From: Marc Zyngier <maz@kernel.org>
To: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org,
kvm@vger.kernel.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>,
Joey Gouly <joey.gouly@arm.com>,
Alexandru Elisei <alexandru.elisei@arm.com>,
Anshuman Khandual <anshuman.khandual@arm.com>,
Przemyslaw Gaj <pgaj@cadence.com>
Subject: [PATCH v4 03/18] arm64: Add system register encoding for PSTATE.PAN
Date: Tue, 20 Aug 2024 11:37:41 +0100 [thread overview]
Message-ID: <20240820103756.3545976-4-maz@kernel.org> (raw)
In-Reply-To: <20240820103756.3545976-1-maz@kernel.org>
Although we already have the primitives to set PSTATE.PAN with an
immediate, we don't have a way to read the current state nor set
it ot an arbitrary value (i.e. we can generally save/restore it).
Thankfully, all that is missing for this is the definition for
the PAN pseudo system register, here named SYS_PSTATE_PAN.
Signed-off-by: Marc Zyngier <maz@kernel.org>
---
arch/arm64/include/asm/sysreg.h | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h
index d9d5e07f768d..a2787091d5a0 100644
--- a/arch/arm64/include/asm/sysreg.h
+++ b/arch/arm64/include/asm/sysreg.h
@@ -109,6 +109,9 @@
#define set_pstate_ssbs(x) asm volatile(SET_PSTATE_SSBS(x))
#define set_pstate_dit(x) asm volatile(SET_PSTATE_DIT(x))
+/* Register-based PAN access, for save/restore purposes */
+#define SYS_PSTATE_PAN sys_reg(3, 0, 4, 2, 3)
+
#define __SYS_BARRIER_INSN(CRm, op2, Rt) \
__emit_inst(0xd5000000 | sys_insn(0, 3, 3, (CRm), (op2)) | ((Rt) & 0x1f))
--
2.39.2
next prev parent reply other threads:[~2024-08-20 10:44 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-08-20 10:37 [PATCH v4 00/18] KVM: arm64: nv: Add support for address translation instructions Marc Zyngier
2024-08-20 10:37 ` [PATCH v4 01/18] arm64: Add missing APTable and TCR_ELx.HPD masks Marc Zyngier
2024-08-20 10:37 ` [PATCH v4 02/18] arm64: Add PAR_EL1 field description Marc Zyngier
2024-08-20 10:37 ` Marc Zyngier [this message]
2024-08-20 10:37 ` [PATCH v4 04/18] arm64: Add ESR_ELx_FSC_ADDRSZ_L() helper Marc Zyngier
2024-08-20 10:37 ` [PATCH v4 05/18] KVM: arm64: Make kvm_at() take an OP_AT_* Marc Zyngier
2024-08-20 10:37 ` [PATCH v4 06/18] KVM: arm64: nv: Enforce S2 alignment when contiguous bit is set Marc Zyngier
2024-08-20 10:37 ` [PATCH v4 07/18] KVM: arm64: nv: Turn upper_attr for S2 walk into the full descriptor Marc Zyngier
2024-08-20 10:37 ` [PATCH v4 08/18] KVM: arm64: nv: Honor absence of FEAT_PAN2 Marc Zyngier
2024-08-20 10:37 ` [PATCH v4 09/18] KVM: arm64: nv: Add basic emulation of AT S1E{0,1}{R,W} Marc Zyngier
2024-08-20 10:37 ` [PATCH v4 10/18] KVM: arm64: nv: Add basic emulation of AT S1E1{R,W}P Marc Zyngier
2024-08-20 10:37 ` [PATCH v4 11/18] KVM: arm64: nv: Add basic emulation of AT S1E2{R,W} Marc Zyngier
2024-08-20 10:37 ` [PATCH v4 12/18] KVM: arm64: nv: Add emulation of AT S12E{0,1}{R,W} Marc Zyngier
2024-08-20 10:37 ` [PATCH v4 13/18] KVM: arm64: nv: Make ps_to_output_size() generally available Marc Zyngier
2024-08-20 10:37 ` [PATCH v4 14/18] KVM: arm64: nv: Add SW walker for AT S1 emulation Marc Zyngier
2024-08-20 10:37 ` [PATCH v4 15/18] KVM: arm64: nv: Sanitise SCTLR_EL1.EPAN according to VM configuration Marc Zyngier
2024-08-20 10:37 ` [PATCH v4 16/18] KVM: arm64: nv: Make AT+PAN instructions aware of FEAT_PAN3 Marc Zyngier
2024-08-20 10:37 ` [PATCH v4 17/18] KVM: arm64: nv: Plumb handling of AT S1* traps from EL2 Marc Zyngier
2024-08-20 10:37 ` [PATCH v4 18/18] KVM: arm64: nv: Add support for FEAT_ATS1A Marc Zyngier
2024-08-21 4:25 ` [PATCH v4 00/18] KVM: arm64: nv: Add support for address translation instructions Ganapatrao Kulkarni
2024-08-21 7:02 ` Oliver Upton
2024-08-21 9:28 ` Ganapatrao Kulkarni
2024-08-30 20:01 ` Marc Zyngier
2024-08-30 20:09 ` Marc Zyngier
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