[lkml]   [2018]   [Oct]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[PATCH v3 6/7] arm64: docs: document KVM support of pointer authentication
The documentation is updated to help in using pointer authentication
for KVM guests.

Signed-off-by: Amit Daniel Kachhap <>
Cc: Mark Rutland <>
Cc: Christoffer Dall <>
Cc: Marc Zyngier <>
Documentation/arm64/pointer-authentication.txt | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/Documentation/arm64/pointer-authentication.txt b/Documentation/arm64/pointer-authentication.txt
index 8a9cb57..b00d735 100644
--- a/Documentation/arm64/pointer-authentication.txt
+++ b/Documentation/arm64/pointer-authentication.txt
@@ -78,7 +78,13 @@ to TTBR1 addresses (e.g. kernel pointers).

-Pointer authentication is not currently supported in KVM guests. KVM
+Pointer authentication is enabled in KVM guest when virtual machine is
+created by passing a flag requesting this feature to be enabled. Without
+this flag, pointer authentication is not enabled in KVM guests and KVM
will mask the feature bits from ID_AA64ISAR1_EL1, and attempted use of
the feature will result in an UNDEFINED exception being injected into
the guest.
+The flag to enable this feature is KVM_ARM_VCPU_PTRAUTH and should be
+used in KVM API KVM_ARM_VCPU_INIT. The pointer authentication key
+registers are hidden from userspace if this feature is not enabled.
 \ /
  Last update: 2018-10-17 12:49    [W:0.086 / U:1.224 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site