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From: "Maciej W. Rozycki" <macro@linux-mips.org>
To: James Hogan <james.hogan@imgtec.com>
Cc: Matt Redfearn <matt.redfearn@imgtec.com>,
	Ralf Baechle <ralf@linux-mips.org>,
	linux-mips@linux-mips.org
Subject: Re: [PATCH 1/9] MIPS: traps: 64bit kernels should read CP0_EBase 64bit
Date: Fri, 7 Oct 2016 00:07:42 +0100 (BST)	[thread overview]
Message-ID: <alpine.LFD.2.20.1610062358550.1794@eddie.linux-mips.org> (raw)
In-Reply-To: <20161006225024.GJ19354@jhogan-linux.le.imgtec.org>

On Thu, 6 Oct 2016, James Hogan wrote:

> I don't particularly object to always allocating our own vector when
> EBase is present. It'd probably break KVM, but that's KVM's fault for
> not emulating EBase properly yet.

 In most cases we'll use the default KSEG0 base address anyway, won't we?

> I suppose there is also an advantage to keeping the bootloader exception
> vector as alive as possible at least until Linux has set up its own one,
> as it allows early bugs to be caught by the bootloader, which can dump
> registers etc and even return to the bootloader prompt.

 Right, but I think using our own allocated memory actually helps that in 
that we can install our exception handlers first and only then switch 
EBase, which is atomic (modulo probing for WG, but perhaps we don't 
actually have to do that).  Whereas overwriting firmware memory already 
pointed to by EBase while installing exception handlers is pretty much 
destructive right away, as there'll always be a stage at which a partially 
installed handler is non-functional.

  Maciej

  reply	other threads:[~2016-10-06 23:07 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-09-01 16:30 [PATCH 0/9] MIPS: General EVA fixes & cleanups James Hogan
2016-09-01 16:30 ` [PATCH 1/9] MIPS: traps: 64bit kernels should read CP0_EBase 64bit James Hogan
2016-09-01 16:30   ` James Hogan
2016-09-21 13:08   ` Ralf Baechle
2016-09-21 15:01     ` Matt Redfearn
2016-09-21 15:01       ` Matt Redfearn
2016-10-02 10:30       ` Maciej W. Rozycki
2016-10-05 15:56         ` James Hogan
2016-10-05 15:56           ` James Hogan
2016-10-06 16:18           ` Maciej W. Rozycki
2016-10-06 18:05             ` James Hogan
2016-10-06 18:05               ` James Hogan
2016-10-06 19:56               ` Maciej W. Rozycki
2016-10-06 20:19                 ` James Hogan
2016-10-06 20:19                   ` James Hogan
2016-10-06 22:41                   ` Maciej W. Rozycki
2016-10-06 22:50                     ` James Hogan
2016-10-06 22:50                       ` James Hogan
2016-10-06 23:07                       ` Maciej W. Rozycki [this message]
2016-10-07 15:35             ` David Daney
2016-10-07 15:41               ` David Daney
2016-10-07 17:39                 ` Maciej W. Rozycki
2016-09-01 16:30 ` [PATCH 2/9] MIPS: traps: Convert ebase to KSeg0 James Hogan
2016-09-01 16:30   ` James Hogan
2016-09-01 16:30 ` [PATCH 3/9] MIPS: traps: Ensure full EBase is written James Hogan
2016-09-01 16:30   ` James Hogan
2016-09-21 13:19   ` Ralf Baechle
2016-09-01 16:30 ` [PATCH 4/9] MIPS: c-r4k: Drop bc_wback_inv() from icache flush James Hogan
2016-09-01 16:30   ` James Hogan
2016-09-01 16:30 ` [PATCH 5/9] MIPS: c-r4k: Split user/kernel flush_icache_range() James Hogan
2016-09-01 16:30   ` James Hogan
2016-09-01 16:30 ` [PATCH 6/9] MIPS: cacheflush: Use __flush_icache_user_range() James Hogan
2016-09-01 16:30   ` James Hogan
2016-09-01 16:30 ` [PATCH 7/9] MIPS: uprobes: Flush icache via kernel address James Hogan
2016-09-01 16:30   ` James Hogan
2016-09-21 13:26   ` Ralf Baechle
2016-09-21 18:15     ` Leonid Yegoshin
2016-09-21 18:15       ` Leonid Yegoshin
2016-09-22 21:15       ` James Hogan
2016-09-22 21:15         ` James Hogan
2016-09-22 21:38         ` Leonid Yegoshin
2016-09-22 21:38           ` Leonid Yegoshin
2016-09-22 21:42           ` Leonid Yegoshin
2016-09-22 21:42             ` Leonid Yegoshin
2016-09-22 22:13           ` James Hogan
2016-09-22 22:27             ` Leonid Yegoshin
2016-09-22 22:27               ` Leonid Yegoshin
2016-09-23  7:10               ` James Hogan
2016-09-01 16:30 ` [PATCH 8/9] MIPS: KVM: Use __local_flush_icache_user_range() James Hogan
2016-09-01 16:30 ` [PATCH 9/9] MIPS: c-r4k: Fix flush_icache_range() for EVA James Hogan
2016-09-01 16:30   ` James Hogan

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