From: Catalin Marinas <catalin.marinas@arm.com>
To: Mark Rutland <mark.rutland@arm.com>
Cc: james.morse@arm.com, will@kernel.org, hch@lst.de,
linux-arm-kernel@lists.infradead.org, robin.murphy@arm.com
Subject: Re: [PATCHv4 14/17] arm64: uaccess: remove set_fs()
Date: Mon, 16 Nov 2020 17:40:48 +0000 [thread overview]
Message-ID: <X7K5oEqLmTh6spvf@trantor> (raw)
In-Reply-To: <20201113124937.20574-15-mark.rutland@arm.com>
Hi Mark,
On Fri, Nov 13, 2020 at 12:49:34PM +0000, Mark Rutland wrote:
> We no longer need to flip UAO to access kernel memory under KERNEL_DS,
> and head.S unconditionally clears UAO for all kernel configurations via
> an ERET in init_kernel_el. Thus, we don't need to dynamically flip UAO,
> nor do we need to context-switch it. However, we do need to clear UAO
> (and set PAN) during SDEI entry.
If the kernel never sets the UAO bit, why do we need to clear it during
SDEI entry?
--
Catalin
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next prev parent reply other threads:[~2020-11-16 17:41 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-13 12:49 [PATCHv4 00/17] arm64: remove set_fs() and friends Mark Rutland
2020-11-13 12:49 ` [PATCHv4 01/17] arm64: ensure ERET from kthread is illegal Mark Rutland
2020-11-13 12:49 ` [PATCHv4 02/17] arm64: add C wrappers for SET_PSTATE_*() Mark Rutland
2020-11-13 12:49 ` [PATCHv4 03/17] arm64: head.S: rename el2_setup -> init_kernel_el Mark Rutland
2020-11-13 12:49 ` [PATCHv4 04/17] arm64: head.S: cleanup SCTLR_ELx initialization Mark Rutland
2020-11-13 12:49 ` [PATCHv4 05/17] arm64: head.S: always initialize PSTATE Mark Rutland
2020-11-13 12:49 ` [PATCHv4 06/17] arm64: sdei: move uaccess logic to arch/arm64/ Mark Rutland
2020-11-16 17:42 ` Catalin Marinas
2020-11-26 18:42 ` James Morse
2020-11-13 12:49 ` [PATCHv4 07/17] arm64: sdei: explicitly simulate PAN/UAO entry Mark Rutland
2020-11-26 18:42 ` James Morse
2020-12-01 12:14 ` Mark Rutland
2020-11-13 12:49 ` [PATCHv4 08/17] arm64: uaccess: move uao_* alternatives to asm-uaccess.h Mark Rutland
2020-11-14 9:22 ` Christoph Hellwig
2020-11-16 12:25 ` Mark Rutland
2020-11-13 12:49 ` [PATCHv4 09/17] arm64: uaccess: rename privileged uaccess routines Mark Rutland
2020-11-13 12:49 ` [PATCHv4 10/17] arm64: uaccess: simplify __copy_user_flushcache() Mark Rutland
2020-11-13 12:49 ` [PATCHv4 11/17] arm64: uaccess: refactor __{get,put}_user Mark Rutland
2020-11-13 12:49 ` [PATCHv4 12/17] arm64: uaccess: split user/kernel routines Mark Rutland
2020-11-26 18:42 ` James Morse
2020-12-01 11:03 ` Mark Rutland
2020-12-02 12:19 ` Mark Rutland
2020-11-13 12:49 ` [PATCHv4 13/17] arm64: uaccess cleanup macro naming Mark Rutland
2020-11-13 12:49 ` [PATCHv4 14/17] arm64: uaccess: remove set_fs() Mark Rutland
2020-11-16 17:40 ` Catalin Marinas [this message]
2020-11-17 10:44 ` Mark Rutland
2020-11-17 10:54 ` Catalin Marinas
2020-11-17 10:57 ` Mark Rutland
2020-11-17 11:02 ` Catalin Marinas
2020-11-17 11:07 ` Mark Rutland
2020-11-17 11:10 ` Catalin Marinas
2020-11-26 18:42 ` James Morse
2020-11-26 18:42 ` James Morse
2020-12-01 12:30 ` Mark Rutland
2020-11-13 12:49 ` [PATCHv4 15/17] arm64: uaccess: remove addr_limit_user_check() Mark Rutland
2020-11-13 12:49 ` [PATCHv4 16/17] arm64: uaccess: remove redundant PAN toggling Mark Rutland
2020-11-13 12:49 ` [PATCHv4 17/17] arm64: uaccess: remove vestigal UAO support Mark Rutland
2020-11-25 19:10 ` [PATCHv4 00/17] arm64: remove set_fs() and friends Catalin Marinas
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