On 2015/1/6 21:15, Andreas Herrmann wrote:
Two guest memory regions need to be defined and two "mem=" parameters
need to be passed to guest kernel to support more than 256 MB.
Signed-off-by: Andreas Herrmann <andreas.herrmann@xxxxxxxxxxxxxxxxxx>
---
tools/kvm/mips/include/kvm/kvm-arch.h | 10 +++++++++
tools/kvm/mips/kvm.c | 36 +++++++++++++++++++++++++++------
2 files changed, 40 insertions(+), 6 deletions(-)
diff --git a/tools/kvm/mips/include/kvm/kvm-arch.h b/tools/kvm/mips/include/kvm/kvm-arch.h
index 7eadbf4..97bbf34 100644
--- a/tools/kvm/mips/include/kvm/kvm-arch.h
+++ b/tools/kvm/mips/include/kvm/kvm-arch.h
@@ -1,10 +1,20 @@
#ifndef KVM__KVM_ARCH_H
#define KVM__KVM_ARCH_H
+
+/*
+ * Guest memory map is:
+ * 0x00000000-0x0fffffff : System RAM
+ * 0x10000000-0x1fffffff : I/O (defined by KVM_MMIO_START and KVM_MMIO_SIZE)
+ * 0x20000000- ... : System RAM
+ * See also kvm__init_ram().
+ */
+
#define KVM_MMIO_START 0x10000000
#define KVM_PCI_CFG_AREA KVM_MMIO_START
#define KVM_PCI_MMIO_AREA (KVM_MMIO_START + 0x1000000)
#define KVM_VIRTIO_MMIO_AREA (KVM_MMIO_START + 0x2000000)
+#define KVM_MMIO_SIZE 0x10000000
/*
* Just for reference. This and the above corresponds to what's used
diff --git a/tools/kvm/mips/kvm.c b/tools/kvm/mips/kvm.c
index fc0428b..10b441b 100644
--- a/tools/kvm/mips/kvm.c
+++ b/tools/kvm/mips/kvm.c
@@ -22,11 +22,28 @@ void kvm__init_ram(struct kvm *kvm)
u64 phys_start, phys_size;
void *host_mem;
- phys_start = 0;
- phys_size = kvm->ram_size;
- host_mem = kvm->ram_start;
+ if (kvm->ram_size <= KVM_MMIO_START) {
+ /* one region for all memory */
+ phys_start = 0;
+ phys_size = kvm->ram_size;
+ host_mem = kvm->ram_start;
- kvm__register_mem(kvm, phys_start, phys_size, host_mem);
+ kvm__register_mem(kvm, phys_start, phys_size, host_mem);
+ } else {
+ /* one region for memory that fits below MMIO range */
+ phys_start = 0;
+ phys_size = KVM_MMIO_SIZE;
Here phys_size = KVM_MMIO_START is better to make more sense.
+ host_mem = kvm->ram_start;
+
+ kvm__register_mem(kvm, phys_start, phys_size, host_mem);
+
+ /* one region for rest of memory */
+ phys_start = KVM_MMIO_START + KVM_MMIO_SIZE;
+ phys_size = kvm->ram_size - 0x10000000;
and, phys_size = kvm->ram_size - KVM_MMIO_START.
Tiejun
+ host_mem = kvm->ram_start + KVM_MMIO_SIZE;
+
+ kvm__register_mem(kvm, phys_start, phys_size, host_mem);
+ }
}
void kvm__arch_delete_ram(struct kvm *kvm)
@@ -108,8 +125,15 @@ static void kvm__mips_install_cmdline(struct kvm *kvm)
u64 argv_offset = argv_start;
u64 argc = 0;
- sprintf(p + cmdline_offset, "mem=0x%llx@0 ",
- (unsigned long long)kvm->ram_size);
+
+ if ((u64) kvm->ram_size <= KVM_MMIO_SIZE)
+ sprintf(p + cmdline_offset, "mem=0x%llx@0 ",
+ (unsigned long long)kvm->ram_size);
+ else
+ sprintf(p + cmdline_offset, "mem=0x%llx@0 mem=0x%llx@0x%llx ",
+ (unsigned long long)KVM_MMIO_START,
+ (unsigned long long)kvm->ram_size - KVM_MMIO_START,
+ (unsigned long long)(KVM_MMIO_START + KVM_MMIO_SIZE));
strcat(p + cmdline_offset, kvm->cfg.real_cmdline); /* maximum size is 2K */
