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118 lines
4.2 KiB
118 lines
4.2 KiB
From 4827d5be5357ab89e0c46f606ad828bf97d36471 Mon Sep 17 00:00:00 2001
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From: Peter Xu <peterx@redhat.com>
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Date: Wed, 19 Apr 2023 12:17:38 -0400
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Subject: [PATCH 04/56] migration/postcopy: Detect file system on dest host
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Peter Xu <peterx@redhat.com>
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RH-MergeRequest: 162: migration: Pretty failures for postcopy on unsupported memory types
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RH-Bugzilla: 2057267
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RH-Acked-by: Leonardo Brás <leobras@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Acked-by: quintela1 <quintela@redhat.com>
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RH-Commit: [3/50] 121aeeda8a019f79dba6c077c7018bd1c86f3d71 (peterx/qemu-kvm)
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Postcopy requires the memory support userfaultfd to work. Right now we
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check it but it's a bit too late (when switching to postcopy migration).
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Do that early right at enabling of postcopy.
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Note that this is still only a best effort because ramblocks can be
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dynamically created. We can add check in hostmem creations and fail if
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postcopy enabled, but maybe that's too aggressive.
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Still, we have chance to fail the most obvious where we know there's an
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existing unsupported ramblock.
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Signed-off-by: Peter Xu <peterx@redhat.com>
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Reviewed-by: Juan Quintela <quintela@redhat.com>
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Signed-off-by: Juan Quintela <quintela@redhat.com>
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(cherry picked from commit ae30b9b2892b85e6c3d5c0b8d1949c4d77a2954a)
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Signed-off-by: Peter Xu <peterx@redhat.com>
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---
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migration/postcopy-ram.c | 34 ++++++++++++++++++++++++++++++----
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1 file changed, 30 insertions(+), 4 deletions(-)
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diff --git a/migration/postcopy-ram.c b/migration/postcopy-ram.c
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index 93f39f8e06..bbb8af61ae 100644
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--- a/migration/postcopy-ram.c
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+++ b/migration/postcopy-ram.c
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@@ -36,6 +36,7 @@
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#include "yank_functions.h"
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#include "tls.h"
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#include "qemu/userfaultfd.h"
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+#include "qemu/mmap-alloc.h"
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/* Arbitrary limit on size of each discard command,
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* keeps them around ~200 bytes
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@@ -336,11 +337,12 @@ static bool ufd_check_and_apply(int ufd, MigrationIncomingState *mis)
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/* Callback from postcopy_ram_supported_by_host block iterator.
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*/
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-static int test_ramblock_postcopiable(RAMBlock *rb, void *opaque)
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+static int test_ramblock_postcopiable(RAMBlock *rb)
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{
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const char *block_name = qemu_ram_get_idstr(rb);
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ram_addr_t length = qemu_ram_get_used_length(rb);
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size_t pagesize = qemu_ram_pagesize(rb);
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+ QemuFsType fs;
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if (length % pagesize) {
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error_report("Postcopy requires RAM blocks to be a page size multiple,"
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@@ -348,6 +350,15 @@ static int test_ramblock_postcopiable(RAMBlock *rb, void *opaque)
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"page size of 0x%zx", block_name, length, pagesize);
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return 1;
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}
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+
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+ if (rb->fd >= 0) {
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+ fs = qemu_fd_getfs(rb->fd);
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+ if (fs != QEMU_FS_TYPE_TMPFS && fs != QEMU_FS_TYPE_HUGETLBFS) {
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+ error_report("Host backend files need to be TMPFS or HUGETLBFS only");
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+ return 1;
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+ }
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+ }
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+
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return 0;
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}
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@@ -366,6 +377,7 @@ bool postcopy_ram_supported_by_host(MigrationIncomingState *mis)
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struct uffdio_range range_struct;
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uint64_t feature_mask;
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Error *local_err = NULL;
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+ RAMBlock *block;
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if (qemu_target_page_size() > pagesize) {
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error_report("Target page size bigger than host page size");
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@@ -390,9 +402,23 @@ bool postcopy_ram_supported_by_host(MigrationIncomingState *mis)
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goto out;
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}
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- /* We don't support postcopy with shared RAM yet */
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- if (foreach_not_ignored_block(test_ramblock_postcopiable, NULL)) {
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- goto out;
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+ /*
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+ * We don't support postcopy with some type of ramblocks.
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+ *
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+ * NOTE: we explicitly ignored ramblock_is_ignored() instead we checked
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+ * all possible ramblocks. This is because this function can be called
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+ * when creating the migration object, during the phase RAM_MIGRATABLE
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+ * is not even properly set for all the ramblocks.
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+ *
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+ * A side effect of this is we'll also check against RAM_SHARED
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+ * ramblocks even if migrate_ignore_shared() is set (in which case
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+ * we'll never migrate RAM_SHARED at all), but normally this shouldn't
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+ * affect in reality, or we can revisit.
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+ */
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+ RAMBLOCK_FOREACH(block) {
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+ if (test_ramblock_postcopiable(block)) {
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+ goto out;
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+ }
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}
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/*
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--
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2.39.1
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