From: Andrew Scull <ascull@google.com> To: kvmarm@lists.cs.columbia.edu Cc: linux-arm-kernel@lists.infradead.org, kernel-team@android.com, maz@kernel.org, Sudeep Holla <sudeep.holla@arm.com>, catalin.marinas@arm.com, will@kernel.org Subject: [PATCH v3 07/18] KVM: arm64: nVHE: Don't consume host SErrors with ESB Date: Thu, 3 Sep 2020 14:52:56 +0100 [thread overview] Message-ID: <20200903135307.251331-8-ascull@google.com> (raw) In-Reply-To: <20200903135307.251331-1-ascull@google.com> The ESB at the start of the host vector may cause SErrors to be consumed to DISR_EL1. However, this is not checked for the host so the SError could go unhandled. Remove the ESB so that SErrors are not consumed but are instead left pending for the host to consume. __guest_enter already defers entry into a guest if there are any SErrors pending. Fixes: 0e5b9c085dce ("KVM: arm64: Consume pending SError as early as possible") Cc: James Morse <james.morse@arm.com> Signed-off-by: Andrew Scull <ascull@google.com> --- arch/arm64/kvm/hyp/nvhe/host.S | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kvm/hyp/nvhe/host.S b/arch/arm64/kvm/hyp/nvhe/host.S index 9c96b9a3b71d..5a7380c342c8 100644 --- a/arch/arm64/kvm/hyp/nvhe/host.S +++ b/arch/arm64/kvm/hyp/nvhe/host.S @@ -24,7 +24,6 @@ SYM_FUNC_END(__hyp_do_panic) .macro valid_host_el1_sync_vect .align 7 - esb stp x0, x1, [sp, #-16]! mrs x0, esr_el2 @@ -77,6 +76,11 @@ SYM_FUNC_END(__hyp_do_panic) .endm /* + * The host vector does not use an ESB instruction in order to avoid consuming + * SErrors that should only be consumed by the host. Guest entry is deferred by + * __guest_enter if there are any pending asynchronous exceptions so hyp will + * always return to the host without having consumerd host SErrors. + * * CONFIG_KVM_INDIRECT_VECTORS is not applied to the host vector because the * host already knows the address of hyp by virtue of loading it there. */ -- 2.28.0.402.g5ffc5be6b7-goog _______________________________________________ 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: Andrew Scull <ascull@google.com> To: kvmarm@lists.cs.columbia.edu Cc: linux-arm-kernel@lists.infradead.org, kernel-team@android.com, suzuki.poulose@arm.com, maz@kernel.org, Sudeep Holla <sudeep.holla@arm.com>, james.morse@arm.com, Andrew Scull <ascull@google.com>, catalin.marinas@arm.com, will@kernel.org, julien.thierry.kdev@gmail.com Subject: [PATCH v3 07/18] KVM: arm64: nVHE: Don't consume host SErrors with ESB Date: Thu, 3 Sep 2020 14:52:56 +0100 [thread overview] Message-ID: <20200903135307.251331-8-ascull@google.com> (raw) In-Reply-To: <20200903135307.251331-1-ascull@google.com> The ESB at the start of the host vector may cause SErrors to be consumed to DISR_EL1. However, this is not checked for the host so the SError could go unhandled. Remove the ESB so that SErrors are not consumed but are instead left pending for the host to consume. __guest_enter already defers entry into a guest if there are any SErrors pending. Fixes: 0e5b9c085dce ("KVM: arm64: Consume pending SError as early as possible") Cc: James Morse <james.morse@arm.com> Signed-off-by: Andrew Scull <ascull@google.com> --- arch/arm64/kvm/hyp/nvhe/host.S | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kvm/hyp/nvhe/host.S b/arch/arm64/kvm/hyp/nvhe/host.S index 9c96b9a3b71d..5a7380c342c8 100644 --- a/arch/arm64/kvm/hyp/nvhe/host.S +++ b/arch/arm64/kvm/hyp/nvhe/host.S @@ -24,7 +24,6 @@ SYM_FUNC_END(__hyp_do_panic) .macro valid_host_el1_sync_vect .align 7 - esb stp x0, x1, [sp, #-16]! mrs x0, esr_el2 @@ -77,6 +76,11 @@ SYM_FUNC_END(__hyp_do_panic) .endm /* + * The host vector does not use an ESB instruction in order to avoid consuming + * SErrors that should only be consumed by the host. Guest entry is deferred by + * __guest_enter if there are any pending asynchronous exceptions so hyp will + * always return to the host without having consumerd host SErrors. + * * CONFIG_KVM_INDIRECT_VECTORS is not applied to the host vector because the * host already knows the address of hyp by virtue of loading it there. */ -- 2.28.0.402.g5ffc5be6b7-goog _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2020-09-03 13:53 UTC|newest] Thread overview: 72+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-09-03 13:52 [PATCH v3 00/18] Introduce separate nVHE hyp context Andrew Scull 2020-09-03 13:52 ` Andrew Scull 2020-09-03 13:52 ` [PATCH v3 01/18] KVM: arm64: Remove __activate_vm wrapper Andrew Scull 2020-09-03 13:52 ` Andrew Scull 2020-09-03 13:52 ` [PATCH v3 02/18] KVM: arm64: Remove hyp_panic arguments Andrew Scull 2020-09-03 13:52 ` Andrew Scull 2020-09-07 10:21 ` Marc Zyngier 2020-09-07 10:21 ` Marc Zyngier 2020-09-03 13:52 ` [PATCH v3 03/18] KVM: arm64: Remove kvm_host_data_t typedef Andrew Scull 2020-09-03 13:52 ` Andrew Scull 2020-09-03 13:52 ` [PATCH v3 04/18] KVM: arm64: Restrict symbol aliasing to outside nVHE Andrew Scull 2020-09-03 13:52 ` Andrew Scull 2020-09-07 10:38 ` Marc Zyngier 2020-09-07 10:38 ` Marc Zyngier 2020-09-08 10:13 ` Andrew Scull 2020-09-08 10:13 ` Andrew Scull 2020-09-03 13:52 ` [PATCH v3 05/18] KVM: arm64: Save chosen hyp vector to a percpu variable Andrew Scull 2020-09-03 13:52 ` Andrew Scull 2020-09-03 13:52 ` [PATCH v3 06/18] KVM: arm64: nVHE: Use separate vector for the host Andrew Scull 2020-09-03 13:52 ` Andrew Scull 2020-09-07 11:38 ` Marc Zyngier 2020-09-07 11:38 ` Marc Zyngier 2020-09-08 10:29 ` Andrew Scull 2020-09-08 10:29 ` Andrew Scull 2020-09-03 13:52 ` Andrew Scull [this message] 2020-09-03 13:52 ` [PATCH v3 07/18] KVM: arm64: nVHE: Don't consume host SErrors with ESB Andrew Scull 2020-09-07 11:46 ` Marc Zyngier 2020-09-07 11:46 ` Marc Zyngier 2020-09-03 13:52 ` [PATCH v3 08/18] KVM: arm64: Introduce hyp context Andrew Scull 2020-09-03 13:52 ` Andrew Scull 2020-09-07 13:29 ` Marc Zyngier 2020-09-07 13:29 ` Marc Zyngier 2020-09-08 10:52 ` Andrew Scull 2020-09-08 10:52 ` Andrew Scull 2020-09-03 13:52 ` [PATCH v3 09/18] KVM: arm64: Update context references from host to hyp Andrew Scull 2020-09-03 13:52 ` Andrew Scull 2020-09-03 13:52 ` [PATCH v3 10/18] KVM: arm64: Restore hyp when panicking in guest context Andrew Scull 2020-09-03 13:52 ` Andrew Scull 2020-09-03 13:53 ` [PATCH v3 11/18] KVM: arm64: Share context save and restore macros Andrew Scull 2020-09-03 13:53 ` Andrew Scull 2020-09-03 13:53 ` [PATCH v3 12/18] KVM: arm64: nVHE: Switch to hyp context for EL2 Andrew Scull 2020-09-03 13:53 ` Andrew Scull 2020-09-07 13:02 ` Marc Zyngier 2020-09-07 13:02 ` Marc Zyngier 2020-09-08 10:42 ` Andrew Scull 2020-09-08 10:42 ` Andrew Scull 2020-09-03 13:53 ` [PATCH v3 13/18] KVM: arm64: nVHE: Handle hyp panics Andrew Scull 2020-09-03 13:53 ` Andrew Scull 2020-09-07 13:24 ` Marc Zyngier 2020-09-07 13:24 ` Marc Zyngier 2020-09-03 13:53 ` [PATCH v3 14/18] smccc: Cast arguments to unsigned long Andrew Scull 2020-09-03 13:53 ` Andrew Scull 2020-09-07 13:33 ` Marc Zyngier 2020-09-07 13:33 ` Marc Zyngier 2020-09-08 10:58 ` Andrew Scull 2020-09-08 10:58 ` Andrew Scull 2020-09-03 13:53 ` [PATCH v3 15/18] KVM: arm64: nVHE: Pass pointers consistently to hyp-init Andrew Scull 2020-09-03 13:53 ` Andrew Scull 2020-09-03 13:53 ` [PATCH v3 16/18] KVM: arm64: nVHE: Migrate hyp interface to SMCCC Andrew Scull 2020-09-03 13:53 ` Andrew Scull 2020-09-07 13:47 ` Marc Zyngier 2020-09-07 13:47 ` Marc Zyngier 2020-09-07 14:20 ` Marc Zyngier 2020-09-07 14:20 ` Marc Zyngier 2020-09-08 11:02 ` Andrew Scull 2020-09-08 11:02 ` Andrew Scull 2020-09-09 8:30 ` Andrew Scull 2020-09-09 8:30 ` Andrew Scull 2020-09-03 13:53 ` [PATCH v3 17/18] KVM: arm64: nVHE: Migrate hyp-init " Andrew Scull 2020-09-03 13:53 ` Andrew Scull 2020-09-03 13:53 ` [PATCH v3 18/18] KVM: arm64: nVHE: Fix pointers during SMCCC convertion Andrew Scull 2020-09-03 13:53 ` Andrew Scull
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