diff mbox series

[v4,5/8] i386: Add CPUID enumeration for RDT

Message ID 20241205200025.2081863-6-whendrik@google.com (mailing list archive)
State New
Headers show
Series Emulate Intel RDT features needed to mount ResCtrl in Linux | expand

Commit Message

Hendrik Wuethrich Dec. 5, 2024, 8 p.m. UTC 
From: ‪Hendrik Wüthrich <whendrik@google.com>

Add CPUID enumeration for intel RDT monitoring and allocation, as well
as the flags used in the enumeration code.

Signed-off-by: Hendrik Wüthrich <whendrik@google.com>
---
 hw/i386/rdt.c         | 30 ++++++++++++++++++
 include/hw/i386/rdt.h | 31 +++++++++++++++++++
 target/i386/cpu.c     | 71 +++++++++++++++++++++++++++++++++++++++++++
 target/i386/cpu.h     |  5 +++
 4 files changed, 137 insertions(+)
diff mbox series

Patch

diff --git a/hw/i386/rdt.c b/hw/i386/rdt.c
index 3a37341bd6..1409f9a904 100644
--- a/hw/i386/rdt.c
+++ b/hw/i386/rdt.c
@@ -35,6 +35,17 @@ 
 #define RDT_MAX_L2_MASK_COUNT      63
 #define RDT_MAX_MBA_THRTL_COUNT    63
 
+/* RDT L3 Allocation features */
+#define CPUID_10_1_EAX_CBM_LENGTH       0xf
+#define CPUID_10_1_EBX_CBM              0x0
+#define CPUID_10_1_ECX_CDP              0x0 // to enable, it would be (1U << 2)
+/* RDT L2 Allocation features*/
+#define CPUID_10_2_EAX_CBM_LENGTH       0xf
+#define CPUID_10_2_EBX_CBM              0x0
+/* RDT MBA features */
+#define CPUID_10_3_EAX_THRTL_MAX        89
+#define CPUID_10_3_ECX_LINEAR_RESPONSE (1U << 2)
+
 #define TYPE_RDT "rdt"
 #define RDT_NUM_RMID_PROP "rmids"
 
@@ -81,8 +92,27 @@  struct RDTState {
 struct RDTStateClass {
 };
 
+uint32_t rdt_get_cpuid_15_0_edx_l3(void) { return CPUID_15_1_EDX_L3_OCCUPANCY | CPUID_15_1_EDX_L3_TOTAL_BW | CPUID_15_1_EDX_L3_LOCAL_BW; }
+
+uint32_t rdt_cpuid_15_1_edx_l3_total_bw_enabled(void) { return CPUID_15_1_EDX_L3_TOTAL_BW; }
+uint32_t rdt_cpuid_15_1_edx_l3_local_bw_enabled(void) { return CPUID_15_1_EDX_L3_LOCAL_BW; }
+uint32_t rdt_cpuid_15_1_edx_l3_occupancy_enabled(void) { return CPUID_15_1_EDX_L3_OCCUPANCY; }
+
+uint32_t rdt_cpuid_10_0_ebx_l3_cat_enabled(void) { return CPUID_10_0_EBX_L3_CAT; }
+uint32_t rdt_cpuid_10_0_ebx_l2_cat_enabled(void) { return CPUID_10_0_EBX_L2_CAT; }
+uint32_t rdt_cpuid_10_0_ebx_l2_mba_enabled(void) { return CPUID_10_0_EBX_MBA; }
+
+uint32_t rdt_get_cpuid_10_1_eax_cbm_length(void) { return CPUID_10_1_EAX_CBM_LENGTH; }
+uint32_t rdt_cpuid_10_1_ebx_cbm_enabled(void) { return CPUID_10_1_EBX_CBM; }
+uint32_t rdt_cpuid_10_1_ecx_cdp_enabled(void) { return CPUID_10_1_ECX_CDP; }
 uint32_t rdt_get_cpuid_10_1_edx_cos_max(void) { return RDT_MAX_L3_MASK_COUNT; }
+
+uint32_t rdt_get_cpuid_10_2_eax_cbm_length(void) { return CPUID_10_2_EAX_CBM_LENGTH; }
+uint32_t rdt_cpuid_10_2_ebx_cbm_enabled(void) { return CPUID_10_2_EBX_CBM; }
 uint32_t rdt_get_cpuid_10_2_edx_cos_max(void) { return RDT_MAX_L2_MASK_COUNT; }
+
+uint32_t rdt_get_cpuid_10_3_eax_thrtl_max(void) { return CPUID_10_3_EAX_THRTL_MAX; }
+uint32_t rdt_cpuid_10_3_eax_linear_response_enabled(void) { return CPUID_10_3_ECX_LINEAR_RESPONSE; }
 uint32_t rdt_get_cpuid_10_3_edx_cos_max(void) { return RDT_MAX_MBA_THRTL_COUNT; }
 
 bool rdt_associate_rmid_cos(uint64_t msr_ia32_pqr_assoc)
diff --git a/include/hw/i386/rdt.h b/include/hw/i386/rdt.h
index ec82a149f2..57d2fa5b77 100644
--- a/include/hw/i386/rdt.h
+++ b/include/hw/i386/rdt.h
@@ -20,13 +20,44 @@ 
 #include <stdbool.h>
 #include <stdint.h>
 
+/* RDT L3 Cache Monitoring Technology */
+#define CPUID_15_0_EDX_L3               (1U << 1)
+#define CPUID_15_1_EDX_L3_OCCUPANCY     (1U << 0)
+#define CPUID_15_1_EDX_L3_TOTAL_BW      (1U << 1)
+#define CPUID_15_1_EDX_L3_LOCAL_BW      (1U << 2)
+
+/* RDT Cache Allocation Technology */
+#define CPUID_10_0_EBX_L3_CAT           (1U << 1)
+#define CPUID_10_0_EBX_L2_CAT           (1U << 2)
+#define CPUID_10_0_EBX_MBA              (1U << 3)
+#define CPUID_10_0_EDX CPUID_10_0_EBX_L3_CAT | CPUID_10_0_EBX_L2_CAT | CPUID_10_0_EBX_MBA
+
 typedef struct RDTState RDTState;
 typedef struct RDTStatePerCore RDTStatePerCore;
 typedef struct RDTMonitor RDTMonitor;
 typedef struct RDTAllocation RDTAllocation;
 
+uint32_t rdt_get_cpuid_15_0_edx_l3(void);
+
+uint32_t rdt_cpuid_15_1_edx_l3_total_bw_enabled(void);
+uint32_t rdt_cpuid_15_1_edx_l3_local_bw_enabled(void);
+uint32_t rdt_cpuid_15_1_edx_l3_occupancy_enabled(void);
+
+uint32_t rdt_cpuid_10_0_ebx_l3_cat_enabled(void);
+uint32_t rdt_cpuid_10_0_ebx_l2_cat_enabled(void);
+uint32_t rdt_cpuid_10_0_ebx_l2_mba_enabled(void);
+
+uint32_t rdt_get_cpuid_10_1_eax_cbm_length(void);
+uint32_t rdt_cpuid_10_1_ebx_cbm_enabled(void);
+uint32_t rdt_cpuid_10_1_ecx_cdp_enabled(void);
 uint32_t rdt_get_cpuid_10_1_edx_cos_max(void);
+
+uint32_t rdt_get_cpuid_10_2_eax_cbm_length(void);
+uint32_t rdt_cpuid_10_2_ebx_cbm_enabled(void);
 uint32_t rdt_get_cpuid_10_2_edx_cos_max(void);
+
+uint32_t rdt_get_cpuid_10_3_eax_thrtl_max(void);
+uint32_t rdt_cpuid_10_3_eax_linear_response_enabled(void);
 uint32_t rdt_get_cpuid_10_3_edx_cos_max(void);
 
 bool rdt_associate_rmid_cos(uint64_t msr_ia32_pqr_assoc);
diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 3725dbbc4b..bbe2da8ebb 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -41,6 +41,7 @@ 
 #include "hw/boards.h"
 #include "hw/i386/sgx-epc.h"
 #endif
+#include "hw/i386/rdt.h"
 
 #include "disas/capstone.h"
 #include "cpu-internal.h"
@@ -6725,6 +6726,76 @@  void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
         assert(!(*eax & ~0x1f));
         *ebx &= 0xffff; /* The count doesn't need to be reliable. */
         break;
+#ifndef CONFIG_USER_ONLY
+    case 0xF:
+        /* Shared Resource Monitoring Enumeration Leaf */
+        *eax = 0;
+        *ebx = 0;
+        *ecx = 0;
+        *edx = 0;
+        if (!(env->features[FEAT_7_0_EBX] & CPUID_7_0_EBX_PQM))
+            break;
+        if (!(cpu->rdt)) {
+            warn_report("Intel RDT features enabled in commandline, "
+                        "but rdt device not used");
+            break;
+        }
+        /* Non-zero count is ResId */
+        switch (count) {
+            /* Monitoring Resource Type Enumeration */
+        case 0:
+            *edx = env->features[FEAT_RDT_15_0_EDX];
+            *ebx = rdt_max_rmid(cpu->rdt);
+            break;
+        case 1:
+            *ebx = 1;
+            *ecx = rdt_max_rmid(cpu->rdt);
+            *edx = rdt_cpuid_15_1_edx_l3_total_bw_enabled() |
+                    rdt_cpuid_15_1_edx_l3_local_bw_enabled() |
+                   rdt_cpuid_15_1_edx_l3_occupancy_enabled();
+            break;
+        }
+        break;
+    case 0x10:
+        /* Shared Resource Director Technology Allocation Enumeration Leaf */
+        *eax = 0;
+        *ebx = 0;
+        *ecx = 0;
+        *edx = 0;
+        if (!(env->features[FEAT_7_0_EBX] & CPUID_7_0_EBX_PQE))
+            break;
+        if (!(cpu->rdt)) {
+            warn_report("Intel RDT features enabled in commandline, "
+                        "but rdt device not used");
+            break;
+        }
+        /* Non-zero count is ResId */
+        switch (count) {
+            /* Cache Allocation Technology Available Resource Types */
+        case 0:
+            *ebx |= rdt_cpuid_10_0_ebx_l3_cat_enabled();
+            *ebx |= rdt_cpuid_10_0_ebx_l2_cat_enabled();
+            *ebx |= rdt_cpuid_10_0_ebx_l2_mba_enabled();
+            break;
+        case 1:
+            *eax = rdt_get_cpuid_10_1_eax_cbm_length();
+            *ebx = rdt_cpuid_10_1_ebx_cbm_enabled();
+            *ecx |= rdt_cpuid_10_1_ecx_cdp_enabled();
+            *edx =  rdt_get_cpuid_10_1_edx_cos_max();
+            break;
+        case 2:
+            *eax = rdt_get_cpuid_10_2_eax_cbm_length();
+            *ebx = rdt_cpuid_10_2_ebx_cbm_enabled();
+            *edx =  rdt_get_cpuid_10_2_edx_cos_max();
+            break;
+        case 3:
+            *eax = rdt_get_cpuid_10_3_eax_thrtl_max();
+            *ecx = rdt_cpuid_10_3_eax_linear_response_enabled();
+            *edx = rdt_get_cpuid_10_3_edx_cos_max();
+            break;
+        }
+        break;
+#endif
     case 0x1C:
         if (cpu->enable_pmu && (env->features[FEAT_7_0_EDX] & CPUID_7_0_EDX_ARCH_LBR)) {
             x86_cpu_get_supported_cpuid(0x1C, 0, eax, ebx, ecx, edx);
diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index 64a53efa30..98407c8e18 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -678,6 +678,7 @@  typedef enum FeatureWord {
     FEAT_7_1_EDX,       /* CPUID[EAX=7,ECX=1].EDX */
     FEAT_7_2_EDX,       /* CPUID[EAX=7,ECX=2].EDX */
     FEAT_24_0_EBX,      /* CPUID[EAX=0x24,ECX=0].EBX */
+    FEAT_RDT_15_0_EDX,  /* CPUID[EAX=0xf,ECX=0].EDX (RDT CMT/MBM) */
     FEATURE_WORDS,
 } FeatureWord;
 
@@ -852,8 +853,12 @@  uint64_t x86_cpu_get_supported_feature_word(X86CPU *cpu, FeatureWord w);
 #define CPUID_7_0_EBX_RTM               (1U << 11)
 /* Zero out FPU CS and FPU DS */
 #define CPUID_7_0_EBX_ZERO_FCS_FDS      (1U << 13)
+/* Resource Director Technology Monitoring */
+#define CPUID_7_0_EBX_PQM               (1U << 12)
 /* Memory Protection Extension */
 #define CPUID_7_0_EBX_MPX               (1U << 14)
+/* Resource Director Technology Allocation */
+#define CPUID_7_0_EBX_PQE               (1U << 15)
 /* AVX-512 Foundation */
 #define CPUID_7_0_EBX_AVX512F           (1U << 16)
 /* AVX-512 Doubleword & Quadword Instruction */