[tip: x86/urgent] x86/CPU/AMD: Disable XSAVES on AMD family 0x17

["tip-bot2 for Andrew Cooper" <tip-bot2@linutronix.de>]

The following commit has been merged into the x86/urgent branch of tip:

Commit-ID:     b0563468eeac88ebc70559d52a0b66efc37e4e9d
Gitweb:        https://git.kernel.org/tip/b0563468eeac88ebc70559d52a0b66efc37e4e9d
Author:        Andrew Cooper <andrew.cooper3@citrix.com>
AuthorDate:    Tue, 07 Mar 2023 17:46:43 
Committer:     Borislav Petkov (AMD) <bp@alien8.de>
CommitterDate: Wed, 08 Mar 2023 16:56:08 +01:00

x86/CPU/AMD: Disable XSAVES on AMD family 0x17

AMD Erratum 1386 is summarised as:

  XSAVES Instruction May Fail to Save XMM Registers to the Provided
  State Save Area

This piece of accidental chronomancy causes the %xmm registers to
occasionally reset back to an older value.

Ignore the XSAVES feature on all AMD Zen1/2 hardware.  The XSAVEC
instruction (which works fine) is equivalent on affected parts.

  [ bp: Typos, move it into the F17h-specific function. ]

Reported-by: Tavis Ormandy <taviso@gmail.com>
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Cc: <stable@kernel.org>
Link: https://lore.kernel.org/r/20230307174643.1240184-1-andrew.cooper3@citrix.com
---
 arch/x86/kernel/cpu/amd.c |  9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index 380753b..95cdd08 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -880,6 +880,15 @@ void init_spectral_chicken(struct cpuinfo_x86 *c)
 		}
 	}
 #endif
+	/*
+	 * Work around Erratum 1386.  The XSAVES instruction malfunctions in
+	 * certain circumstances on Zen1/2 uarch, and not all parts have had
+	 * updated microcode at the time of writing (March 2023).
+	 *
+	 * Affected parts all have no supervisor XSAVE states, meaning that
+	 * the XSAVEC instruction (which works fine) is equivalent.
+	 */
+	clear_cpu_cap(c, X86_FEATURE_XSAVES);
 }
 
 static void init_amd_zn(struct cpuinfo_x86 *c)