From: Sergey Senozhatsky <senozhatsky@chromium.org>
To: Paolo Bonzini <pbonzini@redhat.com>, David Matlack <dmatlack@google.com>
Cc: Sean Christopherson <seanjc@google.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
Suleiman Souhlal <suleiman@google.com>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
Sergey Senozhatsky <senozhatsky@chromium.org>
Subject: Re: [PATCHV2 3/3] KVM: x86: add KVM_SET_MMU_PREFETCH ioctl
Date: Wed, 20 Oct 2021 00:38:04 +0900 [thread overview]
Message-ID: <YW7mXF9DNLk4fVkQ@google.com> (raw)
In-Reply-To: <20211019153214.109519-4-senozhatsky@chromium.org>
On (21/10/20 00:32), Sergey Senozhatsky wrote:
> static int kvm_vm_ioctl_get_clock(struct kvm *kvm, void __user *argp)
> {
> struct kvm_clock_data data;
> @@ -6169,6 +6189,15 @@ long kvm_arch_vm_ioctl(struct file *filp,
> case KVM_X86_SET_MSR_FILTER:
> r = kvm_vm_ioctl_set_msr_filter(kvm, argp);
> break;
> + case KVM_SET_MMU_PREFETCH: {
> + u64 val;
> +
> + r = -EFAULT;
> + if (copy_from_user(&val, argp, sizeof(val)))
> + goto out;
> + r = kvm_arch_mmu_pte_prefetch(kvm, val);
> + break;
> + }
A side question: is there any value in turning this into a per-VCPU ioctl?
So that, say, on heterogeneous systems big cores can prefetch more than
little cores, for instance.
next prev parent reply other threads:[~2021-10-19 15:38 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-19 15:32 [PATCHV2 0/3] kvm: x86: make PTE_PREFETCH_NUM tunable Sergey Senozhatsky
2021-10-19 15:32 ` [PATCHV2 1/3] KVM: x86: introduce kvm_mmu_pte_prefetch structure Sergey Senozhatsky
2021-10-19 22:44 ` David Matlack
2021-10-20 1:23 ` Sergey Senozhatsky
2021-10-20 15:56 ` David Matlack
2021-10-21 2:48 ` Sergey Senozhatsky
2021-10-21 3:28 ` Sergey Senozhatsky
2021-10-21 8:09 ` Sergey Senozhatsky
2021-10-19 15:32 ` [PATCHV2 2/3] KVM: x86: use mmu_pte_prefetch for guest_walker Sergey Senozhatsky
2021-10-19 15:32 ` [PATCHV2 3/3] KVM: x86: add KVM_SET_MMU_PREFETCH ioctl Sergey Senozhatsky
2021-10-19 15:38 ` Sergey Senozhatsky [this message]
2021-11-08 21:47 ` Sean Christopherson
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