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[209.132.183.28]) by mx.google.com with ESMTPS id n21si516952qki.15.2019.03.06.07.52.40 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 06 Mar 2019 07:52:41 -0800 (PST) Received-SPF: pass (google.com: domain of nitesh@redhat.com designates 209.132.183.28 as permitted sender) client-ip=209.132.183.28; Authentication-Results: mx.google.com; spf=pass (google.com: domain of nitesh@redhat.com designates 209.132.183.28 as permitted sender) smtp.mailfrom=nitesh@redhat.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 34F0AE6A74; Wed, 6 Mar 2019 15:52:40 +0000 (UTC) Received: from virtlab420.virt.lab.eng.bos.redhat.com (virtlab420.virt.lab.eng.bos.redhat.com [10.19.152.148]) by smtp.corp.redhat.com (Postfix) with ESMTP id DBE1960139; Wed, 6 Mar 2019 15:52:29 +0000 (UTC) From: Nitesh Narayan Lal To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.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, alexander.duyck@gmail.com Cc: Nitesh Narayan Lal Subject: [RFC][QEMU Patch] KVM: Enable QEMU to free the pages hinted by the guest Date: Wed, 6 Mar 2019 10:52:20 -0500 Message-Id: <20190306155220.12944-1-nitesh@redhat.com> In-Reply-To: <20190306155048.12868-1-nitesh@redhat.com> References: <20190306155048.12868-1-nitesh@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.38]); Wed, 06 Mar 2019 15:52:40 +0000 (UTC) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: X-Virus-Scanned: ClamAV using ClamSMTP This patch enables QEMU to perform MADVISE_DONTNEED on the pages reported by the guest. Signed-off-by: Nitesh Narayan Lal --- hw/virtio/trace-events | 1 + hw/virtio/virtio-balloon.c | 90 +++++++++++++++++++ include/hw/virtio/virtio-balloon.h | 2 +- .../standard-headers/linux/virtio_balloon.h | 1 + 4 files changed, 93 insertions(+), 1 deletion(-) diff --git a/hw/virtio/trace-events b/hw/virtio/trace-events index 07bcbe9e85..e3ab66f126 100644 --- a/hw/virtio/trace-events +++ b/hw/virtio/trace-events @@ -46,3 +46,4 @@ virtio_balloon_handle_output(const char *name, uint64_t gpa) "section name: %s g virtio_balloon_get_config(uint32_t num_pages, uint32_t actual) "num_pages: %d actual: %d" virtio_balloon_set_config(uint32_t actual, uint32_t oldactual) "actual: %d oldactual: %d" virtio_balloon_to_target(uint64_t target, uint32_t num_pages) "balloon target: 0x%"PRIx64" num_pages: %d" +virtio_balloon_hinting_request(unsigned long pfn, unsigned int num_pages) "Guest page hinting request: %lu num_pages: %d" diff --git a/hw/virtio/virtio-balloon.c b/hw/virtio/virtio-balloon.c index a12677d4d5..7ab1471017 100644 --- a/hw/virtio/virtio-balloon.c +++ b/hw/virtio/virtio-balloon.c @@ -33,6 +33,13 @@ #define BALLOON_PAGE_SIZE (1 << VIRTIO_BALLOON_PFN_SHIFT) +struct guest_pages { + unsigned long pfn; + unsigned int order; +}; + +void page_hinting_request(uint64_t addr, uint32_t len); + static void balloon_page(void *addr, int deflate) { if (!qemu_balloon_is_inhibited()) { @@ -207,6 +214,85 @@ static void balloon_stats_set_poll_interval(Object *obj, Visitor *v, balloon_stats_change_timer(s, 0); } +static void *gpa2hva(MemoryRegion **p_mr, hwaddr addr, Error **errp) +{ + MemoryRegionSection mrs = memory_region_find(get_system_memory(), + addr, 1); + + if (!mrs.mr) { + error_setg(errp, "No memory is mapped at address 0x%" HWADDR_PRIx, addr); + return NULL; + } + + if (!memory_region_is_ram(mrs.mr) && !memory_region_is_romd(mrs.mr)) { + error_setg(errp, "Memory at address 0x%" HWADDR_PRIx "is not RAM", addr); + memory_region_unref(mrs.mr); + return NULL; + } + + *p_mr = mrs.mr; + return qemu_map_ram_ptr(mrs.mr->ram_block, mrs.offset_within_region); +} + +void page_hinting_request(uint64_t addr, uint32_t len) +{ + Error *local_err = NULL; + MemoryRegion *mr = NULL; + int ret = 0; + struct guest_pages *guest_obj; + int i = 0; + void *hvaddr_to_free; + unsigned long pfn, pfn_end; + uint64_t gpaddr_to_free; + void * temp_addr = gpa2hva(&mr, addr, &local_err); + + if (local_err) { + error_report_err(local_err); + return; + } + guest_obj = temp_addr; + while (i < len) { + pfn = guest_obj[i].pfn; + pfn_end = guest_obj[i].pfn + (1 << guest_obj[i].order) - 1; + trace_virtio_balloon_hinting_request(pfn,(1 << guest_obj[i].order)); + while (pfn <= pfn_end) { + gpaddr_to_free = pfn << VIRTIO_BALLOON_PFN_SHIFT; + hvaddr_to_free = gpa2hva(&mr, gpaddr_to_free, &local_err); + if (local_err) { + error_report_err(local_err); + return; + } + ret = qemu_madvise((void *)hvaddr_to_free, 4096, QEMU_MADV_DONTNEED); + if (ret == -1) + printf("\n%d:%s Error: Madvise failed with error:%d\n", __LINE__, __func__, ret); + pfn++; + } + i++; + } +} + +static void virtio_balloon_page_hinting(VirtIODevice *vdev, VirtQueue *vq) +{ + VirtQueueElement *elem = NULL; + uint64_t temp_addr; + uint32_t temp_len; + size_t size, t_size = 0; + + elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); + if (!elem) { + printf("\npop error\n"); + return; + } + size = iov_to_buf(elem->out_sg, elem->out_num, 0, &temp_addr, sizeof(temp_addr)); + t_size += size; + size = iov_to_buf(elem->out_sg, elem->out_num, 8, &temp_len, sizeof(temp_len)); + t_size += size; + page_hinting_request(temp_addr, temp_len); + virtqueue_push(vq, elem, t_size); + virtio_notify(vdev, vq); + g_free(elem); +} + static void virtio_balloon_handle_output(VirtIODevice *vdev, VirtQueue *vq) { VirtIOBalloon *s = VIRTIO_BALLOON(vdev); @@ -376,6 +462,7 @@ static uint64_t virtio_balloon_get_features(VirtIODevice *vdev, uint64_t f, VirtIOBalloon *dev = VIRTIO_BALLOON(vdev); f |= dev->host_features; virtio_add_feature(&f, VIRTIO_BALLOON_F_STATS_VQ); + virtio_add_feature(&f, VIRTIO_BALLOON_F_HINTING); return f; } @@ -445,6 +532,7 @@ static void virtio_balloon_device_realize(DeviceState *dev, Error **errp) s->ivq = virtio_add_queue(vdev, 128, virtio_balloon_handle_output); s->dvq = virtio_add_queue(vdev, 128, virtio_balloon_handle_output); s->svq = virtio_add_queue(vdev, 128, virtio_balloon_receive_stats); + s->hvq = virtio_add_queue(vdev, 128, virtio_balloon_page_hinting); reset_stats(s); } @@ -488,6 +576,8 @@ static void virtio_balloon_instance_init(Object *obj) object_property_add(obj, "guest-stats", "guest statistics", balloon_stats_get_all, NULL, NULL, s, NULL); + object_property_add(obj, "guest-page-hinting", "guest page hinting", + NULL, NULL, NULL, s, NULL); object_property_add(obj, "guest-stats-polling-interval", "int", balloon_stats_get_poll_interval, diff --git a/include/hw/virtio/virtio-balloon.h b/include/hw/virtio/virtio-balloon.h index e0df3528c8..774498a6ca 100644 --- a/include/hw/virtio/virtio-balloon.h +++ b/include/hw/virtio/virtio-balloon.h @@ -32,7 +32,7 @@ typedef struct virtio_balloon_stat_modern { typedef struct VirtIOBalloon { VirtIODevice parent_obj; - VirtQueue *ivq, *dvq, *svq; + VirtQueue *ivq, *dvq, *svq, *hvq; uint32_t num_pages; uint32_t actual; uint64_t stats[VIRTIO_BALLOON_S_NR]; diff --git a/include/standard-headers/linux/virtio_balloon.h b/include/standard-headers/linux/virtio_balloon.h index 4dbb7dc6c0..f50c0d95ea 100644 --- a/include/standard-headers/linux/virtio_balloon.h +++ b/include/standard-headers/linux/virtio_balloon.h @@ -34,6 +34,7 @@ #define VIRTIO_BALLOON_F_MUST_TELL_HOST 0 /* Tell before reclaiming pages */ #define VIRTIO_BALLOON_F_STATS_VQ 1 /* Memory Stats virtqueue */ #define VIRTIO_BALLOON_F_DEFLATE_ON_OOM 2 /* Deflate balloon on OOM */ +#define VIRTIO_BALLOON_F_HINTING 5 /* Page hinting virtqueue */ /* Size of a PFN in the balloon interface. */ #define VIRTIO_BALLOON_PFN_SHIFT 12