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Fri, 31 Jul 2026 03:34:32 -0700 (PDT) From: Jia Jia To: mst@redhat.com Cc: stefanha@redhat.com, kvm@vger.kernel.org, virtualization@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH v2 2/2] vhost/vsock: keep IOTLB across feature updates Date: Fri, 31 Jul 2026 18:34:14 +0800 Message-Id: <20260731103414.1746316-3-physicalmtea@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260731103414.1746316-1-physicalmtea@gmail.com> References: <20260730104857-mutt-send-email-mst@kernel.org> <20260731103414.1746316-1-physicalmtea@gmail.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit VHOST_SET_FEATURES is also used to update logging while a device is running. When ACCESS_PLATFORM stays enabled, allocating a new empty IOTLB on every call drops valid translations and forces avoidable misses. Initialize the device IOTLB only when one does not already exist. Signed-off-by: Jia Jia --- drivers/vhost/vsock.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c index 562b9e139a76..3703fd219039 100644 --- a/drivers/vhost/vsock.c +++ b/drivers/vhost/vsock.c @@ -893,7 +893,8 @@ static int vhost_vsock_set_features(struct vhost_vsock *vsock, u64 features) goto err; } - if ((features & (1ULL << VIRTIO_F_ACCESS_PLATFORM))) { + if ((features & (1ULL << VIRTIO_F_ACCESS_PLATFORM)) && + !vsock->dev.iotlb) { if (vhost_init_device_iotlb(&vsock->dev)) goto err; } -- 2.34.1