[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH] xen/public: Correct the documentation of where the Xen cpuid leaves can be found
Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> CC: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx> CC: Keir Fraser <keir@xxxxxxx> CC: Jan Beulich <JBeulich@xxxxxxxx> CC: Tim Deegan <tim@xxxxxxx> CC: Ian Campbell <Ian.Campbell@xxxxxxxxxx> CC: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx> --- xen/include/public/arch-x86/cpuid.h | 18 +++++++++++++----- 1 file changed, 13 insertions(+), 5 deletions(-) diff --git a/xen/include/public/arch-x86/cpuid.h b/xen/include/public/arch-x86/cpuid.h index e57a457..6005dfe 100644 --- a/xen/include/public/arch-x86/cpuid.h +++ b/xen/include/public/arch-x86/cpuid.h @@ -30,12 +30,20 @@ #ifndef __XEN_PUBLIC_ARCH_X86_CPUID_H__ #define __XEN_PUBLIC_ARCH_X86_CPUID_H__ -/* Xen identification leaves start at 0x40000000. */ +/* + * For compatibility with other hypervisor interfaces, the Xen cpuid leaves + * can be found at the first otherwise unused 0x100 aligned boundary starting + * from 0x40000000. + * + * e.g If viridian extensions are enabled for an HVM domain, the Xen cpuid + * leaves will start at 0x40000100 + */ + #define XEN_CPUID_FIRST_LEAF 0x40000000 #define XEN_CPUID_LEAF(i) (XEN_CPUID_FIRST_LEAF + (i)) /* - * Leaf 1 (0x40000000) + * Leaf 1 (0x40000x00) * EAX: Largest Xen-information leaf. All leaves up to an including @EAX * are supported by the Xen host. * EBX-EDX: "XenVMMXenVMM" signature, allowing positive identification @@ -46,14 +54,14 @@ #define XEN_CPUID_SIGNATURE_EDX 0x4d4d566e /* "nVMM" */ /* - * Leaf 2 (0x40000001) + * Leaf 2 (0x40000x01) * EAX[31:16]: Xen major version. * EAX[15: 0]: Xen minor version. * EBX-EDX: Reserved (currently all zeroes). */ /* - * Leaf 3 (0x40000002) + * Leaf 3 (0x40000x02) * EAX: Number of hypercall transfer pages. This register is always guaranteed * to specify one hypercall page. * EBX: Base address of Xen-specific MSRs. @@ -66,7 +74,7 @@ #define XEN_CPUID_FEAT1_MMU_PT_UPDATE_PRESERVE_AD (1u<<0) /* - * Leaf 5 (0x40000004) + * Leaf 5 (0x40000x04) * HVM-specific features */ -- 1.7.10.4 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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