From: Marc Zyngier <marc.zyngier@arm.com> To: linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu Cc: Russell King <linux@arm.linux.org.uk>, Ard Biesheuvel <ard.biesheuvel@linaro.org>, Catalin Marinas <catalin.marinas@arm.com>, Keerthy <j-keerthy@ti.com> Subject: [PATCH v4 04/28] arm64: hyp-stub: Implement HVC_RESET_VECTORS stub hypercall Date: Tue, 21 Mar 2017 19:20:34 +0000 [thread overview] Message-ID: <20170321192058.9300-5-marc.zyngier@arm.com> (raw) In-Reply-To: <20170321192058.9300-1-marc.zyngier@arm.com> Let's define a new stub hypercall that resets the HYP configuration to its default: hyp-stub vectors, and MMU disabled. Of course, for the hyp-stub itself, this is a trivial no-op. Hypervisors will have a bit more work to do. Reviewed-by: James Morse <james.morse@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> --- arch/arm64/include/asm/virt.h | 9 +++++++++ arch/arm64/kernel/hyp-stub.S | 11 ++++++++++- 2 files changed, 19 insertions(+), 1 deletion(-) diff --git a/arch/arm64/include/asm/virt.h b/arch/arm64/include/asm/virt.h index 439f6b5d31f6..f24f1eb72dc0 100644 --- a/arch/arm64/include/asm/virt.h +++ b/arch/arm64/include/asm/virt.h @@ -39,6 +39,14 @@ */ #define HVC_SOFT_RESTART 2 +/* + * HVC_RESET_VECTORS - Restore the vectors to the original HYP stubs + */ +#define HVC_RESET_VECTORS 3 + +/* Max number of HYP stub hypercalls */ +#define HVC_STUB_HCALL_NR 4 + #define BOOT_CPU_MODE_EL1 (0xe11) #define BOOT_CPU_MODE_EL2 (0xe12) @@ -62,6 +70,7 @@ extern u32 __boot_cpu_mode[2]; void __hyp_set_vectors(phys_addr_t phys_vector_base); phys_addr_t __hyp_get_vectors(void); +void __hyp_reset_vectors(void); /* Reports the availability of HYP mode */ static inline bool is_hyp_mode_available(void) diff --git a/arch/arm64/kernel/hyp-stub.S b/arch/arm64/kernel/hyp-stub.S index 193dfb25ce2f..dd0a7522fbe1 100644 --- a/arch/arm64/kernel/hyp-stub.S +++ b/arch/arm64/kernel/hyp-stub.S @@ -73,8 +73,11 @@ el1_sync: mov x1, x3 br x4 // no return +3: cmp x0, #HVC_RESET_VECTORS + beq 9f // Nothing to reset! + /* Someone called kvm_call_hyp() against the hyp-stub... */ -3: mov x0, #ARM_EXCEPTION_HYP_GONE + mov x0, #ARM_EXCEPTION_HYP_GONE 9: eret ENDPROC(el1_sync) @@ -127,3 +130,9 @@ ENTRY(__hyp_set_vectors) hvc #0 ret ENDPROC(__hyp_set_vectors) + +ENTRY(__hyp_reset_vectors) + mov x0, #HVC_RESET_VECTORS + hvc #0 + ret +ENDPROC(__hyp_reset_vectors) -- 2.11.0
WARNING: multiple messages have this Message-ID (diff)
From: marc.zyngier@arm.com (Marc Zyngier) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v4 04/28] arm64: hyp-stub: Implement HVC_RESET_VECTORS stub hypercall Date: Tue, 21 Mar 2017 19:20:34 +0000 [thread overview] Message-ID: <20170321192058.9300-5-marc.zyngier@arm.com> (raw) In-Reply-To: <20170321192058.9300-1-marc.zyngier@arm.com> Let's define a new stub hypercall that resets the HYP configuration to its default: hyp-stub vectors, and MMU disabled. Of course, for the hyp-stub itself, this is a trivial no-op. Hypervisors will have a bit more work to do. Reviewed-by: James Morse <james.morse@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> --- arch/arm64/include/asm/virt.h | 9 +++++++++ arch/arm64/kernel/hyp-stub.S | 11 ++++++++++- 2 files changed, 19 insertions(+), 1 deletion(-) diff --git a/arch/arm64/include/asm/virt.h b/arch/arm64/include/asm/virt.h index 439f6b5d31f6..f24f1eb72dc0 100644 --- a/arch/arm64/include/asm/virt.h +++ b/arch/arm64/include/asm/virt.h @@ -39,6 +39,14 @@ */ #define HVC_SOFT_RESTART 2 +/* + * HVC_RESET_VECTORS - Restore the vectors to the original HYP stubs + */ +#define HVC_RESET_VECTORS 3 + +/* Max number of HYP stub hypercalls */ +#define HVC_STUB_HCALL_NR 4 + #define BOOT_CPU_MODE_EL1 (0xe11) #define BOOT_CPU_MODE_EL2 (0xe12) @@ -62,6 +70,7 @@ extern u32 __boot_cpu_mode[2]; void __hyp_set_vectors(phys_addr_t phys_vector_base); phys_addr_t __hyp_get_vectors(void); +void __hyp_reset_vectors(void); /* Reports the availability of HYP mode */ static inline bool is_hyp_mode_available(void) diff --git a/arch/arm64/kernel/hyp-stub.S b/arch/arm64/kernel/hyp-stub.S index 193dfb25ce2f..dd0a7522fbe1 100644 --- a/arch/arm64/kernel/hyp-stub.S +++ b/arch/arm64/kernel/hyp-stub.S @@ -73,8 +73,11 @@ el1_sync: mov x1, x3 br x4 // no return +3: cmp x0, #HVC_RESET_VECTORS + beq 9f // Nothing to reset! + /* Someone called kvm_call_hyp() against the hyp-stub... */ -3: mov x0, #ARM_EXCEPTION_HYP_GONE + mov x0, #ARM_EXCEPTION_HYP_GONE 9: eret ENDPROC(el1_sync) @@ -127,3 +130,9 @@ ENTRY(__hyp_set_vectors) hvc #0 ret ENDPROC(__hyp_set_vectors) + +ENTRY(__hyp_reset_vectors) + mov x0, #HVC_RESET_VECTORS + hvc #0 + ret +ENDPROC(__hyp_reset_vectors) -- 2.11.0
next prev parent reply other threads:[~2017-03-21 19:20 UTC|newest] Thread overview: 112+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-03-21 19:20 [PATCH v4 00/28] arm/arm64: KVM: Rework the hyp-stub API Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 01/28] arm64: hyp-stub: Stop pointlessly clobbering lr Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 02/28] arm64: KVM: Move lr save/restore to do_el2_call Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-23 11:57 ` Marc Zyngier 2017-03-23 11:57 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 03/28] arm64: hyp-stub: Don't save lr in the EL1 code Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier [this message] 2017-03-21 19:20 ` [PATCH v4 04/28] arm64: hyp-stub: Implement HVC_RESET_VECTORS stub hypercall Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 05/28] arm64: KVM: Implement HVC_RESET_VECTORS stub hypercall in the init code Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-24 14:33 ` Christoffer Dall 2017-03-24 14:33 ` Christoffer Dall 2017-03-24 14:45 ` Marc Zyngier 2017-03-24 14:45 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 06/28] arm64: KVM: Implement HVC_GET_VECTORS " Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 07/28] arm64: KVM: Allow the main HYP code to use the init hyp stub implementation Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-24 14:33 ` Christoffer Dall 2017-03-24 14:33 ` Christoffer Dall 2017-03-24 14:56 ` Marc Zyngier 2017-03-24 14:56 ` Marc Zyngier 2017-04-03 17:28 ` Christoffer Dall 2017-04-03 17:28 ` Christoffer Dall 2017-03-21 19:20 ` [PATCH v4 08/28] arm64: KVM: Convert __cpu_reset_hyp_mode to using __hyp_reset_vectors Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 09/28] arm64: KVM: Implement HVC_SOFT_RESTART in the init code Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 10/28] ARM: hyp-stub: improve ABI Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 11/28] ARM: soft-reboot into same mode that we entered the kernel Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 12/28] ARM: KVM: Convert KVM to use HVC_GET_VECTORS Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 13/28] ARM: Update cpu_v7_reset documentation Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 14/28] ARM: hyp-stub: Use r1 for the soft-restart address Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 15/28] ARM: Expose the VA/IDMAP offset Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 16/28] ARM: hyp-stub: Implement HVC_RESET_VECTORS stub hypercall Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 17/28] ARM: KVM: Implement HVC_RESET_VECTORS stub hypercall in the init code Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 18/28] ARM: KVM: Implement HVC_GET_VECTORS " Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 19/28] ARM: KVM: Allow the main HYP code to use the init hyp stub implementation Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-24 14:34 ` Christoffer Dall 2017-03-24 14:34 ` Christoffer Dall 2017-03-24 15:01 ` Marc Zyngier 2017-03-24 15:01 ` Marc Zyngier 2017-04-03 17:32 ` Christoffer Dall 2017-04-03 17:32 ` Christoffer Dall 2017-04-03 17:51 ` Marc Zyngier 2017-04-03 17:51 ` Marc Zyngier 2017-04-04 7:36 ` Christoffer Dall 2017-04-04 7:36 ` Christoffer Dall 2017-03-21 19:20 ` [PATCH v4 20/28] ARM: KVM: Convert __cpu_reset_hyp_mode to using __hyp_reset_vectors Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 21/28] ARM: KVM: Implement HVC_SOFT_RESTART in the init code Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 22/28] arm/arm64: KVM: Use __hyp_reset_vectors() directly Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 23/28] arm/arm64: KVM: Remove kvm_get_idmap_start Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 24/28] arm/arm64: KVM: Use HVC_RESET_VECTORS to reinit HYP mode Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 25/28] ARM: decompressor: Remove __hyp_get_vectors usage Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-24 14:34 ` Christoffer Dall 2017-03-24 14:34 ` Christoffer Dall 2017-03-24 15:26 ` Marc Zyngier 2017-03-24 15:26 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 26/28] ARM: hyp-stub/KVM: Kill __hyp_get_vectors Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 27/28] arm64: " Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 28/28] arm/arm64: Add hyp-stub API documentation Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-24 14:33 ` Christoffer Dall 2017-03-24 14:33 ` Christoffer Dall 2017-03-24 14:42 ` Marc Zyngier 2017-03-24 14:42 ` Marc Zyngier 2017-03-24 15:23 ` Christoffer Dall 2017-03-24 15:23 ` Christoffer Dall 2017-03-24 15:57 ` Marc Zyngier 2017-03-24 15:57 ` Marc Zyngier 2017-03-24 16:03 ` Christoffer Dall 2017-03-24 16:03 ` Christoffer Dall 2017-03-22 13:37 ` [PATCH v4 00/28] arm/arm64: KVM: Rework the hyp-stub API Christoffer Dall 2017-03-22 13:37 ` Christoffer Dall 2017-03-22 16:14 ` Marc Zyngier 2017-03-22 16:14 ` Marc Zyngier 2017-03-22 17:27 ` Christoffer Dall 2017-03-22 17:27 ` Christoffer Dall 2017-03-23 10:53 ` Marc Zyngier 2017-03-23 10:53 ` Marc Zyngier 2017-03-23 14:39 ` Christoffer Dall 2017-03-23 14:39 ` Christoffer Dall 2017-03-23 15:16 ` Marc Zyngier 2017-03-23 15:16 ` Marc Zyngier 2017-03-23 15:45 ` Christoffer Dall 2017-03-23 15:45 ` Christoffer Dall 2017-03-22 16:20 ` Catalin Marinas 2017-03-22 16:20 ` Catalin Marinas 2017-03-24 14:36 ` Christoffer Dall 2017-03-24 14:36 ` Christoffer Dall
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