[{"id":3674403,"web_url":"http://patchwork.ozlabs.org/comment/3674403/","msgid":"","list_archive_url":null,"date":"2026-04-07T11:00:27","subject":"Re: [PATCH v3 06/10] hw/tpm: Add support for VM migration with TPM\n CRB chunking","submitter":{"id":66774,"url":"http://patchwork.ozlabs.org/api/people/66774/","name":"Marc-André Lureau","email":"marcandre.lureau@redhat.com"},"content":"Hi\n\nOn Mon, Apr 6, 2026 at 6:18 PM Arun Menon wrote:\n>\n> From: Arun Menon \n>\n> - Add subsection in VMState for TPM CRB with the newly introduced\n> command and response buffers, along with a needed callback, so that\n> newer QEMU only sends the buffers if it is necessary.\n> - Add hw_compat blocker because the feature is only supported for\n> machine type 11.1 and higher.\n> - If the VM has no pending chunked TPM commands in the internal buffers\n> during a VM migration, or if the machine type does not support newly\n> introduced buffers, then the needed callback will return false, as it\n> checks the hw_compat blocker and thus the subsection will not be sent\n> to the destination host.\n>\n> Signed-off-by: Arun Menon \n> ---\n> hw/core/machine.c | 4 +++-\n> hw/tpm/tpm_crb.c | 31 +++++++++++++++++++++++++++++++\n> 2 files changed, 34 insertions(+), 1 deletion(-)\n>\n> diff --git a/hw/core/machine.c b/hw/core/machine.c\n> index 1abc8ae737..fb290c6c53 100644\n> --- a/hw/core/machine.c\n> +++ b/hw/core/machine.c\n> @@ -38,7 +38,9 @@\n> #include \"hw/acpi/generic_event_device.h\"\n> #include \"qemu/audio.h\"\n>\n> -GlobalProperty hw_compat_11_0[] = {};\n> +GlobalProperty hw_compat_11_0[] = {\n> + { \"tpm-crb\", \"migrate-buffers\", \"off\"},\n\nIf this is not intended to be user visible, we should use x- prefix\n\nThe problem is that the previous code changes expose CapChunk to the\nguest unconditionally.\n\nIf running with <=11.0 we should not enable chunk transfer by default\n- or we need to prevent/block migration... otherwise we may lose\nVM/device state, expose a differente device etc.\n\nWhat about having a \"cap-chunk\" property? Enable it by default with >=11.1.\n\nIf enabled when <=11.0, then also disable migration.\n\n> +};\n> const size_t hw_compat_11_0_len = G_N_ELEMENTS(hw_compat_11_0);\n>\n> GlobalProperty hw_compat_10_2[] = {\n> diff --git a/hw/tpm/tpm_crb.c b/hw/tpm/tpm_crb.c\n> index b9f295db7a..81471dd9f8 100644\n> --- a/hw/tpm/tpm_crb.c\n> +++ b/hw/tpm/tpm_crb.c\n> @@ -49,6 +49,8 @@ struct CRBState {\n>\n> bool ppi_enabled;\n> TPMPPI ppi;\n> +\n> + bool migrate_buffers;\n> };\n> typedef struct CRBState CRBState;\n>\n> @@ -345,18 +347,47 @@ static int tpm_crb_pre_save(void *opaque)\n> return 0;\n> }\n>\n> +static bool tpm_crb_chunk_needed(void *opaque)\n> +{\n> + CRBState *s = opaque;\n> +\n> + if (!s->migrate_buffers) {\n> + return false;\n> + }\n> +\n> + return ((s->command_buffer && s->command_buffer->len > 0) ||\n> + (s->response_buffer && s->response_buffer->len > 0));\n> +}\n> +\n> +static const VMStateDescription vmstate_tpm_crb_chunk = {\n> + .name = \"tpm-crb/chunk\",\n> + .version_id = 0,\n> + .needed = tpm_crb_chunk_needed,\n> + .fields = (const VMStateField[]) {\n> + VMSTATE_GBYTEARRAY(command_buffer, CRBState, 0),\n> + VMSTATE_GBYTEARRAY(response_buffer, CRBState, 0),\n> + VMSTATE_UINT32(response_offset, CRBState),\n> + VMSTATE_END_OF_LIST()\n> + }\n> +};\n> +\n> static const VMStateDescription vmstate_tpm_crb = {\n> .name = \"tpm-crb\",\n> .pre_save = tpm_crb_pre_save,\n> .fields = (const VMStateField[]) {\n> VMSTATE_UINT32_ARRAY(regs, CRBState, TPM_CRB_R_MAX),\n> VMSTATE_END_OF_LIST(),\n> + },\n> + .subsections = (const VMStateDescription * const []) {\n> + &vmstate_tpm_crb_chunk,\n> + NULL,\n> }\n> };\n>\n> static const Property tpm_crb_properties[] = {\n> DEFINE_PROP_TPMBE(\"tpmdev\", CRBState, tpmbe),\n> DEFINE_PROP_BOOL(\"ppi\", CRBState, ppi_enabled, true),\n> + DEFINE_PROP_BOOL(\"migrate-buffers\", CRBState, migrate_buffers, true),\n> };\n>\n> static void tpm_crb_reset(void *dev)\n> --\n> 2.53.0\n>","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=aFtuflKQ;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=google header.b=bcuRLCU+;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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Tsirkin\" , Yanan Wang ,\n Igor Mammedov ,\n =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= ","Content-Type":"text/plain; charset=\"UTF-8\"","Content-Transfer-Encoding":"quoted-printable","Received-SPF":"pass client-ip=170.10.129.124; envelope-from=mlureau@redhat.com;\n helo=us-smtp-delivery-124.mimecast.com","X-Spam_score_int":"-25","X-Spam_score":"-2.6","X-Spam_bar":"--","X-Spam_report":"(-2.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.54,\n DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001,\n RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001,\n SPF_HELO_PASS=-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":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"}},{"id":3675910,"web_url":"http://patchwork.ozlabs.org/comment/3675910/","msgid":"","list_archive_url":null,"date":"2026-04-10T14:39:55","subject":"Re: [PATCH v3 06/10] hw/tpm: Add support for VM migration with TPM\n CRB chunking","submitter":{"id":91136,"url":"http://patchwork.ozlabs.org/api/people/91136/","name":"Arun Menon","email":"armenon@redhat.com"},"content":"On Tue, Apr 07, 2026 at 03:00:27PM +0400, Marc-André Lureau wrote:\n> Hi\n> \n> On Mon, Apr 6, 2026 at 6:18 PM Arun Menon wrote:\n> >\n> > From: Arun Menon \n> >\n> > - Add subsection in VMState for TPM CRB with the newly introduced\n> > command and response buffers, along with a needed callback, so that\n> > newer QEMU only sends the buffers if it is necessary.\n> > - Add hw_compat blocker because the feature is only supported for\n> > machine type 11.1 and higher.\n> > - If the VM has no pending chunked TPM commands in the internal buffers\n> > during a VM migration, or if the machine type does not support newly\n> > introduced buffers, then the needed callback will return false, as it\n> > checks the hw_compat blocker and thus the subsection will not be sent\n> > to the destination host.\n> >\n> > Signed-off-by: Arun Menon \n> > ---\n> > hw/core/machine.c | 4 +++-\n> > hw/tpm/tpm_crb.c | 31 +++++++++++++++++++++++++++++++\n> > 2 files changed, 34 insertions(+), 1 deletion(-)\n> >\n> > diff --git a/hw/core/machine.c b/hw/core/machine.c\n> > index 1abc8ae737..fb290c6c53 100644\n> > --- a/hw/core/machine.c\n> > +++ b/hw/core/machine.c\n> > @@ -38,7 +38,9 @@\n> > #include \"hw/acpi/generic_event_device.h\"\n> > #include \"qemu/audio.h\"\n> >\n> > -GlobalProperty hw_compat_11_0[] = {};\n> > +GlobalProperty hw_compat_11_0[] = {\n> > + { \"tpm-crb\", \"migrate-buffers\", \"off\"},\n> \n> If this is not intended to be user visible, we should use x- prefix\n\nYes, I will add x- prefix.\n\n> \n> The problem is that the previous code changes expose CapChunk to the\n> guest unconditionally.\n> \n> If running with <=11.0 we should not enable chunk transfer by default\n> - or we need to prevent/block migration... otherwise we may lose\n> VM/device state, expose a differente device etc.\n> \n> What about having a \"cap-chunk\" property? Enable it by default with >=11.1.\n> \n> If enabled when <=11.0, then also disable migration.\n\nThis is really good insight. Similar to migrate-buffers, I need to make\nsure that the CapCRBChunk bit is set only when we are running the newer\nmachine type.\n\nI shall introduce a new entry in hw_compat array called x-cap-chunk.\nThat means, we should not unconditionally set the CapCRBChunk bit to 1.\nWe should set the bit based on cap_chunk property.\n\nHowever, I am a bit confused on the order of precedence of this variable.\nFrom what I understand, the device initialization happens first ->\nfollowed by the compat properties\n\nSo,\n\"DEFINE_PROP_BOOL(\"migrate-buffers\", CRBState, migrate_buffers, true)\"\ngets executed first setting it to true by default and then, the compat\nproperty is applied,\n\"GlobalProperty hw_compat_11_0[] = {\n { \"tpm-crb\", \"migrate-buffers\", \"off\"},\n}\"\nsetting it to false.\n\nWhen is the user provided command line argument parsed?\nFor example launching qemu using:\n -machine pc-11.0 \n -device tpm-crb,tpmdev=tpm0,cap-chunk=on\n\nIs it set in the end? In the above example, the user explicitly set\ncap-chunk to true whereas the migrate-buffers default value is false.\n\nTherefore we end up with the following scenario.\nSince chunking is supported, the guest writes a large command in the\nbuffer. The user then decides to migrate the VM. QEMU sees that\nmigrate-buffer is off, so it does not migrate the buffers. When the VM\nresumes on the destination host, it will find the buffers empty.\n\nTherefore, we need to stop migration if cap-chunk is enabled but\nmigrate-buffers is disabled. Please guide.\n\n> \n> > +};\n> > const size_t hw_compat_11_0_len = G_N_ELEMENTS(hw_compat_11_0);\n> >\n> > GlobalProperty hw_compat_10_2[] = {\n> > diff --git a/hw/tpm/tpm_crb.c b/hw/tpm/tpm_crb.c\n> > index b9f295db7a..81471dd9f8 100644\n> > --- a/hw/tpm/tpm_crb.c\n> > +++ b/hw/tpm/tpm_crb.c\n> > @@ -49,6 +49,8 @@ struct CRBState {\n> >\n> > bool ppi_enabled;\n> > TPMPPI ppi;\n> > +\n> > + bool migrate_buffers;\n> > };\n> > typedef struct CRBState CRBState;\n> >\n> > @@ -345,18 +347,47 @@ static int tpm_crb_pre_save(void *opaque)\n> > return 0;\n> > }\n> >\n> > +static bool tpm_crb_chunk_needed(void *opaque)\n> > +{\n> > + CRBState *s = opaque;\n> > +\n> > + if (!s->migrate_buffers) {\n> > + return false;\n> > + }\n> > +\n> > + return ((s->command_buffer && s->command_buffer->len > 0) ||\n> > + (s->response_buffer && s->response_buffer->len > 0));\n> > +}\n> > +\n> > +static const VMStateDescription vmstate_tpm_crb_chunk = {\n> > + .name = \"tpm-crb/chunk\",\n> > + .version_id = 0,\n> > + .needed = tpm_crb_chunk_needed,\n> > + .fields = (const VMStateField[]) {\n> > + VMSTATE_GBYTEARRAY(command_buffer, CRBState, 0),\n> > + VMSTATE_GBYTEARRAY(response_buffer, CRBState, 0),\n> > + VMSTATE_UINT32(response_offset, CRBState),\n> > + VMSTATE_END_OF_LIST()\n> > + }\n> > +};\n> > +\n> > static const VMStateDescription vmstate_tpm_crb = {\n> > .name = \"tpm-crb\",\n> > .pre_save = tpm_crb_pre_save,\n> > .fields = (const VMStateField[]) {\n> > VMSTATE_UINT32_ARRAY(regs, CRBState, TPM_CRB_R_MAX),\n> > VMSTATE_END_OF_LIST(),\n> > + },\n> > + .subsections = (const VMStateDescription * const []) {\n> > + &vmstate_tpm_crb_chunk,\n> > + NULL,\n> > }\n> > };\n> >\n> > static const Property tpm_crb_properties[] = {\n> > DEFINE_PROP_TPMBE(\"tpmdev\", CRBState, tpmbe),\n> > DEFINE_PROP_BOOL(\"ppi\", CRBState, ppi_enabled, true),\n> > + DEFINE_PROP_BOOL(\"migrate-buffers\", CRBState, migrate_buffers, true),\n> > };\n> >\n> > static void tpm_crb_reset(void *dev)\n> > --\n> > 2.53.0\n> >\n>\n\nRegards,\nArun Menon","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=MPx1HfU9;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=google header.b=T4KhN9QU;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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Tsirkin\" , Yanan Wang ,\n Igor Mammedov , Philippe =?iso-8859-1?q?Mathieu-Daud?=\n\t=?iso-8859-1?q?=E9?= ","Subject":"Re: [PATCH v3 06/10] hw/tpm: Add support for VM migration with TPM\n CRB chunking","Message-ID":"","References":"<20260406141735.25844-1-armenon@redhat.com>\n <20260406141735.25844-7-armenon@redhat.com>\n ","MIME-Version":"1.0","Content-Type":"text/plain; charset=utf-8","Content-Disposition":"inline","Content-Transfer-Encoding":"8bit","In-Reply-To":"\n ","Received-SPF":"pass client-ip=170.10.129.124; envelope-from=armenon@redhat.com;\n helo=us-smtp-delivery-124.mimecast.com","X-Spam_score_int":"-25","X-Spam_score":"-2.6","X-Spam_bar":"--","X-Spam_report":"(-2.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.54,\n DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001,\n RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001,\n SPF_HELO_PASS=-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":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"}},{"id":3675982,"web_url":"http://patchwork.ozlabs.org/comment/3675982/","msgid":"","list_archive_url":null,"date":"2026-04-10T16:39:52","subject":"Re: [PATCH v3 06/10] hw/tpm: Add support for VM migration with TPM\n CRB chunking","submitter":{"id":6442,"url":"http://patchwork.ozlabs.org/api/people/6442/","name":"Marc-André Lureau","email":"marcandre.lureau@gmail.com"},"content":"Hi\n\nOn Fri, Apr 10, 2026 at 6:41 PM Arun Menon wrote:\n>\n> However, I am a bit confused on the order of precedence of this variable.\n> From what I understand, the device initialization happens first ->\n> followed by the compat properties\n>\n> So,\n> \"DEFINE_PROP_BOOL(\"migrate-buffers\", CRBState, migrate_buffers, true)\"\n> gets executed first setting it to true by default and then, the compat\n> property is applied,\n> \"GlobalProperty hw_compat_11_0[] = {\n> { \"tpm-crb\", \"migrate-buffers\", \"off\"},\n> }\"\n> setting it to false.\n>\n> When is the user provided command line argument parsed?\n> For example launching qemu using:\n> -machine pc-11.0\n> -device tpm-crb,tpmdev=tpm0,cap-chunk=on\n>\n> Is it set in the end? In the above example, the user explicitly set\n> cap-chunk to true whereas the migrate-buffers default value is false.\n\nIirc, user specified property takes precedence over compat properties.\n\n> Therefore we end up with the following scenario.\n> Since chunking is supported, the guest writes a large command in the\n> buffer. The user then decides to migrate the VM. QEMU sees that\n> migrate-buffer is off, so it does not migrate the buffers. When the VM\n> resumes on the destination host, it will find the buffers empty.\n\n>\n> Therefore, we need to stop migration if cap-chunk is enabled but\n> migrate-buffers is disabled. Please guide.\n\nYes, if cap-chunk is enabled but migrate-buffer is off (compat 11.0),\nthere should be a migration blocker.","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=QO0vnyN9;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; helo=lists.gnu.org;\n envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n receiver=patchwork.ozlabs.org)"],"Received":["from lists.gnu.org (lists1p.gnu.org [209.51.188.17])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fsjGr75NCz1y2d\n\tfor ; Sat, 11 Apr 2026 02:40:51 +1000 (AEST)","from localhost ([::1] helo=lists1p.gnu.org)\n\tby lists.gnu.org with esmtp (Exim 4.90_1)\n\t(envelope-from )\n\tid 1wBEtv-0003W4-0R; 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