95 lines
4.1 KiB
Diff
95 lines
4.1 KiB
Diff
From a5b4eec5f456b1ca3fe753e1d76f96cf3f8914ef Mon Sep 17 00:00:00 2001
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From: David Hildenbrand <david@redhat.com>
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Date: Wed, 17 Jan 2024 14:55:53 +0100
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Subject: [PATCH 01/22] hv-balloon: use get_min_alignment() to express 32 GiB
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alignment
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RH-Author: David Hildenbrand <david@redhat.com>
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RH-MergeRequest: 221: memory-device: reintroduce memory region size check
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RH-Jira: RHEL-20341
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Acked-by: Igor Mammedov <imammedo@redhat.com>
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RH-Commit: [1/2] cbe092fe549552928270892253b31cd8fe199825
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https://issues.redhat.com/browse/RHEL-20341
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Let's implement the get_min_alignment() callback for memory devices, and
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copy for the device memory region the alignment of the host memory
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region. This mimics what virtio-mem does, and allows for re-introducing
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proper alignment checks for the memory region size (where we don't care
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about additional device requirements) in memory device core.
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Message-ID: <20240117135554.787344-2-david@redhat.com>
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Reviewed-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com>
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Signed-off-by: David Hildenbrand <david@redhat.com>
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(cherry picked from commit f77c5f38f49c71bc14cf1019ac92b0b95f572414)
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Signed-off-by: David Hildenbrand <david@redhat.com>
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---
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hw/hyperv/hv-balloon.c | 37 +++++++++++++++++++++----------------
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1 file changed, 21 insertions(+), 16 deletions(-)
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diff --git a/hw/hyperv/hv-balloon.c b/hw/hyperv/hv-balloon.c
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index 66f297c1d7..0829c495b0 100644
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--- a/hw/hyperv/hv-balloon.c
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+++ b/hw/hyperv/hv-balloon.c
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@@ -1476,22 +1476,7 @@ static void hv_balloon_ensure_mr(HvBalloon *balloon)
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balloon->mr = g_new0(MemoryRegion, 1);
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memory_region_init(balloon->mr, OBJECT(balloon), TYPE_HV_BALLOON,
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memory_region_size(hostmem_mr));
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-
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- /*
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- * The VM can indicate an alignment up to 32 GiB. Memory device core can
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- * usually only handle/guarantee 1 GiB alignment. The user will have to
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- * specify a larger maxmem eventually.
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- *
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- * The memory device core will warn the user in case maxmem might have to be
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- * increased and will fail plugging the device if there is not sufficient
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- * space after alignment.
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- *
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- * TODO: we could do the alignment ourselves in a slightly bigger region.
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- * But this feels better, although the warning might be annoying. Maybe
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- * we can optimize that in the future (e.g., with such a device on the
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- * cmdline place/size the device memory region differently.
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- */
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- balloon->mr->align = MAX(32 * GiB, memory_region_get_alignment(hostmem_mr));
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+ balloon->mr->align = memory_region_get_alignment(hostmem_mr);
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}
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static void hv_balloon_free_mr(HvBalloon *balloon)
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@@ -1653,6 +1638,25 @@ static MemoryRegion *hv_balloon_md_get_memory_region(MemoryDeviceState *md,
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return balloon->mr;
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}
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+static uint64_t hv_balloon_md_get_min_alignment(const MemoryDeviceState *md)
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+{
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+ /*
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+ * The VM can indicate an alignment up to 32 GiB. Memory device core can
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+ * usually only handle/guarantee 1 GiB alignment. The user will have to
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+ * specify a larger maxmem eventually.
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+ *
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+ * The memory device core will warn the user in case maxmem might have to be
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+ * increased and will fail plugging the device if there is not sufficient
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+ * space after alignment.
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+ *
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+ * TODO: we could do the alignment ourselves in a slightly bigger region.
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+ * But this feels better, although the warning might be annoying. Maybe
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+ * we can optimize that in the future (e.g., with such a device on the
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+ * cmdline place/size the device memory region differently.
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+ */
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+ return 32 * GiB;
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+}
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+
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static void hv_balloon_md_fill_device_info(const MemoryDeviceState *md,
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MemoryDeviceInfo *info)
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{
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@@ -1765,5 +1769,6 @@ static void hv_balloon_class_init(ObjectClass *klass, void *data)
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mdc->get_memory_region = hv_balloon_md_get_memory_region;
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mdc->decide_memslots = hv_balloon_decide_memslots;
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mdc->get_memslots = hv_balloon_get_memslots;
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+ mdc->get_min_alignment = hv_balloon_md_get_min_alignment;
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mdc->fill_device_info = hv_balloon_md_fill_device_info;
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}
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--
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2.39.3
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