On Thu, Jul 16, 2009 at 11:02:22AM -0700, Jordan Justen wrote: > Although VMX_EPT_IDENTITY_PAGETABLE_ADDR does not appear to be used within > qemu-kvm, this change mirrors a similar change in the kernel kvm code. > > The purpose is to move the KVM 'EPT Identity Pages' from: > 0xfffbc000-0xfffbcfff > to: > 0xfeffc000-0xfeffcfff > > The step is required to free up the 0xff000000-0xffffffff (16MB) range > for use with bios.bin. > > The KVM kernel change depends upon a change to kvm/bios/rombios.c so the bios > INT15-E820 function will properly reserve the new location. > > Signed-off-by: Jordan Justen <[email protected]> > --- > kvm/include/x86/asm/vmx.h | 2 +- > 1 files changed, 1 insertions(+), 1 deletions(-) > > diff --git a/kvm/include/x86/asm/vmx.h b/kvm/include/x86/asm/vmx.h > index df8d4f9..99e2bb9 100644 > --- a/kvm/include/x86/asm/vmx.h > +++ b/kvm/include/x86/asm/vmx.h > @@ -403,7 +403,7 @@ enum vmcs_field { > #define VMX_EPT_EXECUTABLE_MASK 0x4ull > #define VMX_EPT_IGMT_BIT (1ull << 6) > > -#define VMX_EPT_IDENTITY_PAGETABLE_ADDR 0xfffbc000ul > +#define VMX_EPT_IDENTITY_PAGETABLE_ADDR 0xfeffc000ul
Won't this conflict with an older BIOS? (the e820 reserved entry on older qemu-kvm+bios will not cover the EPT identity table on kernels with this patch). Perhaps add a new ioctl (similar to the tss one) to so userspace can set the address? > > > #define ASM_VMX_VMCLEAR_RAX ".byte 0x66, 0x0f, 0xc7, 0x30" > -- > 1.6.0.4 > > -- > To unsubscribe from this list: send the line "unsubscribe kvm" in > the body of a message to [email protected] > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
