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From bc0dcb3a78edf2eb8df0509d4862bb9ff36c4332 Mon Sep 17 00:00:00 2001
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From: David Gibson <dgibson@redhat.com>
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Date: Wed, 4 Oct 2017 05:40:14 +0200
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Subject: [PATCH 07/34] spapr: fix CAS-generated reset
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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: David Gibson <dgibson@redhat.com>
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Message-id: <20171004054014.14159-5-dgibson@redhat.com>
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Patchwork-id: 76802
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O-Subject: [RHEL-7.5 qemu-kvm-rhev PATCH 4/4] spapr: fix CAS-generated reset
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Bugzilla: 1448344
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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From: Cédric Le Goater <clg@kaod.org>
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The OV5_MMU_RADIX_300 requires special handling in the CAS negotiation
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process. It is cleared from the option vector of the guest before
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evaluating the changes and re-added later. But, when testing for a
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possible CAS reset :
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spapr->cas_reboot = spapr_ovec_diff(ov5_updates,
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ov5_cas_old, spapr->ov5_cas);
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the bit OV5_MMU_RADIX_300 will each time be seen as removed from the
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previous OV5 set, hence generating a reset loop.
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Fix this problem by also clearing the same bit in the ov5_cas_old set.
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Signed-off-by: Cédric Le Goater <clg@kaod.org>
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Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
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(cherry picked from commit 30bf9ed1684da582e47ae004f8f3cf14fd6f39dd)
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Signed-off-by: David Gibson <dgibson@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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hw/ppc/spapr_hcall.c | 7 +++++++
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1 file changed, 7 insertions(+)
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diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c
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index 07b3da8..92f1e21 100644
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--- a/hw/ppc/spapr_hcall.c
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+++ b/hw/ppc/spapr_hcall.c
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@@ -1575,6 +1575,13 @@ static target_ulong h_client_architecture_support(PowerPCCPU *cpu,
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* to worry about this for now.
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*/
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ov5_cas_old = spapr_ovec_clone(spapr->ov5_cas);
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+
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+ /* also clear the radix/hash bit from the current ov5_cas bits to
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+ * be in sync with the newly ov5 bits. Else the radix bit will be
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+ * seen as being removed and this will generate a reset loop
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+ */
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+ spapr_ovec_clear(ov5_cas_old, OV5_MMU_RADIX_300);
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+
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/* full range of negotiated ov5 capabilities */
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spapr_ovec_intersect(spapr->ov5_cas, spapr->ov5, ov5_guest);
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spapr_ovec_cleanup(ov5_guest);
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--
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1.8.3.1
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