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Date: Wed, 7 Jul 2021 13:35:58 -0500
From: Brijesh Singh <brijesh.singh@....com>
To: x86@...nel.org, linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
linux-efi@...r.kernel.org, platform-driver-x86@...r.kernel.org,
linux-coco@...ts.linux.dev, linux-mm@...ck.org,
linux-crypto@...r.kernel.org
Cc: Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Joerg Roedel <jroedel@...e.de>,
Tom Lendacky <thomas.lendacky@....com>,
"H. Peter Anvin" <hpa@...or.com>, Ard Biesheuvel <ardb@...nel.org>,
Paolo Bonzini <pbonzini@...hat.com>,
Sean Christopherson <seanjc@...gle.com>,
Vitaly Kuznetsov <vkuznets@...hat.com>,
Wanpeng Li <wanpengli@...cent.com>,
Jim Mattson <jmattson@...gle.com>,
Andy Lutomirski <luto@...nel.org>,
Dave Hansen <dave.hansen@...ux.intel.com>,
Sergio Lopez <slp@...hat.com>, Peter Gonda <pgonda@...gle.com>,
Peter Zijlstra <peterz@...radead.org>,
Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
David Rientjes <rientjes@...gle.com>,
Dov Murik <dovmurik@...ux.ibm.com>,
Tobin Feldman-Fitzthum <tobin@....com>,
Borislav Petkov <bp@...en8.de>,
Michael Roth <michael.roth@....com>,
Vlastimil Babka <vbabka@...e.cz>, tony.luck@...el.com,
npmccallum@...hat.com, brijesh.ksingh@...il.com,
Brijesh Singh <brijesh.singh@....com>
Subject: [PATCH Part2 RFC v4 22/40] KVM: SVM: Add KVM_SNP_INIT command
The KVM_SNP_INIT command is used by the hypervisor to initialize the
SEV-SNP platform context. In a typical workflow, this command should be the
first command issued. When creating SEV-SNP guest, the VMM must use this
command instead of the KVM_SEV_INIT or KVM_SEV_ES_INIT.
The flags value must be zero, it will be extended in future SNP support to
communicate the optional features (such as restricted INT injection etc).
Signed-off-by: Brijesh Singh <brijesh.singh@....com>
---
.../virt/kvm/amd-memory-encryption.rst | 16 ++++++++
arch/x86/kvm/svm/sev.c | 37 ++++++++++++++++++-
include/uapi/linux/kvm.h | 7 ++++
3 files changed, 58 insertions(+), 2 deletions(-)
diff --git a/Documentation/virt/kvm/amd-memory-encryption.rst b/Documentation/virt/kvm/amd-memory-encryption.rst
index 5c081c8c7164..75ca60b6d40a 100644
--- a/Documentation/virt/kvm/amd-memory-encryption.rst
+++ b/Documentation/virt/kvm/amd-memory-encryption.rst
@@ -427,6 +427,22 @@ issued by the hypervisor to make the guest ready for execution.
Returns: 0 on success, -negative on error
+18. KVM_SNP_INIT
+----------------
+
+The KVM_SNP_INIT command can be used by the hypervisor to initialize SEV-SNP
+context. In a typical workflow, this command should be the first command issued.
+
+Parameters (in): struct kvm_snp_init
+
+Returns: 0 on success, -negative on error
+
+::
+
+ struct kvm_snp_init {
+ __u64 flags; /* must be zero */
+ };
+
References
==========
diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
index abca2b9dee83..be31221f0a47 100644
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -228,10 +228,24 @@ static void sev_unbind_asid(struct kvm *kvm, unsigned int handle)
sev_guest_decommission(&decommission, NULL);
}
+static int verify_snp_init_flags(struct kvm *kvm, struct kvm_sev_cmd *argp)
+{
+ struct kvm_snp_init params;
+
+ if (copy_from_user(¶ms, (void __user *)(uintptr_t)argp->data, sizeof(params)))
+ return -EFAULT;
+
+ if (params.flags)
+ return -EINVAL;
+
+ return 0;
+}
+
static int sev_guest_init(struct kvm *kvm, struct kvm_sev_cmd *argp)
{
+ bool es_active = (argp->id == KVM_SEV_ES_INIT || argp->id == KVM_SEV_SNP_INIT);
struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
- bool es_active = argp->id == KVM_SEV_ES_INIT;
+ bool snp_active = argp->id == KVM_SEV_SNP_INIT;
int asid, ret;
if (kvm->created_vcpus)
@@ -242,12 +256,22 @@ static int sev_guest_init(struct kvm *kvm, struct kvm_sev_cmd *argp)
return ret;
sev->es_active = es_active;
+ sev->snp_active = snp_active;
asid = sev_asid_new(sev);
if (asid < 0)
goto e_no_asid;
sev->asid = asid;
- ret = sev_platform_init(&argp->error);
+ if (snp_active) {
+ ret = verify_snp_init_flags(kvm, argp);
+ if (ret)
+ goto e_free;
+
+ ret = sev_snp_init(&argp->error);
+ } else {
+ ret = sev_platform_init(&argp->error);
+ }
+
if (ret)
goto e_free;
@@ -591,6 +615,9 @@ static int sev_es_sync_vmsa(struct vcpu_svm *svm)
save->pkru = svm->vcpu.arch.pkru;
save->xss = svm->vcpu.arch.ia32_xss;
+ if (sev_snp_guest(svm->vcpu.kvm))
+ save->sev_features |= SVM_SEV_FEATURES_SNP_ACTIVE;
+
return 0;
}
@@ -1523,6 +1550,12 @@ int svm_mem_enc_op(struct kvm *kvm, void __user *argp)
}
switch (sev_cmd.id) {
+ case KVM_SEV_SNP_INIT:
+ if (!sev_snp_enabled) {
+ r = -ENOTTY;
+ goto out;
+ }
+ fallthrough;
case KVM_SEV_ES_INIT:
if (!sev_es_enabled) {
r = -ENOTTY;
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 3fd9a7e9d90c..989a64aa1ae5 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -1678,6 +1678,9 @@ enum sev_cmd_id {
/* Guest Migration Extension */
KVM_SEV_SEND_CANCEL,
+ /* SNP specific commands */
+ KVM_SEV_SNP_INIT = 256,
+
KVM_SEV_NR_MAX,
};
@@ -1774,6 +1777,10 @@ struct kvm_sev_receive_update_data {
__u32 trans_len;
};
+struct kvm_snp_init {
+ __u64 flags;
+};
+
#define KVM_DEV_ASSIGN_ENABLE_IOMMU (1 << 0)
#define KVM_DEV_ASSIGN_PCI_2_3 (1 << 1)
#define KVM_DEV_ASSIGN_MASK_INTX (1 << 2)
--
2.17.1
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