From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 54A083B47FB for ; Fri, 17 Apr 2026 10:58:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=13.77.154.182 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776423485; cv=none; b=OhudAB4we5OKcsYXZe9y6lJUPMRsl+oaRHYj1T4bh3Y8B7ehMyC8CXp7JHQeFxznWpXkoyugZ2r9PCz4Yg2UgqK3d/LfqGMDmgdRWeiuxL5/m6o+jw5+Z3tL6I5+pqwXkvg+Ak4LzJ/YvZDSmKtKozXsEjcTh0VH3uLQgSVLNFs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776423485; c=relaxed/simple; bh=MBQFFa+v7xkoMpZQU31SQoYNaehvQP6W6ZlK2Ndz3UQ=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=mqZ3pU2Zkn7WZYIEvcFq5Q/tmAxKu3LtqN1Ty0FRLwddK54BusSRu3KKto/pYVMj68vzj7RylLtvzPNb54omEaCfOexn3OgWaDP6kr6pSN5pPEAbE7b9XX1kcWkz7F/Hgs8VeWO0pfodWEUuykv8L8b676cZmeh3g2rPm7lqfyU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com; spf=pass smtp.mailfrom=linux.microsoft.com; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b=MyrIg/5c; arc=none smtp.client-ip=13.77.154.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b="MyrIg/5c" Received: from DESKTOP-TUU1E5L.fritz.box (p5086d620.dip0.t-ipconnect.de [80.134.214.32]) by linux.microsoft.com (Postfix) with ESMTPSA id 5D9B020B700D; Fri, 17 Apr 2026 03:58:01 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 5D9B020B700D DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1776423484; bh=fc1+1UtwU7yENZrAtYj54r8Jq6h7vAl8J9HXQQcnltg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MyrIg/5clsB9IB37QoTxF+UUkpHDOXUxXJtm3OypUnqpGZaeYsPA6p7qGhcP6ewVr HmUtjEiBGNr3hRNOMthU2JeOoNiS8SpmwP7RXsASlRxtzq3/lCUlgdKyMBVtAkQ4Qw MhSb5GCT7Q0EHE5ENndb4yaX6F+pERyPPdyFxeCE= From: Magnus Kulke To: qemu-devel@nongnu.org Cc: kvm@vger.kernel.org, Magnus Kulke , Wei Liu , "Michael S. Tsirkin" , =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= , Zhao Liu , Richard Henderson , Paolo Bonzini , Wei Liu , Magnus Kulke , Alex Williamson , Marcel Apfelbaum , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Marcelo Tosatti Subject: [PATCH 27/34] accel/mshv: write synthetic MSRs after migration Date: Fri, 17 Apr 2026 12:56:11 +0200 Message-Id: <20260417105618.3621-28-magnuskulke@linux.microsoft.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260417105618.3621-1-magnuskulke@linux.microsoft.com> References: <20260417105618.3621-1-magnuskulke@linux.microsoft.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Write partition-wide synthetic MSRs. This ensures the hypercall page and SynIC facilities are set up before vCPUs attempt to use it. Signed-off-by: Magnus Kulke --- accel/mshv/mshv-all.c | 7 +++++++ include/hw/hyperv/hvgdk_mini.h | 3 +++ include/system/mshv_int.h | 1 + target/i386/mshv/mshv-cpu.c | 15 +++++++++++++++ 4 files changed, 26 insertions(+) diff --git a/accel/mshv/mshv-all.c b/accel/mshv/mshv-all.c index 5f81881c05..e97f480551 100644 --- a/accel/mshv/mshv-all.c +++ b/accel/mshv/mshv-all.c @@ -137,6 +137,13 @@ static int mshv_load_setup(QEMUFile *f, void *opaque, Error **errp) static int mshv_load_cleanup(void *opaque) { MshvState *s = opaque; + int ret; + + ret = mshv_arch_set_partition_msrs(first_cpu); + if (ret < 0) { + error_report("Failed to set partition MSRs: %s", strerror(-ret)); + return -1; + } resume_vm(s->vm); diff --git a/include/hw/hyperv/hvgdk_mini.h b/include/hw/hyperv/hvgdk_mini.h index 75e953b86c..e987f59bb9 100644 --- a/include/hw/hyperv/hvgdk_mini.h +++ b/include/hw/hyperv/hvgdk_mini.h @@ -23,6 +23,9 @@ #define HV_X64_MSR_APIC_FREQUENCY 0x40000023 typedef enum hv_register_name { + /* VP Management Registers */ + HV_REGISTER_INTERNAL_ACTIVITY_STATE = 0x00000004, + /* Pending Interruption Register */ HV_REGISTER_PENDING_INTERRUPTION = 0x00010002, diff --git a/include/system/mshv_int.h b/include/system/mshv_int.h index 7d685fc647..7052f20a00 100644 --- a/include/system/mshv_int.h +++ b/include/system/mshv_int.h @@ -84,6 +84,7 @@ int mshv_get_generic_regs(CPUState *cpu, hv_register_assoc *assocs, size_t n_regs); int mshv_arch_store_vcpu_state(const CPUState *cpu); int mshv_arch_load_vcpu_state(CPUState *cpu); +int mshv_arch_set_partition_msrs(const CPUState *cpu); void mshv_arch_init_vcpu(CPUState *cpu); void mshv_arch_destroy_vcpu(CPUState *cpu); void mshv_arch_amend_proc_features( diff --git a/target/i386/mshv/mshv-cpu.c b/target/i386/mshv/mshv-cpu.c index 9ce66e9aa1..43dbbd6fbd 100644 --- a/target/i386/mshv/mshv-cpu.c +++ b/target/i386/mshv/mshv-cpu.c @@ -1115,6 +1115,21 @@ int mshv_arch_store_vcpu_state(const CPUState *cpu) return 0; } +int mshv_arch_set_partition_msrs(const CPUState *cpu) +{ + CPUX86State *env = &X86_CPU(cpu)->env; + struct hv_register_assoc assocs[] = { + { .name = HV_REGISTER_GUEST_OS_ID, + .value.reg64 = env->msr_hv_guest_os_id }, + { .name = HV_REGISTER_REFERENCE_TSC, + .value.reg64 = env->msr_hv_tsc }, + { .name = HV_X64_REGISTER_HYPERCALL, + .value.reg64 = env->msr_hv_hypercall }, + }; + + return mshv_set_generic_regs(cpu, assocs, ARRAY_SIZE(assocs)); +} + void mshv_arch_amend_proc_features( union hv_partition_synthetic_processor_features *features) { -- 2.34.1