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([192.19.161.250]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-2be4f80cc1dsm2237336eec.3.2026.03.06.17.06.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 06 Mar 2026 17:06:49 -0800 (PST) From: Alexey Makhalov To: x86@kernel.org, virtualization@lists.linux.dev, bp@alien8.de, hpa@zytor.com, dave.hansen@linux.intel.com, mingo@redhat.com, tglx@linutronix.de Cc: ajay.kaher@broadcom.com, brennan.lamoreaux@broadcom.com, bo.gan@broadcom.com, bcm-kernel-feedback-list@broadcom.com, linux-kernel@vger.kernel.org, kas@kernel.org, rick.p.edgecombe@intel.com, linux-coco@lists.linux.dev, Alexey Makhalov Subject: [PATCH 3/4] x86/vmware: Report guest crash to the hypervisor Date: Sat, 7 Mar 2026 00:42:37 +0000 Message-ID: <20260307004238.1181299-4-alexey.makhalov@broadcom.com> X-Mailer: git-send-email 2.43.7 In-Reply-To: <20260307004238.1181299-1-alexey.makhalov@broadcom.com> References: <20260307004238.1181299-1-alexey.makhalov@broadcom.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-DetectorID-Processed: b00c1d49-9d2e-4205-b15f-d015386d3d5e Content-Type: text/plain; charset="utf-8" Register the guest crash reporter to panic_notifier_list, which will be called at panic time. Guest crash reporter will report the crash to the hypervisor through a hypercall. Co-developed-by: Brennan Lamoreaux Signed-off-by: Brennan Lamoreaux Signed-off-by: Alexey Makhalov --- arch/x86/include/asm/vmware.h | 1 + arch/x86/kernel/cpu/vmware.c | 21 +++++++++++++++++++++ 2 files changed, 22 insertions(+) diff --git a/arch/x86/include/asm/vmware.h b/arch/x86/include/asm/vmware.h index c23164503e54..bf6141353774 100644 --- a/arch/x86/include/asm/vmware.h +++ b/arch/x86/include/asm/vmware.h @@ -97,6 +97,7 @@ #define VMWARE_CMD_GETHZ 45 #define VMWARE_CMD_GETVCPU_INFO 68 #define VMWARE_CMD_STEALCLOCK 91 +#define VMWARE_CMD_REPORTGUESTCRASH 102 /* * Hypercall command mask: * bits [6:0] command, range [0, 127] diff --git a/arch/x86/kernel/cpu/vmware.c b/arch/x86/kernel/cpu/vmware.c index d9753b1aba58..8997295a5a5c 100644 --- a/arch/x86/kernel/cpu/vmware.c +++ b/arch/x86/kernel/cpu/vmware.c @@ -31,6 +31,7 @@ #include #include #include +#include #include #include #include @@ -451,6 +452,24 @@ static void __init vmware_paravirt_ops_setup(void) #define vmware_paravirt_ops_setup() do {} while (0) #endif =20 +static int vmware_report_guest_crash(struct notifier_block *self, + unsigned long action, void *data) +{ + vmware_hypercall1(VMWARE_CMD_REPORTGUESTCRASH, 0); + return 0; +} + +static struct notifier_block guest_crash_reporter =3D { + .notifier_call =3D vmware_report_guest_crash +}; + +static int __init register_guest_crash_reporter(void) +{ + atomic_notifier_chain_register(&panic_notifier_list, + &guest_crash_reporter); + + return 0; +} /* * VMware hypervisor takes care of exporting a reliable TSC to the guest. * Still, due to timing difference when running on virtual cpus, the TSC c= an @@ -545,6 +564,8 @@ static void __init vmware_platform_setup(void) vmware_set_capabilities(); =20 kmsg_dump_register(&kmsg_dumper); + + register_guest_crash_reporter(); } =20 static u8 __init get_hypercall_mode(void) --=20 2.43.7