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From: Marc Zyngier <maz@kernel.org>
To: linux-arm-kernel@lists.infradead.org,
	kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org
Cc: Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	David Brazdil <dbrazdil@google.com>,
	Alexandru Elisei <alexandru.elisei@arm.com>,
	Ard Biesheuvel <ardb@kernel.org>,
	Jing Zhang <jingzhangos@google.com>,
	Ajay Patil <pajay@qti.qualcomm.com>,
	Prasad Sodagudi <psodagud@codeaurora.org>,
	Srinivas Ramana <sramana@codeaurora.org>,
	Hector Martin <marcan@marcan.st>,
	James Morse <james.morse@arm.com>,
	Julien Thierry <julien.thierry.kdev@gmail.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	kernel-team@android.com
Subject: [PATCH v7 15/23] arm64: Honor VHE being disabled from the command-line
Date: Mon,  8 Feb 2021 09:57:24 +0000	[thread overview]
Message-ID: <20210208095732.3267263-16-maz@kernel.org> (raw)
In-Reply-To: <20210208095732.3267263-1-maz@kernel.org>

Finally we can check whether VHE is disabled on the command line,
and not enable it if that's the user's wish.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Acked-by: David Brazdil <dbrazdil@google.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
---
 arch/arm64/kernel/asm-offsets.c |  3 +++
 arch/arm64/kernel/hyp-stub.S    | 11 +++++++++++
 2 files changed, 14 insertions(+)

diff --git a/arch/arm64/kernel/asm-offsets.c b/arch/arm64/kernel/asm-offsets.c
index f42fd9e33981..1add0f21bffe 100644
--- a/arch/arm64/kernel/asm-offsets.c
+++ b/arch/arm64/kernel/asm-offsets.c
@@ -99,6 +99,9 @@ int main(void)
   DEFINE(CPU_BOOT_STACK,	offsetof(struct secondary_data, stack));
   DEFINE(CPU_BOOT_TASK,		offsetof(struct secondary_data, task));
   BLANK();
+  DEFINE(FTR_OVR_VAL_OFFSET,	offsetof(struct arm64_ftr_override, val));
+  DEFINE(FTR_OVR_MASK_OFFSET,	offsetof(struct arm64_ftr_override, mask));
+  BLANK();
 #ifdef CONFIG_KVM
   DEFINE(VCPU_CONTEXT,		offsetof(struct kvm_vcpu, arch.ctxt));
   DEFINE(VCPU_FAULT_DISR,	offsetof(struct kvm_vcpu, arch.fault.disr_el1));
diff --git a/arch/arm64/kernel/hyp-stub.S b/arch/arm64/kernel/hyp-stub.S
index 6229315d533d..3e08dcc924b5 100644
--- a/arch/arm64/kernel/hyp-stub.S
+++ b/arch/arm64/kernel/hyp-stub.S
@@ -87,6 +87,17 @@ SYM_CODE_START_LOCAL(mutate_to_vhe)
 	ubfx	x1, x1, #ID_AA64MMFR1_VHE_SHIFT, #4
 	cbz	x1, 1f
 
+	// Check whether VHE is disabled from the command line
+	adr_l	x1, id_aa64mmfr1_override
+	ldr	x2, [x1, FTR_OVR_VAL_OFFSET]
+	ldr	x1, [x1, FTR_OVR_MASK_OFFSET]
+	ubfx	x2, x2, #ID_AA64MMFR1_VHE_SHIFT, #4
+	ubfx	x1, x1, #ID_AA64MMFR1_VHE_SHIFT, #4
+	cmp	x1, xzr
+	and	x2, x2, x1
+	csinv	x2, x2, xzr, ne
+	cbz	x2, 1f
+
 	// Engage the VHE magic!
 	mov_q	x0, HCR_HOST_VHE_FLAGS
 	msr	hcr_el2, x0
-- 
2.29.2


  parent reply	other threads:[~2021-02-08 10:23 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-08  9:57 [PATCH v7 00/23] arm64: Early CPU feature override, and applications to VHE, BTI and PAuth Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 01/23] arm64: Fix labels in el2_setup macros Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 02/23] arm64: Fix outdated TCR setup comment Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 03/23] arm64: Turn the MMU-on sequence into a macro Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 04/23] arm64: Provide an 'upgrade to VHE' stub hypercall Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 05/23] arm64: Initialise as nVHE before switching to VHE Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 06/23] arm64: Drop early setting of MDSCR_EL2.TPMS Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 07/23] arm64: Move VHE-specific SPE setup to mutate_to_vhe() Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 08/23] arm64: Simplify init_el2_state to be non-VHE only Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 09/23] arm64: Move SCTLR_EL1 initialisation to EL-agnostic code Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 10/23] arm64: cpufeature: Add global feature override facility Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 11/23] arm64: cpufeature: Use IDreg override in __read_sysreg_by_encoding() Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 12/23] arm64: Extract early FDT mapping from kaslr_early_init() Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 13/23] arm64: cpufeature: Add an early command-line cpufeature override facility Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 14/23] arm64: Allow ID_AA64MMFR1_EL1.VH to be overridden from the command line Marc Zyngier
2021-02-08  9:57 ` Marc Zyngier [this message]
2021-02-08  9:57 ` [PATCH v7 16/23] arm64: Add an aliasing facility for the idreg override Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 17/23] arm64: Make kvm-arm.mode={nvhe, protected} an alias of id_aa64mmfr1.vh=0 Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 18/23] KVM: arm64: Document HVC_VHE_RESTART stub hypercall Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 19/23] arm64: Move "nokaslr" over to the early cpufeature infrastructure Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 20/23] arm64: cpufeatures: Allow disabling of BTI from the command-line Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 21/23] arm64: Defer enabling pointer authentication on boot core Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 22/23] arm64: cpufeatures: Allow disabling of Pointer Auth from the command-line Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 23/23] [DO NOT MERGE] arm64: Cope with CPUs stuck in VHE mode Marc Zyngier
2021-02-22  9:35   ` Jonathan Neuschäfer
2021-02-22  9:47     ` Marc Zyngier
2021-02-08 14:32 ` [PATCH v7 00/23] arm64: Early CPU feature override, and applications to VHE, BTI and PAuth Will Deacon
2021-02-08 14:40   ` Ard Biesheuvel
2021-02-08 15:02   ` Marc Zyngier
2021-02-08 16:30   ` Marc Zyngier

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