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Re: [Qemu-devel] [PATCH 05/11] Allocate physical memory in low virtual a
From: |
Aurelien Jarno |
Subject: |
Re: [Qemu-devel] [PATCH 05/11] Allocate physical memory in low virtual address space |
Date: |
Mon, 30 Nov 2009 19:18:43 +0100 |
User-agent: |
Mutt/1.5.20 (2009-06-14) |
On Thu, Nov 26, 2009 at 02:23:14PM +0100, Alexander Graf wrote:
> KVM on S390x requires the virtual address space of the guest's RAM to be
> within the first 256GB.
>
While I have no problem with this patch, I am curious to know the reason
of this. No need to change anything in the patch.
> 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
>
>
>
>
--
Aurelien Jarno GPG: 1024D/F1BCDB73
address@hidden http://www.aurel32.net
- Re: [Qemu-devel] [PATCH 06/11] Add support for S390x system emulation, (continued)
- [Qemu-devel] [PATCH 09/11] S390 GDB stub, Alexander Graf, 2009/11/26
- [Qemu-devel] [PATCH 03/11] S/390 fake TCG implementation, Alexander Graf, 2009/11/26
- [Qemu-devel] [PATCH 08/11] Add S390x virtio machine description, Alexander Graf, 2009/11/26
- [Qemu-devel] [PATCH 10/11] Set default console to virtio on S390x, Alexander Graf, 2009/11/26
- [Qemu-devel] [PATCH 05/11] Allocate physical memory in low virtual address space, Alexander Graf, 2009/11/26
- Re: [Qemu-devel] [PATCH 05/11] Allocate physical memory in low virtual address space,
Aurelien Jarno <=
- [Qemu-devel] [PATCH 02/11] S/390 host/target build system support, Alexander Graf, 2009/11/26
- Re: [Qemu-devel] [PATCH 00/11] S390x KVM support v4, Aurelien Jarno, 2009/11/30