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Message-Id: <20170724200303.12197-5-brijesh.singh@amd.com>
Date: Mon, 24 Jul 2017 15:02:41 -0500
From: Brijesh Singh <brijesh.singh@....com>
To: linux-kernel@...r.kernel.org, x86@...nel.org, kvm@...r.kernel.org
Cc: Thomas Gleixner <tglx@...utronix.de>, Borislav Petkov <bp@...e.de>,
Joerg Roedel <joro@...tes.org>,
"Michael S . Tsirkin" <mst@...hat.com>,
Paolo Bonzini <pbonzini@...hat.com>,
\"Radim Krčmář\"
<rkrcmar@...hat.com>, Tom Lendacky <thomas.lendacky@....com>,
Brijesh Singh <brijesh.singh@....com>
Subject: [RFC Part2 PATCH v3 04/26] 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>
Reviewed-by: Paolo Bonzini <pbonzini@...hat.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 6af04dd..46f41bb 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -511,6 +511,7 @@ 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;
@@ -768,6 +769,7 @@ 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;
gdt = get_current_gdt_rw();
sd->tss_desc = (struct kvm_ldttss_desc *)(gdt + GDT_ENTRY_TSS);
@@ -2072,7 +2074,7 @@ 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;
}
--
2.9.4
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