On 26.04.2021 19:54, Andrew Cooper wrote:
> VT-x has separate entry/exit control for loading guest/host state. Saving
> guest state on vmexit is performed unconditionally.
With the latter I find ...
> --- a/xen/arch/x86/hvm/vmx/vmcs.c
> +++ b/xen/arch/x86/hvm/vmx/vmcs.c
> @@ -2014,6 +2014,9 @@ void vmcs_dump_vcpu(struct vcpu *v)
> printk("RFLAGS=0x%08lx (0x%08lx) DR7 = 0x%016lx\n",
> vmr(GUEST_RFLAGS), regs->rflags,
> vmr(GUEST_DR7));
> + if ( vmentry_ctl & VM_ENTRY_LOAD_GUEST_CET )
> + printk("SSP = 0x%016lx S_CET = 0x%016lx ISST = 0x%016lx\n",
> + vmr(GUEST_SSP), vmr(GUEST_S_CET), vmr(GUEST_ISST));
... the conditional here a little odd, but I expect the plan is
to have the various bits all set consistently once actually
enabling the functionality.
Jan
