Signed-off-by: Teddy Astie <teddy.as...@vates.tech> --- 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 operating mode of the guest. HVM guest depends on whether the vCPU is operating in a 64bit segment or not [#mode]_. +If `XEN_HVM_CPUID_PHYS_ADDR_ABI` is supported, HVM guests can use a alternative +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. Parameters ---------- -- 2.49.0 Teddy Astie | Vates XCP-ng Developer XCP-ng & Xen Orchestra - Vates solutions web: https://vates.tech
