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[v4,59/61] arm64: defconfig: Enable LPA2 support

Message ID 20230912141549.278777-122-ardb@google.com (mailing list archive)
State New, archived
Headers show
Series arm64: Add support for LPA2 at stage1 and WXN | expand

Commit Message

Ard Biesheuvel Sept. 12, 2023, 2:16 p.m. UTC 
From: Ard Biesheuvel <ardb@kernel.org>

We typically enable support in defconfig for all architectural features
for which we can detect at runtime if the hardware actually supports
them.

Now that we have implemented support for LPA2 based 52-bit virtual
addressing in a way that should not impact 48-bit operation on non-LPA2
CPU, we can do the same, and enable 52-bit virtual addressing by
default.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
 arch/arm64/configs/defconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Catalin Marinas Oct. 19, 2023, 6:12 p.m. UTC | #1 
On Tue, Sep 12, 2023 at 02:16:49PM +0000, Ard Biesheuvel wrote:
> diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
> index 5315789f4868..214db88934b8 100644
> --- a/arch/arm64/configs/defconfig
> +++ b/arch/arm64/configs/defconfig
> @@ -73,7 +73,7 @@ CONFIG_ARCH_VEXPRESS=y
>  CONFIG_ARCH_VISCONTI=y
>  CONFIG_ARCH_XGENE=y
>  CONFIG_ARCH_ZYNQMP=y
> -CONFIG_ARM64_VA_BITS_48=y
> +CONFIG_ARM64_VA_BITS_52=y

More of a nitpick but I wonder whether we should drop the VA_BITS
entirely from defconfig and just change the default in Kconfig. Kconfig
currently defaults to 39-bit for 4K pages which is overridden by
defconfig.
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Patch

diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
index 5315789f4868..214db88934b8 100644
--- a/arch/arm64/configs/defconfig
+++ b/arch/arm64/configs/defconfig
@@ -73,7 +73,7 @@  CONFIG_ARCH_VEXPRESS=y
 CONFIG_ARCH_VISCONTI=y
 CONFIG_ARCH_XGENE=y
 CONFIG_ARCH_ZYNQMP=y
-CONFIG_ARM64_VA_BITS_48=y
+CONFIG_ARM64_VA_BITS_52=y
 CONFIG_SCHED_MC=y
 CONFIG_SCHED_SMT=y
 CONFIG_NUMA=y