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x86 queue, 2020-09-18

Browse Source 
Cleanups:
 * Correct the meaning of '0xffffffff' value for hv-spinlocks (Vitaly Kuznetsov)
 * vmport: Drop superfluous parenthesis (Philippe Mathieu-Daudé)
 
 Fixes:
 * Use generic APIC ID encoding code for EPYC (Babu Moger)
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Merge remote-tracking branch 'remotes/ehabkost/tags/x86-next-pull-request' into staging

x86 queue, 2020-09-18

Cleanups:
* Correct the meaning of '0xffffffff' value for hv-spinlocks (Vitaly Kuznetsov)
* vmport: Drop superfluous parenthesis (Philippe Mathieu-Daudé)

Fixes:
* Use generic APIC ID encoding code for EPYC (Babu Moger)

# gpg: Signature made Fri 18 Sep 2020 21:26:57 BST
# gpg:                using RSA key 5A322FD5ABC4D3DBACCFD1AA2807936F984DC5A6
# gpg:                issuer "ehabkost@redhat.com"
# gpg: Good signature from "Eduardo Habkost <ehabkost@redhat.com>" [full]
# Primary key fingerprint: 5A32 2FD5 ABC4 D3DB ACCF  D1AA 2807 936F 984D C5A6

* remotes/ehabkost/tags/x86-next-pull-request:
  i386: Simplify CPUID_8000_001E for AMD
  i386: Simplify CPUID_8000_001d for AMD
  hw/i386/vmport: Drop superfluous parenthesis around function typedef
  i386/kvm: correct the meaning of '0xffffffff' value for hv-spinlocks

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2020-09-21 17:41:32 +01:00
commit 5df6c87e80
5 changed files with 68 additions and 172 deletions
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2
docs/hyperv.txt
View File

@ -49,7 +49,7 @@ more efficiently. In particular, this enlightenment allows paravirtualized
======================
Enables paravirtualized spinlocks. The parameter indicates how many times
spinlock acquisition should be attempted before indicating the situation to the
hypervisor. A special value 0xffffffff indicates "never to retry".
hypervisor. A special value 0xffffffff indicates "never notify".
3.4. hv-vpindex
================

2
include/hw/i386/vmport.h
View File

@ -4,7 +4,7 @@
#include "hw/isa/isa.h"
#define TYPE_VMPORT "vmport"
typedef uint32_t (VMPortReadFunc)(void *opaque, uint32_t address);
typedef uint32_t VMPortReadFunc(void *opaque, uint32_t address);
typedef enum {
VMPORT_CMD_GETVERSION = 10,

228
target/i386/cpu.c
View File

@ -338,68 +338,13 @@ static void encode_cache_cpuid80000006(CPUCacheInfo *l2,
}
}
/*
* Definitions used for building CPUID Leaf 0x8000001D and 0x8000001E
* Please refer to the AMD64 Architecture Programmer’s Manual Volume 3.
* Define the constants to build the cpu topology. Right now, TOPOEXT
* feature is enabled only on EPYC. So, these constants are based on
* EPYC supported configurations. We may need to handle the cases if
* these values change in future.
*/
/* Maximum core complexes in a node */
#define MAX_CCX 2
/* Maximum cores in a core complex */
#define MAX_CORES_IN_CCX 4
/* Maximum cores in a node */
#define MAX_CORES_IN_NODE 8
/* Maximum nodes in a socket */
#define MAX_NODES_PER_SOCKET 4
/*
* Figure out the number of nodes required to build this config.
* Max cores in a node is 8
*/
static int nodes_in_socket(int nr_cores)
{
int nodes;
nodes = DIV_ROUND_UP(nr_cores, MAX_CORES_IN_NODE);
/* Hardware does not support config with 3 nodes, return 4 in that case */
return (nodes == 3) ? 4 : nodes;
}
/*
* Decide the number of cores in a core complex with the given nr_cores using
* following set constants MAX_CCX, MAX_CORES_IN_CCX, MAX_CORES_IN_NODE and
* MAX_NODES_PER_SOCKET. Maintain symmetry as much as possible
* L3 cache is shared across all cores in a core complex. So, this will also
* tell us how many cores are sharing the L3 cache.
*/
static int cores_in_core_complex(int nr_cores)
{
int nodes;
/* Check if we can fit all the cores in one core complex */
if (nr_cores <= MAX_CORES_IN_CCX) {
return nr_cores;
}
/* Get the number of nodes required to build this config */
nodes = nodes_in_socket(nr_cores);
/*
* Divide the cores accros all the core complexes
* Return rounded up value
*/
return DIV_ROUND_UP(nr_cores, nodes * MAX_CCX);
}
/* Encode cache info for CPUID[8000001D] */
static void encode_cache_cpuid8000001d(CPUCacheInfo *cache, CPUState *cs,
uint32_t *eax, uint32_t *ebx,
uint32_t *ecx, uint32_t *edx)
static void encode_cache_cpuid8000001d(CPUCacheInfo *cache,
X86CPUTopoInfo *topo_info,
uint32_t *eax, uint32_t *ebx,
uint32_t *ecx, uint32_t *edx)
{
uint32_t l3_cores;
uint32_t l3_threads;
assert(cache->size == cache->line_size * cache->associativity *
cache->partitions * cache->sets);
@ -408,10 +353,10 @@ static void encode_cache_cpuid8000001d(CPUCacheInfo *cache, CPUState *cs,
/* L3 is shared among multiple cores */
if (cache->level == 3) {
l3_cores = cores_in_core_complex(cs->nr_cores);
*eax |= ((l3_cores * cs->nr_threads) - 1) << 14;
l3_threads = topo_info->cores_per_die * topo_info->threads_per_core;
*eax |= (l3_threads - 1) << 14;
} else {
*eax |= ((cs->nr_threads - 1) << 14);
*eax |= ((topo_info->threads_per_core - 1) << 14);
}
assert(cache->line_size > 0);
@ -431,107 +376,58 @@ static void encode_cache_cpuid8000001d(CPUCacheInfo *cache, CPUState *cs,
(cache->complex_indexing ? CACHE_COMPLEX_IDX : 0);
}
/* Data structure to hold the configuration info for a given core index */
struct core_topology {
/* core complex id of the current core index */
int ccx_id;
/*
* Adjusted core index for this core in the topology
* This can be 0,1,2,3 with max 4 cores in a core complex
*/
int core_id;
/* Node id for this core index */
int node_id;
/* Number of nodes in this config */
int num_nodes;
};
/*
* Build the configuration closely match the EPYC hardware. Using the EPYC
* hardware configuration values (MAX_CCX, MAX_CORES_IN_CCX, MAX_CORES_IN_NODE)
* right now. This could change in future.
* nr_cores : Total number of cores in the config
* core_id : Core index of the current CPU
* topo : Data structure to hold all the config info for this core index
*/
static void build_core_topology(int nr_cores, int core_id,
struct core_topology *topo)
{
int nodes, cores_in_ccx;
/* First get the number of nodes required */
nodes = nodes_in_socket(nr_cores);
cores_in_ccx = cores_in_core_complex(nr_cores);
topo->node_id = core_id / (cores_in_ccx * MAX_CCX);
topo->ccx_id = (core_id % (cores_in_ccx * MAX_CCX)) / cores_in_ccx;
topo->core_id = core_id % cores_in_ccx;
topo->num_nodes = nodes;
}
/* Encode cache info for CPUID[8000001E] */
static void encode_topo_cpuid8000001e(CPUState *cs, X86CPU *cpu,
uint32_t *eax, uint32_t *ebx,
uint32_t *ecx, uint32_t *edx)
static void encode_topo_cpuid8000001e(X86CPU *cpu, X86CPUTopoInfo *topo_info,
uint32_t *eax, uint32_t *ebx,
uint32_t *ecx, uint32_t *edx)
{
struct core_topology topo = {0};
unsigned long nodes;
int shift;
X86CPUTopoIDs topo_ids;
x86_topo_ids_from_apicid(cpu->apic_id, topo_info, &topo_ids);
build_core_topology(cs->nr_cores, cpu->core_id, &topo);
*eax = cpu->apic_id;
/*
* CPUID_Fn8000001E_EBX
* 31:16 Reserved
* 15:8 Threads per core (The number of threads per core is
* Threads per core + 1)
* 7:0 Core id (see bit decoding below)
* SMT:
* 4:3 node id
* 2 Core complex id
* 1:0 Core id
* Non SMT:
* 5:4 node id
* 3 Core complex id
* 1:0 Core id
* CPUID_Fn8000001E_EBX [Core Identifiers] (CoreId)
* Read-only. Reset: 0000_XXXXh.
* See Core::X86::Cpuid::ExtApicId.
* Core::X86::Cpuid::CoreId_lthree[1:0]_core[3:0]_thread[1:0];
* Bits Description
* 31:16 Reserved.
* 15:8 ThreadsPerCore: threads per core. Read-only. Reset: XXh.
* The number of threads per core is ThreadsPerCore+1.
* 7:0 CoreId: core ID. Read-only. Reset: XXh.
*
* NOTE: CoreId is already part of apic_id. Just use it. We can
* use all the 8 bits to represent the core_id here.
*/
if (cs->nr_threads - 1) {
*ebx = ((cs->nr_threads - 1) << 8) | (topo.node_id << 3) |
(topo.ccx_id << 2) | topo.core_id;
} else {
*ebx = (topo.node_id << 4) | (topo.ccx_id << 3) | topo.core_id;
}
*ebx = ((topo_info->threads_per_core - 1) << 8) | (topo_ids.core_id & 0xFF);
/*
* CPUID_Fn8000001E_ECX
* 31:11 Reserved
* 10:8 Nodes per processor (Nodes per processor is number of nodes + 1)
* 7:0 Node id (see bit decoding below)
* 2 Socket id
* 1:0 Node id
* CPUID_Fn8000001E_ECX [Node Identifiers] (NodeId)
* Read-only. Reset: 0000_0XXXh.
* Core::X86::Cpuid::NodeId_lthree[1:0]_core[3:0]_thread[1:0];
* Bits Description
* 31:11 Reserved.
* 10:8 NodesPerProcessor: Node per processor. Read-only. Reset: XXXb.
* ValidValues:
* Value Description
* 000b 1 node per processor.
* 001b 2 nodes per processor.
* 010b Reserved.
* 011b 4 nodes per processor.
* 111b-100b Reserved.
* 7:0 NodeId: Node ID. Read-only. Reset: XXh.
*
* NOTE: Hardware reserves 3 bits for number of nodes per processor.
* But users can create more nodes than the actual hardware can
* support. To genaralize we can use all the upper 8 bits for nodes.
* NodeId is combination of node and socket_id which is already decoded
* in apic_id. Just use it by shifting.
*/
if (topo.num_nodes <= 4) {
*ecx = ((topo.num_nodes - 1) << 8) | (cpu->socket_id << 2) |
topo.node_id;
} else {
/*
* Node id fix up. Actual hardware supports up to 4 nodes. But with
* more than 32 cores, we may end up with more than 4 nodes.
* Node id is a combination of socket id and node id. Only requirement
* here is that this number should be unique accross the system.
* Shift the socket id to accommodate more nodes. We dont expect both
* socket id and node id to be big number at the same time. This is not
* an ideal config but we need to to support it. Max nodes we can have
* is 32 (255/8) with 8 cores per node and 255 max cores. We only need
* 5 bits for nodes. Find the left most set bit to represent the total
* number of nodes. find_last_bit returns last set bit(0 based). Left
* shift(+1) the socket id to represent all the nodes.
*/
nodes = topo.num_nodes - 1;
shift = find_last_bit(&nodes, 8);
*ecx = ((topo.num_nodes - 1) << 8) | (cpu->socket_id << (shift + 1)) |
topo.node_id;
}
*ecx = ((topo_info->dies_per_pkg - 1) << 8) |
((cpu->apic_id >> apicid_die_offset(topo_info)) & 0xFF);
*edx = 0;
}
@ -5995,20 +5891,20 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
}
switch (count) {
case 0: /* L1 dcache info */
encode_cache_cpuid8000001d(env->cache_info_amd.l1d_cache, cs,
eax, ebx, ecx, edx);
encode_cache_cpuid8000001d(env->cache_info_amd.l1d_cache,
&topo_info, eax, ebx, ecx, edx);
break;
case 1: /* L1 icache info */
encode_cache_cpuid8000001d(env->cache_info_amd.l1i_cache, cs,
eax, ebx, ecx, edx);
encode_cache_cpuid8000001d(env->cache_info_amd.l1i_cache,
&topo_info, eax, ebx, ecx, edx);
break;
case 2: /* L2 cache info */
encode_cache_cpuid8000001d(env->cache_info_amd.l2_cache, cs,
eax, ebx, ecx, edx);
encode_cache_cpuid8000001d(env->cache_info_amd.l2_cache,
&topo_info, eax, ebx, ecx, edx);
break;
case 3: /* L3 cache info */
encode_cache_cpuid8000001d(env->cache_info_amd.l3_cache, cs,
eax, ebx, ecx, edx);
encode_cache_cpuid8000001d(env->cache_info_amd.l3_cache,
&topo_info, eax, ebx, ecx, edx);
break;
default: /* end of info */
*eax = *ebx = *ecx = *edx = 0;
@ -6017,7 +5913,7 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
break;
case 0x8000001E:
assert(cpu->core_id <= 255);
encode_topo_cpuid8000001e(cs, cpu,
encode_topo_cpuid8000001e(cpu, &topo_info,
eax, ebx, ecx, edx);
break;
case 0xC0000000:
@ -7263,7 +7159,7 @@ static Property x86_cpu_properties[] = {
DEFINE_PROP_BOOL("pmu", X86CPU, enable_pmu, false),
DEFINE_PROP_UINT32("hv-spinlocks", X86CPU, hyperv_spinlock_attempts,
HYPERV_SPINLOCK_NEVER_RETRY),
HYPERV_SPINLOCK_NEVER_NOTIFY),
DEFINE_PROP_BIT64("hv-relaxed", X86CPU, hyperv_features,
HYPERV_FEAT_RELAXED, 0),
DEFINE_PROP_BIT64("hv-vapic", X86CPU, hyperv_features,

4
target/i386/cpu.h
View File

@ -991,8 +991,8 @@ typedef uint64_t FeatureWordArray[FEATURE_WORDS];
#define HYPERV_FEAT_IPI 13
#define HYPERV_FEAT_STIMER_DIRECT 14
#ifndef HYPERV_SPINLOCK_NEVER_RETRY
#define HYPERV_SPINLOCK_NEVER_RETRY 0xFFFFFFFF
#ifndef HYPERV_SPINLOCK_NEVER_NOTIFY
#define HYPERV_SPINLOCK_NEVER_NOTIFY 0xFFFFFFFF
#endif
#define EXCP00_DIVZ 0

4
target/i386/kvm.c
View File

@ -730,7 +730,7 @@ static bool hyperv_enabled(X86CPU *cpu)
{
CPUState *cs = CPU(cpu);
return kvm_check_extension(cs->kvm_state, KVM_CAP_HYPERV) > 0 &&
((cpu->hyperv_spinlock_attempts != HYPERV_SPINLOCK_NEVER_RETRY) ||
((cpu->hyperv_spinlock_attempts != HYPERV_SPINLOCK_NEVER_NOTIFY) ||
cpu->hyperv_features || cpu->hyperv_passthrough);
}
@ -1236,7 +1236,7 @@ static int hyperv_handle_properties(CPUState *cs,
env->features[FEAT_HV_RECOMM_EAX] = c->eax;
/* hv-spinlocks may have been overriden */
if (cpu->hyperv_spinlock_attempts != HYPERV_SPINLOCK_NEVER_RETRY) {
if (cpu->hyperv_spinlock_attempts != HYPERV_SPINLOCK_NEVER_NOTIFY) {
c->ebx = cpu->hyperv_spinlock_attempts;
}
}