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From c39a8362df8c09b9c66bb9c5295dc26373244fed Mon Sep 17 00:00:00 2001
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From: David Hildenbrand <david@redhat.com>
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Date: Mon, 26 Nov 2018 09:57:34 +0000
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Subject: [PATCH 35/35] pc-dimm: turn alignment assert into check
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RH-Author: David Hildenbrand <david@redhat.com>
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Message-id: <20181126095734.30666-1-david@redhat.com>
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Patchwork-id: 83163
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O-Subject: [RHEL-8.0 qemu-kvm PATCH] pc-dimm: turn alignment assert into check
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Bugzilla: 1630116
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RH-Acked-by: Pankaj Gupta <pagupta@redhat.com>
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RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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RH-Acked-by: Igor Mammedov <imammedo@redhat.com>
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BZ: https://bugzilla.redhat.com/show_bug.cgi?id=1630116
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Brew: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=19276337
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Upstream: 4d8938a05db15dea2c86c4ab9c5f872f160d2188
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Branch: rhel8/master-2.12.0
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The start of the address space indicates which maximum alignment is
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supported by our machine (e.g. ppc, x86 1GB). This is helpful to
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catch fragmenting guest physical memory in strange fashions.
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Right now we can crash QEMU by e.g. (there might be easier examples)
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qemu-system-x86_64 -m 256M,maxmem=20G,slots=2 \
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-object memory-backend-file,id=mem0,size=8192M,mem-path=/dev/zero,align=8192M \
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-device pc-dimm,id=dimm1,memdev=mem0
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Backport conflicts:
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hw/mem/memory-device.c: The memory device refactoring is part of 3.0,
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so fix it in previous pc-dimm code.
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Note: The upstream patch missed a "x" (0% .. vs. 0x% ..), which was
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fixed in 7c63ba2055a0 ("memory-device: fix alignment error message"),
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however as this is not a clean cherry pick, I'm fixing it right
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away (like in the RHEL7.6 backport).
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Signed-off-by: David Hildenbrand <david@redhat.com>
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Message-Id: <20180607154705.6316-2-david@redhat.com>
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Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
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Reviewed-by: Igor Mammedov <imammedo@redhat.com>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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(cherry picked from commit 4d8938a05db15dea2c86c4ab9c5f872f160d2188)
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Signed-off-by: David Hildenbrand <david@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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hw/mem/pc-dimm.c | 9 +++++++--
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1 file changed, 7 insertions(+), 2 deletions(-)
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diff --git a/hw/mem/pc-dimm.c b/hw/mem/pc-dimm.c
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index 51350d9..a9d7c51 100644
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--- a/hw/mem/pc-dimm.c
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+++ b/hw/mem/pc-dimm.c
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@@ -298,14 +298,19 @@ uint64_t pc_dimm_get_free_addr(uint64_t address_space_start,
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uint64_t new_addr, ret = 0;
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uint64_t address_space_end = address_space_start + address_space_size;
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- g_assert(QEMU_ALIGN_UP(address_space_start, align) == address_space_start);
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-
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if (!address_space_size) {
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error_setg(errp, "memory hotplug is not enabled, "
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"please add maxmem option");
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goto out;
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}
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+ /* address_space_start indicates the maximum alignment we expect */
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+ if (QEMU_ALIGN_UP(address_space_start, align) != address_space_start) {
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+ error_setg(errp, "the alignment (0x%" PRIx64 ") is not supported",
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+ align);
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+ goto out;
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+ }
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+
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if (hint && QEMU_ALIGN_UP(*hint, align) != *hint) {
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error_setg(errp, "address must be aligned to 0x%" PRIx64 " bytes",
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align);
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--
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1.8.3.1
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