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[for-stable-v4.19,04/16] arm64: docs: Document SSBS HWCAP

Message ID 20191008153930.15386-5-ard.biesheuvel@linaro.org (mailing list archive)
State New, archived
Headers show
Series arm64 spec mitigation backports | expand

Commit Message

Ard Biesheuvel Oct. 8, 2019, 3:39 p.m. UTC 
From: Will Deacon <will.deacon@arm.com>

[ Upstream commit ee91176120bd584aa10c564e7e9fdcaf397190a1 ]

We advertise the MRS/MSR instructions for toggling SSBS at EL0 using an
HWCAP, so document it along with the others.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
 Documentation/arm64/elf_hwcaps.txt | 4 ++++
 1 file changed, 4 insertions(+)
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Patch

diff --git a/Documentation/arm64/elf_hwcaps.txt b/Documentation/arm64/elf_hwcaps.txt
index d6aff2c5e9e2..6feaffe90e22 100644
--- a/Documentation/arm64/elf_hwcaps.txt
+++ b/Documentation/arm64/elf_hwcaps.txt
@@ -178,3 +178,7 @@  HWCAP_ILRCPC
 HWCAP_FLAGM
 
     Functionality implied by ID_AA64ISAR0_EL1.TS == 0b0001.
+
+HWCAP_SSBS
+
+    Functionality implied by ID_AA64PFR1_EL1.SSBS == 0b0010.