diff mbox series

[v2,8/9] x86/hyperv: Set realmode_limit to 4G for VTL2 TDX guest

Message ID 20240823232327.2408869-9-yunhong.jiang@linux.intel.com (mailing list archive)
State Handled Elsewhere, archived
Headers show
Series x86/hyperv: Support wakeup mailbox for VTL2 TDX guest | expand

Commit Message

Yunhong Jiang Aug. 23, 2024, 11:23 p.m. UTC
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(-)

Comments

Michael Kelley Sept. 2, 2024, 3:35 a.m. UTC | #1
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 mbox series

Patch

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;