From: Nitesh Narayan Lal <nitesh@redhat.com>
To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
pbonzini@redhat.com, lcapitulino@redhat.com, pagupta@redhat.com,
wei.w.wang@intel.com, yang.zhang.wz@gmail.com, riel@surriel.com,
david@redhat.com, mst@redhat.com, dodgen@google.com,
konrad.wilk@oracle.com, dhildenb@redhat.com, aarcange@redhat.com
Subject: [RFC][Patch v8 1/7] KVM: Support for guest free page hinting
Date: Mon, 4 Feb 2019 15:18:48 -0500 [thread overview]
Message-ID: <20190204201854.2328-2-nitesh@redhat.com> (raw)
In-Reply-To: <20190204201854.2328-1-nitesh@redhat.com>
This patch includes the following:
1. Basic skeleton for the support
2. Enablement of x86 platform to use the same
Signed-off-by: Nitesh Narayan Lal <nitesh@redhat.com>
---
arch/x86/Kbuild | 2 +-
arch/x86/kvm/Kconfig | 8 ++++++++
arch/x86/kvm/Makefile | 2 ++
include/linux/gfp.h | 9 +++++++++
include/linux/page_hinting.h | 17 +++++++++++++++++
virt/kvm/page_hinting.c | 36 ++++++++++++++++++++++++++++++++++++
6 files changed, 73 insertions(+), 1 deletion(-)
create mode 100644 include/linux/page_hinting.h
create mode 100644 virt/kvm/page_hinting.c
diff --git a/arch/x86/Kbuild b/arch/x86/Kbuild
index c625f57472f7..3244df4ee311 100644
--- a/arch/x86/Kbuild
+++ b/arch/x86/Kbuild
@@ -2,7 +2,7 @@ obj-y += entry/
obj-$(CONFIG_PERF_EVENTS) += events/
-obj-$(CONFIG_KVM) += kvm/
+obj-$(subst m,y,$(CONFIG_KVM)) += kvm/
# Xen paravirtualization support
obj-$(CONFIG_XEN) += xen/
diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
index 72fa955f4a15..2fae31459706 100644
--- a/arch/x86/kvm/Kconfig
+++ b/arch/x86/kvm/Kconfig
@@ -96,6 +96,14 @@ config KVM_MMU_AUDIT
This option adds a R/W kVM module parameter 'mmu_audit', which allows
auditing of KVM MMU events at runtime.
+# KVM_FREE_PAGE_HINTING will allow the guest to report the free pages to the
+# host in regular interval of time.
+config KVM_FREE_PAGE_HINTING
+ def_bool y
+ depends on KVM
+ select VIRTIO
+ select VIRTIO_BALLOON
+
# OK, it's a little counter-intuitive to do this, but it puts it neatly under
# the virtualization menu.
source "drivers/vhost/Kconfig"
diff --git a/arch/x86/kvm/Makefile b/arch/x86/kvm/Makefile
index 69b3a7c30013..78640a80501e 100644
--- a/arch/x86/kvm/Makefile
+++ b/arch/x86/kvm/Makefile
@@ -16,6 +16,8 @@ kvm-y += x86.o mmu.o emulate.o i8259.o irq.o lapic.o \
i8254.o ioapic.o irq_comm.o cpuid.o pmu.o mtrr.o \
hyperv.o page_track.o debugfs.o
+obj-$(CONFIG_KVM_FREE_PAGE_HINTING) += $(KVM)/page_hinting.o
+
kvm-intel-y += vmx/vmx.o vmx/vmenter.o vmx/pmu_intel.o vmx/vmcs12.o vmx/evmcs.o vmx/nested.o
kvm-amd-y += svm.o pmu_amd.o
diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index 5f5e25fd6149..e596527284ba 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -7,6 +7,7 @@
#include <linux/stddef.h>
#include <linux/linkage.h>
#include <linux/topology.h>
+#include <linux/page_hinting.h>
struct vm_area_struct;
@@ -456,6 +457,14 @@ static inline struct zonelist *node_zonelist(int nid, gfp_t flags)
return NODE_DATA(nid)->node_zonelists + gfp_zonelist(flags);
}
+#ifdef CONFIG_KVM_FREE_PAGE_HINTING
+#define HAVE_ARCH_FREE_PAGE
+static inline void arch_free_page(struct page *page, int order)
+{
+ guest_free_page(page, order);
+}
+#endif
+
#ifndef HAVE_ARCH_FREE_PAGE
static inline void arch_free_page(struct page *page, int order) { }
#endif
diff --git a/include/linux/page_hinting.h b/include/linux/page_hinting.h
new file mode 100644
index 000000000000..b54f7428f348
--- /dev/null
+++ b/include/linux/page_hinting.h
@@ -0,0 +1,17 @@
+/*
+ * Size of the array which is used to store the freed pages is defined by
+ * MAX_FGPT_ENTRIES. If possible, we have to find a better way using which
+ * we can get rid of the hardcoded array size.
+ */
+#define MAX_FGPT_ENTRIES 1000
+/*
+ * hypervisor_pages - It is a dummy structure passed with the hypercall.
+ * @pfn: page frame number for the page which needs to be sent to the host.
+ * @order: order of the page needs to be reported to the host.
+ */
+struct hypervisor_pages {
+ unsigned long pfn;
+ unsigned int order;
+};
+
+void guest_free_page(struct page *page, int order);
diff --git a/virt/kvm/page_hinting.c b/virt/kvm/page_hinting.c
new file mode 100644
index 000000000000..818bd6b84e0c
--- /dev/null
+++ b/virt/kvm/page_hinting.c
@@ -0,0 +1,36 @@
+#include <linux/gfp.h>
+#include <linux/mm.h>
+#include <linux/kernel.h>
+
+/*
+ * struct kvm_free_pages - Tracks the pages which are freed by the guest.
+ * @pfn: page frame number for the page which is freed.
+ * @order: order corresponding to the page freed.
+ * @zonenum: zone number to which the freed page belongs.
+ */
+struct kvm_free_pages {
+ unsigned long pfn;
+ unsigned int order;
+ int zonenum;
+};
+
+/*
+ * struct page_hinting - holds array objects for the structures used to track
+ * guest free pages, along with an index variable for each of them.
+ * @kvm_pt: array object for the structure kvm_free_pages.
+ * @kvm_pt_idx: index for kvm_free_pages object.
+ * @hypervisor_pagelist: array object for the structure hypervisor_pages.
+ * @hyp_idx: index for hypervisor_pages object.
+ */
+struct page_hinting {
+ struct kvm_free_pages kvm_pt[MAX_FGPT_ENTRIES];
+ int kvm_pt_idx;
+ struct hypervisor_pages hypervisor_pagelist[MAX_FGPT_ENTRIES];
+ int hyp_idx;
+};
+
+DEFINE_PER_CPU(struct page_hinting, hinting_obj);
+
+void guest_free_page(struct page *page, int order)
+{
+}
--
2.17.2
next prev parent reply other threads:[~2019-02-04 20:20 UTC|newest]
Thread overview: 116+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-04 20:18 [RFC][Patch v8 0/7] KVM: Guest Free Page Hinting Nitesh Narayan Lal
2019-02-04 20:18 ` Nitesh Narayan Lal [this message]
2019-02-05 4:14 ` [RFC][Patch v8 1/7] KVM: Support for guest free page hinting Michael S. Tsirkin
2019-02-05 13:06 ` Nitesh Narayan Lal
2019-02-05 16:27 ` Michael S. Tsirkin
2019-02-05 16:34 ` Nitesh Narayan Lal
2019-02-04 20:18 ` [RFC][Patch v8 2/7] KVM: Enabling guest free page hinting via static key Nitesh Narayan Lal
2019-02-08 18:07 ` Alexander Duyck
2019-02-08 18:22 ` Nitesh Narayan Lal
2019-02-04 20:18 ` [RFC][Patch v8 3/7] KVM: Guest free page hinting functional skeleton Nitesh Narayan Lal
2019-02-04 20:18 ` [RFC][Patch v8 4/7] KVM: Disabling page poisoning to prevent corruption Nitesh Narayan Lal
2019-02-07 17:23 ` Alexander Duyck
2019-02-07 17:56 ` Nitesh Narayan Lal
2019-02-07 18:24 ` Alexander Duyck
2019-02-07 19:14 ` Michael S. Tsirkin
2019-02-07 21:08 ` Michael S. Tsirkin
2019-02-04 20:18 ` [RFC][Patch v8 5/7] virtio: Enables to add a single descriptor to the host Nitesh Narayan Lal
2019-02-05 20:49 ` Michael S. Tsirkin
2019-02-06 12:56 ` Nitesh Narayan Lal
2019-02-06 13:15 ` Luiz Capitulino
2019-02-06 13:24 ` Nitesh Narayan Lal
2019-02-06 13:29 ` Luiz Capitulino
2019-02-06 14:05 ` Nitesh Narayan Lal
2019-02-06 18:03 ` Michael S. Tsirkin
2019-02-06 18:19 ` Nitesh Narayan Lal
2019-02-04 20:18 ` [RFC][Patch v8 6/7] KVM: Enables the kernel to isolate and report free pages Nitesh Narayan Lal
2019-02-05 20:45 ` Michael S. Tsirkin
2019-02-05 21:54 ` Nitesh Narayan Lal
2019-02-05 21:55 ` Michael S. Tsirkin
2019-02-07 17:43 ` Alexander Duyck
2019-02-07 19:01 ` Michael S. Tsirkin
2019-02-07 20:50 ` Nitesh Narayan Lal
2019-02-08 17:58 ` Alexander Duyck
2019-02-08 20:41 ` Nitesh Narayan Lal
2019-02-08 21:38 ` Michael S. Tsirkin
2019-02-08 22:05 ` Alexander Duyck
2019-02-10 0:38 ` Michael S. Tsirkin
2019-02-11 9:28 ` David Hildenbrand
2019-02-12 5:16 ` Michael S. Tsirkin
2019-02-12 17:10 ` Nitesh Narayan Lal
2019-02-08 21:35 ` Michael S. Tsirkin
2019-02-04 20:18 ` [RFC][Patch v8 7/7] KVM: Adding tracepoints for guest page hinting Nitesh Narayan Lal
2019-02-04 20:20 ` [RFC][QEMU PATCH] KVM: Support for guest free " Nitesh Narayan Lal
2019-02-12 9:03 ` [RFC][Patch v8 0/7] KVM: Guest Free Page Hinting Wang, Wei W
2019-02-12 9:24 ` David Hildenbrand
2019-02-12 17:24 ` Nitesh Narayan Lal
2019-02-12 19:34 ` David Hildenbrand
2019-02-13 8:55 ` Wang, Wei W
2019-02-13 9:19 ` David Hildenbrand
2019-02-13 12:17 ` Nitesh Narayan Lal
2019-02-13 17:09 ` Michael S. Tsirkin
2019-02-13 17:22 ` Nitesh Narayan Lal
[not found] ` <286AC319A985734F985F78AFA26841F73DF6F1C3@shsmsx102.ccr.corp.intel.com>
2019-02-14 9:34 ` David Hildenbrand
2019-02-13 17:16 ` Michael S. Tsirkin
2019-02-13 17:59 ` David Hildenbrand
2019-02-13 19:08 ` Michael S. Tsirkin
2019-02-14 9:08 ` Wang, Wei W
2019-02-14 10:00 ` David Hildenbrand
2019-02-14 10:44 ` David Hildenbrand
2019-02-15 9:15 ` Wang, Wei W
2019-02-15 9:33 ` David Hildenbrand
2019-02-13 9:00 ` Wang, Wei W
2019-02-13 12:06 ` Nitesh Narayan Lal
2019-02-14 8:48 ` Wang, Wei W
2019-02-14 9:42 ` David Hildenbrand
2019-02-15 9:05 ` Wang, Wei W
2019-02-15 9:41 ` David Hildenbrand
2019-02-18 2:36 ` Wei Wang
2019-02-18 2:39 ` Wei Wang
2019-02-15 12:40 ` Nitesh Narayan Lal
2019-02-14 13:00 ` Nitesh Narayan Lal
2019-02-16 9:40 ` David Hildenbrand
2019-02-18 15:50 ` Nitesh Narayan Lal
2019-02-18 16:02 ` David Hildenbrand
2019-02-18 16:49 ` Michael S. Tsirkin
2019-02-18 16:59 ` David Hildenbrand
2019-02-18 17:31 ` Alexander Duyck
2019-02-18 17:41 ` David Hildenbrand
2019-02-18 23:47 ` Alexander Duyck
2019-02-19 2:45 ` Michael S. Tsirkin
2019-02-19 2:46 ` Andrea Arcangeli
2019-02-19 12:52 ` Nitesh Narayan Lal
2019-02-19 16:23 ` Alexander Duyck
2019-02-19 8:06 ` David Hildenbrand
2019-02-19 14:40 ` Michael S. Tsirkin
2019-02-19 14:44 ` David Hildenbrand
2019-02-19 14:45 ` David Hildenbrand
2019-02-18 18:01 ` Michael S. Tsirkin
2019-02-18 17:54 ` Michael S. Tsirkin
2019-02-18 18:29 ` David Hildenbrand
2019-02-18 19:16 ` Michael S. Tsirkin
2019-02-18 19:35 ` David Hildenbrand
2019-02-18 19:47 ` Michael S. Tsirkin
2019-02-18 20:04 ` David Hildenbrand
2019-02-18 20:31 ` Michael S. Tsirkin
2019-02-18 20:40 ` Nitesh Narayan Lal
2019-02-18 21:04 ` David Hildenbrand
2019-02-19 0:01 ` Alexander Duyck
2019-02-19 7:54 ` David Hildenbrand
2019-02-19 18:06 ` Alexander Duyck
2019-02-19 18:31 ` David Hildenbrand
2019-02-19 21:57 ` Alexander Duyck
2019-02-19 22:17 ` Michael S. Tsirkin
2019-02-19 22:36 ` David Hildenbrand
2019-02-19 19:58 ` Michael S. Tsirkin
2019-02-19 20:02 ` David Hildenbrand
2019-02-19 20:17 ` Michael S. Tsirkin
2019-02-19 20:21 ` David Hildenbrand
2019-02-19 20:35 ` Michael S. Tsirkin
2019-02-19 12:47 ` Nitesh Narayan Lal
2019-02-19 13:03 ` David Hildenbrand
2019-02-19 14:17 ` Nitesh Narayan Lal
2019-02-19 14:21 ` David Hildenbrand
2019-02-18 20:53 ` David Hildenbrand
2019-02-23 0:02 ` Alexander Duyck
2019-02-25 13:01 ` Nitesh Narayan Lal
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