i386/cpu: Clean up arch lbr xsave struct and comment

Arch LBR state is area 15, not 19. Fix this comment. And considerring
other areas don't mention user or supervisor state, for consistent
style, remove "Supervisor mode" from its comment.

Moreover, rename XSavesArchLBR to XSaveArchLBR since there's no need to
emphasize XSAVES in naming; the XSAVE related structure is mainly
used to represent memory layout.

In addition, arch lbr specifies its offset of xsave component as 0. But
this cannot help on anything. The offset of ExtSaveArea is initialized
by accelerators (e.g., hvf_cpu_xsave_init(), kvm_cpu_xsave_init() and
x86_tcg_cpu_xsave_init()), so explicitly setting the offset doesn't
work and CPUID 0xD encoding has already ensure supervisor states won't
have non-zero offsets. Drop the offset initialization and its comment
from the xsave area of arch lbr.

Tested-by: Farrah Chen <farrah.chen@intel.com>
Reviewed-by: Zide Chen <zide.chen@intel.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
Link: https://lore.kernel.org/r/20251211060801.3600039-3-zhao1.liu@intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index a1de82b92c72dc5d084545777bd8d852e821b245..de4e5c57746a093aadc0d87839e0757148fdf776 100644 (file)
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -2058,8 +2058,7 @@ ExtSaveArea x86_ext_save_areas[XSAVE_STATE_AREA_COUNT] = {
     },
     [XSTATE_ARCH_LBR_BIT] = {
         .feature = FEAT_7_0_EDX, .bits = CPUID_7_0_EDX_ARCH_LBR,
-        .offset = 0 /*supervisor mode component, offset = 0 */,
-        .size = sizeof(XSavesArchLBR),
+        .size = sizeof(XSaveArchLBR),
     },
     [XSTATE_XTILE_CFG_BIT] = {
         .feature = FEAT_7_0_EDX, .bits = CPUID_7_0_EDX_AMX_TILE,

diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index cee1f692a1c3b27c59e89455a38336dc209fe450..c95b772719ce958210061934a9289be84747f221 100644 (file)
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -1747,15 +1747,15 @@ typedef struct {
 
 #define ARCH_LBR_NR_ENTRIES            32
 
-/* Ext. save area 19: Supervisor mode Arch LBR state */
-typedef struct XSavesArchLBR {
+/* Ext. save area 15: Arch LBR state */
+typedef struct XSaveArchLBR {
     uint64_t lbr_ctl;
     uint64_t lbr_depth;
     uint64_t ler_from;
     uint64_t ler_to;
     uint64_t ler_info;
     LBREntry lbr_records[ARCH_LBR_NR_ENTRIES];
-} XSavesArchLBR;
+} XSaveArchLBR;
 
 QEMU_BUILD_BUG_ON(sizeof(XSaveAVX) != 0x100);
 QEMU_BUILD_BUG_ON(sizeof(XSaveBNDREG) != 0x40);
@@ -1766,7 +1766,7 @@ QEMU_BUILD_BUG_ON(sizeof(XSaveHi16_ZMM) != 0x400);
 QEMU_BUILD_BUG_ON(sizeof(XSavePKRU) != 0x8);
 QEMU_BUILD_BUG_ON(sizeof(XSaveXTILECFG) != 0x40);
 QEMU_BUILD_BUG_ON(sizeof(XSaveXTILEDATA) != 0x2000);
-QEMU_BUILD_BUG_ON(sizeof(XSavesArchLBR) != 0x328);
+QEMU_BUILD_BUG_ON(sizeof(XSaveArchLBR) != 0x328);
 
 typedef struct ExtSaveArea {
     uint32_t feature, bits;