -
> -	pr_info("Setting up static HYP identity map for 0x%p - 0x%p\n",
> -		__hyp_idmap_text_start, __hyp_idmap_text_end);
> -	identity_mapping_add(hyp_pgd, __hyp_idmap_text_start,
> -			     __hyp_idmap_text_end, PMD_SECT_AP1);
> -
> -	return 0;
> -}
> -#else
> -static int __init init_static_idmap_hyp(void)
> -{
> -	return 0;
> -}
> -#endif
> -
>  extern char  __idmap_text_start[], __idmap_text_end[];
>  
>  static int __init init_static_idmap(void)
>  {
> -	int ret;
> -
>  	idmap_pgd = pgd_alloc(&init_mm);
>  	if (!idmap_pgd)
>  		return -ENOMEM;
> @@ -123,12 +96,10 @@ static int __init init_static_idmap(void)
>  	identity_mapping_add(idmap_pgd, __idmap_text_start,
>  			     __idmap_text_end, 0);
>  
> -	ret = init_static_idmap_hyp();
> -
>  	/* Flush L1 for the hardware to see this page table content */
>  	flush_cache_louis();
>  
> -	return ret;
> +	return 0;
>  }
>  early_initcall(init_static_idmap);

You can probably kill off the #include <asm/virt.h> from this file too,
although I can't immediately see why it's needed anyway.

If that works out,

  Acked-by: Will Deacon <will.deacon@arm.com>

Will
Marc Zyngier April 3, 2013, 9:46 a.m. UTC | #2 
On 03/04/13 10:43, Will Deacon wrote:
> On Tue, Apr 02, 2013 at 02:25:11PM +0100, Marc Zyngier wrote:
>> After the HYP page table rework, it is pretty easy to let the KVM
>> code provide its own idmap, rather than expecting the kernel to
>> provide it. It takes actually less code to do so.
>>
>> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
>> ---
>>  arch/arm/include/asm/idmap.h   |  1 -
>>  arch/arm/include/asm/kvm_mmu.h |  1 -
>>  arch/arm/kvm/mmu.c             | 24 +++++++++++++++++++++++-
>>  arch/arm/mm/idmap.c            | 31 +------------------------------
>>  4 files changed, 24 insertions(+), 33 deletions(-)
> 
> [...]
> 
>> diff --git a/arch/arm/mm/idmap.c b/arch/arm/mm/idmap.c
>> index 5ee505c..9c467d0 100644
>> --- a/arch/arm/mm/idmap.c
>> +++ b/arch/arm/mm/idmap.c
>> @@ -83,37 +83,10 @@ static void identity_mapping_add(pgd_t *pgd, const char *text_start,
>>  	} while (pgd++, addr = next, addr != end);
>>  }
>>  
>> -#if defined(CONFIG_ARM_VIRT_EXT) && defined(CONFIG_ARM_LPAE)
>> -pgd_t *hyp_pgd;
>> -
>> -extern char  __hyp_idmap_text_start[], __hyp_idmap_text_end[];
>> -
>> -static int __init init_static_idmap_hyp(void)
>> -{
>> -	hyp_pgd = kzalloc(PTRS_PER_PGD * sizeof(pgd_t), GFP_KERNEL);
>> -	if (!hyp_pgd)
>> -		return -ENOMEM;
>> -
>> -	pr_info("Setting up static HYP identity map for 0x%p - 0x%p\n",
>> -		__hyp_idmap_text_start, __hyp_idmap_text_end);
>> -	identity_mapping_add(hyp_pgd, __hyp_idmap_text_start,
>> -			     __hyp_idmap_text_end, PMD_SECT_AP1);
>> -
>> -	return 0;
>> -}
>> -#else
>> -static int __init init_static_idmap_hyp(void)
>> -{
>> -	return 0;
>> -}
>> -#endif
>> -
>>  extern char  __idmap_text_start[], __idmap_text_end[];
>>  
>>  static int __init init_static_idmap(void)
>>  {
>> -	int ret;
>> -
>>  	idmap_pgd = pgd_alloc(&init_mm);
>>  	if (!idmap_pgd)
>>  		return -ENOMEM;
>> @@ -123,12 +96,10 @@ static int __init init_static_idmap(void)
>>  	identity_mapping_add(idmap_pgd, __idmap_text_start,
>>  			     __idmap_text_end, 0);
>>  
>> -	ret = init_static_idmap_hyp();
>> -
>>  	/* Flush L1 for the hardware to see this page table content */
>>  	flush_cache_louis();
>>  
>> -	return ret;
>> +	return 0;
>>  }
>>  early_initcall(init_static_idmap);
> 
> You can probably kill off the #include <asm/virt.h> from this file too,
> although I can't immediately see why it's needed anyway.

It should never have been there the first place! I'll get rid of it in v2.

> If that works out,
> 
>   Acked-by: Will Deacon <will.deacon@arm.com>

Thanks!

	M.
Christoffer Dall April 3, 2013, 11:14 p.m. UTC | #3 
On Tue, Apr 02, 2013 at 02:25:11PM +0100, Marc Zyngier wrote:
> After the HYP page table rework, it is pretty easy to let the KVM
> code provide its own idmap, rather than expecting the kernel to
> provide it. It takes actually less code to do so.
> 
> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
> ---
>  arch/arm/include/asm/idmap.h   |  1 -
>  arch/arm/include/asm/kvm_mmu.h |  1 -
>  arch/arm/kvm/mmu.c             | 24 +++++++++++++++++++++++-
>  arch/arm/mm/idmap.c            | 31 +------------------------------
>  4 files changed, 24 insertions(+), 33 deletions(-)
> 
> diff --git a/arch/arm/include/asm/idmap.h b/arch/arm/include/asm/idmap.h
> index 1a66f907..bf863ed 100644
> --- a/arch/arm/include/asm/idmap.h
> +++ b/arch/arm/include/asm/idmap.h
> @@ -8,7 +8,6 @@
>  #define __idmap __section(.idmap.text) noinline notrace
>  
>  extern pgd_t *idmap_pgd;
> -extern pgd_t *hyp_pgd;
>  
>  void setup_mm_for_reboot(void);
>  
> diff --git a/arch/arm/include/asm/kvm_mmu.h b/arch/arm/include/asm/kvm_mmu.h
> index 970f3b5..3c71a1d 100644
> --- a/arch/arm/include/asm/kvm_mmu.h
> +++ b/arch/arm/include/asm/kvm_mmu.h
> @@ -21,7 +21,6 @@
>  
>  #include <asm/cacheflush.h>
>  #include <asm/pgalloc.h>
> -#include <asm/idmap.h>
>  
>  /*
>   * We directly use the kernel VA for the HYP, as we can directly share
> diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
> index eb4f8fa..7d23480 100644
> --- a/arch/arm/kvm/mmu.c
> +++ b/arch/arm/kvm/mmu.c
> @@ -32,6 +32,7 @@
>  
>  extern char  __hyp_idmap_text_start[], __hyp_idmap_text_end[];
>  
> +static pgd_t *hyp_pgd;
>  static DEFINE_MUTEX(kvm_hyp_pgd_mutex);
>  
>  static void kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa)
> @@ -715,12 +716,33 @@ phys_addr_t kvm_mmu_get_httbr(void)
>  
>  int kvm_mmu_init(void)
>  {
> +	unsigned long hyp_idmap_start = virt_to_phys(__hyp_idmap_text_start);
> +	unsigned long hyp_idmap_end = virt_to_phys(__hyp_idmap_text_end);
> +	int err;
> +
> +	hyp_pgd = kzalloc(PTRS_PER_PGD * sizeof(pgd_t), GFP_KERNEL);
>  	if (!hyp_pgd) {
>  		kvm_err("Hyp mode PGD not allocated\n");
> -		return -ENOMEM;
> +		err = -ENOMEM;
> +		goto out;
> +	}
> +
> +	/* Create the idmap in the boot page tables */
> +	err = 	__create_hyp_mappings(boot_hyp_pgd,
> +				      hyp_idmap_start, hyp_idmap_end,
> +				      __phys_to_pfn(hyp_idmap_start),
> +				      PAGE_HYP);
> +
> +	if (err) {
> +		kvm_err("Failed to idmap %lx-%lx\n",
> +			hyp_idmap_start, hyp_idmap_end);
> +		goto out;
>  	}
>  
>  	return 0;
> +out:
> +	kfree(hyp_pgd);
> +	return err;
>  }
>  
>  /**
> diff --git a/arch/arm/mm/idmap.c b/arch/arm/mm/idmap.c
> index 5ee505c..9c467d0 100644
> --- a/arch/arm/mm/idmap.c
> +++ b/arch/arm/mm/idmap.c
> @@ -83,37 +83,10 @@ static void identity_mapping_add(pgd_t *pgd, const char *text_start,
>  	} while (pgd++, addr = next, addr != end);
>  }
>  
> -#if defined(CONFIG_ARM_VIRT_EXT) && defined(CONFIG_ARM_LPAE)
> -pgd_t *hyp_pgd;
> -
> -extern char  __hyp_idmap_text_start[], __hyp_idmap_text_end[];
> -
> -static int __init init_static_idmap_hyp(void)
> -{
> -	hyp_pgd = kzalloc(PTRS_PER_PGD * sizeof(pgd_t), GFP_KERNEL);
> -	if (!hyp_pgd)
> -		return -ENOMEM;
> -
> -	pr_info("Setting up static HYP identity map for 0x%p - 0x%p\n",
> -		__hyp_idmap_text_start, __hyp_idmap_text_end);
> -	identity_mapping_add(hyp_pgd, __hyp_idmap_text_start,
> -			     __hyp_idmap_text_end, PMD_SECT_AP1);
> -
> -	return 0;
> -}
> -#else
> -static int __init init_static_idmap_hyp(void)
> -{
> -	return 0;
> -}
> -#endif
> -
>  extern char  __idmap_text_start[], __idmap_text_end[];
>  
>  static int __init init_static_idmap(void)
>  {
> -	int ret;
> -
>  	idmap_pgd = pgd_alloc(&init_mm);
>  	if (!idmap_pgd)
>  		return -ENOMEM;
> @@ -123,12 +96,10 @@ static int __init init_static_idmap(void)
>  	identity_mapping_add(idmap_pgd, __idmap_text_start,
>  			     __idmap_text_end, 0);
>  
> -	ret = init_static_idmap_hyp();
> -
>  	/* Flush L1 for the hardware to see this page table content */
>  	flush_cache_louis();
>  
> -	return ret;
> +	return 0;
>  }
>  early_initcall(init_static_idmap);
>  
> -- 
> 1.8.1.4
> 
> 

Looks good to me, Russell, if you ack this one, I can send this through
the KVM tree, otherwise let me know if you want it through your tree.

-Christoffer
diff mbox

Patch

diff --git a/arch/arm/include/asm/idmap.h b/arch/arm/include/asm/idmap.h
index 1a66f907..bf863ed 100644
--- a/arch/arm/include/asm/idmap.h
+++ b/arch/arm/include/asm/idmap.h
@@ -8,7 +8,6 @@ 
 #define __idmap __section(.idmap.text) noinline notrace
 
 extern pgd_t *idmap_pgd;
-extern pgd_t *hyp_pgd;
 
 void setup_mm_for_reboot(void);
 
diff --git a/arch/arm/include/asm/kvm_mmu.h b/arch/arm/include/asm/kvm_mmu.h
index 970f3b5..3c71a1d 100644
--- a/arch/arm/include/asm/kvm_mmu.h
+++ b/arch/arm/include/asm/kvm_mmu.h
@@ -21,7 +21,6 @@ 
 
 #include <asm/cacheflush.h>
 #include <asm/pgalloc.h>
-#include <asm/idmap.h>
 
 /*
  * We directly use the kernel VA for the HYP, as we can directly share
diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
index eb4f8fa..7d23480 100644
--- a/arch/arm/kvm/mmu.c
+++ b/arch/arm/kvm/mmu.c
@@ -32,6 +32,7 @@ 
 
 extern char  __hyp_idmap_text_start[], __hyp_idmap_text_end[];
 
+static pgd_t *hyp_pgd;
 static DEFINE_MUTEX(kvm_hyp_pgd_mutex);
 
 static void kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa)
@@ -715,12 +716,33 @@  phys_addr_t kvm_mmu_get_httbr(void)
 
 int kvm_mmu_init(void)
 {
+	unsigned long hyp_idmap_start = virt_to_phys(__hyp_idmap_text_start);
+	unsigned long hyp_idmap_end = virt_to_phys(__hyp_idmap_text_end);
+	int err;
+
+	hyp_pgd = kzalloc(PTRS_PER_PGD * sizeof(pgd_t), GFP_KERNEL);
 	if (!hyp_pgd) {
 		kvm_err("Hyp mode PGD not allocated\n");
-		return -ENOMEM;
+		err = -ENOMEM;
+		goto out;
+	}
+
+	/* Create the idmap in the boot page tables */
+	err = 	__create_hyp_mappings(boot_hyp_pgd,
+				      hyp_idmap_start, hyp_idmap_end,
+				      __phys_to_pfn(hyp_idmap_start),
+				      PAGE_HYP);
+
+	if (err) {
+		kvm_err("Failed to idmap %lx-%lx\n",
+			hyp_idmap_start, hyp_idmap_end);
+		goto out;
 	}
 
 	return 0;
+out:
+	kfree(hyp_pgd);
+	return err;
 }
 
 /**
diff --git a/arch/arm/mm/idmap.c b/arch/arm/mm/idmap.c
index 5ee505c..9c467d0 100644
--- a/arch/arm/mm/idmap.c
+++ b/arch/arm/mm/idmap.c
@@ -83,37 +83,10 @@  static void identity_mapping_add(pgd_t *pgd, const char *text_start,
 	} while (pgd++, addr = next, addr != end);
 }
 
-#if defined(CONFIG_ARM_VIRT_EXT) && defined(CONFIG_ARM_LPAE)
-pgd_t *hyp_pgd;
-
-extern char  __hyp_idmap_text_start[], __hyp_idmap_text_end[];
-
-static int __init init_static_idmap_hyp(void)
-{
-	hyp_pgd = kzalloc(PTRS_PER_PGD * sizeof(pgd_t), GFP_KERNEL);
-	if (!hyp_pgd)
-		return -ENOMEM;
-
-	pr_info("Setting up static HYP identity map for 0x%p - 0x%p\n",
-		__hyp_idmap_text_start, __hyp_idmap_text_end);
-	identity_mapping_add(hyp_pgd, __hyp_idmap_text_start,
-			     __hyp_idmap_text_end, PMD_SECT_AP1);
-
-	return 0;
-}
-#else
-static int __init init_static_idmap_hyp(void)
-{
-	return 0;
-}
-#endif
-
 extern char  __idmap_text_start[], __idmap_text_end[];
 
 static int __init init_static_idmap(void)
 {
-	int ret;
-
 	idmap_pgd = pgd_alloc(&init_mm);
 	if (!idmap_pgd)
 		return -ENOMEM;
@@ -123,12 +96,10 @@  static int __init init_static_idmap(void)
 	identity_mapping_add(idmap_pgd, __idmap_text_start,
 			     __idmap_text_end, 0);
 
-	ret = init_static_idmap_hyp();
-
 	/* Flush L1 for the hardware to see this page table content */
 	flush_cache_louis();
 
-	return ret;
+	return 0;
 }
 early_initcall(init_static_idmap);