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authorBoqun Feng <boqun.feng@gmail.com>2019-11-26 10:17:20 +0800
committerDaniel Lezcano <daniel.lezcano@linaro.org>2020-01-16 19:07:09 +0100
commitddc61bbc45017726a2b450350d476b4dc5ae25ce (patch)
treeaacaf786a30fc8083fefa3470798f3709ca52938 /Documentation
parentclocksource: Fix Kconfig miscues (diff)
downloadlinux-dev-ddc61bbc45017726a2b450350d476b4dc5ae25ce.tar.xz
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clocksource/drivers/hyper-v: Reserve PAGE_SIZE space for tsc page
Currently, the reserved size for a tsc page is 4K, which is enough for communicating with hypervisor. However, in the case where we want to export the tsc page to userspace (e.g. for vDSO to read the clocksource), the tsc page should be at least PAGE_SIZE, otherwise, when PAGE_SIZE is larger than 4K, extra kernel data will be mapped into userspace, which means leaking kernel information. Therefore reserve PAGE_SIZE space for tsc_pg as a preparation for the vDSO support of ARM64 in the future. Also, while at it, replace all reference to tsc_pg with hv_get_tsc_page() since it should be the only interface to access tsc page. Signed-off-by: Boqun Feng (Microsoft) <boqun.feng@gmail.com> Cc: linux-hyperv@vger.kernel.org Reviewed-by: Michael Kelley <mikelley@microsoft.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Link: https://lore.kernel.org/r/20191126021723.4710-1-boqun.feng@gmail.com
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