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| author | Tom Lendacky <thomas.lendacky@amd.com> | 2020-12-10 18:09:54 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-12-15 11:20:51 +0100 |
| commit | 7ed9abfe8e9f62384f9b11c9fca19e551dbec5bd (patch) | |
| tree | 389f9ae52777cd6cefda824b5ddb22afe62334a5 /arch/x86/kvm/svm/svm.c | |
| parent | KVM: SVM: Support MMIO for an SEV-ES guest (diff) | |
| download | linux-7ed9abfe8e9f62384f9b11c9fca19e551dbec5bd.tar.xz linux-7ed9abfe8e9f62384f9b11c9fca19e551dbec5bd.zip | |
KVM: SVM: Support string IO operations for an SEV-ES guest
For an SEV-ES guest, string-based port IO 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.
For string-based port IO operations, invoke SEV-ES specific routines that
can complete the operation using common KVM port IO support.
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Message-Id: <9d61daf0ffda496703717218f415cdc8fd487100.1607620209.git.thomas.lendacky@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/svm/svm.c')
| -rw-r--r-- | arch/x86/kvm/svm/svm.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index 310de05d2479..18a46847bffc 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -2038,11 +2038,16 @@ static int io_interception(struct vcpu_svm *svm) ++svm->vcpu.stat.io_exits; string = (io_info & SVM_IOIO_STR_MASK) != 0; in = (io_info & SVM_IOIO_TYPE_MASK) != 0; - if (string) - return kvm_emulate_instruction(vcpu, 0); - port = io_info >> 16; size = (io_info & SVM_IOIO_SIZE_MASK) >> SVM_IOIO_SIZE_SHIFT; + + if (string) { + if (sev_es_guest(vcpu->kvm)) + return sev_es_string_io(svm, size, port, in); + else + return kvm_emulate_instruction(vcpu, 0); + } + svm->next_rip = svm->vmcb->control.exit_info_2; return kvm_fast_pio(&svm->vcpu, size, port, in); |