[RFC PATCH v2 15/26] of/fdt: Introduce early_init_dt_add_memory_hyp()

From: Quentin Perret <qperret@google.com>
To: Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>, Marc Zyngier <maz@kernel.org>,
	James Morse <james.morse@arm.com>,
	Julien Thierry <julien.thierry.kdev@gmail.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Rob Herring <robh+dt@kernel.org>,
	Frank Rowand <frowand.list@gmail.com>
Cc: devicetree@vger.kernel.org, android-kvm@google.com,
	linux-kernel@vger.kernel.org, kernel-team@android.com,
	kvmarm@lists.cs.columbia.edu,
	linux-arm-kernel@lists.infradead.org,
	Fuad Tabba <tabba@google.com>,
	Mark Rutland <mark.rutland@arm.com>,
	David Brazdil <dbrazdil@google.com>
Subject: [RFC PATCH v2 15/26] of/fdt: Introduce early_init_dt_add_memory_hyp()
Date: Fri,  8 Jan 2021 12:15:13 +0000	[thread overview]
Message-ID: <20210108121524.656872-16-qperret@google.com> (raw)
In-Reply-To: <20210108121524.656872-1-qperret@google.com>

Introduce early_init_dt_add_memory_hyp() to allow KVM to conserve a copy
of the memory regions parsed from DT. This will be needed in the context
of the protected nVHE feature of KVM/arm64 where the code running at EL2
will be cleanly separated from the host kernel during boot, and will
need its own representation of memory.

Signed-off-by: Quentin Perret <qperret@google.com>
---
 drivers/of/fdt.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 4602e467ca8b..af2b5a09c5b4 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -1099,6 +1099,10 @@ int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
 #define MAX_MEMBLOCK_ADDR	((phys_addr_t)~0)
 #endif
 
+void __init __weak early_init_dt_add_memory_hyp(u64 base, u64 size)
+{
+}
+
 void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size)
 {
 	const u64 phys_offset = MIN_MEMBLOCK_ADDR;
@@ -1139,6 +1143,7 @@ void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size)
 		base = phys_offset;
 	}
 	memblock_add(base, size);
+	early_init_dt_add_memory_hyp(base, size);
 }
 
 int __init __weak early_init_dt_mark_hotplug_memory_arch(u64 base, u64 size)
-- 
2.30.0.284.gd98b1dd5eaa7-goog

