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From 92bb62c47eab021f8dabecd09b5fbc1706e6a29c Mon Sep 17 00:00:00 2001
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From: David Gibson <dgibson@redhat.com>
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Date: Wed, 6 Feb 2019 03:58:56 +0000
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Subject: BZ1653590: Require at least 64kiB pages for downstream guests & hosts
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RH-Author: David Gibson <dgibson@redhat.com>
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Message-id: <20190206035856.19058-1-dgibson@redhat.com>
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Patchwork-id: 84246
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O-Subject: [RHELAV-8.0/rhel qemu-kvm PATCH] BZ1653590: Require at least 64kiB pages for downstream guests & hosts
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Bugzilla: 1653590
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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RH-Acked-by: Serhii Popovych <spopovyc@redhat.com>
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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Most current POWER guests require 64kiB page support, so that's the default
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for the cap-hpt-max-pagesize option in qemu which limits available guest
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page sizes. We warn if the value is set smaller than that, but don't
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outright fail upstream, because we need to allow for the possibility of
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guest (and/or host) kernels configured for 4kiB page sizes.
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Downstream, however, we simply don't support 4kiB pagesize configured
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kernels in guest or host, so we can have qemu simply error out in this
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situation.
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Testing: Attempted to start a guest with cap-hpt-max-page-size=4k and verified
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it failed immediately with a qemu error
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Signed-off-by: David Gibson <dgibson@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/ppc/spapr_caps.c | 7 +++++++
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1 file changed, 7 insertions(+)
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diff --git a/hw/ppc/spapr_caps.c b/hw/ppc/spapr_caps.c
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index ed7c077a0d..48a8efe678 100644
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--- a/hw/ppc/spapr_caps.c
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+++ b/hw/ppc/spapr_caps.c
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@@ -332,12 +332,19 @@ bool spapr_check_pagesize(SpaprMachineState *spapr, hwaddr pagesize,
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static void cap_hpt_maxpagesize_apply(SpaprMachineState *spapr,
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uint8_t val, Error **errp)
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{
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+#if 0 /* disabled for RHEL */
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if (val < 12) {
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error_setg(errp, "Require at least 4kiB hpt-max-page-size");
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return;
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} else if (val < 16) {
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warn_report("Many guests require at least 64kiB hpt-max-page-size");
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}
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+#else /* Only page sizes >=64kiB supported for RHEL */
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+ if (val < 16) {
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+ error_setg(errp, "Require at least 64kiB hpt-max-page-size");
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+ return;
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+ }
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+#endif
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spapr_check_pagesize(spapr, qemu_minrampagesize(), errp);
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}
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--
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2.27.0
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