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Subject[RFC PATCH v2 39/69] KVM: x86: Add guest_supported_xss placholder
From: Sean Christopherson <>

Add a per-vcpu placeholder for the support XSS of the guest so that the
TDX configuration code doesn't need to hack in manual computation of the
supported XSS. KVM XSS enabling is currently being upstreamed, i.e.
guest_supported_xss will no longer be a placeholder by the time TDX is
ready for upstreaming (hopefully).

Signed-off-by: Sean Christopherson <>
Signed-off-by: Isaku Yamahata <>
arch/x86/include/asm/kvm_host.h | 1 +
1 file changed, 1 insertion(+)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 7822b531a5e2..c641654307c6 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -656,6 +656,7 @@ struct kvm_vcpu_arch {

u64 xcr0;
u64 guest_supported_xcr0;
+ u64 guest_supported_xss;

struct kvm_pio_request pio;
void *pio_data;
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