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| author |   Alexander Mikhalitsyn <aleksandr.mikhalitsyn@canonical.com> | 2023-05-22 18:12:48 +0200 |
|---|---|---|
| committer |   Sean Christopherson <seanjc@google.com> | 2023-06-06 10:41:29 -0700 |
| commit | 6d1bc9754b04075d938b47cf7f7800814b8911a7 (patch) | |
| tree | 3b3d9297a4d92de6373498c8aabd0fe186f50c84 /arch/x86/kvm/svm/sev.c | |
| parent | KVM: SVM: Invoke trace_kvm_exit() for fastpath VM-Exits (diff) | |
| download | wireguard-linux-6d1bc9754b04075d938b47cf7f7800814b8911a7.tar.xz wireguard-linux-6d1bc9754b04075d938b47cf7f7800814b8911a7.zip | |
KVM: SVM: enhance info printk's in SEV init
Let's print available ASID ranges for SEV/SEV-ES guests.
This information can be useful for system administrator
to debug if SEV/SEV-ES fails to enable.
There are a few reasons.
SEV:
- NPT is disabled (module parameter)
- CPU lacks some features (sev, decodeassists)
- Maximum SEV ASID is 0
SEV-ES:
- mmio_caching is disabled (module parameter)
- CPU lacks sev_es feature
- Minimum SEV ASID value is 1 (can be adjusted in BIOS/UEFI)
Cc: Sean Christopherson <seanjc@google.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Stéphane Graber <stgraber@ubuntu.com>
Cc: kvm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@canonical.com>
Link: https://lore.kernel.org/r/20230522161249.800829-3-aleksandr.mikhalitsyn@canonical.com
[sean: print '0' for min SEV-ES ASID if there are no available ASIDs]
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'arch/x86/kvm/svm/sev.c')
| -rw-r--r-- | arch/x86/kvm/svm/sev.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index 69ae5e1b3120..d65578d8784d 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -2219,7 +2219,6 @@ void __init sev_hardware_setup(void) if (misc_cg_set_capacity(MISC_CG_RES_SEV, sev_asid_count)) goto out; - pr_info("SEV supported: %u ASIDs\n", sev_asid_count); sev_supported = true; /* SEV-ES support requested? */ @@ -2247,10 +2246,18 @@ void __init sev_hardware_setup(void) if (misc_cg_set_capacity(MISC_CG_RES_SEV_ES, sev_es_asid_count)) goto out; - pr_info("SEV-ES supported: %u ASIDs\n", sev_es_asid_count); sev_es_supported = true; out: + if (boot_cpu_has(X86_FEATURE_SEV)) + pr_info("SEV %s (ASIDs %u - %u)\n", + sev_supported ? "enabled" : "disabled", + min_sev_asid, max_sev_asid); + if (boot_cpu_has(X86_FEATURE_SEV_ES)) + pr_info("SEV-ES %s (ASIDs %u - %u)\n", + sev_es_supported ? "enabled" : "disabled", + min_sev_asid > 1 ? 1 : 0, min_sev_asid - 1); + sev_enabled = sev_supported; sev_es_enabled = sev_es_supported; #endif |