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From 466322847847d3948eb7699aafcf9afd9ac3fc26 Mon Sep 17 00:00:00 2001
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From: David Gibson <dgibson@redhat.com>
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Date: Fri, 19 Jan 2018 02:34:36 +0100
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Subject: [PATCH 08/21] spapr: Capabilities infrastructure
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RH-Author: David Gibson <dgibson@redhat.com>
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Message-id: <20180119023442.28577-2-dgibson@redhat.com>
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Patchwork-id: 78668
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O-Subject: [RHEL-7.5 qemu-kvm-rhev PATCH 1/7] spapr: Capabilities infrastructure
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Bugzilla: 1523414
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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: David Gibson <david@gibson.dropbear.id.au>
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Because PAPR is a paravirtual environment access to certain CPU (or other)
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facilities can be blocked by the hypervisor. PAPR provides ways to
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advertise in the device tree whether or not those features are available to
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the guest.
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In some places we automatically determine whether to make a feature
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available based on whether our host can support it, in most cases this is
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based on limitations in the available KVM implementation.
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Although we correctly advertise this to the guest, it means that host
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factors might make changes to the guest visible environment which is bad:
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as well as generaly reducing reproducibility, it means that a migration
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between different host environments can easily go bad.
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We've mostly gotten away with it because the environments considered mature
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enough to be well supported (basically, KVM on POWER8) have had consistent
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feature availability. But, it's still not right and some limitations on
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POWER9 is going to make it more of an issue in future.
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This introduces an infrastructure for defining "sPAPR capabilities". These
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are set by default based on the machine version, masked by the capabilities
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of the chosen cpu, but can be overriden with machine properties.
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The intention is at reset time we verify that the requested capabilities
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can be supported on the host (considering TCG, KVM and/or host cpu
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limitations). If not we simply fail, rather than silently modifying the
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advertised featureset to the guest.
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This does mean that certain configurations that "worked" may now fail, but
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such configurations were already more subtly broken.
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Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
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Reviewed-by: Greg Kurz <groug@kaod.org>
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(cherry picked from commit 33face6b8981add8eba1f7cdaf4cf6cede415d2e)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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Conflicts:
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hw/ppc/spapr.c
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include/hw/ppc/spapr.h
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Simple contextual conflicts.
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1523414
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Signed-off-by: David Gibson <dgibson@redhat.com>
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---
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hw/ppc/Makefile.objs | 2 +-
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hw/ppc/spapr.c | 7 ++
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hw/ppc/spapr_caps.c | 181 +++++++++++++++++++++++++++++++++++++++++++++++++
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include/hw/ppc/spapr.h | 31 +++++++++
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4 files changed, 220 insertions(+), 1 deletion(-)
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create mode 100644 hw/ppc/spapr_caps.c
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diff --git a/hw/ppc/Makefile.objs b/hw/ppc/Makefile.objs
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index 856cef5..d4cdbb8 100644
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--- a/hw/ppc/Makefile.objs
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+++ b/hw/ppc/Makefile.objs
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@@ -1,7 +1,7 @@
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# shared objects
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obj-y += ppc.o ppc_booke.o fdt.o
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# IBM pSeries (sPAPR)
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-obj-$(CONFIG_PSERIES) += spapr.o spapr_vio.o spapr_events.o
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+obj-$(CONFIG_PSERIES) += spapr.o spapr_caps.o spapr_vio.o spapr_events.o
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obj-$(CONFIG_PSERIES) += spapr_hcall.o spapr_iommu.o spapr_rtas.o
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obj-$(CONFIG_PSERIES) += spapr_pci.o spapr_rtc.o spapr_drc.o
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obj-$(CONFIG_PSERIES) += spapr_cpu_core.o spapr_ovec.o
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diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
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index cdc56f3..7a4191d 100644
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--- a/hw/ppc/spapr.c
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+++ b/hw/ppc/spapr.c
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@@ -1424,6 +1424,8 @@ static void ppc_spapr_reset(void)
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/* Check for unknown sysbus devices */
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foreach_dynamic_sysbus_device(find_unknown_sysbus_device, NULL);
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+ spapr_caps_reset(spapr);
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+
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first_ppc_cpu = POWERPC_CPU(first_cpu);
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if (kvm_enabled() && kvmppc_has_cap_mmu_radix() &&
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ppc_check_compat(first_ppc_cpu, CPU_POWERPC_LOGICAL_3_00, 0,
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@@ -2267,6 +2269,8 @@ static void ppc_spapr_init(MachineState *machine)
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char *filename;
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Error *resize_hpt_err = NULL;
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+ spapr_caps_validate(spapr, &error_fatal);
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+
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msi_nonbroken = true;
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QLIST_INIT(&spapr->phbs);
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@@ -3635,6 +3639,9 @@ static void spapr_machine_class_init(ObjectClass *oc, void *data)
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*/
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mc->numa_mem_align_shift = 28;
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smc->has_power9_support = true;
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+
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+ smc->default_caps = spapr_caps(0);
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+ spapr_caps_add_properties(smc, &error_abort);
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}
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static const TypeInfo spapr_machine_info = {
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diff --git a/hw/ppc/spapr_caps.c b/hw/ppc/spapr_caps.c
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new file mode 100644
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index 0000000..968ba7b
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--- /dev/null
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+++ b/hw/ppc/spapr_caps.c
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@@ -0,0 +1,181 @@
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+/*
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+ * QEMU PowerPC pSeries Logical Partition capabilities handling
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+ *
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+ * Copyright (c) 2017 David Gibson, Red Hat Inc.
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+ *
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+ * Permission is hereby granted, free of charge, to any person obtaining a copy
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+ * of this software and associated documentation files (the "Software"), to deal
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+ * in the Software without restriction, including without limitation the rights
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+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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+ * copies of the Software, and to permit persons to whom the Software is
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+ * furnished to do so, subject to the following conditions:
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+ *
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+ * The above copyright notice and this permission notice shall be included in
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+ * all copies or substantial portions of the Software.
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+ *
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+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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+ * THE SOFTWARE.
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+ */
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+#include "qemu/osdep.h"
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+#include "qapi/error.h"
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+#include "qapi/visitor.h"
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+
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+#include "hw/ppc/spapr.h"
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+
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+typedef struct sPAPRCapabilityInfo {
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+ const char *name;
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+ const char *description;
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+ uint64_t flag;
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+
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+ /* Make sure the virtual hardware can support this capability */
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+ void (*allow)(sPAPRMachineState *spapr, Error **errp);
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+
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+ /* If possible, tell the virtual hardware not to allow the cap to
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+ * be used at all */
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+ void (*disallow)(sPAPRMachineState *spapr, Error **errp);
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+} sPAPRCapabilityInfo;
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+
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+static sPAPRCapabilityInfo capability_table[] = {
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+};
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+
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+static sPAPRCapabilities default_caps_with_cpu(sPAPRMachineState *spapr,
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+ CPUState *cs)
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+{
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+ sPAPRMachineClass *smc = SPAPR_MACHINE_GET_CLASS(spapr);
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+ sPAPRCapabilities caps;
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+
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+ caps = smc->default_caps;
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+
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+ /* TODO: clamp according to cpu model */
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+
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+ return caps;
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+}
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+
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+void spapr_caps_reset(sPAPRMachineState *spapr)
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+{
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+ Error *local_err = NULL;
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+ sPAPRCapabilities caps;
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+ int i;
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+
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+ /* First compute the actual set of caps we're running with.. */
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+ caps = default_caps_with_cpu(spapr, first_cpu);
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+
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+ caps.mask |= spapr->forced_caps.mask;
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+ caps.mask &= ~spapr->forbidden_caps.mask;
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+
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+ spapr->effective_caps = caps;
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+
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+ /* .. then apply those caps to the virtual hardware */
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+
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+ for (i = 0; i < ARRAY_SIZE(capability_table); i++) {
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+ sPAPRCapabilityInfo *info = &capability_table[i];
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+
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+ if (spapr->effective_caps.mask & info->flag) {
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+ /* Failure to allow a cap is fatal - if the guest doesn't
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+ * have it, we'll be supplying an incorrect environment */
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+ if (info->allow) {
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+ info->allow(spapr, &error_fatal);
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+ }
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+ } else {
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+ /* Failure to enforce a cap is only a warning. The guest
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+ * shouldn't be using it, since it's not advertised, so it
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+ * doesn't get to complain about weird behaviour if it
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+ * goes ahead anyway */
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+ if (info->disallow) {
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+ info->disallow(spapr, &local_err);
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+ }
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+ if (local_err) {
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+ warn_report_err(local_err);
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+ local_err = NULL;
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+ }
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+ }
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+ }
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+}
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+
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+static void spapr_cap_get(Object *obj, Visitor *v, const char *name,
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+ void *opaque, Error **errp)
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+{
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+ sPAPRCapabilityInfo *cap = opaque;
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+ sPAPRMachineState *spapr = SPAPR_MACHINE(obj);
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+ bool value = spapr_has_cap(spapr, cap->flag);
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+
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+ /* TODO: Could this get called before effective_caps is finalized
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+ * in spapr_caps_reset()? */
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+
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+ visit_type_bool(v, name, &value, errp);
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+}
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+
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+static void spapr_cap_set(Object *obj, Visitor *v, const char *name,
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+ void *opaque, Error **errp)
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+{
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+ sPAPRCapabilityInfo *cap = opaque;
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+ sPAPRMachineState *spapr = SPAPR_MACHINE(obj);
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+ bool value;
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+ Error *local_err = NULL;
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+
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+ visit_type_bool(v, name, &value, &local_err);
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+ if (local_err) {
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+ error_propagate(errp, local_err);
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+ return;
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+ }
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+
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+ if (value) {
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+ spapr->forced_caps.mask |= cap->flag;
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+ } else {
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+ spapr->forbidden_caps.mask |= cap->flag;
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+ }
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+}
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+
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+void spapr_caps_validate(sPAPRMachineState *spapr, Error **errp)
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+{
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+ uint64_t allcaps = 0;
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+ int i;
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+
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+ for (i = 0; i < ARRAY_SIZE(capability_table); i++) {
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+ g_assert((allcaps & capability_table[i].flag) == 0);
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+ allcaps |= capability_table[i].flag;
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+ }
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+
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+ g_assert((spapr->forced_caps.mask & ~allcaps) == 0);
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+ g_assert((spapr->forbidden_caps.mask & ~allcaps) == 0);
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+
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+ if (spapr->forced_caps.mask & spapr->forbidden_caps.mask) {
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+ error_setg(errp, "Some sPAPR capabilities set both on and off");
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+ return;
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+ }
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+
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+ /* Check for any caps incompatible with other caps. Nothing to do
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+ * yet */
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4a2fec |
+}
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4a2fec |
+
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4a2fec |
+void spapr_caps_add_properties(sPAPRMachineClass *smc, Error **errp)
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4a2fec |
+{
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4a2fec |
+ Error *local_err = NULL;
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4a2fec |
+ ObjectClass *klass = OBJECT_CLASS(smc);
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4a2fec |
+ int i;
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4a2fec |
+
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4a2fec |
+ for (i = 0; i < ARRAY_SIZE(capability_table); i++) {
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4a2fec |
+ sPAPRCapabilityInfo *cap = &capability_table[i];
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4a2fec |
+ const char *name = g_strdup_printf("cap-%s", cap->name);
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4a2fec |
+
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4a2fec |
+ object_class_property_add(klass, name, "bool",
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4a2fec |
+ spapr_cap_get, spapr_cap_set, NULL,
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4a2fec |
+ cap, &local_err);
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4a2fec |
+ if (local_err) {
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4a2fec |
+ error_propagate(errp, local_err);
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4a2fec |
+ return;
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4a2fec |
+ }
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4a2fec |
+
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4a2fec |
+ object_class_property_set_description(klass, name, cap->description,
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4a2fec |
+ &local_err);
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4a2fec |
+ if (local_err) {
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4a2fec |
+ error_propagate(errp, local_err);
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4a2fec |
+ return;
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4a2fec |
+ }
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4a2fec |
+ }
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4a2fec |
+}
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4a2fec |
diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
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4a2fec |
index d9e8e5a..7267151 100644
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4a2fec |
--- a/include/hw/ppc/spapr.h
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4a2fec |
+++ b/include/hw/ppc/spapr.h
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4a2fec |
@@ -51,6 +51,15 @@ typedef enum {
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4a2fec |
} sPAPRResizeHPT;
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4a2fec |
|
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4a2fec |
/**
|
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4a2fec |
+ * Capabilities
|
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4a2fec |
+ */
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4a2fec |
+
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4a2fec |
+typedef struct sPAPRCapabilities sPAPRCapabilities;
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4a2fec |
+struct sPAPRCapabilities {
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4a2fec |
+ uint64_t mask;
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4a2fec |
+};
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4a2fec |
+
|
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4a2fec |
+/**
|
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|
4a2fec |
* sPAPRMachineClass:
|
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|
4a2fec |
*/
|
|
|
4a2fec |
struct sPAPRMachineClass {
|
|
|
4a2fec |
@@ -68,6 +77,7 @@ struct sPAPRMachineClass {
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|
4a2fec |
hwaddr *mmio32, hwaddr *mmio64,
|
|
|
4a2fec |
unsigned n_dma, uint32_t *liobns, Error **errp);
|
|
|
4a2fec |
sPAPRResizeHPT resize_hpt_default;
|
|
|
4a2fec |
+ sPAPRCapabilities default_caps;
|
|
|
4a2fec |
};
|
|
|
4a2fec |
|
|
|
4a2fec |
/**
|
|
|
4a2fec |
@@ -129,6 +139,9 @@ struct sPAPRMachineState {
|
|
|
4a2fec |
MemoryHotplugState hotplug_memory;
|
|
|
4a2fec |
|
|
|
4a2fec |
const char *icp_type;
|
|
|
4a2fec |
+
|
|
|
4a2fec |
+ sPAPRCapabilities forced_caps, forbidden_caps;
|
|
|
4a2fec |
+ sPAPRCapabilities effective_caps;
|
|
|
4a2fec |
};
|
|
|
4a2fec |
|
|
|
4a2fec |
#define H_SUCCESS 0
|
|
|
4a2fec |
@@ -707,4 +720,22 @@ void spapr_do_system_reset_on_cpu(CPUState *cs, run_on_cpu_data arg);
|
|
|
4a2fec |
|
|
|
4a2fec |
#define HTAB_SIZE(spapr) (1ULL << ((spapr)->htab_shift))
|
|
|
4a2fec |
|
|
|
4a2fec |
+/*
|
|
|
4a2fec |
+ * Handling of optional capabilities
|
|
|
4a2fec |
+ */
|
|
|
4a2fec |
+static inline sPAPRCapabilities spapr_caps(uint64_t mask)
|
|
|
4a2fec |
+{
|
|
|
4a2fec |
+ sPAPRCapabilities caps = { mask };
|
|
|
4a2fec |
+ return caps;
|
|
|
4a2fec |
+}
|
|
|
4a2fec |
+
|
|
|
4a2fec |
+static inline bool spapr_has_cap(sPAPRMachineState *spapr, uint64_t cap)
|
|
|
4a2fec |
+{
|
|
|
4a2fec |
+ return !!(spapr->effective_caps.mask & cap);
|
|
|
4a2fec |
+}
|
|
|
4a2fec |
+
|
|
|
4a2fec |
+void spapr_caps_reset(sPAPRMachineState *spapr);
|
|
|
4a2fec |
+void spapr_caps_validate(sPAPRMachineState *spapr, Error **errp);
|
|
|
4a2fec |
+void spapr_caps_add_properties(sPAPRMachineClass *smc, Error **errp);
|
|
|
4a2fec |
+
|
|
|
4a2fec |
#endif /* HW_SPAPR_H */
|
|
|
4a2fec |
--
|
|
|
4a2fec |
1.8.3.1
|
|
|
4a2fec |
|