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authorAlexander Mikhalitsyn <aleksandr.mikhalitsyn@canonical.com>2023-05-22 18:12:48 +0200
committerSean Christopherson <seanjc@google.com>2023-06-06 10:41:29 -0700
commit6d1bc9754b04075d938b47cf7f7800814b8911a7 (patch)
tree3b3d9297a4d92de6373498c8aabd0fe186f50c84 /arch/x86/kvm
parent791a089861fced01dc6d8a67507d711839659fb8 (diff)
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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')
-rw-r--r--arch/x86/kvm/svm/sev.c11
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