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| author | Mark Rutland <mark.rutland@arm.com> | 2020-12-02 13:15:47 +0000 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2020-12-02 19:46:14 +0000 |
| commit | a0ccf2ba689f773f2882b9c1e79d8a43a19cb513 (patch) | |
| tree | 1e934a4feafb46f63dcf394b4e224f51249bf718 /arch/arm64/kernel/sdei.c | |
| parent | d87a8e65b5101123a24cddeb7a8a2c7b45f7b60c (diff) | |
| download | linux-a0ccf2ba689f773f2882b9c1e79d8a43a19cb513.tar.bz2 | |
arm64: sdei: move uaccess logic to arch/arm64/
The SDEI support code is split across arch/arm64/ and drivers/firmware/,
largley this is split so that the arch-specific portions are under
arch/arm64, and the management logic is under drivers/firmware/.
However, exception entry fixups are currently under drivers/firmware.
Let's move the exception entry fixups under arch/arm64/. This
de-clutters the management logic, and puts all the arch-specific
portions in one place. Doing this also allows the fixups to be applied
earlier, so things like PAN and UAO will be in a known good state before
we run other logic. This will also make subsequent refactoring easier.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: James Morse <james.morse@arm.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20201202131558.39270-2-mark.rutland@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/kernel/sdei.c')
| -rw-r--r-- | arch/arm64/kernel/sdei.c | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/arch/arm64/kernel/sdei.c b/arch/arm64/kernel/sdei.c index 7689f2031c0c..4a5f24602aa0 100644 --- a/arch/arm64/kernel/sdei.c +++ b/arch/arm64/kernel/sdei.c @@ -178,12 +178,6 @@ static __kprobes unsigned long _sdei_handler(struct pt_regs *regs, sdei_api_event_context(i, ®s->regs[i]); } - /* - * We didn't take an exception to get here, set PAN. UAO will be cleared - * by sdei_event_handler()s force_uaccess_begin() call. - */ - __uaccess_enable_hw_pan(); - err = sdei_event_handler(regs, arg); if (err) return SDEI_EV_FAILED; @@ -227,6 +221,16 @@ asmlinkage __kprobes notrace unsigned long __sdei_handler(struct pt_regs *regs, struct sdei_registered_event *arg) { unsigned long ret; + mm_segment_t orig_addr_limit; + + /* + * We didn't take an exception to get here, so the HW hasn't set PAN or + * cleared UAO, and the exception entry code hasn't reset addr_limit. + * Set PAN, then use force_uaccess_begin() to clear UAO and reset + * addr_limit. + */ + __uaccess_enable_hw_pan(); + orig_addr_limit = force_uaccess_begin(); nmi_enter(); @@ -234,5 +238,7 @@ __sdei_handler(struct pt_regs *regs, struct sdei_registered_event *arg) nmi_exit(); + force_uaccess_end(orig_addr_limit); + return ret; } |