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[Qemu-devel] [PATCH 2/9] Allocate physical memory in low virtual address
From: |
Alexander Graf |
Subject: |
[Qemu-devel] [PATCH 2/9] Allocate physical memory in low virtual address space |
Date: |
Wed, 21 Oct 2009 21:16:54 +0200 |
KVM on S390x requires the virtual address space of the guest's RAM to be
within the first 256GB.
The general direction I'd like to see KVM on S390 move is that this requirement
is losened, but for now that's what we're stuck with.
So let's just hack up qemu_ram_alloc until KVM behaves nicely :-).
Signed-off-by: Alexander Graf <address@hidden>
---
exec.c | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/exec.c b/exec.c
index 076d26b..59150d0 100644
--- a/exec.c
+++ b/exec.c
@@ -2411,7 +2411,13 @@ ram_addr_t qemu_ram_alloc(ram_addr_t size)
size = TARGET_PAGE_ALIGN(size);
new_block = qemu_malloc(sizeof(*new_block));
+#if defined(TARGET_S390) && defined(CONFIG_KVM)
+ /* XXX S390 KVM requires the topmost vma of the RAM to be < 256GB */
+ new_block->host = mmap(0x1000000, size, PROT_EXEC|PROT_READ|PROT_WRITE,
+ MAP_SHARED | MAP_ANONYMOUS, -1, 0);
+#else
new_block->host = qemu_vmalloc(size);
+#endif
#ifdef MADV_MERGEABLE
madvise(new_block->host, size, MADV_MERGEABLE);
#endif
--
1.6.0.2
- [Qemu-devel] [PATCH 0/9] S390x KVM support v3, Alexander Graf, 2009/10/21
- [Qemu-devel] [PATCH 1/9] Add KVM support for S390x, Alexander Graf, 2009/10/21
- [Qemu-devel] [PATCH 2/9] Allocate physical memory in low virtual address space,
Alexander Graf <=
- [Qemu-devel] [PATCH 3/9] Add support for S390x system emulation, Alexander Graf, 2009/10/21
- [Qemu-devel] [PATCH 4/9] Add S390x virtio machine bus, Alexander Graf, 2009/10/21
- [Qemu-devel] [PATCH 5/9] Add S390x virtio machine description, Alexander Graf, 2009/10/21
- [Qemu-devel] [PATCH 6/9] S390 GDB stub, Alexander Graf, 2009/10/21
- [Qemu-devel] [PATCH 7/9] Implement early printk in virtio-console, Alexander Graf, 2009/10/21
- [Qemu-devel] [PATCH 8/9] Set default console to virtio on S390x, Alexander Graf, 2009/10/21
- [Qemu-devel] [PATCH 9/9] Move mp_state to CPU_COMMON, Alexander Graf, 2009/10/21
- Re: [Qemu-devel] [PATCH 9/9] Move mp_state to CPU_COMMON, Hollis Blanchard, 2009/10/29