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| author | Tom Lendacky <thomas.lendacky@amd.com> | 2020-12-10 18:09:53 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-12-15 11:20:50 +0100 |
| commit | 8f423a80d299a5b3964b8af005d1aab4e5e9106a (patch) | |
| tree | 61876c26fe716a693140b408563c928b74da1c18 /arch/x86/kvm/x86.h | |
| parent | KVM: SVM: Create trace events for VMGEXIT MSR protocol processing (diff) | |
| download | linux-8f423a80d299a5b3964b8af005d1aab4e5e9106a.tar.xz linux-8f423a80d299a5b3964b8af005d1aab4e5e9106a.zip | |
KVM: SVM: Support MMIO for an SEV-ES guest
For an SEV-ES guest, MMIO is performed to a shared (un-encrypted) page
so that both the hypervisor and guest can read or write to it and each
see the contents.
The GHCB specification provides software-defined VMGEXIT exit codes to
indicate a request for an MMIO read or an MMIO write. Add support to
recognize the MMIO requests and invoke SEV-ES specific routines that
can complete the MMIO operation. These routines use common KVM support
to complete the MMIO operation.
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Message-Id: <af8de55127d5bcc3253d9b6084a0144c12307d4d.1607620209.git.thomas.lendacky@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/x86.h')
| -rw-r--r-- | arch/x86/kvm/x86.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h index bf812c89c2e3..046709f16abe 100644 --- a/arch/x86/kvm/x86.h +++ b/arch/x86/kvm/x86.h @@ -427,4 +427,9 @@ bool kvm_msr_allowed(struct kvm_vcpu *vcpu, u32 index, u32 type); __reserved_bits; \ }) +int kvm_sev_es_mmio_write(struct kvm_vcpu *vcpu, gpa_t src, unsigned int bytes, + void *dst); +int kvm_sev_es_mmio_read(struct kvm_vcpu *vcpu, gpa_t src, unsigned int bytes, + void *dst); + #endif |