linux-kernel - [PATCH v11 07/35] KVM: x86: Add KVM_X86_SNP_VM vm

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Date: Sat, 30 Dec 2023 11:23:23 -0600
From: Michael Roth <michael.roth@....com>
To: <kvm@...r.kernel.org>
CC: <linux-coco@...ts.linux.dev>, <linux-mm@...ck.org>,
	<linux-crypto@...r.kernel.org>, <x86@...nel.org>,
	<linux-kernel@...r.kernel.org>, <tglx@...utronix.de>, <mingo@...hat.com>,
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	<ardb@...nel.org>, <pbonzini@...hat.com>, <seanjc@...gle.com>,
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	<pankaj.gupta@....com>, <liam.merwick@...cle.com>, <zhi.a.wang@...el.com>
Subject: [PATCH v11 07/35] KVM: x86: Add KVM_X86_SNP_VM vm_type

In some cases, such as detecting whether a page fault should be handled
as a private fault or not, KVM will need to handle things differently
versus the existing KVM_X86_PROTECTED_VM type.

Add a new KVM_X86_SNP_VM to allow for this, along with a helper to query
the vm_type.

Signed-off-by: Michael Roth <michael.roth@....com>
---
 arch/x86/include/asm/kvm_host.h |  2 ++
 arch/x86/include/uapi/asm/kvm.h |  1 +
 arch/x86/kvm/x86.c              | 20 +++++++++++++++++---
 3 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 63596fe45013..e38cab5dccae 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -2141,6 +2141,8 @@ void kvm_configure_mmu(bool enable_tdp, int tdp_forced_root_level,
 #define kvm_arch_has_private_mem(kvm) false
 #endif
 
+bool kvm_is_vm_type(struct kvm *kvm, unsigned long type);
+
 static inline u16 kvm_read_ldt(void)
 {
 	u16 ldt;
diff --git a/arch/x86/include/uapi/asm/kvm.h b/arch/x86/include/uapi/asm/kvm.h
index a448d0964fc0..57e4ba484aa2 100644
--- a/arch/x86/include/uapi/asm/kvm.h
+++ b/arch/x86/include/uapi/asm/kvm.h
@@ -564,5 +564,6 @@ struct kvm_pmu_event_filter {
 
 #define KVM_X86_DEFAULT_VM	0
 #define KVM_X86_SW_PROTECTED_VM	1
+#define KVM_X86_SNP_VM		3
 
 #endif /* _ASM_X86_KVM_H */
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index aaf71e5c1d18..87b78d63e81d 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4579,9 +4579,21 @@ static int kvm_ioctl_get_supported_hv_cpuid(struct kvm_vcpu *vcpu,
 
 static bool kvm_is_vm_type_supported(unsigned long type)
 {
-	return type == KVM_X86_DEFAULT_VM ||
-	       (type == KVM_X86_SW_PROTECTED_VM &&
-		IS_ENABLED(CONFIG_KVM_SW_PROTECTED_VM) && tdp_enabled);
+	if (type == KVM_X86_DEFAULT_VM)
+		return true;
+	else if (type == KVM_X86_SW_PROTECTED_VM &&
+		 IS_ENABLED(CONFIG_KVM_SW_PROTECTED_VM) && tdp_enabled)
+		return true;
+	else if (type == KVM_X86_SNP_VM &&
+		 IS_ENABLED(CONFIG_KVM_AMD_SEV) && tdp_enabled)
+		return true;
+
+	return false;
+}
+
+bool kvm_is_vm_type(struct kvm *kvm, unsigned long type)
+{
+	return kvm->arch.vm_type == type;
 }
 
 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
@@ -4784,6 +4796,8 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 		r = BIT(KVM_X86_DEFAULT_VM);
 		if (kvm_is_vm_type_supported(KVM_X86_SW_PROTECTED_VM))
 			r |= BIT(KVM_X86_SW_PROTECTED_VM);
+		if (kvm_is_vm_type_supported(KVM_X86_SNP_VM))
+			r |= BIT(KVM_X86_SNP_VM);
 		break;
 	default:
 		break;
-- 
2.25.1