Previously the KVM kernel module would allocate the address range
of 0xfffbc000-0xfffbcfff for the EPT Indentity Page Tables.
This change moves that to 0xfeffc000-0xfeffcfff.
Another issue related to this change is the VMC TSS Pages were
located at 0xfffbd000-0xfffbffff. This is controlled by the
qemu-kvm code. A separate change will move them to
0xfeffd000-0xfeffffff.
>From a high level, these are the effects of these two changes:
Previously, the KVM would only accommodate a 256KB BIOS image. With
these changes, the BIOS image may now grow to 16MB.
Motivation for making these changes:
A larger firmware image size allows alternative BIOS images to be
used with KVM. Some possible uses are to enable UEFI firmware
or coreboot firmware. Additionally, an alternative firmware might
include a linux kernel+initrd payload, which would require several
megabytes.
Signed-off-by: Jordan Justen <jordan.l.justen@xxxxxxxxx>
---
arch/x86/include/asm/vmx.h | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
index 272514c..0086332 100644
--- a/arch/x86/include/asm/vmx.h
+++ b/arch/x86/include/asm/vmx.h
@@ -372,7 +372,7 @@ 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
#define ASM_VMX_VMCLEAR_RAX ".byte 0x66, 0x0f, 0xc7, 0x30"
--
1.6.0.4
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