Doug / smarc-fsl-linux-kernel

31 Aug, 2007

1 commit

  • 8057d763e   Fix lguest page-pinning logic ("lguest: bad stack page 0xc057a000") ... Browse Code »

    If the stack pointer is 0xc057a000, then the first stack page is at
    0xc0579000 (the stack pointer is decremented before use). Not
    calculating this correctly caused guests with CONFIG_DEBUG_PAGEALLOC=y
    to be killed with a "bad stack page" message: the initial kernel stack
    was just proceeding the .smp_locks section which
    CONFIG_DEBUG_PAGEALLOC marks read-only when freeing.

    Thanks to Frederik Deweerdt for the bug report!

    Signed-off-by: Rusty Russell
    Signed-off-by: Linus Torvalds

    Rusty Russell
     

09 Aug, 2007

1 commit

  • 0d027c01c   lguest: Fix Malicious Guest GDT Host Crash ... Browse Code »

    If a Guest makes hypercall which sets a GDT entry to not present, we
    currently set any segment registers using that GDT entry to 0.
    Unfortunately, this is not sufficient: there are other ways of
    altering GDT entries which will cause a fault.

    The correct solution to do what Linux does: let them set any GDT value
    they want and handle the #GP when popping causes a fault. This has
    the added benefit of making our Switcher slightly more robust in the
    case of any other bugs which cause it to fault.

    We kill the Guest if it causes a fault in the Switcher: it's the
    Guest's responsibility to make sure it's not using segments when it
    changes them.

    Signed-off-by: Rusty Russell
    Signed-off-by: Linus Torvalds

    Rusty Russell
     

29 Jul, 2007

1 commit

  • 6c8dca5d5   Provide timespec to guests rather than jiffies clock. ... Browse Code »

    A non-periodic clock_event_device and the "jiffies" clock don't mix well:
    tick_handle_periodic() can go into an infinite loop.

    Currently lguest guests use the jiffies clock when the TSC is
    unusable. Instead, make the Host write the current time into the lguest
    page on every interrupt. This doesn't cost much but is more precise
    and at least as accurate as the jiffies clock. It also gets rid of
    the GET_WALLCLOCK hypercall.

    Also, delay setting sched_clock until our clock is set up, otherwise
    the early printk timestamps can go backwards (not harmful, just ugly).

    Signed-off-by: Rusty Russell
    Signed-off-by: Linus Torvalds

    Rusty Russell
     

27 Jul, 2007

3 commits

21 Jul, 2007

1 commit

  • e5faff45b   lguest: fix sense if IF flag on interrupt injection ... Browse Code »

    The sense of the IF bit is backwards in the host interrupt handling.

    This means we always save "IF=1" on the stack when injecting an
    interrupt. It turns out this is almost always correct (unless the
    guest is taking a page fault in an interrupt due to an unpopulated
    vmalloc mapping), so went unnoticed.

    Signed-off-by: Rusty Russell
    Signed-off-by: Linus Torvalds

    Rusty Russell
     

20 Jul, 2007

1 commit

  • d7e28ffe6   lguest: the host code ... Browse Code »

    This is the code for the "lg.ko" module, which allows lguest guests to
    be launched.

    [akpm@linux-foundation.org: update for futex-new-private-futexes]
    [akpm@linux-foundation.org: build fix]
    [jmorris@namei.org: lguest: use hrtimers]
    [akpm@linux-foundation.org: x86_64 build fix]
    Signed-off-by: Rusty Russell
    Cc: Andi Kleen
    Cc: Eric Dumazet
    Cc: Thomas Gleixner
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Rusty Russell