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envelope-from=borntraeger@linux.ibm.com; helo=mx0b-001b2d01.pphosted.com X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 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: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Eric Farman virtio-ccw uses a single virtual CHPID for all devices and device-types, but vfio-ccw (passthrough) shares real CHPID information with the guest. A sufficiently large passthrough configuration would exceed the defined response payload. Fix this by limiting the number of CHPID descriptions that are returned based on the given response format. Cc: qemu-stable@nongnu.org Reviewed-by: Christian Borntraeger Signed-off-by: Eric Farman --- hw/s390x/css.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/hw/s390x/css.c b/hw/s390x/css.c index 96d5378f3c..29ba39f79e 100644 --- a/hw/s390x/css.c +++ b/hw/s390x/css.c @@ -1872,6 +1872,7 @@ int css_collect_chp_desc(int m, uint8_t cssid, uint8_t f_chpid, uint8_t l_chpid, int i, desc_size; uint32_t words[8]; uint32_t chpid_type_word; + uint32_t max_chpids, chpid_count = 0; CssImage *css; if (!m && !cssid) { @@ -1882,9 +1883,25 @@ int css_collect_chp_desc(int m, uint8_t cssid, uint8_t f_chpid, uint8_t l_chpid, if (!css) { return 0; } + + if (rfmt == 0) { + max_chpids = 256; + } else if (rfmt == 1) { + max_chpids = 127; + } else { + /* Should be rejected by caller */ + return 0; + } + desc_size = 0; for (i = f_chpid; i <= l_chpid; i++) { if (css->chpids[i].in_use) { + /* Limit number of CHPIDs sent back */ + if (chpid_count == max_chpids) { + break; + } + + chpid_count++; chpid_type_word = 0x80000000 | (css->chpids[i].type << 8) | i; if (rfmt == 0) { words[0] = cpu_to_be32(chpid_type_word); -- 2.53.0