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[kvm-unit-tests,v2,15/23] arm64: Add a new type of memory type flag MR_F_RESERVED

Message ID 20220506205605.359830-16-nikos.nikoleris@arm.com (mailing list archive)
State New, archived
Headers show
Series EFI and ACPI support for arm64 | expand

Commit Message

Nikos Nikoleris May 6, 2022, 8:55 p.m. UTC 
From: Andrew Jones <drjones@redhat.com>

This will be used by future change to add PTE entries for special EFI
memory regions.

Signed-off-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
---
 lib/arm/asm/setup.h | 1 +
 lib/arm/mmu.c       | 4 ++++
 2 files changed, 5 insertions(+)

Comments

Ricardo Koller June 21, 2022, 4:44 p.m. UTC | #1 
On Fri, May 06, 2022 at 09:55:57PM +0100, Nikos Nikoleris wrote:
> From: Andrew Jones <drjones@redhat.com>
> 
> This will be used by future change to add PTE entries for special EFI
> memory regions.
> 
> Signed-off-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
> ---
>  lib/arm/asm/setup.h | 1 +
>  lib/arm/mmu.c       | 4 ++++
>  2 files changed, 5 insertions(+)
> 
> diff --git a/lib/arm/asm/setup.h b/lib/arm/asm/setup.h
> index f0e70b1..64cd379 100644
> --- a/lib/arm/asm/setup.h
> +++ b/lib/arm/asm/setup.h
> @@ -15,6 +15,7 @@ extern int nr_cpus;
>  
>  #define MR_F_IO			(1U << 0)
>  #define MR_F_CODE		(1U << 1)
> +#define MR_F_RESERVED		(1U << 2)
>  #define MR_F_UNKNOWN		(1U << 31)
>  
>  struct mem_region {
> diff --git a/lib/arm/mmu.c b/lib/arm/mmu.c
> index e1a72fe..931be98 100644
> --- a/lib/arm/mmu.c
> +++ b/lib/arm/mmu.c
> @@ -174,6 +174,10 @@ void *setup_mmu(phys_addr_t phys_end, void *unused)
>  	for (r = mem_regions; r->end; ++r) {
>  		if (r->flags & MR_F_IO) {
>  			continue;
> +		} else if (r->flags & MR_F_RESERVED) {
> +			/* Reserved pages need to be writable for whatever reserved them */
> +			mmu_set_range_ptes(mmu_idmap, r->start, r->start, r->end,
> +					   __pgprot(PTE_WBWA));
>  		} else if (r->flags & MR_F_CODE) {
>  			/* armv8 requires code shared between EL1 and EL0 to be read-only */
>  			mmu_set_range_ptes(mmu_idmap, r->start, r->start, r->end,
> -- 
> 2.25.1
>

Reviewed-by: Ricardo Koller <ricarkol@google.com>
diff mbox series

Patch

diff --git a/lib/arm/asm/setup.h b/lib/arm/asm/setup.h
index f0e70b1..64cd379 100644
--- a/lib/arm/asm/setup.h
+++ b/lib/arm/asm/setup.h
@@ -15,6 +15,7 @@  extern int nr_cpus;
 
 #define MR_F_IO			(1U << 0)
 #define MR_F_CODE		(1U << 1)
+#define MR_F_RESERVED		(1U << 2)
 #define MR_F_UNKNOWN		(1U << 31)
 
 struct mem_region {
diff --git a/lib/arm/mmu.c b/lib/arm/mmu.c
index e1a72fe..931be98 100644
--- a/lib/arm/mmu.c
+++ b/lib/arm/mmu.c
@@ -174,6 +174,10 @@  void *setup_mmu(phys_addr_t phys_end, void *unused)
 	for (r = mem_regions; r->end; ++r) {
 		if (r->flags & MR_F_IO) {
 			continue;
+		} else if (r->flags & MR_F_RESERVED) {
+			/* Reserved pages need to be writable for whatever reserved them */
+			mmu_set_range_ptes(mmu_idmap, r->start, r->start, r->end,
+					   __pgprot(PTE_WBWA));
 		} else if (r->flags & MR_F_CODE) {
 			/* armv8 requires code shared between EL1 and EL0 to be read-only */
 			mmu_set_range_ptes(mmu_idmap, r->start, r->start, r->end,