[v4,21/66] i386/tdx: Integrate tdx_caps->attrs_fixed0/1 to tdx_cpuid_lookup

Commit Message

Xiaoyao Li Jan. 25, 2024, 3:22 a.m. UTC

Some bits in TD attributes have corresponding CPUID feature bits. Reflect
the fixed0/1 restriction on TD attributes to their corresponding CPUID
bits in tdx_cpuid_lookup[] as well.

Signed-off-by: Xiaoyao Li <[e-mail]>
---
Changes in v4:
 - reverse the meaning of tdx_caps->attr_fixed0, because value 0 of bit
   means the bit must be fixed 0.
---
 target/i386/cpu-internal.h |  9 +++++++++
 target/i386/cpu.c          |  9 ---------
 target/i386/cpu.h          |  2 ++
 target/i386/kvm/tdx.c      | 21 +++++++++++++++++++++
 4 files changed, 32 insertions(+), 9 deletions(-)

Patch

diff --git a/target/i386/cpu-internal.h b/target/i386/cpu-internal.h
index 9baac5c0b450..e980f6e3147f 100644
--- a/target/i386/cpu-internal.h
+++ b/target/i386/cpu-internal.h
@@ -20,6 +20,15 @@ 
 #ifndef I386_CPU_INTERNAL_H
 #define I386_CPU_INTERNAL_H
 
+typedef struct FeatureMask {
+    FeatureWord index;
+    uint64_t mask;
+} FeatureMask;
+
+typedef struct FeatureDep {
+    FeatureMask from, to;
+} FeatureDep;
+
 typedef enum FeatureWordType {
    CPUID_FEATURE_WORD,
    MSR_FEATURE_WORD,
diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 160ba8c940a2..39b07f8e1204 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -1442,15 +1442,6 @@  FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
     },
 };
 
-typedef struct FeatureMask {
-    FeatureWord index;
-    uint64_t mask;
-} FeatureMask;
-
-typedef struct FeatureDep {
-    FeatureMask from, to;
-} FeatureDep;
-
 static FeatureDep feature_dependencies[] = {
     {
         .from = { FEAT_7_0_EDX,             CPUID_7_0_EDX_ARCH_CAPABILITIES },
diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index 23d187d7cc5f..2091451a140e 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -876,6 +876,8 @@  uint64_t x86_cpu_get_supported_feature_word(FeatureWord w,
 #define CPUID_7_0_ECX_MAWAU             (31U << 17)
 /* Read Processor ID */
 #define CPUID_7_0_ECX_RDPID             (1U << 22)
+/* KeyLocker */
+#define CPUID_7_0_ECX_KeyLocker         (1U << 23)
 /* Bus Lock Debug Exception */
 #define CPUID_7_0_ECX_BUS_LOCK_DETECT   (1U << 24)
 /* Cache Line Demote Instruction */
diff --git a/target/i386/kvm/tdx.c b/target/i386/kvm/tdx.c
index 4c8455783e36..6caefb27d90a 100644
--- a/target/i386/kvm/tdx.c
+++ b/target/i386/kvm/tdx.c
@@ -32,6 +32,13 @@ 
                                      (1U << KVM_FEATURE_PV_SCHED_YIELD) | \
                                      (1U << KVM_FEATURE_MSI_EXT_DEST_ID))
 
+#define TDX_ATTRIBUTES_MAX_BITS      64
+
+static FeatureMask tdx_attrs_ctrl_fields[TDX_ATTRIBUTES_MAX_BITS] = {
+    [30] = { .index = FEAT_7_0_ECX, .mask = CPUID_7_0_ECX_PKS },
+    [31] = { .index = FEAT_7_0_ECX, .mask = CPUID_7_0_ECX_KeyLocker},
+};
+
 typedef struct KvmTdxCpuidLookup {
     uint32_t tdx_fixed0;
     uint32_t tdx_fixed1;
@@ -383,6 +390,8 @@  static void update_tdx_cpuid_lookup_by_tdx_caps(void)
     FeatureWordInfo *fi;
     uint32_t config;
     FeatureWord w;
+    FeatureMask *fm;
+    int i;
 
     for (w = 0; w < FEATURE_WORDS; w++) {
         fi = &feature_word_info[w];
@@ -408,6 +417,18 @@  static void update_tdx_cpuid_lookup_by_tdx_caps(void)
         entry->tdx_fixed1 &= ~config;
     }
 
+    for (i = 0; i < ARRAY_SIZE(tdx_attrs_ctrl_fields); i++) {
+        fm = &tdx_attrs_ctrl_fields[i];
+
+        if (~(tdx_caps->attrs_fixed0 & (1ULL << i))) {
+            tdx_cpuid_lookup[fm->index].tdx_fixed0 |= fm->mask;
+        }
+
+        if (tdx_caps->attrs_fixed1 & (1ULL << i)) {
+            tdx_cpuid_lookup[fm->index].tdx_fixed1 |= fm->mask;
+        }
+    }
+
     /*
      * Because KVM gets XFAM settings via CPUID leaves 0xD,  map
      * tdx_caps->xfam_fixed{0, 1} into tdx_cpuid_lookup[].tdx_fixed{0, 1}.