From: Sean Christopherson <seanjc@google.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Ben Gardon <bgardon@google.com>, kvm <kvm@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Yanan Wang <wangyanan55@huawei.com>,
Andrew Jones <drjones@redhat.com>, Peter Xu <peterx@redhat.com>,
Aaron Lewis <aaronlewis@google.com>
Subject: Re: [PATCH 09/15] KVM: selftests: Move per-VM GPA into perf_test_args
Date: Thu, 11 Feb 2021 07:57:53 -0800 [thread overview]
Message-ID: <YCVUAdx3DYLPNwJU@google.com> (raw)
In-Reply-To: <756fed52-8151-97ee-11f2-91f150afab42@redhat.com>
On Thu, Feb 11, 2021, Paolo Bonzini wrote:
> On 11/02/21 02:56, Sean Christopherson wrote:
> > > > + pta->gpa = (vm_get_max_gfn(vm) - guest_num_pages) * pta->guest_page_size;
> > > > + pta->gpa &= ~(pta->host_page_size - 1);
> > > Also not related to this patch, but another case for align.
> > >
> > > > if (backing_src == VM_MEM_SRC_ANONYMOUS_THP ||
> > > > backing_src == VM_MEM_SRC_ANONYMOUS_HUGETLB)
> > > > - guest_test_phys_mem &= ~(KVM_UTIL_HUGEPAGE_ALIGNMENT - 1);
> > > > -
> > > > + pta->gpa &= ~(KVM_UTIL_HUGEPAGE_ALIGNMENT - 1);
> > > also align
> > >
> > > > #ifdef __s390x__
> > > > /* Align to 1M (segment size) */
> > > > - guest_test_phys_mem &= ~((1 << 20) - 1);
> > > > + pta->gpa &= ~((1 << 20) - 1);
> > > And here again (oof)
> >
> > Yep, I'll fix all these and the align() comment in v2.
>
> This is not exactly align in fact; it is x & ~y rather than (x + y) & ~y.
> Are you going to introduce a round-down macro or is it a bug? (I am
> lazy...).
Good question. I, too, was lazy. I didn't look at the guts of align() when I
moved it, and I didn't look closely at Ben's suggestion. I'll take a closer
look today and make sure everything is doing what it's supposed to do.
next prev parent reply other threads:[~2021-02-11 16:01 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-10 23:06 [PATCH 00/15] VM: selftests: Hugepage fixes and cleanups Sean Christopherson
2021-02-10 23:06 ` [PATCH 01/15] KVM: selftests: Explicitly state indicies for vm_guest_mode_params array Sean Christopherson
2021-02-11 0:50 ` Ben Gardon
2021-02-10 23:06 ` [PATCH 02/15] KVM: selftests: Expose align() helpers to tests Sean Christopherson
2021-02-11 0:49 ` Ben Gardon
2021-02-10 23:06 ` [PATCH 03/15] KVM: selftests: Align HVA for HugeTLB-backed memslots Sean Christopherson
2021-02-11 0:52 ` Ben Gardon
2021-02-25 7:40 ` wangyanan (Y)
2021-03-13 0:17 ` Sean Christopherson
2021-02-10 23:06 ` [PATCH 04/15] KVM: selftests: Force stronger HVA alignment (1gb) for hugepages Sean Christopherson
2021-02-25 7:57 ` wangyanan (Y)
2021-03-13 0:26 ` Sean Christopherson
2021-02-10 23:06 ` [PATCH 05/15] KVM: selftests: Require GPA to be aligned when backed by hugepages Sean Christopherson
2021-02-11 1:01 ` Ben Gardon
2021-02-10 23:06 ` [PATCH 06/15] KVM: selftests: Use shorthand local var to access struct perf_tests_args Sean Christopherson
2021-02-11 1:09 ` Ben Gardon
2021-02-10 23:06 ` [PATCH 07/15] KVM: selftests: Capture per-vCPU GPA in perf_test_vcpu_args Sean Christopherson
2021-02-11 1:24 ` Ben Gardon
2021-02-10 23:06 ` [PATCH 08/15] KVM: selftests: Use perf util's per-vCPU GPA/pages in demand paging test Sean Christopherson
2021-02-11 1:23 ` Ben Gardon
2021-02-10 23:06 ` [PATCH 09/15] KVM: selftests: Move per-VM GPA into perf_test_args Sean Christopherson
2021-02-11 1:22 ` Ben Gardon
2021-02-11 1:56 ` Sean Christopherson
2021-02-11 13:12 ` Paolo Bonzini
2021-02-11 15:57 ` Sean Christopherson [this message]
2021-02-11 17:33 ` Ben Gardon
2021-02-10 23:06 ` [PATCH 10/15] KVM: selftests: Remove perf_test_args.host_page_size Sean Christopherson
2021-02-11 1:26 ` Ben Gardon
2021-02-10 23:06 ` [PATCH 11/15] KVM: selftests: Create VM with adjusted number of guest pages for perf tests Sean Christopherson
2021-02-11 1:32 ` Ben Gardon
2021-02-10 23:06 ` [PATCH 12/15] KVM: selftests: Fill per-vCPU struct during "perf_test" VM creation Sean Christopherson
2021-02-10 23:06 ` [PATCH 13/15] KVM: selftests: Sync perf_test_args to guest during " Sean Christopherson
2021-02-10 23:06 ` [PATCH 14/15] KVM: selftests: Track size of per-VM memslot in perf_test_args Sean Christopherson
2021-02-10 23:06 ` [PATCH 15/15] KVM: selftests: Get rid of gorilla math in memslots modification test Sean Christopherson
2021-02-11 11:58 ` [PATCH 00/15] VM: selftests: Hugepage fixes and cleanups Andrew Jones
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