From mboxrd@z Thu Jan 1 00:00:00 1970 From: Brijesh Singh Subject: [Part2 PATCH v4 09/29] KVM: SVM: Reserve ASID range for SEV guest Date: Tue, 19 Sep 2017 15:46:07 -0500 Message-ID: <20170919204627.3875-10-brijesh.singh@amd.com> References: <20170919204627.3875-1-brijesh.singh@amd.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Cc: Brijesh Singh , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Paolo Bonzini , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , Joerg Roedel , Borislav Petkov , Tom Lendacky , x86@kernel.org To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org Return-path: In-Reply-To: <20170919204627.3875-1-brijesh.singh@amd.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org A SEV-enabled guest must use ASIDs from the defined subset, while non-SEV guests can use the remaining ASID range. The range of ASID allowed SEV guest ASIDs is [1 - CPUID_8000_001F[ECX][31:0]]. Cc: Thomas Gleixner Cc: Ingo Molnar Cc: "H. Peter Anvin" Cc: Paolo Bonzini Cc: "Radim Krčmář" Cc: Joerg Roedel Cc: Borislav Petkov Cc: Tom Lendacky Cc: x86@kernel.org Cc: kvm@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Brijesh Singh --- arch/x86/kvm/svm.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index 2c3a3c88596c..360f4b90f48d 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -319,6 +319,8 @@ enum { #define VMCB_AVIC_APIC_BAR_MASK 0xFFFFFFFFFF000ULL +static unsigned int max_sev_asid; + static inline void mark_all_dirty(struct vmcb *vmcb) { vmcb->control.clean = 0; @@ -783,7 +785,7 @@ static int svm_hardware_enable(void) sd->asid_generation = 1; sd->max_asid = cpuid_ebx(SVM_CPUID_FUNC) - 1; sd->next_asid = sd->max_asid + 1; - sd->min_asid = 1; + sd->min_asid = max_sev_asid + 1; gdt = get_current_gdt_rw(); sd->tss_desc = (struct kvm_ldttss_desc *)(gdt + GDT_ENTRY_TSS); @@ -1050,6 +1052,15 @@ static int avic_ga_log_notifier(u32 ga_tag) return 0; } +/* + * Get maximum number of encrypted guest supported: Fn8001_001F[ECX]. + * [31:0]: Number of supported guest + */ +static __init void sev_hardware_setup(void) +{ + max_sev_asid = cpuid_ecx(0x8000001F); +} + static __init int svm_hardware_setup(void) { int cpu; @@ -1080,6 +1091,9 @@ static __init int svm_hardware_setup(void) kvm_tsc_scaling_ratio_frac_bits = 32; } + if (boot_cpu_has(X86_FEATURE_SEV)) + sev_hardware_setup(); + if (nested) { printk(KERN_INFO "kvm: Nested Virtualization enabled\n"); kvm_enable_efer_bits(EFER_SVME | EFER_LMSLE); -- 2.9.5