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a="65167442" X-IronPort-AV: E=Sophos;i="6.18,299,1751266800"; d="scan'208";a="65167442" X-CSE-ConnectionGUID: CdLddlw4SJaxES6pJdIpgA== X-CSE-MsgGUID: X8ml7fg4QmKMt7yblE/5qg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.18,299,1751266800"; d="scan'208";a="177810818" From: Zhenzhong Duan To: qemu-devel@nongnu.org Cc: alex.williamson@redhat.com, clg@redhat.com, eric.auger@redhat.com, steven.sistare@oracle.com, Zhenzhong Duan , Markus Armbruster Subject: [PATCH v2 5/6] accel/kvm: Fix an erroneous check on coalesced_mmio_ring Date: Sun, 28 Sep 2025 04:54:31 -0400 Message-ID: <20250928085432.40107-6-zhenzhong.duan@intel.com> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20250928085432.40107-1-zhenzhong.duan@intel.com> References: <20250928085432.40107-1-zhenzhong.duan@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=192.198.163.12; envelope-from=zhenzhong.duan@intel.com; helo=mgamail.intel.com X-Spam_score_int: -47 X-Spam_score: -4.8 X-Spam_bar: ---- X-Spam_report: (-4.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.442, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=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: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @intel.com) X-ZM-MESSAGEID: 1759049888855116600 Content-Type: text/plain; charset="utf-8" According to KVM uAPI, coalesced mmio page is KVM_COALESCED_MMIO_PAGE_OFFSET offset from kvm_run pages. For x86 it's 2 pages offset, for arm it's 1 page offset currently. We shouldn't presume it's hardcoded 1 page or else coalesced_mmio_ring will not be cleared in do_kvm_destroy_vcpu() in x86. Fixes: 7ed0919119b0 ("migration: close kvm after cpr") Cc: Markus Armbruster Signed-off-by: Zhenzhong Duan --- accel/kvm/kvm-all.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c index 9060599cd7..23fd491441 100644 --- a/accel/kvm/kvm-all.c +++ b/accel/kvm/kvm-all.c @@ -523,7 +523,8 @@ static int do_kvm_destroy_vcpu(CPUState *cpu) } =20 /* If I am the CPU that created coalesced_mmio_ring, then discard it */ - if (s->coalesced_mmio_ring =3D=3D (void *)cpu->kvm_run + PAGE_SIZE) { + if (s->coalesced_mmio_ring =3D=3D + (void *)cpu->kvm_run + s->coalesced_mmio * PAGE_SIZE) { s->coalesced_mmio_ring =3D NULL; } =20 --=20 2.47.1