vhost: correctly set bits of dirty pages
Fix two bugs in dirty page logging: When counting pages we should increase address by 1 instead of VHOST_PAGE_SIZE. Make log_write() correctly process requests that cross pages with write_address not starting at page boundary. Reported-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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@ -884,6 +884,7 @@ static int log_write(void __user *log_base,
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int r;
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if (!write_length)
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return 0;
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write_length += write_address % VHOST_PAGE_SIZE;
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write_address /= VHOST_PAGE_SIZE;
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for (;;) {
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u64 base = (u64)(unsigned long)log_base;
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@ -897,7 +898,7 @@ static int log_write(void __user *log_base,
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if (write_length <= VHOST_PAGE_SIZE)
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break;
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write_length -= VHOST_PAGE_SIZE;
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write_address += VHOST_PAGE_SIZE;
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write_address += 1;
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}
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return r;
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}
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