linux-kernel - Re: [PATCH 4/4] KVM: selftests: Allocate ucall pool from MEM_REGION

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Message-ID: <Y5ElcibE2CubONgm@google.com>
Date:   Wed, 7 Dec 2022 23:44:50 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Oliver Upton <oliver.upton@...ux.dev>
Cc:     Marc Zyngier <maz@...nel.org>, James Morse <james.morse@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Shuah Khan <shuah@...nel.org>,
        Andrew Jones <andrew.jones@...ux.dev>,
        Peter Gonda <pgonda@...gle.com>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        kvm@...r.kernel.org, kvmarm@...ts.linux.dev,
        Ricardo Koller <ricarkol@...gle.com>,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] KVM: selftests: Allocate ucall pool from
 MEM_REGION_DATA

On Wed, Dec 07, 2022, Oliver Upton wrote:
> MEM_REGION_TEST_DATA is meant to hold data explicitly used by a
> selftest, not implicit allocations due to the selftests infrastructure.
> Allocate the ucall pool from MEM_REGION_DATA much like the rest of the
> selftests library allocations.
> 
> Fixes: 426729b2cf2e ("KVM: selftests: Add ucall pool based implementation")

Not that it really matters because no one will backport this verbatim, but this
is the wrong commit to blame.  As of commit 426729b2cf2e, MEM_REGION_DATA does not
exist.  And similarly, the common ucall code didn't exist when Ricardo's series
introduced MEM_REGION_DATA.

  $ git show 426729b2cf2e:tools/testing/selftests/kvm/include/kvm_util_base.h | grep MEM_REGION_DATA
  $ git show 290c5b54012b7:tools/testing/selftests/kvm/lib/ucall_common.c
  fatal: path 'tools/testing/selftests/kvm/lib/ucall_common.c' exists on disk, but not in '290c5b54012b7'

The commit where the two collided is:

Fixes: cc7544101eec ("Merge tag 'kvmarm-6.2' of https://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD")

> Signed-off-by: Oliver Upton <oliver.upton@...ux.dev>
> ---

Fixes nit aside,

Reviewed-by: Sean Christopherson <seanjc@...gle.com>