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Sat, 2 Dec 2023 01:41:22 +0000 From: Volodymyr Babchuk To: "qemu-devel@nongnu.org" CC: David Woodhouse , Stefano Stabellini , Julien Grall , Volodymyr Babchuk , Anthony Perard , Paul Durrant , "open list:X86 Xen CPUs" Subject: [PATCH v4 3/6] xen: decouple generic xen code from legacy backends codebase Thread-Topic: [PATCH v4 3/6] xen: decouple generic xen code from legacy backends codebase Thread-Index: AQHaJMCnSKd/ZWVB1UiEphLKoDVW4A== Date: Sat, 2 Dec 2023 01:41:22 +0000 Message-ID: <20231202014108.2017803-4-volodymyr_babchuk@epam.com> References: <20231202014108.2017803-1-volodymyr_babchuk@epam.com> In-Reply-To: <20231202014108.2017803-1-volodymyr_babchuk@epam.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: git-send-email 2.42.0 x-ms-publictraffictype: Email x-ms-traffictypediagnostic: VI1PR03MB3710:EE_|AS8PR03MB7285:EE_ x-ms-office365-filtering-correlation-id: 7c35c8ea-f2f4-4658-e979-08dbf2d7ca0f x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; 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envelope-from=prvs=6700ee1bd8=volodymyr_babchuk@epam.com; helo=mx0b-0039f301.pphosted.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org In xen-all.c there are unneeded dependencies on xen-legacy-backend.c: - xen_init() uses xen_pv_printf() to report errors, but it does not provide a pointer to the struct XenLegacyDevice, so it is kind of useless, we can use standard error_report() instead. - xen-all.c has function xenstore_record_dm_state() which uses global variable "xenstore" defined and initialized in xen-legacy-backend.c It is used exactly once, so we can just open a new connection to the xenstore, update DM state and close connection back. Those two changes allows us to remove xen-legacy-backend.c at all, what should be done in the future anyways. But right now this patch moves us one step close to have QEMU build without legacy Xen backends. Signed-off-by: Volodymyr Babchuk Reviewed-by: Paul Durrant --- In v4: - New in v4, previous was part of "xen: add option to disable legacy backends" - Do not move xenstore global variable from xen-legacy-backend.c, instead use a local variable. --- accel/xen/xen-all.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/accel/xen/xen-all.c b/accel/xen/xen-all.c index 5ff0cb8bd9..6c2342581f 100644 --- a/accel/xen/xen-all.c +++ b/accel/xen/xen-all.c @@ -33,12 +33,20 @@ xendevicemodel_handle *xen_dmod; static void xenstore_record_dm_state(const char *state) { char path[50]; + struct qemu_xs_handle *xsh = qemu_xen_xs_open(); + + if (!xsh) { + error_report("error opening xenstore"); + exit(1); + } snprintf(path, sizeof (path), "device-model/%u/state", xen_domid); - if (!qemu_xen_xs_write(xenstore, XBT_NULL, path, state, strlen(state))) { + if (!qemu_xen_xs_write(xsh, XBT_NULL, path, state, strlen(state))) { error_report("error recording dm state"); exit(1); } + + qemu_xen_xs_close(xsh); } @@ -80,18 +88,18 @@ static int xen_init(MachineState *ms) xen_xc = xc_interface_open(0, 0, 0); if (xen_xc == NULL) { - xen_pv_printf(NULL, 0, "can't open xen interface\n"); + error_report("can't open xen interface\n"); return -1; } xen_fmem = xenforeignmemory_open(0, 0); if (xen_fmem == NULL) { - xen_pv_printf(NULL, 0, "can't open xen fmem interface\n"); + error_report("can't open xen fmem interface\n"); xc_interface_close(xen_xc); return -1; } xen_dmod = xendevicemodel_open(0, 0); if (xen_dmod == NULL) { - xen_pv_printf(NULL, 0, "can't open xen devicemodel interface\n"); + error_report("can't open xen devicemodel interface\n"); xenforeignmemory_close(xen_fmem); xc_interface_close(xen_xc); return -1;