On Tue, May 30, 2023 at 06:29:14PM +0100, Andrew Cooper wrote:
> ... I've changed this on commit to just "Automatic IBRS". The behaviour
> is more far complicated than this, and anyone who wants to know needs to
> read the manual extra carefully.
>
> For one, there's a behaviour which depends on
On 30/05/2023 2:58 pm, Alejandro Vallejo wrote:
> This is an AMD feature to reduce the IBRS handling overhead. Once enabled,
> processes running at CPL=0 are automatically IBRS-protected even if
> SPEC_CTRL.IBRS is not set. Furthermore, the RAS/RSB is cleared on VMEXIT.
>
> The feature is exposed i
This is an AMD feature to reduce the IBRS handling overhead. Once enabled,
processes running at CPL=0 are automatically IBRS-protected even if
SPEC_CTRL.IBRS is not set. Furthermore, the RAS/RSB is cleared on VMEXIT.
The feature is exposed in CPUID and toggled in EFER.
Signed-off-by: Alejandro Va
