linux-kernel - [RFC PATCH v1 19/28] KVM: SVM: prepare to reserve asid for SEV guest

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Date:   Mon, 22 Aug 2016 19:27:45 -0400
From:   Brijesh Singh <brijesh.singh@....com>
To:     <simon.guinot@...uanux.org>, <linux-efi@...r.kernel.org>,
        <brijesh.singh@....com>, <kvm@...r.kernel.org>,
        <rkrcmar@...hat.com>, <matt@...eblueprint.co.uk>,
        <linus.walleij@...aro.org>, <linux-mm@...ck.org>,
        <paul.gortmaker@...driver.com>, <hpa@...or.com>,
        <dan.j.williams@...el.com>, <aarcange@...hat.com>,
        <sfr@...b.auug.org.au>, <andriy.shevchenko@...ux.intel.com>,
        <herbert@...dor.apana.org.au>, <bhe@...hat.com>,
        <xemul@...allels.com>, <joro@...tes.org>, <x86@...nel.org>,
        <mingo@...hat.com>, <msalter@...hat.com>,
        <ross.zwisler@...ux.intel.com>, <bp@...e.de>, <dyoung@...hat.com>,
        <thomas.lendacky@....com>, <jroedel@...e.de>,
        <keescook@...omium.org>, <toshi.kani@....com>,
        <mathieu.desnoyers@...icios.com>, <devel@...uxdriverproject.org>,
        <tglx@...utronix.de>, <mchehab@...nel.org>,
        <iamjoonsoo.kim@....com>, <labbott@...oraproject.org>,
        <tony.luck@...el.com>, <alexandre.bounine@....com>,
        <kuleshovmail@...il.com>, <linux-kernel@...r.kernel.org>,
        <mcgrof@...nel.org>, <linux-crypto@...r.kernel.org>,
        <pbonzini@...hat.com>, <akpm@...ux-foundation.org>,
        <davem@...emloft.net>
Subject: [RFC PATCH v1 19/28] KVM: SVM: prepare to reserve asid for SEV guest

In current implementation, asid allocation starts from 1, this patch
adds a min_asid variable in svm_vcpu structure to allow starting asid
from something other than 1.

Signed-off-by: Brijesh Singh <brijesh.singh@....com>
---
 arch/x86/kvm/svm.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 211be94..f010b23 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -470,6 +470,7 @@ struct svm_cpu_data {
 	u64 asid_generation;
 	u32 max_asid;
 	u32 next_asid;
+	u32 min_asid;
 	struct kvm_ldttss_desc *tss_desc;
 
 	struct page *save_area;
@@ -726,6 +727,7 @@ 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;
 
 	native_store_gdt(&gdt_descr);
 	gdt = (struct desc_struct *)gdt_descr.address;
@@ -1887,7 +1889,7 @@ static void new_asid(struct vcpu_svm *svm, struct svm_cpu_data *sd)
 {
 	if (sd->next_asid > sd->max_asid) {
 		++sd->asid_generation;
-		sd->next_asid = 1;
+		sd->next_asid = sd->min_asid;
 		svm->vmcb->control.tlb_ctl = TLB_CONTROL_FLUSH_ALL_ASID;
 	}