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From d2629755385917d277b80267cb88436c950123a7 Mon Sep 17 00:00:00 2001
From: Igor Mammedov <imammedo@redhat.com>
Date: Fri, 28 Aug 2020 16:23:49 -0400
Subject: [PATCH 07/11] Revert "hw/386: Add EPYC mode topology decoding
functions"
RH-Author: Igor Mammedov <imammedo@redhat.com>
Message-id: <20200828162349.1616028-8-imammedo@redhat.com>
Patchwork-id: 98250
O-Subject: [RHEL-AV 8.3.0 qemu-kvm PATCH 7/7] Revert "hw/386: Add EPYC mode topology decoding functions"
Bugzilla: 1873417
RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
RH-Acked-by: Eduardo Habkost <ehabkost@redhat.com>
RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1873417
Brew: http://brewweb.devel.redhat.com/brew/taskinfo?taskID=31005031
Branch: rhel-av-8.3.0
Upstream: RHEL only
Tested: locally
A regression was introduced since qemu-5.0, when EPYC specific
APIC ID encoding was introduced. Which leads to migration failing
with:
"
: Unknown savevm section or instance 'apic' 4. Make sure that your current VM setup matches your saved VM setup, including any hotplugged devices
: load of migration failed: Invalid argument
"
when EPYC cpu model and more than 1 numa node is used.
EPYC specific APIC ID encoding is considered as failed
experiment and upstream is preparing to revert it as well.
This reverts commit 7568b205555a6405042f62c64af3268f4330aed5.
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
---
include/hw/i386/topology.h | 100 -------------------------------------
1 file changed, 100 deletions(-)
diff --git a/include/hw/i386/topology.h b/include/hw/i386/topology.h
index 07239f95f4..b9593b9905 100644
--- a/include/hw/i386/topology.h
+++ b/include/hw/i386/topology.h
@@ -47,7 +47,6 @@ typedef uint32_t apic_id_t;
typedef struct X86CPUTopoIDs {
unsigned pkg_id;
- unsigned node_id;
unsigned die_id;
unsigned core_id;
unsigned smt_id;
@@ -89,11 +88,6 @@ static inline unsigned apicid_die_width(X86CPUTopoInfo *topo_info)
return apicid_bitwidth_for_count(topo_info->dies_per_pkg);
}
-/* Bit width of the node_id field per socket */
-static inline unsigned apicid_node_width_epyc(X86CPUTopoInfo *topo_info)
-{
- return apicid_bitwidth_for_count(MAX(topo_info->nodes_per_pkg, 1));
-}
/* Bit offset of the Core_ID field
*/
static inline unsigned apicid_core_offset(X86CPUTopoInfo *topo_info)
@@ -114,100 +108,6 @@ static inline unsigned apicid_pkg_offset(X86CPUTopoInfo *topo_info)
return apicid_die_offset(topo_info) + apicid_die_width(topo_info);
}
-#define NODE_ID_OFFSET 3 /* Minimum node_id offset if numa configured */
-
-/*
- * Bit offset of the node_id field
- *
- * Make sure nodes_per_pkg > 0 if numa configured else zero.
- */
-static inline unsigned apicid_node_offset_epyc(X86CPUTopoInfo *topo_info)
-{
- unsigned offset = apicid_die_offset(topo_info) +
- apicid_die_width(topo_info);
-
- if (topo_info->nodes_per_pkg) {
- return MAX(NODE_ID_OFFSET, offset);
- } else {
- return offset;
- }
-}
-
-/* Bit offset of the Pkg_ID (socket ID) field */
-static inline unsigned apicid_pkg_offset_epyc(X86CPUTopoInfo *topo_info)
-{
- return apicid_node_offset_epyc(topo_info) +
- apicid_node_width_epyc(topo_info);
-}
-
-/*
- * Make APIC ID for the CPU based on Pkg_ID, Core_ID, SMT_ID
- *
- * The caller must make sure core_id < nr_cores and smt_id < nr_threads.
- */
-static inline apic_id_t
-x86_apicid_from_topo_ids_epyc(X86CPUTopoInfo *topo_info,
- const X86CPUTopoIDs *topo_ids)
-{
- return (topo_ids->pkg_id << apicid_pkg_offset_epyc(topo_info)) |
- (topo_ids->node_id << apicid_node_offset_epyc(topo_info)) |
- (topo_ids->die_id << apicid_die_offset(topo_info)) |
- (topo_ids->core_id << apicid_core_offset(topo_info)) |
- topo_ids->smt_id;
-}
-
-static inline void x86_topo_ids_from_idx_epyc(X86CPUTopoInfo *topo_info,
- unsigned cpu_index,
- X86CPUTopoIDs *topo_ids)
-{
- unsigned nr_nodes = MAX(topo_info->nodes_per_pkg, 1);
- unsigned nr_dies = topo_info->dies_per_pkg;
- unsigned nr_cores = topo_info->cores_per_die;
- unsigned nr_threads = topo_info->threads_per_core;
- unsigned cores_per_node = DIV_ROUND_UP((nr_dies * nr_cores * nr_threads),
- nr_nodes);
-
- topo_ids->pkg_id = cpu_index / (nr_dies * nr_cores * nr_threads);
- topo_ids->node_id = (cpu_index / cores_per_node) % nr_nodes;
- topo_ids->die_id = cpu_index / (nr_cores * nr_threads) % nr_dies;
- topo_ids->core_id = cpu_index / nr_threads % nr_cores;
- topo_ids->smt_id = cpu_index % nr_threads;
-}
-
-/*
- * Calculate thread/core/package IDs for a specific topology,
- * based on APIC ID
- */
-static inline void x86_topo_ids_from_apicid_epyc(apic_id_t apicid,
- X86CPUTopoInfo *topo_info,
- X86CPUTopoIDs *topo_ids)
-{
- topo_ids->smt_id = apicid &
- ~(0xFFFFFFFFUL << apicid_smt_width(topo_info));
- topo_ids->core_id =
- (apicid >> apicid_core_offset(topo_info)) &
- ~(0xFFFFFFFFUL << apicid_core_width(topo_info));
- topo_ids->die_id =
- (apicid >> apicid_die_offset(topo_info)) &
- ~(0xFFFFFFFFUL << apicid_die_width(topo_info));
- topo_ids->node_id =
- (apicid >> apicid_node_offset_epyc(topo_info)) &
- ~(0xFFFFFFFFUL << apicid_node_width_epyc(topo_info));
- topo_ids->pkg_id = apicid >> apicid_pkg_offset_epyc(topo_info);
-}
-
-/*
- * Make APIC ID for the CPU 'cpu_index'
- *
- * 'cpu_index' is a sequential, contiguous ID for the CPU.
- */
-static inline apic_id_t x86_apicid_from_cpu_idx_epyc(X86CPUTopoInfo *topo_info,
- unsigned cpu_index)
-{
- X86CPUTopoIDs topo_ids;
- x86_topo_ids_from_idx_epyc(topo_info, cpu_index, &topo_ids);
- return x86_apicid_from_topo_ids_epyc(topo_info, &topo_ids);
-}
/* Make APIC ID for the CPU based on Pkg_ID, Core_ID, SMT_ID
*
* The caller must make sure core_id < nr_cores and smt_id < nr_threads.
--
2.27.0
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