On Mon, Dec 16, 2013 at 02:12:41PM +0000, James Hogan wrote: > From: Sanjay Lal <sanjayl@xxxxxxxxxxx> > > With larger set associative caches KVM can open the possibility of cache > aliasing between the memory that QEMU allocates with mmap and the > mapping into the guest address space. Therefore increase the target page > size to 16K when KVM is configured. > > Signed-off-by: Sanjay Lal <sanjayl@xxxxxxxxxxx> > Signed-off-by: James Hogan <james.hogan@xxxxxxxxxx> > Cc: Aurelien Jarno <aurelien@xxxxxxxxxxx> > --- > Changes in v2: > - Expand commit message > --- > target-mips/mips-defs.h | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/target-mips/mips-defs.h b/target-mips/mips-defs.h > index bf094a3..473ddf8 100644 > --- a/target-mips/mips-defs.h > +++ b/target-mips/mips-defs.h > @@ -5,7 +5,12 @@ > //#define USE_HOST_FLOAT_REGS > > /* Real pages are variable size... */ > +#ifdef CONFIG_KVM > +/* For KVM/MIPS the minimum page size is 16K due to cache aliasing issues */ > +#define TARGET_PAGE_BITS 14 > +#else > #define TARGET_PAGE_BITS 12 > +#endif > #define MIPS_TLB_MAX 128 > > #if defined(TARGET_MIPS64) I am not sure it is something correct. It means that the emulated CPU won't support 4K pages anymore, even when running in TCG mode without KVM. If the kernel maps a 4K page, in practice a 16K page is going to be mapped by the qemu tlb. -- Aurelien Jarno GPG: 1024D/F1BCDB73 aurelien@xxxxxxxxxxx http://www.aurel32.net -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
