Merge tag 'x86_cpu_for_v6.18_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 cpuid updates from Borislav Petkov:

 - Make UMIP instruction detection more robust

 - Correct and cleanup AMD CPU topology detection; document the relevant
   CPUID leaves topology parsing precedence on AMD

 - Add support for running the kernel as guest on FreeBSD's Bhyve
   hypervisor

 - Cleanups and improvements

* tag 'x86_cpu_for_v6.18_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/umip: Fix decoding of register forms of 0F 01 (SGDT and SIDT aliases)
  x86/umip: Check that the instruction opcode is at least two bytes
  Documentation/x86/topology: Detail CPUID leaves used for topology enumeration
  x86/cpu/topology: Define AMD64_CPUID_EXT_FEAT MSR
  x86/cpu/topology: Check for X86_FEATURE_XTOPOLOGY instead of passing has_xtopology
  x86/cpu/cacheinfo: Simplify cacheinfo_amd_init_llc_id() using _cpuid4_info
  x86/cpu: Rename and move CPU model entry for Diamond Rapids
  x86/cpu: Detect FreeBSD Bhyve hypervisor

1 files changed, 21 insertions, 27 deletions

diff --git a/arch/x86/kernel/cpu/cacheinfo.c b/arch/x86/kernel/cpu/cacheinfo.c
index adfa7e8bb865..51a95b07831f 100644
--- a/arch/x86/kernel/cpu/cacheinfo.c
+++ b/arch/x86/kernel/cpu/cacheinfo.c
@@ -290,6 +290,22 @@ static int find_num_cache_leaves(struct cpuinfo_x86 *c)
 }
 
 /*
+ * The max shared threads number comes from CPUID(0x4) EAX[25-14] with input
+ * ECX as cache index. Then right shift apicid by the number's order to get
+ * cache id for this cache node.
+ */
+static unsigned int get_cache_id(u32 apicid, const struct _cpuid4_info *id4)
+{
+	unsigned long num_threads_sharing;
+	int index_msb;
+
+	num_threads_sharing = 1 + id4->eax.split.num_threads_sharing;
+	index_msb = get_count_order(num_threads_sharing);
+
+	return apicid >> index_msb;
+}
+
+/*
  * AMD/Hygon CPUs may have multiple LLCs if L3 caches exist.
  */
 
@@ -312,18 +328,11 @@ void cacheinfo_amd_init_llc_id(struct cpuinfo_x86 *c, u16 die_id)
 		 * Newer families: LLC ID is calculated from the number
 		 * of threads sharing the L3 cache.
 		 */
-		u32 eax, ebx, ecx, edx, num_sharing_cache = 0;
 		u32 llc_index = find_num_cache_leaves(c) - 1;
+		struct _cpuid4_info id4 = {};
 
-		cpuid_count(0x8000001d, llc_index, &eax, &ebx, &ecx, &edx);
-		if (eax)
-			num_sharing_cache = ((eax >> 14) & 0xfff) + 1;
-
-		if (num_sharing_cache) {
-			int index_msb = get_count_order(num_sharing_cache);
-
-			c->topo.llc_id = c->topo.apicid >> index_msb;
-		}
+		if (!amd_fill_cpuid4_info(llc_index, &id4))
+			c->topo.llc_id = get_cache_id(c->topo.apicid, &id4);
 	}
 }
 
@@ -598,27 +607,12 @@ int init_cache_level(unsigned int cpu)
 	return 0;
 }
 
-/*
- * The max shared threads number comes from CPUID(0x4) EAX[25-14] with input
- * ECX as cache index. Then right shift apicid by the number's order to get
- * cache id for this cache node.
- */
-static void get_cache_id(int cpu, struct _cpuid4_info *id4)
-{
-	struct cpuinfo_x86 *c = &cpu_data(cpu);
-	unsigned long num_threads_sharing;
-	int index_msb;
-
-	num_threads_sharing = 1 + id4->eax.split.num_threads_sharing;
-	index_msb = get_count_order(num_threads_sharing);
-	id4->id = c->topo.apicid >> index_msb;
-}
-
 int populate_cache_leaves(unsigned int cpu)
 {
 	struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
 	struct cacheinfo *ci = this_cpu_ci->info_list;
 	u8 cpu_vendor = boot_cpu_data.x86_vendor;
+	u32 apicid = cpu_data(cpu).topo.apicid;
 	struct amd_northbridge *nb = NULL;
 	struct _cpuid4_info id4 = {};
 	int idx, ret;
@@ -628,7 +622,7 @@ int populate_cache_leaves(unsigned int cpu)
 		if (ret)
 			return ret;
 
-		get_cache_id(cpu, &id4);
+		id4.id = get_cache_id(apicid, &id4);
 
 		if (cpu_vendor == X86_VENDOR_AMD || cpu_vendor == X86_VENDOR_HYGON)
 			nb = amd_init_l3_cache(idx);