kernel.git/drivers/lguest/core.c, branch linux-3.12.y

lguest: fix out-by-one error in address checking.

2015-06-03T09:33:07Z

commit 83a35114d0e4583e6b0ca39502e68b6a92e2910c upstream. This bug has been there since day 1; addresses in the top guest physical page weren't considered valid. You could map that page (the check in check_gpte() is correct), but if a guest tried to put a pagetable there we'd check that address manually when walking it, and kill the guest. Signed-off-by: Rusty Russell Signed-off-by: Linus Torvalds Signed-off-by: Jiri Slaby

lguest: map Switcher below fixmap.

2013-04-22T06:15:03Z

Now we've adjusted all the code, we can simply set switcher_addr to wherever it needs to go below the fixmaps, rather than asserting that it should be so. With large NR_CPUS and PAE, people were hitting the "mapping switcher would thwack fixmap" message. Reported-by: Paul Bolle Signed-off-by: Rusty Russell

lguest: don't share Switcher PTE pages between guests.

2013-04-22T06:15:01Z

We currently use the whole top PGD entry for the switcher, so we simply share a fixed page of PTEs between all guests (actually, it's one per Host CPU, to ensure isolation between guests). Changes to a scheme where every guest has its own mappings. Signed-off-by: Rusty Russell

lguest: expost switcher_pages array (as lg_switcher_pages).

2013-04-22T06:15:00Z

We will need this in page_table.c soon. Signed-off-by: Rusty Russell

lguest: assume Switcher text is a single page.

2013-04-22T06:01:36Z

ie. SHARED_SWITCHER_PAGES == 1. It is well under a page, and it's a minor simplification: it's nice to have *one* simplification in a patch series! Signed-off-by: Rusty Russell

lguest: rename switcher_page to switcher_pages.

2013-04-22T06:01:35Z

There is a single page with the Switcher in it, but it's followed by 2 pages per Host CPU. Signed-off-by: Rusty Russell

lguest: prepare to make SWITCHER_ADDR a variable.

2013-04-22T06:01:33Z

We currently use the whole top PGD entry for the switcher, but that's hitting the fixmap in some configurations (mainly, large NR_CPUS). Introduce a variable, currently set to the constant. Signed-off-by: Rusty Russell

lguest: fix typo

2012-12-18T04:49:06Z

Signed-off-by: Alex Russell Signed-off-by: Rusty Russell

lguest: move process freezing before pending signals check

2011-10-27T00:26:18Z

run_guest tries to freeze the current process after it has handled pending interrupts and before it calls lguest_arch_run_guest. This doesn't work nicely if the task has been killed while being frozen and when we want to handle that signal as soon as possible. Let's move try_to_freeze before we check for pending signal so that we can get out of the loop as soon as possible. Signed-off-by: Michal Hocko Acked-by: Rusty Russell Signed-off-by: Rusty Russell

lguest: Allow running under paravirt-enabled KVM.

2011-10-27T00:26:17Z

We actually can run under KVM, as it doesn't paravirtualize anything we need to use; reduce the check to checking we are the normal ringlevel. Reported-by: Stefanos Geraggelos Signed-off-by: Rusty Russell # HG changeset patch