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From: Marc Zyngier <maz@kernel.org>
To: Quentin Perret <qperret@google.com>
Cc: catalin.marinas@arm.com, james.morse@arm.com,
	julien.thierry.kdev@gmail.com, suzuki.poulose@arm.com,
	android-kvm@google.com, seanjc@google.com, mate.toth-pal@arm.com,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, kernel-team@android.com,
	kvmarm@lists.cs.columbia.edu, tabba@google.com, ardb@kernel.org,
	mark.rutland@arm.com, dbrazdil@google.com
Subject: [PATCH 2/3] KVM: arm64: Generate final CTR_EL0 value when running in Protected mode
Date: Mon, 22 Mar 2021 16:48:27 +0000	[thread overview]
Message-ID: <20210322164828.800662-3-maz@kernel.org> (raw)
In-Reply-To: <20210322164828.800662-1-maz@kernel.org>

In protected mode, late CPUs are not allowed to boot (enforced by
the PSCI relay). We can thus specialise the read_ctr macro to
always return a pre-computed, sanitised value.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/include/asm/assembler.h | 9 +++++++++
 arch/arm64/kernel/image-vars.h     | 1 +
 arch/arm64/kvm/va_layout.c         | 7 +++++++
 3 files changed, 17 insertions(+)

diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h
index fb651c1f26e9..1a4cee7eb3c9 100644
--- a/arch/arm64/include/asm/assembler.h
+++ b/arch/arm64/include/asm/assembler.h
@@ -270,12 +270,21 @@ alternative_endif
  * provide the system wide safe value from arm64_ftr_reg_ctrel0.sys_val
  */
 	.macro	read_ctr, reg
+#ifndef __KVM_NVHE_HYPERVISOR__
 alternative_if_not ARM64_MISMATCHED_CACHE_TYPE
 	mrs	\reg, ctr_el0			// read CTR
 	nop
 alternative_else
 	ldr_l	\reg, arm64_ftr_reg_ctrel0 + ARM64_FTR_SYSVAL
 alternative_endif
+#else
+alternative_cb kvm_compute_final_ctr_el0
+	movz	\reg, #0
+	movk	\reg, #0, lsl #16
+	movk	\reg, #0, lsl #32
+	movk	\reg, #0, lsl #48
+alternative_cb_end
+#endif
 	.endm
 
 
diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h
index d5dc2b792651..fdd60cd1d7e8 100644
--- a/arch/arm64/kernel/image-vars.h
+++ b/arch/arm64/kernel/image-vars.h
@@ -65,6 +65,7 @@ __efistub__ctype		= _ctype;
 KVM_NVHE_ALIAS(kvm_patch_vector_branch);
 KVM_NVHE_ALIAS(kvm_update_va_mask);
 KVM_NVHE_ALIAS(kvm_get_kimage_voffset);
+KVM_NVHE_ALIAS(kvm_compute_final_ctr_el0);
 
 /* Global kernel state accessed by nVHE hyp code. */
 KVM_NVHE_ALIAS(kvm_vgic_global_state);
diff --git a/arch/arm64/kvm/va_layout.c b/arch/arm64/kvm/va_layout.c
index 978301392d67..acdb7b3cc97d 100644
--- a/arch/arm64/kvm/va_layout.c
+++ b/arch/arm64/kvm/va_layout.c
@@ -288,3 +288,10 @@ void kvm_get_kimage_voffset(struct alt_instr *alt,
 {
 	generate_mov_q(kimage_voffset, origptr, updptr, nr_inst);
 }
+
+void kvm_compute_final_ctr_el0(struct alt_instr *alt,
+			       __le32 *origptr, __le32 *updptr, int nr_inst)
+{
+	generate_mov_q(read_sanitised_ftr_reg(SYS_CTR_EL0),
+		       origptr, updptr, nr_inst);
+}
-- 
2.29.2


WARNING: multiple messages have this Message-ID (diff)
From: Marc Zyngier <maz@kernel.org>
To: Quentin Perret <qperret@google.com>
Cc: android-kvm@google.com, catalin.marinas@arm.com,
	mate.toth-pal@arm.com, tabba@google.com,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, seanjc@google.com,
	kernel-team@android.com, kvmarm@lists.cs.columbia.edu
Subject: [PATCH 2/3] KVM: arm64: Generate final CTR_EL0 value when running in Protected mode
Date: Mon, 22 Mar 2021 16:48:27 +0000	[thread overview]
Message-ID: <20210322164828.800662-3-maz@kernel.org> (raw)
In-Reply-To: <20210322164828.800662-1-maz@kernel.org>

In protected mode, late CPUs are not allowed to boot (enforced by
the PSCI relay). We can thus specialise the read_ctr macro to
always return a pre-computed, sanitised value.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/include/asm/assembler.h | 9 +++++++++
 arch/arm64/kernel/image-vars.h     | 1 +
 arch/arm64/kvm/va_layout.c         | 7 +++++++
 3 files changed, 17 insertions(+)

diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h
index fb651c1f26e9..1a4cee7eb3c9 100644
--- a/arch/arm64/include/asm/assembler.h
+++ b/arch/arm64/include/asm/assembler.h
@@ -270,12 +270,21 @@ alternative_endif
  * provide the system wide safe value from arm64_ftr_reg_ctrel0.sys_val
  */
 	.macro	read_ctr, reg
+#ifndef __KVM_NVHE_HYPERVISOR__
 alternative_if_not ARM64_MISMATCHED_CACHE_TYPE
 	mrs	\reg, ctr_el0			// read CTR
 	nop
 alternative_else
 	ldr_l	\reg, arm64_ftr_reg_ctrel0 + ARM64_FTR_SYSVAL
 alternative_endif
+#else
+alternative_cb kvm_compute_final_ctr_el0
+	movz	\reg, #0
+	movk	\reg, #0, lsl #16
+	movk	\reg, #0, lsl #32
+	movk	\reg, #0, lsl #48
+alternative_cb_end
+#endif
 	.endm
 
 
diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h
index d5dc2b792651..fdd60cd1d7e8 100644
--- a/arch/arm64/kernel/image-vars.h
+++ b/arch/arm64/kernel/image-vars.h
@@ -65,6 +65,7 @@ __efistub__ctype		= _ctype;
 KVM_NVHE_ALIAS(kvm_patch_vector_branch);
 KVM_NVHE_ALIAS(kvm_update_va_mask);
 KVM_NVHE_ALIAS(kvm_get_kimage_voffset);
+KVM_NVHE_ALIAS(kvm_compute_final_ctr_el0);
 
 /* Global kernel state accessed by nVHE hyp code. */
 KVM_NVHE_ALIAS(kvm_vgic_global_state);
diff --git a/arch/arm64/kvm/va_layout.c b/arch/arm64/kvm/va_layout.c
index 978301392d67..acdb7b3cc97d 100644
--- a/arch/arm64/kvm/va_layout.c
+++ b/arch/arm64/kvm/va_layout.c
@@ -288,3 +288,10 @@ void kvm_get_kimage_voffset(struct alt_instr *alt,
 {
 	generate_mov_q(kimage_voffset, origptr, updptr, nr_inst);
 }
+
+void kvm_compute_final_ctr_el0(struct alt_instr *alt,
+			       __le32 *origptr, __le32 *updptr, int nr_inst)
+{
+	generate_mov_q(read_sanitised_ftr_reg(SYS_CTR_EL0),
+		       origptr, updptr, nr_inst);
+}
-- 
2.29.2

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

WARNING: multiple messages have this Message-ID (diff)
From: Marc Zyngier <maz@kernel.org>
To: Quentin Perret <qperret@google.com>
Cc: catalin.marinas@arm.com, james.morse@arm.com,
	julien.thierry.kdev@gmail.com, suzuki.poulose@arm.com,
	android-kvm@google.com, seanjc@google.com, mate.toth-pal@arm.com,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, kernel-team@android.com,
	kvmarm@lists.cs.columbia.edu, tabba@google.com, ardb@kernel.org,
	mark.rutland@arm.com, dbrazdil@google.com
Subject: [PATCH 2/3] KVM: arm64: Generate final CTR_EL0 value when running in Protected mode
Date: Mon, 22 Mar 2021 16:48:27 +0000	[thread overview]
Message-ID: <20210322164828.800662-3-maz@kernel.org> (raw)
In-Reply-To: <20210322164828.800662-1-maz@kernel.org>

In protected mode, late CPUs are not allowed to boot (enforced by
the PSCI relay). We can thus specialise the read_ctr macro to
always return a pre-computed, sanitised value.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/include/asm/assembler.h | 9 +++++++++
 arch/arm64/kernel/image-vars.h     | 1 +
 arch/arm64/kvm/va_layout.c         | 7 +++++++
 3 files changed, 17 insertions(+)

diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h
index fb651c1f26e9..1a4cee7eb3c9 100644
--- a/arch/arm64/include/asm/assembler.h
+++ b/arch/arm64/include/asm/assembler.h
@@ -270,12 +270,21 @@ alternative_endif
  * provide the system wide safe value from arm64_ftr_reg_ctrel0.sys_val
  */
 	.macro	read_ctr, reg
+#ifndef __KVM_NVHE_HYPERVISOR__
 alternative_if_not ARM64_MISMATCHED_CACHE_TYPE
 	mrs	\reg, ctr_el0			// read CTR
 	nop
 alternative_else
 	ldr_l	\reg, arm64_ftr_reg_ctrel0 + ARM64_FTR_SYSVAL
 alternative_endif
+#else
+alternative_cb kvm_compute_final_ctr_el0
+	movz	\reg, #0
+	movk	\reg, #0, lsl #16
+	movk	\reg, #0, lsl #32
+	movk	\reg, #0, lsl #48
+alternative_cb_end
+#endif
 	.endm
 
 
diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h
index d5dc2b792651..fdd60cd1d7e8 100644
--- a/arch/arm64/kernel/image-vars.h
+++ b/arch/arm64/kernel/image-vars.h
@@ -65,6 +65,7 @@ __efistub__ctype		= _ctype;
 KVM_NVHE_ALIAS(kvm_patch_vector_branch);
 KVM_NVHE_ALIAS(kvm_update_va_mask);
 KVM_NVHE_ALIAS(kvm_get_kimage_voffset);
+KVM_NVHE_ALIAS(kvm_compute_final_ctr_el0);
 
 /* Global kernel state accessed by nVHE hyp code. */
 KVM_NVHE_ALIAS(kvm_vgic_global_state);
diff --git a/arch/arm64/kvm/va_layout.c b/arch/arm64/kvm/va_layout.c
index 978301392d67..acdb7b3cc97d 100644
--- a/arch/arm64/kvm/va_layout.c
+++ b/arch/arm64/kvm/va_layout.c
@@ -288,3 +288,10 @@ void kvm_get_kimage_voffset(struct alt_instr *alt,
 {
 	generate_mov_q(kimage_voffset, origptr, updptr, nr_inst);
 }
+
+void kvm_compute_final_ctr_el0(struct alt_instr *alt,
+			       __le32 *origptr, __le32 *updptr, int nr_inst)
+{
+	generate_mov_q(read_sanitised_ftr_reg(SYS_CTR_EL0),
+		       origptr, updptr, nr_inst);
+}
-- 
2.29.2


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

  parent reply	other threads:[~2021-03-22 16:49 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-22 16:48 [PATCH 0/3] KVM:arm64: Proposed host stage-2 improvements Marc Zyngier
2021-03-22 16:48 ` Marc Zyngier
2021-03-22 16:48 ` Marc Zyngier
2021-03-22 16:48 ` [PATCH 1/3] KVM: arm64: Constraint KVM's own __flush_dcache_area to protectected mode Marc Zyngier
2021-03-22 16:48   ` Marc Zyngier
2021-03-22 16:48   ` Marc Zyngier
2021-03-22 16:48 ` Marc Zyngier [this message]
2021-03-22 16:48   ` [PATCH 2/3] KVM: arm64: Generate final CTR_EL0 value when running in Protected mode Marc Zyngier
2021-03-22 16:48   ` Marc Zyngier
2021-03-22 17:40   ` Quentin Perret
2021-03-22 17:40     ` Quentin Perret
2021-03-22 17:40     ` Quentin Perret
2021-03-22 18:37     ` Marc Zyngier
2021-03-22 18:37       ` Marc Zyngier
2021-03-22 18:37       ` Marc Zyngier
2021-03-23  9:47       ` Quentin Perret
2021-03-23  9:47         ` Quentin Perret
2021-03-23  9:47         ` Quentin Perret
2021-03-22 16:48 ` [PATCH 3/3] KVM: arm64: Drop the CPU_FTR_REG_HYP_COPY infrastructure Marc Zyngier
2021-03-22 16:48   ` Marc Zyngier
2021-03-22 16:48   ` Marc Zyngier

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