* [PATCH QEMU] osdep: powerpc64 align memory to allow 2MB radix THP page tables
@ 2018-05-06 7:29 Nicholas Piggin
2018-06-06 1:06 ` David Gibson
0 siblings, 1 reply; 2+ messages in thread
From: Nicholas Piggin @ 2018-05-06 7:29 UTC (permalink / raw)
To: qemu-ppc
Cc: Nicholas Piggin, David Gibson, Alexander Graf, kvm-ppc, linuxppc-dev
This allows KVM with the Book3S radix MMU mode to take advantage of
THP and install larger pages in the partition scope page tables (the
host translation).
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
include/qemu/osdep.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h
index 41658060a7..5910682221 100644
--- a/include/qemu/osdep.h
+++ b/include/qemu/osdep.h
@@ -357,7 +357,8 @@ void qemu_anon_ram_free(void *ptr, size_t size);
#endif
#if defined(__linux__) && \
- (defined(__x86_64__) || defined(__arm__) || defined(__aarch64__))
+ (defined(__x86_64__) || defined(__arm__) || defined(__aarch64__) \
+ || defined(__powerpc64__))
/* Use 2 MiB alignment so transparent hugepages can be used by KVM.
Valgrind does not support alignments larger than 1 MiB,
therefore we need special code which handles running on Valgrind. */
--
2.17.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH QEMU] osdep: powerpc64 align memory to allow 2MB radix THP page tables
2018-05-06 7:29 [PATCH QEMU] osdep: powerpc64 align memory to allow 2MB radix THP page tables Nicholas Piggin
@ 2018-06-06 1:06 ` David Gibson
0 siblings, 0 replies; 2+ messages in thread
From: David Gibson @ 2018-06-06 1:06 UTC (permalink / raw)
To: Nicholas Piggin; +Cc: qemu-ppc, Alexander Graf, kvm-ppc, linuxppc-dev
[-- Attachment #1: Type: text/plain, Size: 1434 bytes --]
On Sun, May 06, 2018 at 05:29:49PM +1000, Nicholas Piggin wrote:
> This allows KVM with the Book3S radix MMU mode to take advantage of
> THP and install larger pages in the partition scope page tables (the
> host translation).
>
> Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
I've applied this to my ppc-for-3.0 tree. It's not strictly within
the code I maintain, but since it only affects ppc, it seems
reasonable to go through my tree.
> ---
> include/qemu/osdep.h | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h
> index 41658060a7..5910682221 100644
> --- a/include/qemu/osdep.h
> +++ b/include/qemu/osdep.h
> @@ -357,7 +357,8 @@ void qemu_anon_ram_free(void *ptr, size_t size);
> #endif
>
> #if defined(__linux__) && \
> - (defined(__x86_64__) || defined(__arm__) || defined(__aarch64__))
> + (defined(__x86_64__) || defined(__arm__) || defined(__aarch64__) \
> + || defined(__powerpc64__))
> /* Use 2 MiB alignment so transparent hugepages can be used by KVM.
> Valgrind does not support alignments larger than 1 MiB,
> therefore we need special code which handles running on Valgrind. */
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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