On 12/10/20 11:10 AM, Tom Lendacky wrote:
> From: Tom Lendacky <[email protected]>
>
> An SEV-ES guest is started by invoking a new SEV initialization ioctl,
> KVM_SEV_ES_INIT. This identifies the guest as an SEV-ES guest, which is
> used to drive the appropriate ASID allocation, VMSA encryption, etc.
>
> Before being able to run an SEV-ES vCPU, the vCPU VMSA must be encrypted
> and measured. This is done using the LAUNCH_UPDATE_VMSA command after all
> calls to LAUNCH_UPDATE_DATA have been performed, but before LAUNCH_MEASURE
> has been performed. In order to establish the encrypted VMSA, the current
> (traditional) VMSA and the GPRs are synced to the page that will hold the
> encrypted VMSA and then LAUNCH_UPDATE_VMSA is invoked. The vCPU is then
> marked as having protected guest state.
>
> Signed-off-by: Tom Lendacky <[email protected]>
> ---
> +
> + /* Sync registgers */
> + save->rax = svm->vcpu.arch.regs[VCPU_REGS_RAX];
> + save->rbx = svm->vcpu.arch.regs[VCPU_REGS_RBX];
> + save->rcx = svm->vcpu.arch.regs[VCPU_REGS_RCX];
> + save->rdx = svm->vcpu.arch.regs[VCPU_REGS_RDX];
> + save->rsp = svm->vcpu.arch.regs[VCPU_REGS_RSP];
> + save->rbp = svm->vcpu.arch.regs[VCPU_REGS_RBP];
> + save->rsi = svm->vcpu.arch.regs[VCPU_REGS_RSI];
> + save->rdi = svm->vcpu.arch.regs[VCPU_REGS_RDI];
> + save->r8 = svm->vcpu.arch.regs[VCPU_REGS_R8];
> + save->r9 = svm->vcpu.arch.regs[VCPU_REGS_R9];
> + save->r10 = svm->vcpu.arch.regs[VCPU_REGS_R10];
> + save->r11 = svm->vcpu.arch.regs[VCPU_REGS_R11];
> + save->r12 = svm->vcpu.arch.regs[VCPU_REGS_R12];
> + save->r13 = svm->vcpu.arch.regs[VCPU_REGS_R13];
> + save->r14 = svm->vcpu.arch.regs[VCPU_REGS_R14];
> + save->r15 = svm->vcpu.arch.regs[VCPU_REGS_R15];
> + save->rip = svm->vcpu.arch.regs[VCPU_REGS_RIP];
> +
Paolo, I just noticed that a 32-bit build will fail because of R8-R15
references, sorry about that (I'm kind of surprised krobot hasn't
complained). This should take care of it:
---
diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
index 4045de7f8f8b..84b3ee15f4ec 100644
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -529,6 +529,7 @@ static int sev_es_sync_vmsa(struct vcpu_svm *svm)
save->rbp = svm->vcpu.arch.regs[VCPU_REGS_RBP];
save->rsi = svm->vcpu.arch.regs[VCPU_REGS_RSI];
save->rdi = svm->vcpu.arch.regs[VCPU_REGS_RDI];
+#ifdef X86_64
save->r8 = svm->vcpu.arch.regs[VCPU_REGS_R8];
save->r9 = svm->vcpu.arch.regs[VCPU_REGS_R9];
save->r10 = svm->vcpu.arch.regs[VCPU_REGS_R10];
@@ -537,6 +538,7 @@ static int sev_es_sync_vmsa(struct vcpu_svm *svm)
save->r13 = svm->vcpu.arch.regs[VCPU_REGS_R13];
save->r14 = svm->vcpu.arch.regs[VCPU_REGS_R14];
save->r15 = svm->vcpu.arch.regs[VCPU_REGS_R15];
+#endif
save->rip = svm->vcpu.arch.regs[VCPU_REGS_RIP];
/* Sync some non-GPR registers before encrypting */
