* Tom Lendacky (thomas.lendacky@xxxxxxx) wrote:
> A guest only ever experiences, at most, 1 bit of reduced physical
> addressing. Update the documentation to reflect this as well as change
> the example value on the reduced-phys-bits option.
>
> Fixes: a9b4942f48 ("target/i386: add Secure Encrypted Virtualization (SEV) object")
> Signed-off-by: Tom Lendacky <thomas.lendacky@xxxxxxx>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@xxxxxxxxxx>
> ---
> qemu-options.hx | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/qemu-options.hx b/qemu-options.hx
> index 913c71e38f..3396085cf0 100644
> --- a/qemu-options.hx
> +++ b/qemu-options.hx
> @@ -5391,7 +5391,7 @@ SRST
> physical address space. The ``reduced-phys-bits`` is used to
> provide the number of bits we loose in physical address space.
> Similar to C-bit, the value is Host family dependent. On EPYC,
> - the value should be 5.
> + a guest will lose a maximum of 1 bit, so the value should be 1.
>
> The ``sev-device`` provides the device file to use for
> communicating with the SEV firmware running inside AMD Secure
> @@ -5426,7 +5426,7 @@ SRST
>
> # |qemu_system_x86| \\
> ...... \\
> - -object sev-guest,id=sev0,cbitpos=47,reduced-phys-bits=5 \\
> + -object sev-guest,id=sev0,cbitpos=47,reduced-phys-bits=1 \\
> -machine ...,memory-encryption=sev0 \\
> .....
>
> --
> 2.37.3
>
>
--
Dr. David Alan Gilbert / dgilbert@xxxxxxxxxx / Manchester, UK
