[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] Add cmpxchg8b support for writable page tables
ChangeSet 1.1729, 2005/06/22 18:40:09+01:00, kaf24@xxxxxxxxxxxxxxxxxxxx Add cmpxchg8b support for writable page tables (emulation code path), which is needed to make atomic pae l1 page table updates work. Signed-off-by: Scott Parish <srparish@xxxxxxxxxx> mm.c | 22 +++++++++++++++++----- 1 files changed, 17 insertions(+), 5 deletions(-) diff -Nru a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c --- a/xen/arch/x86/mm.c 2005-06-22 14:01:34 -04:00 +++ b/xen/arch/x86/mm.c 2005-06-22 14:01:34 -04:00 @@ -2793,12 +2793,24 @@ return ptwr_emulated_update(addr, old, new, bytes, 1); } +static int ptwr_emulated_cmpxchg8b( + unsigned long addr, + unsigned long old, + unsigned long old_hi, + unsigned long new, + unsigned long new_hi) +{ + return ptwr_emulated_update( + addr, ((u64)old_hi << 32) | old, ((u64)new_hi << 32) | new, 8, 1); +} + static struct x86_mem_emulator ptwr_mem_emulator = { - .read_std = x86_emulate_read_std, - .write_std = x86_emulate_write_std, - .read_emulated = x86_emulate_read_std, - .write_emulated = ptwr_emulated_write, - .cmpxchg_emulated = ptwr_emulated_cmpxchg + .read_std = x86_emulate_read_std, + .write_std = x86_emulate_write_std, + .read_emulated = x86_emulate_read_std, + .write_emulated = ptwr_emulated_write, + .cmpxchg_emulated = ptwr_emulated_cmpxchg, + .cmpxchg8b_emulated = ptwr_emulated_cmpxchg8b }; /* Write page fault handler: check if guest is trying to modify a PTE. */ _______________________________________________ Xen-changelog mailing list Xen-changelog@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-changelog
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