[{"id":3674371,"web_url":"http://patchwork.ozlabs.org/comment/3674371/","msgid":"","list_archive_url":null,"date":"2026-04-07T07:56:58","subject":"Re: [PATCH v3 03/10] hw/tpm: Add internal buffer state for chunking","submitter":{"id":66774,"url":"http://patchwork.ozlabs.org/api/people/66774/","name":"Marc-André Lureau","email":"marcandre.lureau@redhat.com"},"content":"On Mon, Apr 6, 2026 at 6:18 PM Arun Menon wrote:\n>\n> From: Arun Menon \n>\n> - Introduce GByteArray buffers to hold the command request and response\n> data during chunked TPM CRB transactions.\n> - Add helper function to clean them.\n>\n> Signed-off-by: Arun Menon \n\nReviewed-by: Marc-André Lureau \n\n> ---\n> hw/tpm/tpm_crb.c | 34 ++++++++++++++++++++++++++++++----\n> 1 file changed, 30 insertions(+), 4 deletions(-)\n>\n> diff --git a/hw/tpm/tpm_crb.c b/hw/tpm/tpm_crb.c\n> index bc55908786..d65b3e2cc1 100644\n> --- a/hw/tpm/tpm_crb.c\n> +++ b/hw/tpm/tpm_crb.c\n> @@ -38,10 +38,13 @@ struct CRBState {\n> TPMBackend *tpmbe;\n> TPMBackendCmd cmd;\n> uint32_t regs[TPM_CRB_R_MAX];\n> + size_t be_buffer_size;\n> MemoryRegion mmio;\n> MemoryRegion cmdmem;\n>\n> - size_t be_buffer_size;\n> + GByteArray *command_buffer;\n> + GByteArray *response_buffer;\n> + uint32_t response_offset;\n>\n> bool ppi_enabled;\n> TPMPPI ppi;\n> @@ -85,6 +88,13 @@ enum crb_cancel {\n>\n> #define TPM_CRB_NO_LOCALITY 0xff\n>\n> +static void tpm_crb_clear_internal_buffers(CRBState *s)\n> +{\n> + g_byte_array_set_size(s->response_buffer, 0);\n> + g_byte_array_set_size(s->command_buffer, 0);\n> + s->response_offset = 0;\n> +}\n> +\n> static uint64_t tpm_crb_mmio_read(void *opaque, hwaddr addr,\n> unsigned size)\n> {\n> @@ -134,9 +144,11 @@ static void tpm_crb_mmio_write(void *opaque, hwaddr addr,\n> }\n> break;\n> case A_CRB_CTRL_CANCEL:\n> - if (val == CRB_CANCEL_INVOKE &&\n> - s->regs[R_CRB_CTRL_START] & CRB_START_INVOKE) {\n> - tpm_backend_cancel_cmd(s->tpmbe);\n> + if (val == CRB_CANCEL_INVOKE) {\n> + if (s->regs[R_CRB_CTRL_START] & CRB_START_INVOKE) {\n> + tpm_backend_cancel_cmd(s->tpmbe);\n> + }\n> + tpm_crb_clear_internal_buffers(s);\n> }\n> break;\n> case A_CRB_CTRL_START:\n> @@ -240,6 +252,7 @@ static void tpm_crb_reset(void *dev)\n> tpm_ppi_reset(&s->ppi);\n> }\n> tpm_backend_reset(s->tpmbe);\n> + tpm_crb_clear_internal_buffers(s);\n>\n> memset(s->regs, 0, sizeof(s->regs));\n>\n> @@ -306,6 +319,9 @@ static void tpm_crb_realize(DeviceState *dev, Error **errp)\n> memory_region_add_subregion(get_system_memory(),\n> TPM_CRB_ADDR_BASE + sizeof(s->regs), &s->cmdmem);\n>\n> + s->command_buffer = g_byte_array_new();\n> + s->response_buffer = g_byte_array_new();\n> +\n> if (s->ppi_enabled) {\n> tpm_ppi_init(&s->ppi, get_system_memory(),\n> TPM_PPI_ADDR_BASE, OBJECT(s));\n> @@ -318,12 +334,22 @@ static void tpm_crb_realize(DeviceState *dev, Error **errp)\n> }\n> }\n>\n> +static void tpm_crb_unrealize(DeviceState *dev)\n> +{\n> + CRBState *s = CRB(dev);\n> +\n> + g_byte_array_unref(s->command_buffer);\n> + g_byte_array_unref(s->response_buffer);\n\nI have a preference for g_clear_pointer(&ptr, g_byte_array_unref), it\nis safer, but unrealize() should only be called once after realize()\nso ok.\n\n> +\n> +}\n> +\n> static void tpm_crb_class_init(ObjectClass *klass, const void *data)\n> {\n> DeviceClass *dc = DEVICE_CLASS(klass);\n> TPMIfClass *tc = TPM_IF_CLASS(klass);\n>\n> dc->realize = tpm_crb_realize;\n> + dc->unrealize = tpm_crb_unrealize;\n> device_class_set_props(dc, tpm_crb_properties);\n> dc->vmsd = &vmstate_tpm_crb;\n> dc->user_creatable = true;\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=VKE4VUNL;\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=EF/TchZ3;\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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Tue, 07 Apr 2026\n 00:57:11 -0700 (PDT)"],"MIME-Version":"1.0","References":"<20260406141735.25844-1-armenon@redhat.com>\n <20260406141735.25844-4-armenon@redhat.com>","In-Reply-To":"<20260406141735.25844-4-armenon@redhat.com>","From":"=?utf-8?q?Marc-Andr=C3=A9_Lureau?= ","Date":"Tue, 7 Apr 2026 11:56:58 +0400","X-Gm-Features":"AQROBzD0SE4tJJrizT42wl7xoz8BU99qQfsgKEzrQIpLucpnL9BYYhfAuzPwWNE","Message-ID":"\n ","Subject":"Re: [PATCH v3 03/10] hw/tpm: Add internal buffer state for chunking","To":"Arun Menon ","Cc":"qemu-devel@nongnu.org, Ani Sinha ,\n Laurent Vivier , Zhao Liu ,\n Stefan Berger ,\n Marcel Apfelbaum ,\n Paolo Bonzini , Fabiano Rosas ,\n \"Michael S. 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":3677671,"web_url":"http://patchwork.ozlabs.org/comment/3677671/","msgid":"","list_archive_url":null,"date":"2026-04-15T13:34:55","subject":"Re: [PATCH v3 03/10] hw/tpm: Add internal buffer state for 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 11:56:58AM +0400, Marc-André Lureau wrote:\n> On Mon, Apr 6, 2026 at 6:18 PM Arun Menon wrote:\n> >\n> > From: Arun Menon \n> >\n> > - Introduce GByteArray buffers to hold the command request and response\n> > data during chunked TPM CRB transactions.\n> > - Add helper function to clean them.\n> >\n> > Signed-off-by: Arun Menon \n>\n> Reviewed-by: Marc-André Lureau \n>\n> > ---\n> > hw/tpm/tpm_crb.c | 34 ++++++++++++++++++++++++++++++----\n> > 1 file changed, 30 insertions(+), 4 deletions(-)\n> >\n> > diff --git a/hw/tpm/tpm_crb.c b/hw/tpm/tpm_crb.c\n> > index bc55908786..d65b3e2cc1 100644\n> > --- a/hw/tpm/tpm_crb.c\n> > +++ b/hw/tpm/tpm_crb.c\n> > @@ -38,10 +38,13 @@ struct CRBState {\n> > TPMBackend *tpmbe;\n> > TPMBackendCmd cmd;\n> > uint32_t regs[TPM_CRB_R_MAX];\n> > + size_t be_buffer_size;\n> > MemoryRegion mmio;\n> > MemoryRegion cmdmem;\n> >\n> > - size_t be_buffer_size;\n> > + GByteArray *command_buffer;\n> > + GByteArray *response_buffer;\n> > + uint32_t response_offset;\n> >\n> > bool ppi_enabled;\n> > TPMPPI ppi;\n> > @@ -85,6 +88,13 @@ enum crb_cancel {\n> >\n> > #define TPM_CRB_NO_LOCALITY 0xff\n> >\n> > +static void tpm_crb_clear_internal_buffers(CRBState *s)\n> > +{\n> > + g_byte_array_set_size(s->response_buffer, 0);\n> > + g_byte_array_set_size(s->command_buffer, 0);\n> > + s->response_offset = 0;\n> > +}\n> > +\n> > static uint64_t tpm_crb_mmio_read(void *opaque, hwaddr addr,\n> > unsigned size)\n> > {\n> > @@ -134,9 +144,11 @@ static void tpm_crb_mmio_write(void *opaque, hwaddr addr,\n> > }\n> > break;\n> > case A_CRB_CTRL_CANCEL:\n> > - if (val == CRB_CANCEL_INVOKE &&\n> > - s->regs[R_CRB_CTRL_START] & CRB_START_INVOKE) {\n> > - tpm_backend_cancel_cmd(s->tpmbe);\n> > + if (val == CRB_CANCEL_INVOKE) {\n> > + if (s->regs[R_CRB_CTRL_START] & CRB_START_INVOKE) {\n> > + tpm_backend_cancel_cmd(s->tpmbe);\n> > + }\n> > + tpm_crb_clear_internal_buffers(s);\n> > }\n> > break;\n> > case A_CRB_CTRL_START:\n> > @@ -240,6 +252,7 @@ static void tpm_crb_reset(void *dev)\n> > tpm_ppi_reset(&s->ppi);\n> > }\n> > tpm_backend_reset(s->tpmbe);\n> > + tpm_crb_clear_internal_buffers(s);\n> >\n> > memset(s->regs, 0, sizeof(s->regs));\n> >\n> > @@ -306,6 +319,9 @@ static void tpm_crb_realize(DeviceState *dev, Error **errp)\n> > memory_region_add_subregion(get_system_memory(),\n> > TPM_CRB_ADDR_BASE + sizeof(s->regs), &s->cmdmem);\n> >\n> > + s->command_buffer = g_byte_array_new();\n> > + s->response_buffer = g_byte_array_new();\n> > +\n> > if (s->ppi_enabled) {\n> > tpm_ppi_init(&s->ppi, get_system_memory(),\n> > TPM_PPI_ADDR_BASE, OBJECT(s));\n> > @@ -318,12 +334,22 @@ static void tpm_crb_realize(DeviceState *dev, Error **errp)\n> > }\n> > }\n> >\n> > +static void tpm_crb_unrealize(DeviceState *dev)\n> > +{\n> > + CRBState *s = CRB(dev);\n> > +\n> > + g_byte_array_unref(s->command_buffer);\n> > + g_byte_array_unref(s->response_buffer);\n>\n> I have a preference for g_clear_pointer(&ptr, g_byte_array_unref), it\n> is safer, but unrealize() should only be called once after realize()\n> so ok.\n\nThanks for the tip. I have updated it to use g_clear_pointer in the next\nrevision.\n\n>\n> > +\n> > +}\n> > +\n> > static void tpm_crb_class_init(ObjectClass *klass, const void *data)\n> > {\n> > DeviceClass *dc = DEVICE_CLASS(klass);\n> > TPMIfClass *tc = TPM_IF_CLASS(klass);\n> >\n> > dc->realize = tpm_crb_realize;\n> > + dc->unrealize = tpm_crb_unrealize;\n> > device_class_set_props(dc, tpm_crb_properties);\n> > dc->vmsd = &vmstate_tpm_crb;\n> > dc->user_creatable = true;\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=dZ21gyBZ;\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=RgFCDCWa;\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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