Nothing new in Windows 10 build 19631.

A0661 - Comet Lake-U, stepping K1, hexa-core crystal.

Nothing new in Windows 10 build 19635.

Nothing new in Windows 10 build 19640.

!New_cpu406E3_platC0_ver000000DC_2020-04-27_PRD_459D4483.bin
!New_cpu50653_plat97_ver01000157_2020-04-24_PRD_D44BC2EB.bin
!New_cpu506E3_plat36_ver000000DC_2020-04-27_PRD_65F0B5D1.bin
!New_cpu806E9_plat10_ver000000D6_2020-04-27_PRD_9BEC442B.bin
!New_cpu806E9_platC0_ver000000D6_2020-04-27_PRD_C979B5EA.bin
!New_cpu806EA_platC0_ver000000D6_2020-04-27_PRD_D9DD064F.bin
!New_cpu806EB_platD0_ver000000D6_2020-04-27_PRD_21854E7E.bin
!New_cpu806EC_plat94_ver000000D6_2020-04-23_PRD_5B2D4D96.bin
!New_cpu906E9_plat2A_ver000000D6_2020-04-23_PRD_741B08C6.bin

https://github.com/intel/Intel-Linux-Pro...rocode-20200609

Special Register Buffer Data Sampling Advisory
-https://www.intel.com/content/www/us/en/...l-sa-00320.html

CVEID: CVE-2020-0543

Description: Incomplete cleanup from specific special register read operations in some Intel(R) Processors may allow an authenticated user to potentially enable information disclosure via local access.

CVSS Base Score: 6.5 Medium


HSW C0 6-3c-3/32 00000027->00000028 Core Gen4
BDW-U/Y E0/F0 6-3d-4/c0 0000002e->0000002f Core Gen5
HSW-U C0/D0 6-45-1/72 00000025->00000026 Core Gen4
HSW-H C0 6-46-1/32 0000001b->0000001c Core Gen4
BDW-H/E3 E0/G0 6-47-1/22 00000021->00000022 Core Gen5
SKL-U/Y D0 6-4e-3/c0 000000d6->000000dc Core Gen6 Mobile
SKL-U23e K1 6-4e-3/c0 000000d6->000000dc Core Gen6 Mobile
SKX-SP B1 6-55-3/97 01000151->01000157 Xeon Scalable
SKX-SP H0/M0/U0 6-55-4/b7 02000065->02006906 Xeon Scalable
SKX-D M1 6-55-4/b7 02000065->02006906 Xeon D-21xx
CLX-SP B0 6-55-6/bf 0400002c->04002f01 Xeon Scalable Gen2
CLX-SP B1 6-55-7/bf 0500002c->05002f01 Xeon Scalable Gen2
SKL-H/S R0/N0 6-5e-3/36 000000d6->000000dc Core Gen6; Xeon E3 v5
AML-Y22 H0 6-8e-9/10 000000ca->000000d6 Core Gen8 Mobile
KBL-U/Y H0 6-8e-9/c0 000000ca->000000d6 Core Gen7 Mobile
CFL-U43e D0 6-8e-a/c0 000000ca->000000d6 Core Gen8 Mobile
WHL-U W0 6-8e-b/d0 000000ca->000000d6 Core Gen8 Mobile
AML-Y42 V0 6-8e-c/94 000000ca->000000d6 Core Gen10 Mobile
CML-Y42 V0 6-8e-c/94 000000ca->000000d6 Core Gen10 Mobile
WHL-U V0 6-8e-c/94 000000ca->000000d6 Core Gen8 Mobile
KBL-G/H/S/E3 B0 6-9e-9/2a 000000ca->000000d6 Core Gen7; Xeon E3 v6
CFL-H/S/E3 U0 6-9e-a/22 000000ca->000000d6 Core Gen8 Desktop, Mobile, Xeon E
CFL-S B0 6-9e-b/02 000000ca->000000d6 Core Gen8
CFL-H/S P0 6-9e-c/22 000000ca->000000d6 Core Gen9
CFL-H R0 6-9e-d/22 000000ca->000000d6 Core Gen9 Mobile


@Marvin that was the reason for microcode 28 haswell finally!

On the LGA2066 (X299) platform with each new microcode, the performance collapses
I thought Intel had made an effort on that side...

https://software.intel.com/security-soft...r-data-sampling

So we finally know what bit 9 is:
RNGDS_MITG_DIS support is enumerated by CPUID.(EAX=07H,ECX=0).EDX[SRBDS_CTRL = 9]==1

Zitat von Marvin im Beitrag #384

---

Most likely to fix https://www.intel.com/content/www/us/en/...l-sa-00329.html

It is not public yet but I tested new 306C3 and it's now reporting a totally undocumented bit in CPUID:
27:
eax in: 0x00000007, eax = 00000000 ebx = 000027ab ecx = 00000000 edx = 9c000400
28:
eax in: 0x00000007, eax = 00000000 ebx = 000027ab ecx = 00000000 edx = 9c000600

EDX has changed from 9c000400 to 9c000600 meaning now an undocumented bit 9 is active.

Latest intel documentation about this is here:
https://software.intel.com/security-soft...hitectural-msrs
Bit 10: MD_CLEAR supported.
Bits 25-00: Reserved
Bit 26: IBRS and IBPB supported
Bit 27: STIBP supported
Bit 28: L1D_FLUSH supported
Bit 29: IA32_ARCH_CAPABILITIES supported
Bit 30: Reserved
Bit 31: SSBD supported

I bet in a few weeks we will know what Bit 9 means.

---

Zitat von tistou77 im Beitrag #446

---

On the LGA2066 (X299) platform with each new microcode, the performance collapses
I thought Intel had made an effort on that side...

---

@javanse

With 10980XE
Old microcode is better

Nothing new in Windows 10 build 19645.