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From: james.morse@arm.com (James Morse)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v4 20/21] KVM: arm64: Take any host SError before entering the guest
Date: Fri, 03 Nov 2017 16:14:04 +0000	[thread overview]
Message-ID: <59FC95CC.3090706@arm.com> (raw)
In-Reply-To: <20171103124904.GC14144@cbox>

Hi Christoffer,

On 03/11/17 12:49, Christoffer Dall wrote:
> Does a non-secure esb() cause the error to be delivered to firmware on
> the secure side if anything is pending?

Yes, the ESB-instruction causes 'synchronisable' errors to become pending as an
SError. They then follow the normal SError rules.


> I'm not sure I fully understand the interaction between issuing an
> esb() in non-secure and firmware handling a RAS error; I thought there
> would be none, and that this was only for kernel-first ?

To implement firmware-first, EL3 has to set SCR_EL3.EA to route external-aborts
and physical SError to EL3. So an ESB-instruction, even in a guest, may cause an
SError to be taken to EL3 for firmware-first handling.

This is why RAS is causing so much noise for KVM, any notification could also
interrupt a guest, so firmware has to emulate an exception taken to EL2
correctly and KVM will have to plumb the notification across to the host APEI code.


Thanks,

James

  reply	other threads:[~2017-11-03 16:14 UTC|newest]

Thread overview: 80+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-10-19 14:57 [PATCH v4 00/21] SError rework + RAS&IESB for firmware first support James Morse
2017-10-19 14:57 ` [PATCH v4 01/21] arm64: explicitly mask all exceptions James Morse
2017-10-19 14:57 ` [PATCH v4 02/21] arm64: introduce an order for exceptions James Morse
2017-10-19 14:57 ` [PATCH v4 03/21] arm64: Move the async/fiq helpers to explicitly set process context flags James Morse
2017-10-19 14:57 ` [PATCH v4 04/21] arm64: Mask all exceptions during kernel_exit James Morse
2017-10-19 14:57 ` [PATCH v4 05/21] arm64: entry.S: Remove disable_dbg James Morse
2017-10-19 14:57 ` [PATCH v4 06/21] arm64: entry.S: convert el1_sync James Morse
2017-10-19 14:57 ` [PATCH v4 07/21] arm64: entry.S convert el0_sync James Morse
2017-10-19 14:57 ` [PATCH v4 08/21] arm64: entry.S: convert elX_irq James Morse
2017-10-19 14:57 ` [PATCH v4 09/21] KVM: arm/arm64: mask/unmask daif around VHE guests James Morse
2017-10-30  7:40   ` Christoffer Dall
2017-11-02 12:14     ` James Morse
2017-11-03 12:45       ` Christoffer Dall
2017-11-03 17:19         ` James Morse
2017-11-06 12:42           ` Christoffer Dall
2017-10-19 14:57 ` [PATCH v4 10/21] arm64: entry.S: move SError handling into a C function for future expansion James Morse
2018-01-02 21:07   ` Adam Wallis
2018-01-03 16:00     ` James Morse
2017-10-19 14:57 ` [PATCH v4 11/21] arm64: cpufeature: Detect CPU RAS Extentions James Morse
2017-10-31 13:14   ` Will Deacon
2017-11-02 12:15     ` James Morse
2017-10-19 14:57 ` [PATCH v4 12/21] arm64: kernel: Survive corrected RAS errors notified by SError James Morse
2017-10-31 13:50   ` Will Deacon
2017-11-02 12:15     ` James Morse
2017-10-19 14:57 ` [PATCH v4 13/21] arm64: cpufeature: Enable IESB on exception entry/return for firmware-first James Morse
2017-10-31 13:56   ` Will Deacon
2017-10-19 14:58 ` [PATCH v4 14/21] arm64: kernel: Prepare for a DISR user James Morse
2017-10-19 14:58 ` [PATCH v4 15/21] KVM: arm64: Set an impdef ESR for Virtual-SError using VSESR_EL2 James Morse
2017-10-20 16:44   ` gengdongjiu
2017-10-23 15:26     ` James Morse
2017-10-24  9:53       ` gengdongjiu
2017-10-30  7:59   ` Christoffer Dall
2017-10-30 10:51     ` Christoffer Dall
2017-10-30 15:44       ` James Morse
2017-10-31  5:48         ` Christoffer Dall
2017-10-31  6:34   ` Marc Zyngier
2017-10-19 14:58 ` [PATCH v4 16/21] KVM: arm64: Save/Restore guest DISR_EL1 James Morse
2017-10-31  4:27   ` Marc Zyngier
2017-10-31  5:27   ` Christoffer Dall
2017-10-19 14:58 ` [PATCH v4 17/21] KVM: arm64: Save ESR_EL2 on guest SError James Morse
2017-10-31  4:26   ` Marc Zyngier
2017-10-31  5:47     ` Marc Zyngier
2017-11-01 17:42       ` James Morse
2017-10-19 14:58 ` [PATCH v4 18/21] KVM: arm64: Handle RAS SErrors from EL1 on guest exit James Morse
2017-10-31  5:55   ` Marc Zyngier
2017-10-31  5:56   ` Christoffer Dall
2017-10-19 14:58 ` [PATCH v4 19/21] KVM: arm64: Handle RAS SErrors from EL2 " James Morse
2017-10-27  6:26   ` gengdongjiu
2017-10-27 17:38     ` James Morse
2017-10-31  6:13   ` Marc Zyngier
2017-10-31  6:13   ` Christoffer Dall
2017-10-19 14:58 ` [PATCH v4 20/21] KVM: arm64: Take any host SError before entering the guest James Morse
2017-10-31  6:23   ` Christoffer Dall
2017-10-31 11:43     ` James Morse
2017-11-01  4:55       ` Christoffer Dall
2017-11-02 12:18         ` James Morse
2017-11-03 12:49           ` Christoffer Dall
2017-11-03 16:14             ` James Morse [this message]
2017-11-06 12:45               ` Christoffer Dall
2017-10-19 14:58 ` [PATCH v4 21/21] KVM: arm64: Trap RAS error registers and set HCR_EL2's TERR & TEA James Morse
2017-10-31  6:32   ` Christoffer Dall
2017-10-31  6:32   ` Marc Zyngier
2017-10-31  6:35 ` [PATCH v4 00/21] SError rework + RAS&IESB for firmware first support Christoffer Dall
2017-10-31 10:08   ` Will Deacon
2017-11-01 15:23     ` James Morse
2017-11-02  8:14       ` Christoffer Dall
2017-11-09 18:14 ` James Morse
2017-11-10 12:03   ` gengdongjiu
2017-11-13 11:29   ` Christoffer Dall
2017-11-13 13:05     ` Peter Maydell
2017-11-20  8:53       ` Christoffer Dall
2017-11-13 16:14     ` Andrew Jones
2017-11-13 17:56       ` Peter Maydell
2017-11-14 16:11       ` James Morse
2017-11-15  9:59         ` gengdongjiu
2017-11-14 16:03     ` James Morse
2017-11-15  9:15       ` gengdongjiu
2017-11-15 18:25         ` James Morse
2017-11-21 11:31           ` gengdongjiu
2017-11-20  8:55       ` Christoffer Dall

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