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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: Mark Rutland <mark.rutland@arm.com>,
	Jing Zhang <jingzhangos@google.com>,
	Prasad Sodagudi <psodagud@codeaurora.org>,
	Srinivas Ramana <sramana@codeaurora.org>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Alexandru Elisei <alexandru.elisei@arm.com>,
	James Morse <james.morse@arm.com>,
	Ajay Patil <pajay@qti.qualcomm.com>,
	kernel-team@android.com, David Brazdil <dbrazdil@google.com>,
	Will Deacon <will@kernel.org>, Ard Biesheuvel <ardb@kernel.org>,
	Julien Thierry <julien.thierry.kdev@gmail.com>
Subject: [PATCH v4 14/21] arm64: Honor VHE being disabled from the command-line
Date: Mon, 18 Jan 2021 09:45:26 +0000	[thread overview]
Message-ID: <20210118094533.2874082-15-maz@kernel.org> (raw)
In-Reply-To: <20210118094533.2874082-1-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>
---
 arch/arm64/kernel/hyp-stub.S | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/kernel/hyp-stub.S b/arch/arm64/kernel/hyp-stub.S
index 59820f9b8522..bbab2148a2a2 100644
--- a/arch/arm64/kernel/hyp-stub.S
+++ b/arch/arm64/kernel/hyp-stub.S
@@ -77,13 +77,24 @@ SYM_CODE_END(el1_sync)
 SYM_CODE_START_LOCAL(mutate_to_vhe)
 	// Sanity check: MMU *must* be off
 	mrs	x0, sctlr_el2
-	tbnz	x0, #0, 1f
+	tbnz	x0, #0, 2f
 
 	// Needs to be VHE capable, obviously
 	mrs	x0, id_aa64mmfr1_el1
 	ubfx	x0, x0, #ID_AA64MMFR1_VHE_SHIFT, #4
-	cbz	x0, 1f
+	cbz	x0, 2f
 
+	// Check whether VHE is disabled from the command line
+	adr_l	x1, id_aa64mmfr1_val
+	ldr	x0, [x1]
+	adr_l	x1, id_aa64mmfr1_mask
+	ldr	x1, [x1]
+	ubfx	x0, x0, #ID_AA64MMFR1_VHE_SHIFT, #4
+	ubfx	x1, x1, #ID_AA64MMFR1_VHE_SHIFT, #4
+	cbz	x1, 1f
+	and	x0, x0, x1
+	cbz	x0, 2f
+1:
 	// Engage the VHE magic!
 	mov_q	x0, HCR_HOST_VHE_FLAGS
 	msr	hcr_el2, x0
@@ -152,7 +163,7 @@ skip_spe:
 	orr	x0, x0, x1
 	msr	spsr_el1, x0
 
-1:	eret
+2:	eret
 SYM_CODE_END(mutate_to_vhe)
 
 .macro invalid_vector	label
-- 
2.29.2


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  parent reply	other threads:[~2021-01-18 10:02 UTC|newest]

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-18  9:45 [PATCH v4 00/21] arm64: Early CPU feature override, and applications to VHE, BTI and PAuth Marc Zyngier
2021-01-18  9:45 ` [PATCH v4 01/21] arm64: Fix labels in el2_setup macros Marc Zyngier
2021-01-18 11:13   ` David Brazdil
2021-01-18  9:45 ` [PATCH v4 02/21] arm64: Fix outdated TCR setup comment Marc Zyngier
2021-01-20 18:18   ` Catalin Marinas
2021-01-18  9:45 ` [PATCH v4 03/21] arm64: Turn the MMU-on sequence into a macro Marc Zyngier
2021-01-20 18:18   ` Catalin Marinas
2021-01-18  9:45 ` [PATCH v4 04/21] arm64: Provide an 'upgrade to VHE' stub hypercall Marc Zyngier
2021-01-18 11:25   ` David Brazdil
2021-01-24 18:44     ` Marc Zyngier
2021-01-18  9:45 ` [PATCH v4 05/21] arm64: Initialise as nVHE before switching to VHE Marc Zyngier
2021-01-18  9:45 ` [PATCH v4 06/21] arm64: Move VHE-specific SPE setup to mutate_to_vhe() Marc Zyngier
2021-01-18  9:45 ` [PATCH v4 07/21] arm64: Simplify init_el2_state to be non-VHE only Marc Zyngier
2021-01-18  9:45 ` [PATCH v4 08/21] arm64: Move SCTLR_EL1 initialisation to EL-agnostic code Marc Zyngier
2021-01-20 18:35   ` Catalin Marinas
2021-01-18  9:45 ` [PATCH v4 09/21] arm64: cpufeature: Add global feature override facility Marc Zyngier
2021-01-22 18:41   ` Catalin Marinas
2021-01-23 15:59   ` Suzuki K Poulose
2021-01-18  9:45 ` [PATCH v4 10/21] arm64: cpufeature: Use IDreg override in __read_sysreg_by_encoding() Marc Zyngier
2021-01-22 18:53   ` Catalin Marinas
2021-01-23 16:04     ` Suzuki K Poulose
2021-01-18  9:45 ` [PATCH v4 11/21] arm64: Extract early FDT mapping from kaslr_early_init() Marc Zyngier
2021-01-22 18:55   ` Catalin Marinas
2021-01-23 13:25   ` Catalin Marinas
2021-01-18  9:45 ` [PATCH v4 12/21] arm64: cpufeature: Add an early command-line cpufeature override facility Marc Zyngier
2021-01-18 13:07   ` David Brazdil
2021-01-23 13:23   ` Catalin Marinas
2021-01-23 13:43   ` Catalin Marinas
2021-01-24 16:21     ` Marc Zyngier
2021-01-18  9:45 ` [PATCH v4 13/21] arm64: Allow ID_AA64MMFR1_EL1.VH to be overridden from the command line Marc Zyngier
2021-01-23 14:04   ` Catalin Marinas
2021-01-18  9:45 ` Marc Zyngier [this message]
2021-01-18 13:14   ` [PATCH v4 14/21] arm64: Honor VHE being disabled from the command-line David Brazdil
2021-01-23 14:07   ` Catalin Marinas
2021-01-24 15:59     ` Marc Zyngier
2021-01-18  9:45 ` [PATCH v4 15/21] arm64: Add an aliasing facility for the idreg override Marc Zyngier
2021-01-18 13:18   ` David Brazdil
2021-01-24 19:01     ` Marc Zyngier
2021-01-23 14:12   ` Catalin Marinas
2021-01-18  9:45 ` [PATCH v4 16/21] arm64: Make kvm-arm.mode={nvhe, protected} an alias of id_aa64mmfr1.vh=0 Marc Zyngier
2021-01-23 14:15   ` [PATCH v4 16/21] arm64: Make kvm-arm.mode={nvhe,protected} " Catalin Marinas
2021-01-18  9:45 ` [PATCH v4 17/21] KVM: arm64: Document HVC_VHE_RESTART stub hypercall Marc Zyngier
2021-01-18 13:29   ` David Brazdil
2021-01-18  9:45 ` [PATCH v4 18/21] arm64: Move "nokaslr" over to the early cpufeature infrastructure Marc Zyngier
2021-01-18 14:46   ` David Brazdil
2021-01-24 18:41     ` Marc Zyngier
2021-01-23 14:19   ` Catalin Marinas
2021-01-18  9:45 ` [PATCH v4 19/21] arm64: cpufeatures: Allow disabling of BTI from the command-line Marc Zyngier
2021-01-23 14:24   ` Catalin Marinas
2021-01-18  9:45 ` [PATCH v4 20/21] arm64: Defer enabling pointer authentication on boot core Marc Zyngier
2021-01-23 14:26   ` Catalin Marinas
2021-01-18  9:45 ` [PATCH v4 21/21] arm64: cpufeatures: Allow disabling of Pointer Auth from the command-line Marc Zyngier
2021-01-23 14:28   ` Catalin Marinas
2021-01-18 14:54 ` [PATCH v4 00/21] arm64: Early CPU feature override, and applications to VHE, BTI and PAuth David Brazdil

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