linux-arm-kernel.lists.infradead.org archive mirror
 help / color / mirror / Atom feed
From: Marc Zyngier <maz@kernel.org>
To: kvmarm@lists.linux.dev, kvm@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org
Cc: James Morse <james.morse@arm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Oliver Upton <oliver.upton@linux.dev>,
	Zenghui Yu <yuzenghui@huawei.com>, Will Deacon <will@kernel.org>,
	Catalin Marinas <catalin.marinas@arm.com>
Subject: [PATCH 10/13] KVM: arm64: nv: Add kvm_has_pauth() helper
Date: Mon, 19 Feb 2024 09:20:11 +0000	[thread overview]
Message-ID: <20240219092014.783809-11-maz@kernel.org> (raw)
In-Reply-To: <20240219092014.783809-1-maz@kernel.org>

Pointer Authentication comes in many flavors, and a faithful emulation
relies on correctly handling the flavour implemented by the HW.

For this, provide a new kvm_has_pauth() that checks whether we
expose to the guest a particular level of support. This checks
across all 3 possible authentication algorithms (Q5, Q3 and IMPDEF).

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/include/asm/kvm_host.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 75eb8e170515..a97b092b7064 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -1334,4 +1334,19 @@ bool kvm_arm_vcpu_stopped(struct kvm_vcpu *vcpu);
 	(get_idreg_field((kvm), id, fld) >= expand_field_sign(id, fld, min) && \
 	 get_idreg_field((kvm), id, fld) <= expand_field_sign(id, fld, max))
 
+/* Check for a given level of PAuth support */
+#define kvm_has_pauth(k, l)						\
+	({								\
+		bool pa, pi, pa3;					\
+									\
+		pa  = kvm_has_feat((k), ID_AA64ISAR1_EL1, APA, l);	\
+		pa &= kvm_has_feat((k), ID_AA64ISAR1_EL1, GPA, IMP);	\
+		pi  = kvm_has_feat((k), ID_AA64ISAR1_EL1, API, l);	\
+		pi &= kvm_has_feat((k), ID_AA64ISAR1_EL1, GPI, IMP);	\
+		pa3  = kvm_has_feat((k), ID_AA64ISAR2_EL1, APA3, l);	\
+		pa3 &= kvm_has_feat((k), ID_AA64ISAR2_EL1, GPA3, IMP);	\
+									\
+		(pa + pi + pa3) == 1;					\
+	})
+
 #endif /* __ARM64_KVM_HOST_H__ */
-- 
2.39.2


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  parent reply	other threads:[~2024-02-19  9:21 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-02-19  9:20 [PATCH 00/13] KVM/arm64: Add NV support for ERET and PAuth Marc Zyngier
2024-02-19  9:20 ` [PATCH 01/13] KVM: arm64: Harden __ctxt_sys_reg() against out-of-range values Marc Zyngier
2024-02-20 11:20   ` Joey Gouly
2024-02-20 11:57     ` Marc Zyngier
2024-02-20 13:17       ` Joey Gouly
2024-02-19  9:20 ` [PATCH 02/13] KVM: arm64: Clarify ESR_ELx_ERET_ISS_ERET* Marc Zyngier
2024-02-20 11:31   ` Joey Gouly
2024-02-20 12:29     ` Marc Zyngier
2024-02-20 13:23       ` Joey Gouly
2024-02-20 13:41         ` Marc Zyngier
2024-02-20 15:18           ` Joey Gouly
2024-02-19  9:20 ` [PATCH 03/13] KVM: arm64: nv: Drop VCPU_HYP_CONTEXT flag Marc Zyngier
2024-02-20 11:58   ` Joey Gouly
2024-02-19  9:20 ` [PATCH 04/13] KVM: arm64: nv: Configure HCR_EL2 for FEAT_NV2 Marc Zyngier
2024-02-20 15:16   ` Joey Gouly
2024-02-20 15:41     ` Marc Zyngier
2024-02-19  9:20 ` [PATCH 05/13] KVM: arm64: nv: Add trap forwarding for ERET and SMC Marc Zyngier
2024-02-22 11:05   ` Joey Gouly
2024-02-19  9:20 ` [PATCH 06/13] KVM: arm64: nv: Fast-track 'InHost' exception returns Marc Zyngier
2024-02-19  9:20 ` [PATCH 07/13] KVM: arm64: nv: Honor HFGITR_EL2.ERET being set Marc Zyngier
2024-02-19  9:20 ` [PATCH 08/13] KVM: arm64: nv: Handle HCR_EL2.{API,APK} independantly Marc Zyngier
2024-02-19  9:20 ` [PATCH 09/13] KVM: arm64: nv: Reinject PAC exceptions caused by HCR_EL2.API==0 Marc Zyngier
2024-02-19  9:20 ` Marc Zyngier [this message]
2024-02-19  9:20 ` [PATCH 11/13] KVM: arm64: nv: Add emulation for ERETAx instructions Marc Zyngier
2024-02-19  9:20 ` [PATCH 12/13] KVM: arm64: nv: Handle ERETA[AB] instructions Marc Zyngier
2024-02-19  9:20 ` [PATCH 13/13] KVM: arm64: nv: Advertise support for PAuth Marc Zyngier

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20240219092014.783809-11-maz@kernel.org \
    --to=maz@kernel.org \
    --cc=catalin.marinas@arm.com \
    --cc=james.morse@arm.com \
    --cc=kvm@vger.kernel.org \
    --cc=kvmarm@lists.linux.dev \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=oliver.upton@linux.dev \
    --cc=suzuki.poulose@arm.com \
    --cc=will@kernel.org \
    --cc=yuzenghui@huawei.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).