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Wed, 02 Sep 2026 05:48:35 -0700 (PDT) From: Paul Durrant X-Google-Original-From: Paul Durrant Message-ID: <3ba65a4d-1c68-4518-acbb-893485a5dc2c@xen.org> Date: Wed, 2 Sep 2026 13:48:34 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 13/13] KVM: x86/xen: Convert evtchn_ports from IDR to XArray To: David Woodhouse , seanjc@google.com, pbonzini@redhat.com Cc: joao.m.martins@oracle.com, boris.ostrovsky@oracle.com, ankur.a.arora@oracle.com, tglx@kernel.org, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, x86@kernel.org, syzbot+208f7f3e5f59c11aeb90@syzkaller.appspotmail.com, syzkaller-bugs@googlegroups.com, suryasaimadhu369@gmail.com, lkp@intel.com, nicoyip.dev@gmail.com, frn1furkan10@gmail.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, imv4bel@gmail.com References: <20260831213632.81023-1-dwmw2@infradead.org> <20260831213632.81023-14-dwmw2@infradead.org> Content-Language: en-US In-Reply-To: <20260831213632.81023-14-dwmw2@infradead.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 31/08/2026 22:26, David Woodhouse wrote: > From: Furkan Caliskan > > IDR is deprecated in favor of XArray: see > Documentation/core-api/idr.rst. Convert evtchn_ports accordingly. > > kvm_xen_eventfd_assign()'s single-slot idr_alloc() becomes > xa_insert(), since it was really an insert-at-index, not an > allocation: -EBUSY replaces -ENOSPC, still mapped to -EEXIST. > > kvm_xen_hcall_evtchn_send() drops its explicit rcu_read_lock(), > since xa_load() takes its own RCU read-side section internally. > evtchnfd's lifetime is still guaranteed by kvm->srcu. > > xen_lock is left in place: it protects state beyond the map itself. > > Signed-off-by: Furkan Caliskan > Reviewed-by: David Woodhouse > Signed-off-by: David Woodhouse > --- > arch/x86/include/asm/kvm_host.h | 3 ++- > arch/x86/kvm/xen.c | 34 ++++++++++++++++----------------- > 2 files changed, 18 insertions(+), 19 deletions(-) > Reviewed-by: Paul Durrant