From af3bba761a1208c8515bcc72fc48d0f9045d040c Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Thu, 14 Feb 2019 18:35:52 +0100 Subject: vhost-net: compile it on all targets that have virtio-net. This shows a preexisting bug: if a KVM target did not have virtio-net enabled, it would fail with undefined symbols when vhost was enabled. This must now be fixed, lest targets that have no virtio-net fail to compile. Reviewed-by: Philippe Mathieu-Daudé Signed-off-by: Paolo Bonzini Reviewed-by: Thomas Huth Message-Id: <1543851204-41186-5-git-send-email-pbonzini@redhat.com> Message-Id: <1550165756-21617-6-git-send-email-pbonzini@redhat.com> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- include/exec/poison.h | 1 - 1 file changed, 1 deletion(-) (limited to 'include') diff --git a/include/exec/poison.h b/include/exec/poison.h index ecdc83c147..1a7a57baae 100644 --- a/include/exec/poison.h +++ b/include/exec/poison.h @@ -86,7 +86,6 @@ #pragma GCC poison CONFIG_XTENSA_DIS #pragma GCC poison CONFIG_LINUX_USER -#pragma GCC poison CONFIG_VHOST_NET #pragma GCC poison CONFIG_KVM #pragma GCC poison CONFIG_SOFTMMU -- cgit v1.2.3-55-g7522 From ed48c59875b603058366490f472490f0fb9c30f3 Mon Sep 17 00:00:00 2001 From: David Gibson Date: Thu, 14 Feb 2019 15:39:16 +1100 Subject: virtio-balloon: Safely handle BALLOON_PAGE_SIZE < host page size The virtio-balloon always works in units of 4kiB (BALLOON_PAGE_SIZE), but we can only actually discard memory in units of the host page size. Now, we handle this very badly: we silently ignore balloon requests that aren't host page aligned, and for requests that are host page aligned we discard the entire host page. The latter can corrupt guest memory if its page size is smaller than the host's. The obvious choice would be to disable the balloon if the host page size is not 4kiB. However, that would break the special case where host and guest have the same page size, but that's larger than 4kiB. That case currently works by accident[1] - and is used in practice on many production POWER systems where 64kiB has long been the Linux default page size on both host and guest. To make the balloon safe, without breaking that useful special case, we need to accumulate 4kiB balloon requests until we have a whole contiguous host page to discard. We could in principle do that across all guest memory, but it would require a large bitmap to track. This patch represents a compromise: we track ballooned subpages for a single contiguous host page at a time. This means that if the guest discards all 4kiB chunks of a host page in succession, we will discard it. This is the expected behaviour in the (host page) == (guest page) != 4kiB case we want to support. If the guest scatters 4kiB requests across different host pages, we don't discard anything, and issue a warning. Not ideal, but at least we don't corrupt guest memory as the previous version could. Warning reporting is kind of a compromise here. Determining whether we're in a problematic state at realize() time is tricky, because we'd have to look at the host pagesizes of all memory backends, but we can't really know if some of those backends could be for special purpose memory that's not subject to ballooning. Reporting only when the guest tries to balloon a partial page also isn't great because if the guest page size happens to line up it won't indicate that we're in a non ideal situation. It could also cause alarming repeated warnings whenever a migration is attempted. So, what we do is warn the first time the guest attempts balloon a partial host page, whether or not it will end up ballooning the rest of the page immediately afterwards. [1] Because when the guest attempts to balloon a page, it will submit requests for each 4kiB subpage. Most will be ignored, but the one which happens to be host page aligned will discard the whole lot. Signed-off-by: David Gibson Message-Id: <20190214043916.22128-6-david@gibson.dropbear.id.au> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- hw/virtio/virtio-balloon.c | 69 ++++++++++++++++++++++++++++++++------ include/hw/virtio/virtio-balloon.h | 3 ++ 2 files changed, 62 insertions(+), 10 deletions(-) (limited to 'include') diff --git a/hw/virtio/virtio-balloon.c b/hw/virtio/virtio-balloon.c index e4cd8d566b..d3f2913a85 100644 --- a/hw/virtio/virtio-balloon.c +++ b/hw/virtio/virtio-balloon.c @@ -33,33 +33,82 @@ #define BALLOON_PAGE_SIZE (1 << VIRTIO_BALLOON_PFN_SHIFT) +struct PartiallyBalloonedPage { + RAMBlock *rb; + ram_addr_t base; + unsigned long bitmap[]; +}; + static void balloon_inflate_page(VirtIOBalloon *balloon, MemoryRegion *mr, hwaddr offset) { void *addr = memory_region_get_ram_ptr(mr) + offset; RAMBlock *rb; size_t rb_page_size; - ram_addr_t ram_offset; + int subpages; + ram_addr_t ram_offset, host_page_base; /* XXX is there a better way to get to the RAMBlock than via a * host address? */ rb = qemu_ram_block_from_host(addr, false, &ram_offset); rb_page_size = qemu_ram_pagesize(rb); + host_page_base = ram_offset & ~(rb_page_size - 1); - /* Silently ignore hugepage RAM blocks */ - if (rb_page_size != getpagesize()) { + if (rb_page_size == BALLOON_PAGE_SIZE) { + /* Easy case */ + + ram_block_discard_range(rb, ram_offset, rb_page_size); + /* We ignore errors from ram_block_discard_range(), because it + * has already reported them, and failing to discard a balloon + * page is not fatal */ return; } - /* Silently ignore unaligned requests */ - if (ram_offset & (rb_page_size - 1)) { - return; + /* Hard case + * + * We've put a piece of a larger host page into the balloon - we + * need to keep track until we have a whole host page to + * discard + */ + warn_report_once( +"Balloon used with backing page size > 4kiB, this may not be reliable"); + + subpages = rb_page_size / BALLOON_PAGE_SIZE; + + if (balloon->pbp + && (rb != balloon->pbp->rb + || host_page_base != balloon->pbp->base)) { + /* We've partially ballooned part of a host page, but now + * we're trying to balloon part of a different one. Too hard, + * give up on the old partial page */ + free(balloon->pbp); + balloon->pbp = NULL; } - ram_block_discard_range(rb, ram_offset, rb_page_size); - /* We ignore errors from ram_block_discard_range(), because it has - * already reported them, and failing to discard a balloon page is - * not fatal */ + if (!balloon->pbp) { + /* Starting on a new host page */ + size_t bitlen = BITS_TO_LONGS(subpages) * sizeof(unsigned long); + balloon->pbp = g_malloc0(sizeof(PartiallyBalloonedPage) + bitlen); + balloon->pbp->rb = rb; + balloon->pbp->base = host_page_base; + } + + bitmap_set(balloon->pbp->bitmap, + (ram_offset - balloon->pbp->base) / BALLOON_PAGE_SIZE, + subpages); + + if (bitmap_full(balloon->pbp->bitmap, subpages)) { + /* We've accumulated a full host page, we can actually discard + * it now */ + + ram_block_discard_range(rb, balloon->pbp->base, rb_page_size); + /* We ignore errors from ram_block_discard_range(), because it + * has already reported them, and failing to discard a balloon + * page is not fatal */ + + free(balloon->pbp); + balloon->pbp = NULL; + } } static const char *balloon_stat_names[] = { diff --git a/include/hw/virtio/virtio-balloon.h b/include/hw/virtio/virtio-balloon.h index e0df3528c8..99dcd6d105 100644 --- a/include/hw/virtio/virtio-balloon.h +++ b/include/hw/virtio/virtio-balloon.h @@ -30,6 +30,8 @@ typedef struct virtio_balloon_stat_modern { uint64_t val; } VirtIOBalloonStatModern; +typedef struct PartiallyBalloonedPage PartiallyBalloonedPage; + typedef struct VirtIOBalloon { VirtIODevice parent_obj; VirtQueue *ivq, *dvq, *svq; @@ -42,6 +44,7 @@ typedef struct VirtIOBalloon { int64_t stats_last_update; int64_t stats_poll_interval; uint32_t host_features; + PartiallyBalloonedPage *pbp; } VirtIOBalloon; #endif -- cgit v1.2.3-55-g7522 From ee1cd0099ab04f748c6d839e4f4d9a41b21e7399 Mon Sep 17 00:00:00 2001 From: Alexey Kardashevskiy Date: Thu, 14 Feb 2019 16:14:40 +1100 Subject: pci: Move NVIDIA vendor id to the rest of ids sPAPR code will use it too so move it from VFIO to the common code. Signed-off-by: Alexey Kardashevskiy Reviewed-by: David Gibson Reviewed-by: Alistair Francis Message-Id: <20190214051440.59167-1-aik@ozlabs.ru> Acked-by: Alex Williamson Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- hw/vfio/pci-quirks.c | 2 -- include/hw/pci/pci_ids.h | 2 ++ 2 files changed, 2 insertions(+), 2 deletions(-) (limited to 'include') diff --git a/hw/vfio/pci-quirks.c b/hw/vfio/pci-quirks.c index eae31c74d6..40a12001f5 100644 --- a/hw/vfio/pci-quirks.c +++ b/hw/vfio/pci-quirks.c @@ -526,8 +526,6 @@ static void vfio_probe_ati_bar2_quirk(VFIOPCIDevice *vdev, int nr) * note it for future reference. */ -#define PCI_VENDOR_ID_NVIDIA 0x10de - /* * Nvidia has several different methods to get to config space, the * nouveu project has several of these documented here: diff --git a/include/hw/pci/pci_ids.h b/include/hw/pci/pci_ids.h index eeb33018ad..0abe27a53a 100644 --- a/include/hw/pci/pci_ids.h +++ b/include/hw/pci/pci_ids.h @@ -271,4 +271,6 @@ #define PCI_VENDOR_ID_SYNOPSYS 0x16C3 +#define PCI_VENDOR_ID_NVIDIA 0x10de + #endif -- cgit v1.2.3-55-g7522 From b81a5f9427270133c27ab660c0054b277b2728d7 Mon Sep 17 00:00:00 2001 From: Daniel P. Berrangé Date: Fri, 15 Feb 2019 15:36:00 +0000 Subject: hw/smbios: fix offset of type 3 sku field The type 3 SMBIOS structure[1] ends with fields ... 0x14 - contained element count 0x15 - contained element record length 0x16 - sku number The smbios_type_3 struct missed the contained element record length field, causing sku number to be reported at the wrong offset. [1] https://www.dmtf.org/sites/default/files/standards/documents/DSP0134_3.1.1.pdf Signed-off-by: Daniel P. Berrangé Message-Id: <20190215153600.1770727-1-berrange@redhat.com> Reviewed-by: Igor Mammedov Fixes: e41fca3da72 Reviewed-by: Philippe Mathieu-Daudé Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- hw/smbios/smbios.c | 1 + include/hw/firmware/smbios.h | 1 + 2 files changed, 2 insertions(+) (limited to 'include') diff --git a/hw/smbios/smbios.c b/hw/smbios/smbios.c index 818be8a838..47be9071fa 100644 --- a/hw/smbios/smbios.c +++ b/hw/smbios/smbios.c @@ -563,6 +563,7 @@ static void smbios_build_type_3_table(void) t->height = 0; t->number_of_power_cords = 0; t->contained_element_count = 0; + t->contained_element_record_length = 0; SMBIOS_TABLE_SET_STR(3, sku_number_str, type3.sku); SMBIOS_BUILD_TABLE_POST; diff --git a/include/hw/firmware/smbios.h b/include/hw/firmware/smbios.h index eeb5a4d7b6..6fef32a3c9 100644 --- a/include/hw/firmware/smbios.h +++ b/include/hw/firmware/smbios.h @@ -162,6 +162,7 @@ struct smbios_type_3 { uint8_t height; uint8_t number_of_power_cords; uint8_t contained_element_count; + uint8_t contained_element_record_length; uint8_t sku_number_str; /* contained elements follow */ } QEMU_PACKED; -- cgit v1.2.3-55-g7522