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Date: Fri, 13 Oct 2017 02:30:46 +0800
From: gengdongjiu <gengdj.1984@...il.com>
To: Dongjiu Geng <gengdongjiu@...wei.com>,
Christoffer Dall <christoffer.dall@...aro.org>,
Marc Zyngier <marc.zyngier@....com>
Cc: will.deacon@....com, zjzhang@...eaurora.org,
catalin.marinas@....com, Tyler Baicar <tbaicar@...eaurora.org>,
Borislav Petkov <bp@...e.de>,
James Morse <james.morse@....com>,
Geliang Tang <geliangtang@...il.com>,
andriy.shevchenko@...ux.intel.com, tony.luck@...el.com,
austinwc@...eaurora.org, rjw@...ysocki.net,
Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org,
linux-kernel@...r.kernel.org, linuxarm@...wei.com,
John Garry <john.garry@...wei.com>,
Shiju Jose <shiju.jose@...wei.com>, zhengqiang10@...wei.com,
Xiongfeng Wang <wangxiongfeng2@...wei.com>,
Huangshaoyu <huangshaoyu@...wei.com>
Subject: Re: [PATCH v3 1/2] acpi: apei: remove the unused dead-code for SEA
notification type
Hi James/Rafael/Borislav,
what is your comments about these two patches? Seems they are pending
long time, I will appreciate that if you can give some review
comments. Thanks very much, Tyler has tested the second patch.
[PATCH v3 1/2] acpi: apei: remove the unused dead-code for SEA notification type
[PATCH v3 2/2] acpi: apei: Add SEI notification type support for ARMv8
2017-09-28 20:41 GMT+08:00 Dongjiu Geng <gengdongjiu@...wei.com>:
> In current code logic, the two functions ghes_sea_add() and
> ghes_sea_remove() are only called when CONFIG_ACPI_APEI_SEA
> is defined. If not, it will return errors in the ghes_probe()
> and not continue. If the probe is failed, the ghes_sea_remove()
> also has no chance to be called. Hence, remove the unnecessary
> handling when CONFIG_ACPI_APEI_SEA is not defined.
>
> In the firmware-first RAS solution, the IPA fault address recorded
> by hpfar_el2 may be UNKNOWN, and also current code does not use it,
> so remove it.
>
> Cc: Stephen Boyd <sboyd@...eaurora.org>
> Cc: James Morse <james.morse@....com>
> Cc: Tyler Baicar <tbaicar@...eaurora.org>
> Signed-off-by: Dongjiu Geng <gengdongjiu@...wei.com>
>
> ---
> v2->v3:
> 1. remove the fault_ipa address
> If ESR_ELx.DFSC is Synchronous External Abort on memory access(0b010000),
> the hpfar_el2's value will be UNKNOWN, so this value is not accurate.
>
> It is ever discussed here:
> https://lkml.org/lkml/2017/9/8/623
> ---
> arch/arm/include/asm/system_misc.h | 2 +-
> arch/arm64/include/asm/system_misc.h | 2 +-
> arch/arm64/mm/fault.c | 2 +-
> drivers/acpi/apei/ghes.c | 14 --------------
> virt/kvm/arm/mmu.c | 2 +-
> 5 files changed, 4 insertions(+), 18 deletions(-)
>
> diff --git a/arch/arm/include/asm/system_misc.h b/arch/arm/include/asm/system_misc.h
> index 8c4a89f..5b53a1c 100644
> --- a/arch/arm/include/asm/system_misc.h
> +++ b/arch/arm/include/asm/system_misc.h
> @@ -22,7 +22,7 @@ extern void (*arm_pm_idle)(void);
>
> extern unsigned int user_debug;
>
> -static inline int handle_guest_sea(phys_addr_t addr, unsigned int esr)
> +static inline int handle_guest_sea(unsigned int esr)
> {
> return -1;
> }
> diff --git a/arch/arm64/include/asm/system_misc.h b/arch/arm64/include/asm/system_misc.h
> index 07aa8e3..3f0d0a8 100644
> --- a/arch/arm64/include/asm/system_misc.h
> +++ b/arch/arm64/include/asm/system_misc.h
> @@ -56,7 +56,7 @@ extern void (*arm_pm_restart)(enum reboot_mode reboot_mode, const char *cmd);
> __show_ratelimited; \
> })
>
> -int handle_guest_sea(phys_addr_t addr, unsigned int esr);
> +int handle_guest_sea(unsigned int esr);
>
> #endif /* __ASSEMBLY__ */
>
> diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
> index 2509e4f..13391f4 100644
> --- a/arch/arm64/mm/fault.c
> +++ b/arch/arm64/mm/fault.c
> @@ -677,7 +677,7 @@ static const struct fault_info fault_info[] = {
> * and non-zero if there was an error processing the error or there was
> * no error to process.
> */
> -int handle_guest_sea(phys_addr_t addr, unsigned int esr)
> +int handle_guest_sea(unsigned int esr)
> {
> int ret = -ENOENT;
>
> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
> index d661d45..c15a08d 100644
> --- a/drivers/acpi/apei/ghes.c
> +++ b/drivers/acpi/apei/ghes.c
> @@ -813,7 +813,6 @@ static struct notifier_block ghes_notifier_hed = {
> .notifier_call = ghes_notify_hed,
> };
>
> -#ifdef CONFIG_ACPI_APEI_SEA
> static LIST_HEAD(ghes_sea);
>
> /*
> @@ -848,19 +847,6 @@ static void ghes_sea_remove(struct ghes *ghes)
> mutex_unlock(&ghes_list_mutex);
> synchronize_rcu();
> }
> -#else /* CONFIG_ACPI_APEI_SEA */
> -static inline void ghes_sea_add(struct ghes *ghes)
> -{
> - pr_err(GHES_PFX "ID: %d, trying to add SEA notification which is not supported\n",
> - ghes->generic->header.source_id);
> -}
> -
> -static inline void ghes_sea_remove(struct ghes *ghes)
> -{
> - pr_err(GHES_PFX "ID: %d, trying to remove SEA notification which is not supported\n",
> - ghes->generic->header.source_id);
> -}
> -#endif /* CONFIG_ACPI_APEI_SEA */
>
> #ifdef CONFIG_HAVE_ACPI_APEI_NMI
> /*
> diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c
> index 2ea21da..07636c2 100644
> --- a/virt/kvm/arm/mmu.c
> +++ b/virt/kvm/arm/mmu.c
> @@ -1504,7 +1504,7 @@ int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run)
> * is no need to pass the error into the guest.
> */
> if (is_abort_sea(fault_status)) {
> - if (!handle_guest_sea(fault_ipa, kvm_vcpu_get_hsr(vcpu)))
> + if (!handle_guest_sea(kvm_vcpu_get_hsr(vcpu)))
> return 1;
> }
>
> --
> 2.10.1
>
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