import libguestfs-1.46.1-4.el9_0
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From 06cf41cdddfde07871a7f7033ba8c5ccc184a1fb Mon Sep 17 00:00:00 2001
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From: "Richard W.M. Jones" <rjones@redhat.com>
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Date: Thu, 12 May 2022 08:36:37 +0100
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Subject: [PATCH] lib: Disable 5-level page tables when using -cpu max
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In https://bugzilla.redhat.com/show_bug.cgi?id=2082806 we've been
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tracking an insidious qemu bug which intermittently prevents the
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libguestfs appliance from starting. The symptoms are that SeaBIOS
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starts and displays its messages, but the kernel isn't reached. We
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found that the kernel does in fact start, but when it tries to set up
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page tables and jump to protected mode it gets a triple fault which
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causes the emulated CPU in qemu to reset (qemu exits).
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This seems to only affect TCG (not KVM).
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Yesterday I found that this is caused by using -cpu max which enables
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the "la57" feature (5-level page tables[0]), and that we can make the
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problem go away using -cpu max,la57=off. Note that I still don't
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fully understand the qemu bug, so this is only a workaround.
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I chose to disable 5-level page tables for both TCG and KVM, partly to
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make the patch simpler, and partly because I guess it's not a feature
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(ie. 57 bit linear addresses) that is useful for the libguestfs
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appliance case, where we have limited physical memory and no need to
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run any programs with huge address spaces.
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I tested this by running both the direct & libvirt paths overnight. I
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expect that this patch will fail with old qemu/libvirt which doesn't
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understand the "la57" feature, but this is only intended as a
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temporary workaround.
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[0] Article about 5-level page tables as background:
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https://lwn.net/Articles/717293/
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Thanks: Laszlo Ersek
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Fixes: https://answers.launchpad.net/ubuntu/+source/libguestfs/+question/701625
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Acked-by: Laszlo Ersek <lersek@redhat.com>
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(cherry picked from commit 59d7e6e017b7de79bcb60e1180e15303f1e7dae8)
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---
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lib/launch-direct.c | 15 +++++++++++++--
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lib/launch-libvirt.c | 7 +++++++
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2 files changed, 20 insertions(+), 2 deletions(-)
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diff --git a/lib/launch-direct.c b/lib/launch-direct.c
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index 4f038f4f0..e7c22fbef 100644
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--- a/lib/launch-direct.c
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+++ b/lib/launch-direct.c
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@@ -554,8 +554,19 @@ launch_direct (guestfs_h *g, void *datav, const char *arg)
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} end_list ();
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cpu_model = guestfs_int_get_cpu_model (has_kvm && !force_tcg);
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- if (cpu_model)
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- arg ("-cpu", cpu_model);
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+ if (cpu_model) {
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+#if defined(__x86_64__)
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+ /* Temporary workaround for RHBZ#2082806 */
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+ if (STREQ (cpu_model, "max")) {
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+ start_list ("-cpu") {
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+ append_list (cpu_model);
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+ append_list ("la57=off");
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+ } end_list ();
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+ }
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+ else
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+#endif
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+ arg ("-cpu", cpu_model);
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+ }
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if (g->smp > 1)
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arg_format ("-smp", "%d", g->smp);
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diff --git a/lib/launch-libvirt.c b/lib/launch-libvirt.c
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index cc714c02e..9e32c94cf 100644
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--- a/lib/launch-libvirt.c
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+++ b/lib/launch-libvirt.c
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@@ -1185,6 +1185,13 @@ construct_libvirt_xml_cpu (guestfs_h *g,
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else if (STREQ (cpu_model, "max")) {
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/* https://bugzilla.redhat.com/show_bug.cgi?id=1935572#c11 */
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attribute ("mode", "maximum");
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+#if defined(__x86_64__)
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+ /* Temporary workaround for RHBZ#2082806 */
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+ start_element ("feature") {
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+ attribute ("policy", "disable");
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+ attribute ("name", "la57");
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+ } end_element ();
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+#endif
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}
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else
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single_element ("model", cpu_model);
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--
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2.31.1
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@ -57,7 +57,7 @@ Summary: Access and modify virtual machine disk images
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Name: libguestfs
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Epoch: 1
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Version: 1.46.1
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Release: 3%{?dist}
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Release: 4%{?dist}
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License: LGPLv2+
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# Build only for architectures that have a kernel
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@ -108,6 +108,7 @@ Patch0010: 0010-RHEL-Remove-User-Mode-Linux-RHBZ-1144197.patch
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Patch0011: 0011-RHEL-Reject-use-of-libguestfs-winsupport-features-ex.patch
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Patch0012: 0012-RHEL-Create-etc-crypto-policies-back-ends-opensslcnf.patch
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Patch0013: 0013-daemon-rpm-c.c-Disable-signature-checking-in-librpm.patch
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Patch0014: 0014-lib-Disable-5-level-page-tables-when-using-cpu-max.patch
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%if 0%{patches_touch_autotools}
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BuildRequires: autoconf, automake, libtool, gettext-devel
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@ -1147,6 +1148,10 @@ rm ocaml/html/.gitignore
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%changelog
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* Sun May 15 2022 Richard W.M. Jones <rjones@redhat.com> - 1:1.46.1-4
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- Disable 5-level page tables when using -cpu max
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resolves: rhbz#2085527
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* Thu Mar 17 2022 Richard W.M. Jones <rjones@redhat.com> - 1:1.46.1-3
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- Disable signature checking in librpm
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resolves: rhbz#2064182
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