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AKwUvBygwfPJ2AcpsFcSuc8X2UxzziXeMwfQ6aoB22G2eP5+MX8IoCQTRdyKrzZmzEoYTSJXU06pYPPZvX1t5gUD+Gfh@lists.infradead.org X-Gm-Message-State: AFq9FYKB/lliwLNz85Wzu3/AH/XrlxSNsns0ihAkQVMNdy8pcA6RuqHG 3uAyJ+KzhSgo85HZM/yvk/kMK2J6HTSDXxqMWIge/hxHEpXrAuaElT43vCW7W91x2efzv2bodCr 4/PVslJKKXpsqS7j3ghC6qA== X-Received: from wmbgz7.prod.google.com ([2002:a05:600c:8887:b0:4a1:a2ef:38dc]) (user=vdonnefort job=prod-delivery.src-stubby-dispatcher) by 2002:a05:600c:3514:b0:4a1:d248:25c4 with SMTP id 5b1f17b1804b1-4a1fdb17706mr114255665e9.13.1792677733445; Thu, 22 Oct 2026 07:02:13 -0700 (PDT) Date: Thu, 22 Oct 2026 15:00:47 +0100 In-Reply-To: <20261022140048.2522787-1-vdonnefort@google.com> X-Archived-By: Mime-Version: 1.0 References: <20261022140048.2522787-1-vdonnefort@google.com> X-Mailer: git-send-email 2.56.0.257.gf7497c7d27-goog Message-ID: <20261022140048.2522787-4-vdonnefort@google.com> Subject: [PATCH v2 3/4] KVM: arm64: pkvm: Reset GICv3 LRs in the hypervisor From: Vincent Donnefort To: maz@kernel.org, oupton@kernel.org, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org Cc: joey.gouly@arm.com, seiden@linux.ibm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, catalin.marinas@arm.com, will@kernel.org, kernel-team@android.com, fuad.tabba@linux.dev, Vincent Donnefort Content-Type: text/plain; charset="UTF-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261022_070216_261602_1AD84796 X-CRM114-Status: GOOD ( 11.44 ) X-Spam-Score: -9.5 (---------) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" X-Spam-Status: No, score=-26.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIMWL_WL_MED,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT, USER_IN_DEF_DKIM_WL autolearn=ham autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 After the host is deprivileged, pKVM can't trust the host for resetting the vGIC LRs whose value is architecturally UNKNOWN when the CPU boots or resumes. Add a blanket cover in the CPU_ON/CPU_SUSPEND path. Fixes: cdf367192766 ("KVM: arm64: Intercept host's CPU_ON SMCs") Signed-off-by: Vincent Donnefort --- arch/arm64/kvm/hyp/nvhe/psci-relay.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/arm64/kvm/hyp/nvhe/psci-relay.c b/arch/arm64/kvm/hyp/nvhe/psci-relay.c index e20db999e328..890ced64fb18 100644 --- a/arch/arm64/kvm/hyp/nvhe/psci-relay.c +++ b/arch/arm64/kvm/hyp/nvhe/psci-relay.c @@ -213,6 +213,10 @@ static void __noreturn __kvm_host_psci_cpu_entry(unsigned long pc, unsigned long write_sysreg_el1(INIT_SCTLR_EL1_MMU_OFF, SYS_SCTLR); write_sysreg(INIT_PSTATE_EL1, SPSR_EL2); + /* We can't trust the host to reset those registers */ + if (hyp_gicv3_nr_lr) + __vgic_v3_init_lrs(); + trace_hyp_exit(host_ctxt, HYP_REASON_PSCI); __host_enter(host_ctxt); } -- 2.56.0.257.gf7497c7d27-goog