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charset="utf-8" Signed-off-by: Teddy Astie --- docs/guest-guide/x86/hypercall-abi.rst | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/docs/guest-guide/x86/hypercall-abi.rst b/docs/guest-guide/x86/= hypercall-abi.rst index e52ed453bc..710a02895b 100644 --- a/docs/guest-guide/x86/hypercall-abi.rst +++ b/docs/guest-guide/x86/hypercall-abi.rst @@ -35,6 +35,10 @@ The registers used for hypercalls depends on the operati= ng mode of the guest. HVM guest depends on whether the vCPU is operating in a 64bit segment or n= ot [#mode]_. =20 +If `XEN_HVM_CPUID_PHYS_ADDR_ABI` is supported, HVM guests can use a altern= ative +ABI where physical addresses are used for hypercall parameters instead of +linear addresses. This ABI can be used by tagging the hypercall index with +0x40000000. =20 Parameters ---------- --=20 2.49.0 Teddy Astie | Vates XCP-ng Developer XCP-ng & Xen Orchestra - Vates solutions web: https://vates.tech