1 files changed, 0 insertions, 184 deletions

diff --git a/patches/boot_time_opt/0152-x86-kvm-Notify-host-to-release-pages.patch b/patches/boot_time_opt/0152-x86-kvm-Notify-host-to-release-pages.patch
deleted file mode 100644
index d3a1553..0000000
--- a/patches/boot_time_opt/0152-x86-kvm-Notify-host-to-release-pages.patch
+++ /dev/null
@@ -1,184 +0,0 @@
-From 771ee703122aa119bb662208066040f8b9356986 Mon Sep 17 00:00:00 2001
-From: Sebastien Boeuf <sebastien.boeuf@intel.com>
-Date: Mon, 23 Jan 2017 15:08:55 -0800
-Subject: [PATCH 152/154] x86: kvm: Notify host to release pages
-
-In context of hypervisors managing several virtual machines, we
-want those virtual machines to give the memory they used back to
-the host when they don't need it anymore.
-
-This patch introduces a new hypercall KVM_HC_RETURN_MEM, allowing
-the guest kernel to notify the host kernel when such event occurs.
-And relying on do_madvise() function that we have previously exported,
-it issues a call to this function when it receives the new hypercall.
-
-Use of do_madvise() with MADV_DONTNEED flag will allow the guest to
-ask for a new page without going through a new hypercall. Instead,
-it will be able to start using that memory again as it will get
-faulted back in as a fresh new page. That's why do_madvise() is more
-efficient than doing vm_unmap() to return some memory to the host.
-
-This patch introduces also a new sysctl kvm_madv_instant_free,
-allowing user to set MADV_FREE advice instead of MADV_DONTNEED.
-Indeed, MADV_FREE saves more performances than using MADV_DONTNEED
-because it does not zero the pages in case the memory has not been
-freed by the kernel. This can happen when there was no need for the
-kernel to get this memory back, meaning it was keeping those pages
-in the right state to be re-used by the same application.
-MADV_FREE being a very recent advice introduced in kernel 4.5, we
-only want to enable it through a sysctl in case the user want to
-use it.
-
-Suggested-by: Arjan van de Ven <arjan.van.de.ven@intel.com>
-Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
-
-Modified for aufs4 enabled kernel
-Signed-off-by: Martin Borg <martin.borg@enea.com>
----
- arch/x86/kvm/x86.c            | 17 +++++++++++++++++
- include/linux/mm.h            |  5 +++++
- include/uapi/linux/kvm_para.h |  3 +++
- kernel/sysctl.c               |  7 +++++++
- mm/Makefile                   |  2 +-
- mm/kvm.c                      | 26 ++++++++++++++++++++++++++
- 6 files changed, 59 insertions(+), 1 deletion(-)
- create mode 100644 mm/kvm.c
-
-diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
-index 03869eb7fcd6..628bad46b8ad 100644
---- a/arch/x86/kvm/x86.c
-+++ b/arch/x86/kvm/x86.c
-@@ -45,6 +45,7 @@
- #include <linux/user-return-notifier.h>
- #include <linux/srcu.h>
- #include <linux/slab.h>
-+#include <linux/mm.h>
- #include <linux/perf_event.h>
- #include <linux/uaccess.h>
- #include <linux/hash.h>
-@@ -6253,6 +6254,19 @@ static void kvm_pv_kick_cpu_op(struct kvm *kvm, unsigned long flags, int apicid)
-        kvm_irq_delivery_to_apic(kvm, NULL, &lapic_irq, NULL);
- }
- 
-+static int kvm_pv_return_mem_op(struct kvm *kvm, gpa_t gpa, size_t len)
-+{
-+       unsigned long start = gfn_to_hva(kvm, gpa_to_gfn(gpa));
-+
-+       if (len > KVM_MAX_RET_MEM_SIZE)
-+               return KVM_EPERM;
-+
-+       if (kvm_is_error_hva(start + len))
-+               return KVM_EFAULT;
-+
-+       return do_madvise(start, len, kvm_ret_mem_advice);
-+}
-+
- void kvm_vcpu_deactivate_apicv(struct kvm_vcpu *vcpu)
- {
-        vcpu->arch.apicv_active = false;
-@@ -6304,6 +6318,9 @@ int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
-                ret = kvm_pv_clock_pairing(vcpu, a0, a1);
-                break;
- #endif
-+       case KVM_HC_RETURN_MEM:
-+               ret = kvm_pv_return_mem_op(vcpu->kvm, a0, a1);
-+               break;
-        default:
-                ret = -KVM_ENOSYS;
-                break;
-diff --git a/include/linux/mm.h b/include/linux/mm.h
-index c3153e9ee7ea..15e02bf3a6b3 100644
---- a/include/linux/mm.h
-+++ b/include/linux/mm.h
-@@ -2452,6 +2452,11 @@ extern bool process_shares_mm(struct task_struct *p, struct mm_struct *mm);
- extern int sysctl_drop_caches;
- int drop_caches_sysctl_handler(struct ctl_table *, int,
-                                        void __user *, size_t *, loff_t *);
-+extern int sysctl_kvm_madv_instant_free;
-+extern int kvm_ret_mem_advice;
-+int kvm_madv_instant_free_sysctl_handler(struct ctl_table *table, int write,
-+                                        void __user *buffer, size_t *length,
-+                                        loff_t *ppos);
- #endif
- 
- void drop_slab(void);
-diff --git a/include/uapi/linux/kvm_para.h b/include/uapi/linux/kvm_para.h
-index dcf629dd2889..85f9422fe59c 100644
---- a/include/uapi/linux/kvm_para.h
-+++ b/include/uapi/linux/kvm_para.h
-@@ -26,6 +26,9 @@
- #define KVM_HC_MIPS_EXIT_VM            7
- #define KVM_HC_MIPS_CONSOLE_OUTPUT     8
- #define KVM_HC_CLOCK_PAIRING           9
-+#define KVM_HC_RETURN_MEM              10
-+
-+#define KVM_MAX_RET_MEM_SIZE           (1 << 22) // 4MiB
- 
- /*
-  * hypercalls use architecture specific
-diff --git a/kernel/sysctl.c b/kernel/sysctl.c
-index d9c31bc2eaea..9a1611f92a2a 100644
---- a/kernel/sysctl.c
-+++ b/kernel/sysctl.c
-@@ -1410,6 +1410,13 @@ static struct ctl_table vm_table[] = {
-                .extra1         = &one,
-                .extra2         = &four,
-        },
-+       {
-+               .procname       = "kvm_madv_instant_free",
-+               .data           = &sysctl_kvm_madv_instant_free,
-+               .maxlen         = sizeof(int),
-+               .mode           = 0644,
-+               .proc_handler   = kvm_madv_instant_free_sysctl_handler,
-+       },
- #ifdef CONFIG_COMPACTION
-        {
-                .procname       = "compact_memory",
-diff --git a/mm/Makefile b/mm/Makefile
-index 4659b93cba43..77b145de8a55 100644
---- a/mm/Makefile
-+++ b/mm/Makefile
-@@ -40,7 +40,7 @@ obj-y                 := filemap.o mempool.o oom_kill.o \
-                           mm_init.o mmu_context.o percpu.o slab_common.o \
-                           compaction.o vmacache.o swap_slots.o \
-                           interval_tree.o list_lru.o workingset.o \
--                          prfile.o debug.o $(mmu-y)
-+                          prfile.o debug.o kvm.o $(mmu-y)
- 
- obj-y += init-mm.o
- 
-diff --git a/mm/kvm.c b/mm/kvm.c
-new file mode 100644
-index 000000000000..1c5600788221
---- /dev/null
-+++ b/mm/kvm.c
-@@ -0,0 +1,26 @@
-+#include <linux/mman.h>
-+#include <linux/sysctl.h>
-+
-+int sysctl_kvm_madv_instant_free;
-+
-+int kvm_ret_mem_advice = MADV_DONTNEED;
-+EXPORT_SYMBOL_GPL(kvm_ret_mem_advice);
-+
-+int kvm_madv_instant_free_sysctl_handler(struct ctl_table *table, int write,
-+       void __user *buffer, size_t *length, loff_t *ppos)
-+{
-+       int ret;
-+
-+       ret = proc_dointvec(table, write, buffer, length, ppos);
-+       if (ret)
-+               return ret;
-+
-+#ifdef MADV_FREE
-+       if (sysctl_kvm_madv_instant_free > 0)
-+               kvm_ret_mem_advice = MADV_FREE;
-+       else
-+               kvm_ret_mem_advice = MADV_DONTNEED;
-+#endif
-+
-+       return 0;
-+}
--- 
-2.15.0
-