From: Kristina Martsenko <kristina.martsenko@arm.com>
To: linux-arm-kernel@lists.infradead.org
Cc: Adam Wallis <awallis@codeaurora.org>,
Amit Kachhap <Amit.Kachhap@arm.com>,
Andrew Jones <drjones@redhat.com>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Arnd Bergmann <arnd@arndb.de>,
Catalin Marinas <catalin.marinas@arm.com>,
Christoffer Dall <christoffer.dall@arm.com>,
Dave P Martin <Dave.Martin@arm.com>,
Jacob Bramley <jacob.bramley@arm.com>,
Kees Cook <keescook@chromium.org>,
Marc Zyngier <marc.zyngier@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Ramana Radhakrishnan <ramana.radhakrishnan@arm.com>,
"Suzuki K . Poulose" <suzuki.poulose@arm.com>,
Will Deacon <will.deacon@arm.com>,
kvmarm@lists.cs.columbia.edu, linux-arch@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH v5 04/17] arm64: Don't trap host pointer auth use to EL2
Date: Fri, 5 Oct 2018 09:47:41 +0100 [thread overview]
Message-ID: <20181005084754.20950-5-kristina.martsenko@arm.com> (raw)
In-Reply-To: <20181005084754.20950-1-kristina.martsenko@arm.com>
From: Mark Rutland <mark.rutland@arm.com>
To allow EL0 (and/or EL1) to use pointer authentication functionality,
we must ensure that pointer authentication instructions and accesses to
pointer authentication keys are not trapped to EL2.
This patch ensures that HCR_EL2 is configured appropriately when the
kernel is booted at EL2. For non-VHE kernels we set HCR_EL2.{API,APK},
ensuring that EL1 can access keys and permit EL0 use of instructions.
For VHE kernels host EL0 (TGE && E2H) is unaffected by these settings,
and it doesn't matter how we configure HCR_EL2.{API,APK}, so we don't
bother setting them.
This does not enable support for KVM guests, since KVM manages HCR_EL2
itself when running VMs.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Kristina Martsenko <kristina.martsenko@arm.com>
Acked-by: Christoffer Dall <christoffer.dall@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: kvmarm@lists.cs.columbia.edu
---
arch/arm64/include/asm/kvm_arm.h | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h
index f885f4e96002..1405bb24acac 100644
--- a/arch/arm64/include/asm/kvm_arm.h
+++ b/arch/arm64/include/asm/kvm_arm.h
@@ -24,6 +24,8 @@
/* Hyp Configuration Register (HCR) bits */
#define HCR_FWB (UL(1) << 46)
+#define HCR_API (UL(1) << 41)
+#define HCR_APK (UL(1) << 40)
#define HCR_TEA (UL(1) << 37)
#define HCR_TERR (UL(1) << 36)
#define HCR_TLOR (UL(1) << 35)
@@ -87,7 +89,7 @@
HCR_AMO | HCR_SWIO | HCR_TIDCP | HCR_RW | HCR_TLOR | \
HCR_FMO | HCR_IMO)
#define HCR_VIRT_EXCP_MASK (HCR_VSE | HCR_VI | HCR_VF)
-#define HCR_HOST_NVHE_FLAGS (HCR_RW)
+#define HCR_HOST_NVHE_FLAGS (HCR_RW | HCR_API | HCR_APK)
#define HCR_HOST_VHE_FLAGS (HCR_RW | HCR_TGE | HCR_E2H)
/* TCR_EL2 Registers bits */
--
2.11.0
next prev parent reply other threads:[~2018-10-05 8:50 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-05 8:47 [PATCH 00/17] ARMv8.3 pointer authentication support Kristina Martsenko
2018-10-05 8:47 ` [PATCH v5 01/17] arm64: add pointer authentication register bits Kristina Martsenko
2018-10-11 16:28 ` Will Deacon
2018-10-12 8:53 ` Mark Rutland
2018-10-12 8:56 ` Will Deacon
2018-10-12 9:50 ` Mark Rutland
2018-10-05 8:47 ` [PATCH v5 02/17] arm64/kvm: consistently handle host HCR_EL2 flags Kristina Martsenko
2018-10-05 8:47 ` [PATCH v5 03/17] arm64/kvm: hide ptrauth from guests Kristina Martsenko
2018-10-05 8:47 ` Kristina Martsenko [this message]
2018-10-05 8:47 ` [PATCH v5 05/17] arm64/cpufeature: detect pointer authentication Kristina Martsenko
2018-10-05 8:47 ` [PATCH v5 06/17] asm-generic: mm_hooks: allow hooks to be overridden individually Kristina Martsenko
2018-10-05 8:47 ` [PATCH v5 07/17] arm64: add basic pointer authentication support Kristina Martsenko
2018-10-11 16:00 ` Suzuki K Poulose
2018-10-19 11:15 ` Catalin Marinas
2018-10-19 11:24 ` Will Deacon
2018-10-19 15:36 ` Kees Cook
2018-10-19 15:49 ` Will Deacon
2018-10-19 16:05 ` Kees Cook
2018-10-19 16:16 ` Will Deacon
2018-10-19 15:54 ` Mark Rutland
2018-10-19 16:49 ` Cyrill Gorcunov
2018-11-14 18:11 ` Will Deacon
2018-11-15 10:25 ` Dave Martin
2018-10-23 8:36 ` Ramana Radhakrishnan
2018-10-23 10:20 ` Will Deacon
2018-10-05 8:47 ` [PATCH v5 08/17] arm64: expose user PAC bit positions via ptrace Kristina Martsenko
2018-10-05 8:47 ` [PATCH v5 09/17] arm64: perf: strip PAC when unwinding userspace Kristina Martsenko
2018-10-05 8:47 ` [PATCH v5 10/17] arm64: enable pointer authentication Kristina Martsenko
2018-10-05 8:47 ` [PATCH v5 11/17] arm64: docs: document " Kristina Martsenko
2018-10-05 9:04 ` Ramana Radhakrishnan
2018-10-16 16:14 ` Kristina Martsenko
2018-10-19 11:35 ` Catalin Marinas
2018-10-19 11:47 ` Marc Zyngier
2018-10-19 12:22 ` Will Deacon
2018-10-19 14:42 ` Kristina Martsenko
2018-10-19 15:10 ` Catalin Marinas
2018-10-19 17:45 ` Will Deacon
2018-11-02 6:02 ` Jon Masters
2018-10-24 10:56 ` Ramana Radhakrishnan
2018-10-15 22:35 ` Kees Cook
2018-11-02 9:46 ` Ramana Radhakrishnan
2018-10-05 8:47 ` [RFC 12/17] arm64: move ptrauth keys to thread_info Kristina Martsenko
2018-10-19 11:38 ` Catalin Marinas
2018-10-05 8:47 ` [RFC 13/17] arm64: install user ptrauth keys at kernel exit time Kristina Martsenko
2018-10-05 8:47 ` [RFC 14/17] arm64: unwind: strip PAC from kernel addresses Kristina Martsenko
2018-10-05 8:47 ` [RFC 15/17] arm64: enable ptrauth earlier Kristina Martsenko
2018-10-06 12:51 ` Amit Kachhap
2018-10-05 8:47 ` [RFC 16/17] arm64: initialize and switch ptrauth kernel keys Kristina Martsenko
2018-10-06 12:56 ` Amit Kachhap
2018-10-05 8:47 ` [RFC 17/17] arm64: compile the kernel with ptrauth -msign-return-address Kristina Martsenko
2018-10-05 9:01 ` Ramana Radhakrishnan
2018-10-11 14:00 ` Kristina Martsenko
2018-10-11 14:23 ` Vladimir Murzin
2018-10-15 22:38 ` Kees Cook
2018-10-15 22:42 ` [PATCH 00/17] ARMv8.3 pointer authentication support Kees Cook
2018-11-13 16:17 ` Kristina Martsenko
2018-11-13 23:09 ` Kees Cook
2018-11-14 15:54 ` Kristina Martsenko
2018-11-14 21:47 ` Mark Rutland
2018-11-14 22:48 ` Kees Cook
2018-10-19 12:36 ` Will Deacon
2018-10-23 8:39 ` Ramana Radhakrishnan
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