From: Borislav Petkov <bp@alien8.de>
To: Brijesh Singh <brijesh.singh@amd.com>
Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
"Thomas Gleixner" <tglx@linutronix.de>,
"Ingo Molnar" <mingo@redhat.com>,
"H. Peter Anvin" <hpa@zytor.com>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>,
"Joerg Roedel" <joro@8bytes.org>,
"Tom Lendacky" <thomas.lendacky@amd.com>,
x86@kernel.org
Subject: Re: [Part2 PATCH v7 23/38] KVM: SVM: Reserve ASID range for SEV guest
Date: Mon, 6 Nov 2017 11:34:12 +0100 [thread overview]
Message-ID: <20171106103412.ikr2ymvdjocvhcpo@pd.tnic> (raw)
In-Reply-To: <20171101211623.71496-24-brijesh.singh@amd.com>
On Wed, Nov 01, 2017 at 04:16:08PM -0500, Brijesh Singh wrote:
> A SEV-enabled guest must use ASIDs from the defined subset, while non-SEV
> guests can use the remaining ASID range. The range of allowed SEV guest
> ASIDs is [1 - CPUID_8000_001F[ECX][31:0]].
>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: Ingo Molnar <mingo@redhat.com>
> Cc: "H. Peter Anvin" <hpa@zytor.com>
> Cc: Paolo Bonzini <pbonzini@redhat.com>
> Cc: "Radim Krčmář" <rkrcmar@redhat.com>
> Cc: Joerg Roedel <joro@8bytes.org>
> Cc: Borislav Petkov <bp@suse.de>
> Cc: Tom Lendacky <thomas.lendacky@amd.com>
> Cc: x86@kernel.org
> Cc: kvm@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org
> Improvements-by: Borislav Petkov <bp@suse.de>
> Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
> Reviewed-by: Borislav Petkov <bp@suse.de>
> ---
> arch/x86/kvm/svm.c | 23 ++++++++++++++++++++++-
> 1 file changed, 22 insertions(+), 1 deletion(-)
>
> diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
> index be2e98c01b22..d4b62536e305 100644
> --- a/arch/x86/kvm/svm.c
> +++ b/arch/x86/kvm/svm.c
> @@ -323,6 +323,8 @@ 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;
> @@ -787,7 +789,7 @@ 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);
> @@ -1054,6 +1056,15 @@ static int avic_ga_log_notifier(u32 ga_tag)
> return 0;
> }
>
> +/*
> + * Get the maximum number of encrypted guests:
> + * Fn8001_001F[ECX][31:0]: Number of supported guests.
> + */
> +static __init void sev_hardware_setup(void)
> +{
> + max_sev_asid = cpuid_ecx(0x8000001F);
> +}
> +
> static __init int svm_hardware_setup(void)
> {
> int cpu;
> @@ -1084,6 +1095,16 @@ static __init int svm_hardware_setup(void)
> kvm_tsc_scaling_ratio_frac_bits = 32;
> }
>
> + if (sev) {
> + if (boot_cpu_has(X86_FEATURE_SEV) &&
> + IS_ENABLED(CONFIG_KVM_AMD_SEV)) {
> + sev_hardware_setup();
> + pr_info("SEV supported\n");
> + } else {
> + sev = false;
> + }
> + }
Btw, upon a second look, this hunk should go with the previous patch.
This patch deals with ASID ranges, as the commit message states.
--
Regards/Gruss,
Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
next prev parent reply other threads:[~2017-11-06 10:34 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-01 21:15 [Part2 PATCH v7 00/38] x86: Secure Encrypted Virtualization (AMD) Brijesh Singh
2017-11-01 21:15 ` [Part2 PATCH v7 01/38] Documentation/virtual/kvm: Add AMD Secure Encrypted Virtualization (SEV) Brijesh Singh
2017-11-01 21:15 ` [Part2 PATCH v7 02/38] x86/CPU/AMD: Add the Secure Encrypted Virtualization CPU feature Brijesh Singh
2017-11-01 21:15 ` [Part2 PATCH v7 03/38] kvm: svm: prepare for new bit definition in nested_ctl Brijesh Singh
2017-11-01 21:15 ` [Part2 PATCH v7 04/38] kvm: svm: Add SEV feature definitions to KVM Brijesh Singh
2017-11-01 21:15 ` [Part2 PATCH v7 05/38] KVM: SVM: Prepare to reserve asid for SEV guest Brijesh Singh
2017-11-01 21:15 ` [Part2 PATCH v7 06/38] KVM: X86: Extend CPUID range to include new leaf Brijesh Singh
2017-11-01 21:15 ` [Part2 PATCH v7 07/38] KVM: Introduce KVM_MEMORY_ENCRYPT_OP ioctl Brijesh Singh
2017-11-01 21:15 ` [Part2 PATCH v7 08/38] KVM: Introduce KVM_MEMORY_ENCRYPT_{UN,}REG_REGION ioctl Brijesh Singh
2017-11-01 21:15 ` [Part2 PATCH v7 09/38] crypto: ccp: Build the AMD secure processor driver only with AMD CPU support Brijesh Singh
2017-11-01 21:15 ` [Part2 PATCH v7 10/38] crypto: ccp: Define SEV userspace ioctl and command id Brijesh Singh
2017-11-01 21:15 ` [Part2 PATCH v7 11/38] crypto: ccp: Define SEV key management " Brijesh Singh
2017-11-01 21:15 ` [Part2 PATCH v7 12/38] crypto: ccp: Add Platform Security Processor (PSP) device support Brijesh Singh
2017-11-01 21:15 ` [Part2 PATCH v7 13/38] crypto: ccp: Add Secure Encrypted Virtualization (SEV) command support Brijesh Singh
2017-11-02 17:10 ` Borislav Petkov
2017-11-02 17:32 ` Brijesh Singh
2017-11-01 21:15 ` [Part2 PATCH v7 14/38] crypto: ccp: Implement SEV_FACTORY_RESET ioctl command Brijesh Singh
2017-11-03 12:42 ` Borislav Petkov
2017-11-01 21:16 ` [Part2 PATCH v7 15/38] crypto: ccp: Implement SEV_PLATFORM_STATUS " Brijesh Singh
2017-11-01 21:16 ` [Part2 PATCH v7 16/38] crypto: ccp: Implement SEV_PEK_GEN " Brijesh Singh
2017-11-01 21:16 ` [Part2 PATCH v7 17/38] crypto: ccp: Implement SEV_PDH_GEN " Brijesh Singh
2017-11-01 21:16 ` [Part2 PATCH v7 18/38] crypto: ccp: Implement SEV_PEK_CSR " Brijesh Singh
2017-11-03 19:42 ` Borislav Petkov
2017-11-03 20:01 ` Brijesh Singh
2017-11-01 21:16 ` [Part2 PATCH v7 19/38] crypto: ccp: Implement SEV_PEK_CERT_IMPORT " Brijesh Singh
2017-11-04 10:22 ` Borislav Petkov
2017-11-01 21:16 ` [Part2 PATCH v7 20/38] crypto: ccp: Implement SEV_PDH_CERT_EXPORT " Brijesh Singh
2017-11-05 11:34 ` Borislav Petkov
2017-11-06 16:16 ` Brijesh Singh
2017-11-01 21:16 ` [Part2 PATCH v7 21/38] KVM: X86: Add CONFIG_KVM_AMD_SEV Brijesh Singh
2017-11-01 21:16 ` [Part2 PATCH v7 22/38] KVM: SVM: Add sev module_param Brijesh Singh
2017-11-01 21:16 ` [Part2 PATCH v7 23/38] KVM: SVM: Reserve ASID range for SEV guest Brijesh Singh
2017-11-06 10:34 ` Borislav Petkov [this message]
2017-11-06 16:18 ` Brijesh Singh
2017-11-01 21:16 ` [Part2 PATCH v7 24/38] KVM: Define SEV key management command id Brijesh Singh
2017-11-01 21:16 ` [Part2 PATCH v7 25/38] KVM: SVM: Add KVM_SEV_INIT command Brijesh Singh
2017-11-06 10:57 ` Borislav Petkov
2017-11-06 16:19 ` Brijesh Singh
2017-11-01 21:16 ` [Part2 PATCH v7 26/38] KVM: SVM: VMRUN should use associated ASID when SEV is enabled Brijesh Singh
2017-11-01 21:16 ` [Part2 PATCH v7 27/38] KVM: SVM: Add support for KVM_SEV_LAUNCH_START command Brijesh Singh
2017-11-01 21:16 ` [Part2 PATCH v7 28/38] KVM: SVM: Add support for KVM_SEV_LAUNCH_UPDATE_DATA command Brijesh Singh
2017-11-01 21:16 ` [Part2 PATCH v7 29/38] KVM: SVM: Add support for KVM_SEV_LAUNCH_MEASURE command Brijesh Singh
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