mirror of https://github.com/torvalds/linux.git
f58c9aa106
With PTW disabled system, bit _PAGE_DIRTY is a HW bit for page writing. However with PTW enabled system, bit _PAGE_WRITE is also a "HW bit" for page writing, because hardware synchronizes _PAGE_WRITE to _PAGE_DIRTY automatically. Previously, _PAGE_WRITE is treated as a SW bit to record the page writeable attribute for the fast page fault handling in the secondary MMU, however with PTW enabled machine, this bit is used by HW already (so setting it will silence the TLB modify exception). Here define KVM_PAGE_WRITEABLE with the SW bit _PAGE_MODIFIED, so that it can work on both PTW disabled and enabled machines. And for HW write bits, both _PAGE_DIRTY and _PAGE_WRITE are set or clear together. Cc: stable@vger.kernel.org Signed-off-by: Bibo Mao <maobibo@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> |
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