[PATCH v4 4/8] i386: Add RDT device interface through MSRs

[Hendrik Wuethrich]

From: ‪Hendrik Wüthrich <whendrik@google.com>

Implement rdmsr and wrmsr for the following MSRs:
* MSR_IA32_PQR_ASSOC
* MSR_IA32_QM_EVTSEL
* MSR_IA32_QM_CTR
* IA32_L3_QOS_Mask_n
* IA32_L2_QOS_Mask_n
* IA32_L2_QoS_Ext_BW_Thrtl_n

This allows for the guest to call RDT-internal functions to
associate an RMID with a CLOSID / set an active RMID for
monitoring, read monitoring data, and set classes of service.

Signed-off-by: Hendrik Wüthrich <whendrik@google.com>
---
 hw/i386/rdt.c                        |  4 ++
 include/hw/i386/rdt.h                |  4 ++
 target/i386/cpu.h                    | 14 +++++
 target/i386/tcg/sysemu/misc_helper.c | 81 ++++++++++++++++++++++++++++
 4 files changed, 103 insertions(+)

diff --git a/hw/i386/rdt.c b/hw/i386/rdt.c
index 01bee79cbe..3a37341bd6 100644
--- a/hw/i386/rdt.c
+++ b/hw/i386/rdt.c
@@ -81,6 +81,10 @@ struct RDTState {
 struct RDTStateClass {
 };
 
+uint32_t rdt_get_cpuid_10_1_edx_cos_max(void) { return RDT_MAX_L3_MASK_COUNT; }
+uint32_t rdt_get_cpuid_10_2_edx_cos_max(void) { return RDT_MAX_L2_MASK_COUNT; }
+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)
 {
     X86CPU *cpu = X86_CPU(current_cpu);
diff --git a/include/hw/i386/rdt.h b/include/hw/i386/rdt.h
index 14b1c64b72..ec82a149f2 100644
--- a/include/hw/i386/rdt.h
+++ b/include/hw/i386/rdt.h
@@ -25,6 +25,10 @@ typedef struct RDTStatePerCore RDTStatePerCore;
 typedef struct RDTMonitor RDTMonitor;
 typedef struct RDTAllocation RDTAllocation;
 
+uint32_t rdt_get_cpuid_10_1_edx_cos_max(void);
+uint32_t rdt_get_cpuid_10_2_edx_cos_max(void);
+uint32_t rdt_get_cpuid_10_3_edx_cos_max(void);
+
 bool rdt_associate_rmid_cos(uint64_t msr_ia32_pqr_assoc);
 
 void rdt_write_msr_l3_mask(uint32_t pos, uint32_t val);
diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index 0f73c1244d..64a53efa30 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -576,6 +576,17 @@ typedef enum X86Seg {
 #define MSR_IA32_VMX_TRUE_ENTRY_CTLS     0x00000490
 #define MSR_IA32_VMX_VMFUNC             0x00000491
 
+#define MSR_IA32_QM_EVTSEL                  0x0c8d
+#define MSR_IA32_QM_CTR                     0x0c8e
+#define MSR_IA32_PQR_ASSOC                  0x0c8f
+
+#define MSR_IA32_L3_CBM_BASE                0x0c90
+#define MSR_IA32_L3_MASKS_END               0x0d0f
+#define MSR_IA32_L2_CBM_BASE                0x0d10
+#define MSR_IA32_L2_CBM_END                 0x0d4f
+#define MSR_IA32_L2_QOS_Ext_BW_Thrtl_BASE   0xd50
+#define MSR_IA32_L2_QOS_Ext_BW_Thrtl_END    0xd8f
+
 #define MSR_APIC_START                  0x00000800
 #define MSR_APIC_END                    0x000008ff
 
@@ -1839,6 +1850,9 @@ typedef struct CPUArchState {
     uint64_t msr_ia32_feature_control;
     uint64_t msr_ia32_sgxlepubkeyhash[4];
 
+    uint64_t msr_ia32_qm_evtsel;
+    uint64_t msr_ia32_pqr_assoc;
+
     uint64_t msr_fixed_ctr_ctrl;
     uint64_t msr_global_ctrl;
     uint64_t msr_global_status;
diff --git a/target/i386/tcg/sysemu/misc_helper.c 
b/target/i386/tcg/sysemu/misc_helper.c
index 094aa56a20..a6c6b11a29 100644
--- a/target/i386/tcg/sysemu/misc_helper.c
+++ b/target/i386/tcg/sysemu/misc_helper.c
@@ -25,6 +25,7 @@
 #include "exec/address-spaces.h"
 #include "exec/exec-all.h"
 #include "tcg/helper-tcg.h"
+#include "hw/i386/rdt.h"
 #include "hw/i386/apic.h"
 
 void helper_outb(CPUX86State *env, uint32_t port, uint32_t data)
@@ -293,6 +294,45 @@ void helper_wrmsr(CPUX86State *env)
         env->msr_bndcfgs = val;
         cpu_sync_bndcs_hflags(env);
         break;
+    case MSR_IA32_QM_EVTSEL:
+        env->msr_ia32_qm_evtsel = val;
+        break;
+    case MSR_IA32_PQR_ASSOC:
+        env->msr_ia32_pqr_assoc = val;
+
+        if (!rdt_associate_rmid_cos(val))
+            goto error;
+        break;
+    case MSR_IA32_L3_CBM_BASE ... MSR_IA32_L3_MASKS_END:
+    {
+        uint32_t pos = (uint32_t)env->regs[R_ECX] - MSR_IA32_L3_CBM_BASE;
+
+        if (pos > rdt_get_cpuid_10_1_edx_cos_max()) {
+            goto error;
+        }
+        rdt_write_msr_l3_mask(pos, val);
+        break;
+    }
+    case MSR_IA32_L2_CBM_BASE ... MSR_IA32_L2_CBM_END:
+    {
+        uint32_t pos = (uint32_t)env->regs[R_ECX] - MSR_IA32_L2_CBM_BASE;
+
+        if (pos > rdt_get_cpuid_10_2_edx_cos_max()) {
+            goto error;
+        }
+        rdt_write_msr_l2_mask(pos, val);
+        break;
+    }
+    case MSR_IA32_L2_QOS_Ext_BW_Thrtl_BASE ... 
MSR_IA32_L2_QOS_Ext_BW_Thrtl_END:
+    {
+        uint32_t pos = (uint32_t)env->regs[R_ECX] - 
MSR_IA32_L2_QOS_Ext_BW_Thrtl_BASE;
+
+        if (pos > rdt_get_cpuid_10_3_edx_cos_max()) {
+            goto error;
+        }
+        rdt_write_mba_thrtl(pos, val);
+        break;
+    }
     case MSR_APIC_START ... MSR_APIC_END: {
         int ret;
         int index = (uint32_t)env->regs[R_ECX] - MSR_APIC_START;
@@ -472,6 +512,47 @@ void helper_rdmsr(CPUX86State *env)
         val = (cs->nr_threads * cs->nr_cores) | (cs->nr_cores << 16);
         break;
     }
+    case MSR_IA32_QM_CTR:
+        val = rdt_read_event_count(x86_cpu->rdt,
+                                   (env->msr_ia32_qm_evtsel >> 32) & 0xff,
+                                   env->msr_ia32_qm_evtsel & 0xff);
+        break;
+    case MSR_IA32_QM_EVTSEL:
+        val = env->msr_ia32_qm_evtsel;
+        break;
+    case MSR_IA32_PQR_ASSOC:
+        val = env->msr_ia32_pqr_assoc;
+        break;
+    case MSR_IA32_L3_CBM_BASE ... MSR_IA32_L3_MASKS_END:
+    {
+        uint32_t pos = (uint32_t)env->regs[R_ECX] - MSR_IA32_L3_CBM_BASE;
+
+        if (pos >= rdt_get_cpuid_10_1_edx_cos_max()) {
+            raise_exception_err_ra(env, EXCP0D_GPF, 0, GETPC());
+        }
+        val = rdt_read_l3_mask(pos);
+        break;
+    }
+    case MSR_IA32_L2_CBM_BASE ... MSR_IA32_L2_CBM_END:
+    {
+        uint32_t pos = (uint32_t)env->regs[R_ECX] - MSR_IA32_L2_CBM_BASE;
+
+        if (pos >= rdt_get_cpuid_10_2_edx_cos_max()) {
+            raise_exception_err_ra(env, EXCP0D_GPF, 0, GETPC());
+        }
+        val = rdt_read_l2_mask(pos);
+        break;
+    }
+    case MSR_IA32_L2_QOS_Ext_BW_Thrtl_BASE ... 
MSR_IA32_L2_QOS_Ext_BW_Thrtl_END:
+    {
+        uint32_t pos = (uint32_t)env->regs[R_ECX] - 
MSR_IA32_L2_QOS_Ext_BW_Thrtl_BASE;
+
+        if (pos >= rdt_get_cpuid_10_3_edx_cos_max()) {
+            raise_exception_err_ra(env, EXCP0D_GPF, 0, GETPC());
+        }
+        val = rdt_read_mba_thrtl(pos);
+        break;
+    }
     case MSR_APIC_START ... MSR_APIC_END: {
         int ret;
         int index = (uint32_t)env->regs[R_ECX] - MSR_APIC_START;
-- 
2.47.0.338.g60cca15819-goog