linux-kernel - [kvmtool hack 3/3] kvmtool: arm64: Switch memory layout

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Message-Id: <20180109190414.4017-20-suzuki.poulose@arm.com>
Date:   Tue,  9 Jan 2018 19:04:14 +0000
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     kvm@...r.kernel.org, kvmarm@...ts.cs.columbia.edu,
        christoffer.dall@...aro.org, marc.zyngier@....com,
        linux-kernel@...r.kernel.org, kristina.martsenko@....com,
        peter.maydell@...aro.org, suzuki.poulose@....com,
        pbonzini@...hat.com, rkrcmar@...hat.com, will.deacon@....com,
        ard.biesheuvel@...aro.org, mark.rutland@....com,
        catalin.marinas@....com
Subject: [kvmtool hack 3/3] kvmtool: arm64: Switch memory layout

If the guest wants to use a larger physical address space place
the RAM at upper half of the address space. Otherwise, it uses the
default layout.

Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
---
 arm/aarch32/include/kvm/kvm-arch.h |  1 +
 arm/aarch64/include/kvm/kvm-arch.h | 15 ++++++++++++---
 arm/include/arm-common/kvm-arch.h  | 11 ++++++-----
 arm/kvm.c                          |  2 +-
 4 files changed, 20 insertions(+), 9 deletions(-)

diff --git a/arm/aarch32/include/kvm/kvm-arch.h b/arm/aarch32/include/kvm/kvm-arch.h
index cd31e72..2d62aab 100644
--- a/arm/aarch32/include/kvm/kvm-arch.h
+++ b/arm/aarch32/include/kvm/kvm-arch.h
@@ -4,6 +4,7 @@
 #define ARM_KERN_OFFSET(...)	0x8000
 
 #define ARM_MAX_MEMORY(...)	ARM_LOMAP_MAX_MEMORY
+#define ARM_MEMORY_AREA(...)	ARM32_MEMORY_AREA
 
 #include "arm-common/kvm-arch.h"
 
diff --git a/arm/aarch64/include/kvm/kvm-arch.h b/arm/aarch64/include/kvm/kvm-arch.h
index 9de623a..bad35b9 100644
--- a/arm/aarch64/include/kvm/kvm-arch.h
+++ b/arm/aarch64/include/kvm/kvm-arch.h
@@ -1,14 +1,23 @@
 #ifndef KVM__KVM_ARCH_H
 #define KVM__KVM_ARCH_H
 
+#include "arm-common/kvm-arch.h"
+
+#define ARM64_MEMORY_AREA(phys_shift)	(1UL << (phys_shift - 1))
+#define ARM64_MAX_MEMORY(phys_shift)	\
+	((1ULL << (phys_shift)) - ARM64_MEMORY_AREA(phys_shift))
+
+#define ARM_MEMORY_AREA(kvm)	((kvm)->cfg.arch.aarch32_guest ?	\
+				 ARM32_MEMORY_AREA		:	\
+				 ARM64_MEMORY_AREA(kvm->cfg.arch.phys_shift))
+
 #define ARM_KERN_OFFSET(kvm)	((kvm)->cfg.arch.aarch32_guest	?	\
 				0x8000				:	\
 				0x80000)
 
 #define ARM_MAX_MEMORY(kvm)	((kvm)->cfg.arch.aarch32_guest	?	\
-				ARM_LOMAP_MAX_MEMORY		:	\
-				ARM_HIMAP_MAX_MEMORY)
+				ARM32_MAX_MEMORY		:	\
+				ARM64_MAX_MEMORY(kvm->cfg.arch.phys_shift))
 
-#include "arm-common/kvm-arch.h"
 
 #endif /* KVM__KVM_ARCH_H */
diff --git a/arm/include/arm-common/kvm-arch.h b/arm/include/arm-common/kvm-arch.h
index c83c45f..ca7ab0f 100644
--- a/arm/include/arm-common/kvm-arch.h
+++ b/arm/include/arm-common/kvm-arch.h
@@ -6,14 +6,15 @@
 #include <linux/types.h>
 
 #include "arm-common/gic.h"
-
 #define ARM_IOPORT_AREA		_AC(0x0000000000000000, UL)
 #define ARM_MMIO_AREA		_AC(0x0000000000010000, UL)
 #define ARM_AXI_AREA		_AC(0x0000000040000000, UL)
-#define ARM_MEMORY_AREA		_AC(0x0000000080000000, UL)
 
-#define ARM_LOMAP_MAX_MEMORY	((1ULL << 32) - ARM_MEMORY_AREA)
-#define ARM_HIMAP_MAX_MEMORY	((1ULL << 40) - ARM_MEMORY_AREA)
+#define ARM32_MEMORY_AREA	_AC(0x0000000080000000, UL)
+#define ARM32_MAX_MEMORY	((1ULL << 32) - ARM32_MEMORY_AREA)
+
+#define ARM_IOMEM_AREA_END	ARM32_MEMORY_AREA
+
 
 #define ARM_GIC_DIST_BASE	(ARM_AXI_AREA - ARM_GIC_DIST_SIZE)
 #define ARM_GIC_CPUI_BASE	(ARM_GIC_DIST_BASE - ARM_GIC_CPUI_SIZE)
@@ -24,7 +25,7 @@
 #define ARM_IOPORT_SIZE		(ARM_MMIO_AREA - ARM_IOPORT_AREA)
 #define ARM_VIRTIO_MMIO_SIZE	(ARM_AXI_AREA - (ARM_MMIO_AREA + ARM_GIC_SIZE))
 #define ARM_PCI_CFG_SIZE	(1ULL << 24)
-#define ARM_PCI_MMIO_SIZE	(ARM_MEMORY_AREA - \
+#define ARM_PCI_MMIO_SIZE	(ARM_IOMEM_AREA_END - \
 				(ARM_AXI_AREA + ARM_PCI_CFG_SIZE))
 
 #define KVM_IOPORT_AREA		ARM_IOPORT_AREA
diff --git a/arm/kvm.c b/arm/kvm.c
index 7573391..0f155c6 100644
--- a/arm/kvm.c
+++ b/arm/kvm.c
@@ -38,7 +38,7 @@ void kvm__init_ram(struct kvm *kvm)
 	u64 phys_start, phys_size;
 	void *host_mem;
 
-	phys_start	= ARM_MEMORY_AREA;
+	phys_start	= ARM_MEMORY_AREA(kvm);
 	phys_size	= kvm->ram_size;
 	host_mem	= kvm->ram_start;
 
-- 
2.13.6