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Update the dump_vmcb() routine to output >>>> some of the SEV VMSA contents if possible. This can be useful for >>>> debug purposes. >>>> >>>> Signed-off-by: Tom Lendacky >>>> --- >>>> arch/x86/kvm/svm/sev.c | 98 ++++++++++++++++++++++++++++++++++++++++++ >>>> arch/x86/kvm/svm/svm.c | 13 ++++++ >>>> arch/x86/kvm/svm/svm.h | 11 +++++ >>>> 3 files changed, 122 insertions(+) >>>> >>>> diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c >>>> index 661108d65ee7..6e3f5042d9ce 100644 >>>> --- a/arch/x86/kvm/svm/sev.c >>>> +++ b/arch/x86/kvm/svm/sev.c >>> >>>> + >>>> + if (sev_snp_guest(vcpu->kvm)) { >>>> + struct sev_data_snp_dbg dbg = {0}; >>>> + >>>> + vmsa = snp_alloc_firmware_page(__GFP_ZERO); >>>> + if (!vmsa) >>>> + return NULL; >>>> + >>>> + dbg.gctx_paddr = __psp_pa(sev->snp_context); >>>> + dbg.src_addr = svm->vmcb->control.vmsa_pa; >>>> + dbg.dst_addr = __psp_pa(vmsa); >>>> + >>>> + ret = sev_issue_cmd(vcpu->kvm, SEV_CMD_SNP_DBG_DECRYPT, &dbg, &error); >>> >>> This can also be sev_do_cmd() where the file descriptor isn't checked. >>> Since it isn't really a user initiated call, that might be desirable since >>> this could also be useful for debugging during guest destruction (when the >>> file descriptor has already been closed) for VMSAs that haven't exited >>> with an INVALID exit code. >>> >>> Just an FYI, I can change this call and the one below to sev_do_cmd() if >>> agreed upon. >> >> Works for me. Want to provide a delta patch? I can fixup when applying. > > Will do. Here's the diff on top: diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index 6e3f5042d9ce..4e9ab172e3f0 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -5020,7 +5020,7 @@ struct vmcb_save_area *sev_decrypt_vmsa(struct kvm_vcpu *vcpu) dbg.src_addr = svm->vmcb->control.vmsa_pa; dbg.dst_addr = __psp_pa(vmsa); - ret = sev_issue_cmd(vcpu->kvm, SEV_CMD_SNP_DBG_DECRYPT, &dbg, &error); + ret = sev_do_cmd(SEV_CMD_SNP_DBG_DECRYPT, &dbg, &error); /* * Return the target page to a hypervisor page no matter what. @@ -5052,7 +5052,7 @@ struct vmcb_save_area *sev_decrypt_vmsa(struct kvm_vcpu *vcpu) dbg.dst_addr = __psp_pa(vmsa); dbg.len = PAGE_SIZE; - ret = sev_issue_cmd(vcpu->kvm, SEV_CMD_DBG_DECRYPT, &dbg, &error); + ret = sev_do_cmd(SEV_CMD_DBG_DECRYPT, &dbg, &error); if (ret) { pr_err("SEV: SEV_CMD_DBG_DECRYPT failed ret=%d, fw_error=%d (0x%x)\n", ret, error, error); > > Thanks, > Tom