From: Tom Rini <trini@konsulko.com>
To: u-boot@lists.denx.de
Subject: [PATCH v3 2/5] arm: qemu: enable LPAE on 32-bit
Date: Wed, 29 Jul 2020 09:43:44 -0400 [thread overview]
Message-ID: <20200729134344.GP6965@bill-the-cat> (raw)
In-Reply-To: <20200707100711.7446-3-ardb@kernel.org>
On Tue, Jul 07, 2020 at 12:07:08PM +0200, Ard Biesheuvel wrote:
> QEMU's mach-virt machine only supports selecting CPU models that
> implement the virtualization extensions, and are therefore guaranteed
> to support LPAE as well.
>
> Initially, QEMU would not allow emulating these CPUs running in HYP
> mode (or EL2, for AArch64), but today, it also contains a complete
> implementation of the virtualization extensions themselves.
>
> This means we could be running U-Boot in HYP mode, in which case the
> LPAE long descriptor page table format is the only format that is
> supported. If we are not running in HYP mode, we can use either.
>
> So let's enable CONFIG_ARMV7_LPAE for qemu_arm_defconfig so that we
> get the best support for running with the MMU and caches enabled at
> any privilege level.
>
> Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
> Acked-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Applied to u-boot/master, thanks!
--
Tom
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next prev parent reply other threads:[~2020-07-29 13:43 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-07 10:07 [PATCH v3 0/5] Fixes for running U-boot under QEMU/KVM Ard Biesheuvel
2020-07-07 10:07 ` [PATCH v3 1/5] arm: enable allocate-on-read for LPAE's DCACHE_WRITEBACK/_WRITETHROUGH Ard Biesheuvel
2020-07-07 12:03 ` André Przywara
2020-07-29 13:43 ` Tom Rini
2020-07-07 10:07 ` [PATCH v3 2/5] arm: qemu: enable LPAE on 32-bit Ard Biesheuvel
2020-07-29 13:43 ` Tom Rini [this message]
2020-07-07 10:07 ` [PATCH v3 3/5] arm: qemu: implement enable_caches() Ard Biesheuvel
2020-07-07 10:51 ` Heinrich Schuchardt
2020-07-07 12:58 ` André Przywara
2020-07-29 13:43 ` Tom Rini
2020-07-07 10:07 ` [PATCH v3 4/5] arm: qemu: disable the EFI workaround for older GRUB Ard Biesheuvel
2020-07-29 13:43 ` Tom Rini
2020-07-07 10:07 ` [PATCH v3 5/5] arm: qemu: override flash accessors to use virtualizable instructions Ard Biesheuvel
2020-07-07 14:26 ` André Przywara
2020-07-29 13:44 ` Tom Rini
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