| Message ID | 20240823232327.2408869-9-yunhong.jiang@linux.intel.com |
|---|---|
| State | New |
| Headers | show |
| Series | x86/hyperv: Support wakeup mailbox for VTL2 TDX guest | expand |
From: Yunhong Jiang <yunhong.jiang@linux.intel.com> > > The VTL2 TDX guest may have no sub-1M memory available, but it needs to > invoke trampoline_start64 to wake up the APs through the wakeup mailbox > mechanism. Set realmode_limit to 4G for the VTL2 TDX guest, so that > reserve_real_mode allocae memory under 4G. s/allocate/allocate/ Michael > > Signed-off-by: Yunhong Jiang <yunhong.jiang@linux.intel.com> > --- > arch/x86/hyperv/hv_vtl.c | 12 ++++++++---- > 1 file changed, 8 insertions(+), 4 deletions(-) > > diff --git a/arch/x86/hyperv/hv_vtl.c b/arch/x86/hyperv/hv_vtl.c > index e5aa2688cdd0..5829aac74f80 100644 > --- a/arch/x86/hyperv/hv_vtl.c > +++ b/arch/x86/hyperv/hv_vtl.c > @@ -40,11 +40,15 @@ void __init hv_vtl_init_platform(void) > { > pr_info("Linux runs in Hyper-V Virtual Trust Level\n"); > > - if (hv_isolation_type_tdx()) > + if (hv_isolation_type_tdx()) { > x86_platform.hyper.is_private_mmio = hv_is_private_mmio_tdx; > - x86_platform.realmode_reserve = x86_init_noop; > - x86_platform.realmode_init = x86_init_noop; > - real_mode_header = &hv_vtl_real_mode_header; > + x86_init.resources.realmode_limit = SZ_4G; > + x86_init.resources.reserve_bios = 0; > + } else { > + x86_platform.realmode_reserve = x86_init_noop; > + x86_platform.realmode_init = x86_init_noop; > + real_mode_header = &hv_vtl_real_mode_header; > + } > x86_init.irqs.pre_vector_init = x86_init_noop; > x86_init.timers.timer_init = x86_init_noop; > > -- > 2.25.1 >
diff --git a/arch/x86/hyperv/hv_vtl.c b/arch/x86/hyperv/hv_vtl.c index e5aa2688cdd0..5829aac74f80 100644 --- a/arch/x86/hyperv/hv_vtl.c +++ b/arch/x86/hyperv/hv_vtl.c @@ -40,11 +40,15 @@ void __init hv_vtl_init_platform(void) { pr_info("Linux runs in Hyper-V Virtual Trust Level\n"); - if (hv_isolation_type_tdx()) + if (hv_isolation_type_tdx()) { x86_platform.hyper.is_private_mmio = hv_is_private_mmio_tdx; - x86_platform.realmode_reserve = x86_init_noop; - x86_platform.realmode_init = x86_init_noop; - real_mode_header = &hv_vtl_real_mode_header; + x86_init.resources.realmode_limit = SZ_4G; + x86_init.resources.reserve_bios = 0; + } else { + x86_platform.realmode_reserve = x86_init_noop; + x86_platform.realmode_init = x86_init_noop; + real_mode_header = &hv_vtl_real_mode_header; + } x86_init.irqs.pre_vector_init = x86_init_noop; x86_init.timers.timer_init = x86_init_noop;
The VTL2 TDX guest may have no sub-1M memory available, but it needs to invoke trampoline_start64 to wake up the APs through the wakeup mailbox mechanism. Set realmode_limit to 4G for the VTL2 TDX guest, so that reserve_real_mode allocae memory under 4G. Signed-off-by: Yunhong Jiang <yunhong.jiang@linux.intel.com> --- arch/x86/hyperv/hv_vtl.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-)