From: Marc Zyngier <maz@kernel.org>
To: Andrew Scull <ascull@google.com>
Cc: kernel-team@android.com, suzuki.poulose@arm.com,
catalin.marinas@arm.com, james.morse@arm.com,
linux-arm-kernel@lists.infradead.org,
Sudeep Holla <sudeep.holla@arm.com>,
David Brazdil <dbrazdil@google.com>,
will@kernel.org, kvmarm@lists.cs.columbia.edu,
julien.thierry.kdev@gmail.com
Subject: Re: [PATCH v3 04/18] KVM: arm64: Restrict symbol aliasing to outside nVHE
Date: Mon, 07 Sep 2020 11:38:38 +0100 [thread overview]
Message-ID: <87zh61lvm9.wl-maz@kernel.org> (raw)
In-Reply-To: <20200903135307.251331-5-ascull@google.com>
Hi Andrew,
On Thu, 03 Sep 2020 14:52:53 +0100,
Andrew Scull <ascull@google.com> wrote:
>
> nVHE symbols are prefixed but this is sometimes hidden from the host by
> aliasing the non-prefixed symbol to the prefixed version with a macro.
> This runs into problems if nVHE tries to use the symbol as it becomes
> doubly prefixed. Avoid this by omitting the aliasing macro for nVHE.
>
> Cc: David Brazdil <dbrazdil@google.com>
> Signed-off-by: Andrew Scull <ascull@google.com>
> ---
> arch/arm64/include/asm/kvm_asm.h | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h
> index 6f98fbd0ac81..6f9c4162a764 100644
> --- a/arch/arm64/include/asm/kvm_asm.h
> +++ b/arch/arm64/include/asm/kvm_asm.h
> @@ -99,8 +99,11 @@ struct kvm_s2_mmu;
>
> DECLARE_KVM_NVHE_SYM(__kvm_hyp_init);
> DECLARE_KVM_HYP_SYM(__kvm_hyp_vector);
> +
> +#ifndef __KVM_NVHE_HYPERVISOR__
> #define __kvm_hyp_init CHOOSE_NVHE_SYM(__kvm_hyp_init)
> #define __kvm_hyp_vector CHOOSE_HYP_SYM(__kvm_hyp_vector)
> +#endif
Hmmm. Why do we limit this to these two symbols instead of making it a
property of the "CHOOSE_*" implementation?
The use of CHOOSE_HYP_SYM is already forbidden in the EL2 code (see
how any symbol results in __nvhe_undefined_symbol being emitted). Does
anything break if we have:
#define CHOOSE_NVHE_SYM(x) x
when __KVM_NVHE_HYPERVISOR__ is defined?
Thanks,
M.
--
Without deviation from the norm, progress is not possible.
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next prev parent reply other threads:[~2020-09-07 10:40 UTC|newest]
Thread overview: 36+ 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 ` [PATCH v3 01/18] KVM: arm64: Remove __activate_vm wrapper Andrew Scull
2020-09-03 13:52 ` [PATCH v3 02/18] KVM: arm64: Remove hyp_panic arguments Andrew Scull
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 ` [PATCH v3 04/18] KVM: arm64: Restrict symbol aliasing to outside nVHE Andrew Scull
2020-09-07 10:38 ` Marc Zyngier [this message]
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 ` [PATCH v3 06/18] KVM: arm64: nVHE: Use separate vector for the host Andrew Scull
2020-09-07 11:38 ` Marc Zyngier
2020-09-08 10:29 ` Andrew Scull
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
2020-09-03 13:52 ` [PATCH v3 08/18] KVM: arm64: Introduce hyp context Andrew Scull
2020-09-07 13:29 ` Marc Zyngier
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 ` [PATCH v3 10/18] KVM: arm64: Restore hyp when panicking in guest context 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 ` [PATCH v3 12/18] KVM: arm64: nVHE: Switch to hyp context for EL2 Andrew Scull
2020-09-07 13:02 ` Marc Zyngier
2020-09-08 10:42 ` Andrew Scull
2020-09-03 13:53 ` [PATCH v3 13/18] KVM: arm64: nVHE: Handle hyp panics Andrew Scull
2020-09-07 13:24 ` Marc Zyngier
2020-09-03 13:53 ` [PATCH v3 14/18] smccc: Cast arguments to unsigned long Andrew Scull
2020-09-07 13:33 ` Marc Zyngier
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 ` [PATCH v3 16/18] KVM: arm64: nVHE: Migrate hyp interface to SMCCC Andrew Scull
2020-09-07 13:47 ` Marc Zyngier
2020-09-07 14:20 ` Marc Zyngier
2020-09-08 11:02 ` 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 ` [PATCH v3 18/18] KVM: arm64: nVHE: Fix pointers during SMCCC convertion Andrew Scull
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