This patch adds support for guest-side cleancache. This is the part which communicates
with the host regarding cleancache TMEM actions.
Signed-off-by: Sasha Levin <levinsasha928@xxxxxxxxx>
---
arch/x86/kvm/tmem/Kconfig | 9 +++
arch/x86/kvm/tmem/Makefile | 1 +
arch/x86/kvm/tmem/cleancache.c | 120 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 130 insertions(+), 0 deletions(-)
create mode 100644 arch/x86/kvm/tmem/cleancache.c
diff --git a/arch/x86/kvm/tmem/Kconfig b/arch/x86/kvm/tmem/Kconfig
index 85ec25b..4734db2 100644
--- a/arch/x86/kvm/tmem/Kconfig
+++ b/arch/x86/kvm/tmem/Kconfig
@@ -22,4 +22,13 @@ config KVM_TMEM_HOST
config KVM_TMEM_GUEST
bool
+config KVM_TMEM_GUEST_CLEANCACHE
+ bool "Guest-side cleancache support"
+ depends on CLEANCACHE
+ select KVM_TMEM_GUEST
+ ---help---
+ This options enables guest to use cleanswap with the KVM host acting
+ as the TMEM target, which means that cleanswap may be used across
+ VMs (and even hosts).
+
endif # KVM_TMEM
diff --git a/arch/x86/kvm/tmem/Makefile b/arch/x86/kvm/tmem/Makefile
index 1b15e20..b972c2b 100644
--- a/arch/x86/kvm/tmem/Makefile
+++ b/arch/x86/kvm/tmem/Makefile
@@ -2,3 +2,4 @@ ccflags-y += -Idrivers/staging/zcache/
obj-$(CONFIG_KVM_TMEM_HOST) += host.o
obj-$(CONFIG_KVM_TMEM_GUEST) += guest.o
+obj-$(CONFIG_KVM_TMEM_GUEST_CLEANCACHE) += cleancache.o
diff --git a/arch/x86/kvm/tmem/cleancache.c b/arch/x86/kvm/tmem/cleancache.c
new file mode 100644
index 0000000..97eee44
--- /dev/null
+++ b/arch/x86/kvm/tmem/cleancache.c
@@ -0,0 +1,120 @@
+/*
+ * KVM TMEM cleancache guest side interface
+ *
+ * Copyright (c) 2012 Sasha Levin
+ *
+ */
+
+#include <linux/cleancache.h>
+#include <linux/kvm_types.h>
+#include <linux/kvm_para.h>
+
+#include "tmem.h"
+#include "guest.h"
+
+#include <zcache.h>
+
+static void tmem_cleancache_put_page(int pool, struct cleancache_filekey key,
+ pgoff_t index, struct page *page)
+{
+ __u32 i = (__u32)index;
+ struct tmem_oid oid = *(struct tmem_oid *)&key;
+ unsigned long pfn = page_to_pfn(page);
+
+ if (pool < 0)
+ return;
+
+ kvm_tmem_put_page((__u32)pool, oid, i, pfn);
+}
+
+static int tmem_cleancache_get_page(int pool, struct cleancache_filekey key,
+ pgoff_t index, struct page *page)
+{
+ __u32 i = (__u32)index;
+ struct tmem_oid oid = *(struct tmem_oid *)&key;
+ unsigned long pfn = page_to_pfn(page);
+
+ if (pool < 0)
+ return -1;
+
+ return kvm_tmem_get_page((__u32)pool, oid, i, pfn);
+}
+
+static void tmem_cleancache_flush_page(int pool, struct cleancache_filekey key,
+ pgoff_t index)
+{
+ __u32 i = (__u32)index;
+ struct tmem_oid oid = *(struct tmem_oid *)&key;
+
+ if (pool < 0)
+ return;
+
+ kvm_tmem_flush_page((__u32)pool, oid, i);
+}
+
+static void tmem_cleancache_flush_inode(int pool, struct cleancache_filekey key)
+{
+ struct tmem_oid oid = *(struct tmem_oid *)&key;
+
+ if (pool < 0)
+ return;
+
+ kvm_tmem_flush_object((__u32)pool, oid);
+}
+
+static void tmem_cleancache_flush_fs(int pool)
+{
+ if (pool < 0)
+ return;
+
+ kvm_tmem_destroy_pool((__u32)pool);
+}
+
+static int tmem_cleancache_init_fs(size_t pagesize)
+{
+ return kvm_tmem_new_pool(KVM_CLIENT, 0, pagesize);
+}
+
+static int tmem_cleancache_init_shared_fs(char *uuid, size_t pagesize)
+{
+ return kvm_tmem_new_pool(KVM_CLIENT, TMEM_POOL_SHARED, pagesize);
+}
+
+static int use_kvmcleancache = 1;
+
+static int __init no_kvmcleancache(char *s)
+{
+ use_kvmcleancache = 0;
+ return 1;
+}
+
+__setup("nokvmcleancache", no_kvmcleancache);
+
+static struct cleancache_ops tmem_cleancache_ops = {
+ .put_page = tmem_cleancache_put_page,
+ .get_page = tmem_cleancache_get_page,
+ .invalidate_page = tmem_cleancache_flush_page,
+ .invalidate_inode = tmem_cleancache_flush_inode,
+ .invalidate_fs = tmem_cleancache_flush_fs,
+ .init_shared_fs = tmem_cleancache_init_shared_fs,
+ .init_fs = tmem_cleancache_init_fs
+};
+
+static int __init kvm_tmem_cleancache_init(void)
+{
+ struct cleancache_ops old_ops;
+
+ BUG_ON(sizeof(struct cleancache_filekey) != sizeof(struct tmem_oid));
+
+ if (!use_kvmcleancache || !kvm_para_available())
+ return 0;
+
+ old_ops = cleancache_register_ops(&tmem_cleancache_ops);
+
+ printk(KERN_INFO "cleancache enabled, RAM provided by KVM TMEM %s\n",
+ old_ops.init_fs?" (WARNING: cleancache_ops overridden)":"");
+
+ return 0;
+}
+
+module_init(kvm_tmem_cleancache_init)
--
1.7.8.6
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