Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761543AbZCaAEZ (ORCPT ); Mon, 30 Mar 2009 20:04:25 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1760655AbZCaABi (ORCPT ); Mon, 30 Mar 2009 20:01:38 -0400 Received: from mx2.redhat.com ([66.187.237.31]:59804 "EHLO mx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760711AbZCaABg (ORCPT ); Mon, 30 Mar 2009 20:01:36 -0400 From: Izik Eidus Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-mm@kvack.org, avi@redhat.com, aarcange@redhat.com, chrisw@redhat.com, riel@redhat.com, jeremy@goop.org, mtosatti@redhat.com, hugh@veritas.com, corbet@lwn.net, yaniv@redhat.com, dmonakhov@openvz.org, Izik Eidus Subject: [PATCH 1/2] qemu: add ksm support Date: Tue, 31 Mar 2009 03:00:27 +0300 Message-Id: <1238457628-7668-2-git-send-email-ieidus@redhat.com> In-Reply-To: <1238457628-7668-1-git-send-email-ieidus@redhat.com> References: <1238457628-7668-1-git-send-email-ieidus@redhat.com> To: unlisted-recipients:; (no To-header on input) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3752 Lines: 150 Signed-off-by: Izik Eidus --- qemu/ksm.h | 70 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ qemu/vl.c | 34 +++++++++++++++++++++++++++++ 2 files changed, 104 insertions(+), 0 deletions(-) create mode 100644 qemu/ksm.h diff --git a/qemu/ksm.h b/qemu/ksm.h new file mode 100644 index 0000000..2fb91a8 --- /dev/null +++ b/qemu/ksm.h @@ -0,0 +1,70 @@ +#ifndef __LINUX_KSM_H +#define __LINUX_KSM_H + +/* + * Userspace interface for /dev/ksm - kvm shared memory + */ + + +#include +#include + +#include + +#define KSM_API_VERSION 1 + +#define ksm_control_flags_run 1 + +/* for KSM_REGISTER_MEMORY_REGION */ +struct ksm_memory_region { + __u32 npages; /* number of pages to share */ + __u32 pad; + __u64 addr; /* the begining of the virtual address */ + __u64 reserved_bits; +}; + +struct ksm_kthread_info { + __u32 sleep; /* number of microsecoends to sleep */ + __u32 pages_to_scan; /* number of pages to scan */ + __u32 flags; /* control flags */ + __u32 pad; + __u64 reserved_bits; +}; + +#define KSMIO 0xAB + +/* ioctls for /dev/ksm */ + +#define KSM_GET_API_VERSION _IO(KSMIO, 0x00) +/* + * KSM_CREATE_SHARED_MEMORY_AREA - create the shared memory reagion fd + */ +#define KSM_CREATE_SHARED_MEMORY_AREA _IO(KSMIO, 0x01) /* return SMA fd */ +/* + * KSM_START_STOP_KTHREAD - control the kernel thread scanning speed + * (can stop the kernel thread from working by setting running = 0) + */ +#define KSM_START_STOP_KTHREAD _IOW(KSMIO, 0x02,\ + struct ksm_kthread_info) +/* + * KSM_GET_INFO_KTHREAD - return information about the kernel thread + * scanning speed. + */ +#define KSM_GET_INFO_KTHREAD _IOW(KSMIO, 0x03,\ + struct ksm_kthread_info) + + +/* ioctls for SMA fds */ + +/* + * KSM_REGISTER_MEMORY_REGION - register virtual address memory area to be + * scanned by kvm. + */ +#define KSM_REGISTER_MEMORY_REGION _IOW(KSMIO, 0x20,\ + struct ksm_memory_region) +/* + * KSM_REMOVE_MEMORY_REGION - remove virtual address memory area from ksm. + */ +#define KSM_REMOVE_MEMORY_REGION _IO(KSMIO, 0x21) + +#endif diff --git a/qemu/vl.c b/qemu/vl.c index c52d2d7..54a9dd9 100644 --- a/qemu/vl.c +++ b/qemu/vl.c @@ -130,6 +130,7 @@ int main(int argc, char **argv) #define main qemu_main #endif /* CONFIG_COCOA */ +#include "ksm.h" #include "hw/hw.h" #include "hw/boards.h" #include "hw/usb.h" @@ -4873,6 +4874,37 @@ static void termsig_setup(void) #endif +static int ksm_register_memory(void) +{ + int fd; + int ksm_fd; + int r = 1; + struct ksm_memory_region ksm_region; + + fd = open("/dev/ksm", O_RDWR | O_TRUNC, (mode_t)0600); + if (fd == -1) + goto out; + + ksm_fd = ioctl(fd, KSM_CREATE_SHARED_MEMORY_AREA); + if (ksm_fd == -1) + goto out_free; + + ksm_region.npages = phys_ram_size / TARGET_PAGE_SIZE; + ksm_region.addr = (unsigned long)phys_ram_base; + r = ioctl(ksm_fd, KSM_REGISTER_MEMORY_REGION, &ksm_region); + if (r) + goto out_free1; + + return r; + +out_free1: + close(ksm_fd); +out_free: + close(fd); +out: + return r; +} + int main(int argc, char **argv, char **envp) { #ifdef CONFIG_GDBSTUB @@ -5862,6 +5894,8 @@ int main(int argc, char **argv, char **envp) /* init the dynamic translator */ cpu_exec_init_all(tb_size * 1024 * 1024); + ksm_register_memory(); + bdrv_init(); dma_helper_init(); -- 1.5.6.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/