[PATCH v2 0/2] Fix doorbell emulation for v2 API on PPC

[PATCH v2 0/2] Fix doorbell emulation for v2 API on PPC

[Gautam Menghani]

Doorbell emulation for KVM on PAPR guests is broken as support for DPDES
was not added in initial patch series [1].
Add DPDES support and doorbell handling support for V2 API. 

[1] lore.kernel.org/linuxppc-dev/20230914030600.16993-1-jniethe5@gmail.com

Changes in v2:
1. Split DPDES support into its own patch

Gautam Menghani (2):
  arch/powerpc/kvm: Add DPDES support in helper library for Guest state
    buffer
  arch/powerpc/kvm: Fix doorbell emulation for v2 API

 Documentation/arch/powerpc/kvm-nested.rst     | 4 +++-
 arch/powerpc/include/asm/guest-state-buffer.h | 3 ++-
 arch/powerpc/include/asm/kvm_book3s.h         | 1 +
 arch/powerpc/kvm/book3s_hv.c                  | 5 +++++
 arch/powerpc/kvm/book3s_hv_nestedv2.c         | 7 +++++++
 arch/powerpc/kvm/test-guest-state-buffer.c    | 2 +-
 6 files changed, 19 insertions(+), 3 deletions(-)

-- 
2.45.1

[PATCH v2 1/2] arch/powerpc/kvm: Add DPDES support in helper library for Guest state buffer

[Gautam Menghani]

Add support for using DPDES in the library for using guest state
buffers. DPDES support is needed for enabling usage of doorbells in a 
L2 KVM on PAPR guest.

Fixes: 6ccbbc33f06a ("KVM: PPC: Add helper library for Guest State Buffers")
Cc: stable@vger.kernel.org # v6.7
Signed-off-by: Gautam Menghani <gautam@linux.ibm.com>
---
 Documentation/arch/powerpc/kvm-nested.rst     | 4 +++-
 arch/powerpc/include/asm/guest-state-buffer.h | 3 ++-
 arch/powerpc/include/asm/kvm_book3s.h         | 1 +
 arch/powerpc/kvm/book3s_hv_nestedv2.c         | 7 +++++++
 arch/powerpc/kvm/test-guest-state-buffer.c    | 2 +-
 5 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/Documentation/arch/powerpc/kvm-nested.rst b/Documentation/arch/powerpc/kvm-nested.rst
index 630602a8aa00..5defd13cc6c1 100644
--- a/Documentation/arch/powerpc/kvm-nested.rst
+++ b/Documentation/arch/powerpc/kvm-nested.rst
@@ -546,7 +546,9 @@ table information.
 +--------+-------+----+--------+----------------------------------+
 | 0x1052 | 0x08  | RW |   T    | CTRL                             |
 +--------+-------+----+--------+----------------------------------+
-| 0x1053-|       |    |        | Reserved                         |
+| 0x1053 | 0x08  | RW |   T    | DPDES                            |
++--------+-------+----+--------+----------------------------------+
+| 0x1054-|       |    |        | Reserved                         |
 | 0x1FFF |       |    |        |                                  |
 +--------+-------+----+--------+----------------------------------+
 | 0x2000 | 0x04  | RW |   T    | CR                               |
diff --git a/arch/powerpc/include/asm/guest-state-buffer.h b/arch/powerpc/include/asm/guest-state-buffer.h
index 808149f31576..d107abe1468f 100644
--- a/arch/powerpc/include/asm/guest-state-buffer.h
+++ b/arch/powerpc/include/asm/guest-state-buffer.h
@@ -81,6 +81,7 @@
 #define KVMPPC_GSID_HASHKEYR			0x1050
 #define KVMPPC_GSID_HASHPKEYR			0x1051
 #define KVMPPC_GSID_CTRL			0x1052
+#define KVMPPC_GSID_DPDES			0x1053
 
 #define KVMPPC_GSID_CR				0x2000
 #define KVMPPC_GSID_PIDR			0x2001
@@ -110,7 +111,7 @@
 #define KVMPPC_GSE_META_COUNT (KVMPPC_GSE_META_END - KVMPPC_GSE_META_START + 1)
 
 #define KVMPPC_GSE_DW_REGS_START KVMPPC_GSID_GPR(0)
-#define KVMPPC_GSE_DW_REGS_END KVMPPC_GSID_CTRL
+#define KVMPPC_GSE_DW_REGS_END KVMPPC_GSID_DPDES
 #define KVMPPC_GSE_DW_REGS_COUNT \
 	(KVMPPC_GSE_DW_REGS_END - KVMPPC_GSE_DW_REGS_START + 1)
 
diff --git a/arch/powerpc/include/asm/kvm_book3s.h b/arch/powerpc/include/asm/kvm_book3s.h
index 3e1e2a698c9e..10618622d7ef 100644
--- a/arch/powerpc/include/asm/kvm_book3s.h
+++ b/arch/powerpc/include/asm/kvm_book3s.h
@@ -594,6 +594,7 @@ static inline u##size kvmppc_get_##reg(struct kvm_vcpu *vcpu)		\
 
 
 KVMPPC_BOOK3S_VCORE_ACCESSOR(vtb, 64, KVMPPC_GSID_VTB)
+KVMPPC_BOOK3S_VCORE_ACCESSOR(dpdes, 64, KVMPPC_GSID_DPDES)
 KVMPPC_BOOK3S_VCORE_ACCESSOR_GET(arch_compat, 32, KVMPPC_GSID_LOGICAL_PVR)
 KVMPPC_BOOK3S_VCORE_ACCESSOR_GET(lpcr, 64, KVMPPC_GSID_LPCR)
 KVMPPC_BOOK3S_VCORE_ACCESSOR_SET(tb_offset, 64, KVMPPC_GSID_TB_OFFSET)
diff --git a/arch/powerpc/kvm/book3s_hv_nestedv2.c b/arch/powerpc/kvm/book3s_hv_nestedv2.c
index 8e6f5355f08b..36863fff2a99 100644
--- a/arch/powerpc/kvm/book3s_hv_nestedv2.c
+++ b/arch/powerpc/kvm/book3s_hv_nestedv2.c
@@ -311,6 +311,10 @@ static int gs_msg_ops_vcpu_fill_info(struct kvmppc_gs_buff *gsb,
 			rc = kvmppc_gse_put_u64(gsb, iden,
 						vcpu->arch.vcore->vtb);
 			break;
+		case KVMPPC_GSID_DPDES:
+			rc = kvmppc_gse_put_u64(gsb, iden,
+						vcpu->arch.vcore->dpdes);
+			break;
 		case KVMPPC_GSID_LPCR:
 			rc = kvmppc_gse_put_u64(gsb, iden,
 						vcpu->arch.vcore->lpcr);
@@ -543,6 +547,9 @@ static int gs_msg_ops_vcpu_refresh_info(struct kvmppc_gs_msg *gsm,
 		case KVMPPC_GSID_VTB:
 			vcpu->arch.vcore->vtb = kvmppc_gse_get_u64(gse);
 			break;
+		case KVMPPC_GSID_DPDES:
+			vcpu->arch.vcore->dpdes = kvmppc_gse_get_u64(gse);
+			break;
 		case KVMPPC_GSID_LPCR:
 			vcpu->arch.vcore->lpcr = kvmppc_gse_get_u64(gse);
 			break;
diff --git a/arch/powerpc/kvm/test-guest-state-buffer.c b/arch/powerpc/kvm/test-guest-state-buffer.c
index 4720b8dc8837..2571ccc618c9 100644
--- a/arch/powerpc/kvm/test-guest-state-buffer.c
+++ b/arch/powerpc/kvm/test-guest-state-buffer.c
@@ -151,7 +151,7 @@ static void test_gs_bitmap(struct kunit *test)
 		i++;
 	}
 
-	for (u16 iden = KVMPPC_GSID_GPR(0); iden <= KVMPPC_GSID_CTRL; iden++) {
+	for (u16 iden = KVMPPC_GSID_GPR(0); iden <= KVMPPC_GSE_DW_REGS_END; iden++) {
 		kvmppc_gsbm_set(&gsbm, iden);
 		kvmppc_gsbm_set(&gsbm1, iden);
 		KUNIT_EXPECT_TRUE(test, kvmppc_gsbm_test(&gsbm, iden));
-- 
2.45.1

[PATCH v2 2/2] arch/powerpc/kvm: Fix doorbell emulation for v2 API

[Gautam Menghani]

Doorbell emulation is broken for KVM on PAPR guests as support for
DPDES was not added in the initial patch series. Due to this, a KVM on
PAPR guest with SMT > 1 cannot be booted with the XICS interrupt
controller as doorbells are setup in the initial probe path when using XICS
(pSeries_smp_probe()).

Command to replicate the above bug:

qemu-system-ppc64 \
	-drive file=rhel.qcow2,format=qcow2 \
	-m 20G \
	-smp 8,cores=1,threads=8 \
	-cpu  host \
	-nographic \
	-machine pseries,ic-mode=xics -accel kvm

Add doorbell state handling support in the host
KVM code to fix doorbell emulation.

Fixes: 19d31c5f1157 ("KVM: PPC: Add support for nestedv2 guests")
Cc: stable@vger.kernel.org # v6.7
Signed-off-by: Gautam Menghani <gautam@linux.ibm.com>
---
 arch/powerpc/kvm/book3s_hv.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 35cb014a0c51..21c69647d27c 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -4116,6 +4116,11 @@ static int kvmhv_vcpu_entry_nestedv2(struct kvm_vcpu *vcpu, u64 time_limit,
 	int trap;
 	long rc;
 
+	if (vcpu->arch.doorbell_request) {
+		vcpu->arch.doorbell_request = 0;
+		kvmppc_set_dpdes(vcpu, 1);
+	}
+
 	io = &vcpu->arch.nestedv2_io;
 
 	msr = mfmsr();
-- 
2.45.1

Re: [PATCH v2 1/2] arch/powerpc/kvm: Add DPDES support in helper library for Guest state buffer

[Nicholas Piggin]

On Wed Jun 5, 2024 at 9:39 PM AEST, Gautam Menghani wrote:
> Add support for using DPDES in the library for using guest state
> buffers. DPDES support is needed for enabling usage of doorbells in a 
> L2 KVM on PAPR guest.
>

Reviewed-by: Nicholas Piggin <npiggin@gmail.com>

> Fixes: 6ccbbc33f06a ("KVM: PPC: Add helper library for Guest State Buffers")
> Cc: stable@vger.kernel.org # v6.7
> Signed-off-by: Gautam Menghani <gautam@linux.ibm.com>
> ---
>  Documentation/arch/powerpc/kvm-nested.rst     | 4 +++-
>  arch/powerpc/include/asm/guest-state-buffer.h | 3 ++-
>  arch/powerpc/include/asm/kvm_book3s.h         | 1 +
>  arch/powerpc/kvm/book3s_hv_nestedv2.c         | 7 +++++++
>  arch/powerpc/kvm/test-guest-state-buffer.c    | 2 +-
>  5 files changed, 14 insertions(+), 3 deletions(-)
>
> diff --git a/Documentation/arch/powerpc/kvm-nested.rst b/Documentation/arch/powerpc/kvm-nested.rst
> index 630602a8aa00..5defd13cc6c1 100644
> --- a/Documentation/arch/powerpc/kvm-nested.rst
> +++ b/Documentation/arch/powerpc/kvm-nested.rst
> @@ -546,7 +546,9 @@ table information.
>  +--------+-------+----+--------+----------------------------------+
>  | 0x1052 | 0x08  | RW |   T    | CTRL                             |
>  +--------+-------+----+--------+----------------------------------+
> -| 0x1053-|       |    |        | Reserved                         |
> +| 0x1053 | 0x08  | RW |   T    | DPDES                            |
> ++--------+-------+----+--------+----------------------------------+
> +| 0x1054-|       |    |        | Reserved                         |
>  | 0x1FFF |       |    |        |                                  |
>  +--------+-------+----+--------+----------------------------------+
>  | 0x2000 | 0x04  | RW |   T    | CR                               |
> diff --git a/arch/powerpc/include/asm/guest-state-buffer.h b/arch/powerpc/include/asm/guest-state-buffer.h
> index 808149f31576..d107abe1468f 100644
> --- a/arch/powerpc/include/asm/guest-state-buffer.h
> +++ b/arch/powerpc/include/asm/guest-state-buffer.h
> @@ -81,6 +81,7 @@
>  #define KVMPPC_GSID_HASHKEYR			0x1050
>  #define KVMPPC_GSID_HASHPKEYR			0x1051
>  #define KVMPPC_GSID_CTRL			0x1052
> +#define KVMPPC_GSID_DPDES			0x1053
>  
>  #define KVMPPC_GSID_CR				0x2000
>  #define KVMPPC_GSID_PIDR			0x2001
> @@ -110,7 +111,7 @@
>  #define KVMPPC_GSE_META_COUNT (KVMPPC_GSE_META_END - KVMPPC_GSE_META_START + 1)
>  
>  #define KVMPPC_GSE_DW_REGS_START KVMPPC_GSID_GPR(0)
> -#define KVMPPC_GSE_DW_REGS_END KVMPPC_GSID_CTRL
> +#define KVMPPC_GSE_DW_REGS_END KVMPPC_GSID_DPDES
>  #define KVMPPC_GSE_DW_REGS_COUNT \
>  	(KVMPPC_GSE_DW_REGS_END - KVMPPC_GSE_DW_REGS_START + 1)
>  
> diff --git a/arch/powerpc/include/asm/kvm_book3s.h b/arch/powerpc/include/asm/kvm_book3s.h
> index 3e1e2a698c9e..10618622d7ef 100644
> --- a/arch/powerpc/include/asm/kvm_book3s.h
> +++ b/arch/powerpc/include/asm/kvm_book3s.h
> @@ -594,6 +594,7 @@ static inline u##size kvmppc_get_##reg(struct kvm_vcpu *vcpu)		\
>  
>  
>  KVMPPC_BOOK3S_VCORE_ACCESSOR(vtb, 64, KVMPPC_GSID_VTB)
> +KVMPPC_BOOK3S_VCORE_ACCESSOR(dpdes, 64, KVMPPC_GSID_DPDES)
>  KVMPPC_BOOK3S_VCORE_ACCESSOR_GET(arch_compat, 32, KVMPPC_GSID_LOGICAL_PVR)
>  KVMPPC_BOOK3S_VCORE_ACCESSOR_GET(lpcr, 64, KVMPPC_GSID_LPCR)
>  KVMPPC_BOOK3S_VCORE_ACCESSOR_SET(tb_offset, 64, KVMPPC_GSID_TB_OFFSET)
> diff --git a/arch/powerpc/kvm/book3s_hv_nestedv2.c b/arch/powerpc/kvm/book3s_hv_nestedv2.c
> index 8e6f5355f08b..36863fff2a99 100644
> --- a/arch/powerpc/kvm/book3s_hv_nestedv2.c
> +++ b/arch/powerpc/kvm/book3s_hv_nestedv2.c
> @@ -311,6 +311,10 @@ static int gs_msg_ops_vcpu_fill_info(struct kvmppc_gs_buff *gsb,
>  			rc = kvmppc_gse_put_u64(gsb, iden,
>  						vcpu->arch.vcore->vtb);
>  			break;
> +		case KVMPPC_GSID_DPDES:
> +			rc = kvmppc_gse_put_u64(gsb, iden,
> +						vcpu->arch.vcore->dpdes);
> +			break;
>  		case KVMPPC_GSID_LPCR:
>  			rc = kvmppc_gse_put_u64(gsb, iden,
>  						vcpu->arch.vcore->lpcr);
> @@ -543,6 +547,9 @@ static int gs_msg_ops_vcpu_refresh_info(struct kvmppc_gs_msg *gsm,
>  		case KVMPPC_GSID_VTB:
>  			vcpu->arch.vcore->vtb = kvmppc_gse_get_u64(gse);
>  			break;
> +		case KVMPPC_GSID_DPDES:
> +			vcpu->arch.vcore->dpdes = kvmppc_gse_get_u64(gse);
> +			break;
>  		case KVMPPC_GSID_LPCR:
>  			vcpu->arch.vcore->lpcr = kvmppc_gse_get_u64(gse);
>  			break;
> diff --git a/arch/powerpc/kvm/test-guest-state-buffer.c b/arch/powerpc/kvm/test-guest-state-buffer.c
> index 4720b8dc8837..2571ccc618c9 100644
> --- a/arch/powerpc/kvm/test-guest-state-buffer.c
> +++ b/arch/powerpc/kvm/test-guest-state-buffer.c
> @@ -151,7 +151,7 @@ static void test_gs_bitmap(struct kunit *test)
>  		i++;
>  	}
>  
> -	for (u16 iden = KVMPPC_GSID_GPR(0); iden <= KVMPPC_GSID_CTRL; iden++) {
> +	for (u16 iden = KVMPPC_GSID_GPR(0); iden <= KVMPPC_GSE_DW_REGS_END; iden++) {
>  		kvmppc_gsbm_set(&gsbm, iden);
>  		kvmppc_gsbm_set(&gsbm1, iden);
>  		KUNIT_EXPECT_TRUE(test, kvmppc_gsbm_test(&gsbm, iden));

Re: [PATCH v2 2/2] arch/powerpc/kvm: Fix doorbell emulation for v2 API

[Nicholas Piggin]

On Wed Jun 5, 2024 at 9:39 PM AEST, Gautam Menghani wrote:
> Doorbell emulation is broken for KVM on PAPR guests as support for
> DPDES was not added in the initial patch series. Due to this, a KVM on
> PAPR guest with SMT > 1 cannot be booted with the XICS interrupt
> controller as doorbells are setup in the initial probe path when using XICS
> (pSeries_smp_probe()).
>
> Command to replicate the above bug:
>
> qemu-system-ppc64 \
> 	-drive file=rhel.qcow2,format=qcow2 \
> 	-m 20G \
> 	-smp 8,cores=1,threads=8 \
> 	-cpu  host \
> 	-nographic \
> 	-machine pseries,ic-mode=xics -accel kvm
>
> Add doorbell state handling support in the host
> KVM code to fix doorbell emulation.

Reviewed-by: Nicholas Piggin <npiggin@gmail.com>

>
> Fixes: 19d31c5f1157 ("KVM: PPC: Add support for nestedv2 guests")
> Cc: stable@vger.kernel.org # v6.7
> Signed-off-by: Gautam Menghani <gautam@linux.ibm.com>
> ---
>  arch/powerpc/kvm/book3s_hv.c | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
> index 35cb014a0c51..21c69647d27c 100644
> --- a/arch/powerpc/kvm/book3s_hv.c
> +++ b/arch/powerpc/kvm/book3s_hv.c
> @@ -4116,6 +4116,11 @@ static int kvmhv_vcpu_entry_nestedv2(struct kvm_vcpu *vcpu, u64 time_limit,
>  	int trap;
>  	long rc;
>  
> +	if (vcpu->arch.doorbell_request) {
> +		vcpu->arch.doorbell_request = 0;
> +		kvmppc_set_dpdes(vcpu, 1);
> +	}
> +
>  	io = &vcpu->arch.nestedv2_io;
>  
>  	msr = mfmsr();

Re: [PATCH v2 0/2] Fix doorbell emulation for v2 API on PPC

[Nicholas Piggin]

On Wed Jun 5, 2024 at 9:39 PM AEST, Gautam Menghani wrote:
> Doorbell emulation for KVM on PAPR guests is broken as support for DPDES
> was not added in initial patch series [1].
> Add DPDES support and doorbell handling support for V2 API. 

Looks good, thanks. So fix for v1 doorbells is coming?

Thanks,
Nick

>
> [1] lore.kernel.org/linuxppc-dev/20230914030600.16993-1-jniethe5@gmail.com
>
> Changes in v2:
> 1. Split DPDES support into its own patch
>
> Gautam Menghani (2):
>   arch/powerpc/kvm: Add DPDES support in helper library for Guest state
>     buffer
>   arch/powerpc/kvm: Fix doorbell emulation for v2 API
>
>  Documentation/arch/powerpc/kvm-nested.rst     | 4 +++-
>  arch/powerpc/include/asm/guest-state-buffer.h | 3 ++-
>  arch/powerpc/include/asm/kvm_book3s.h         | 1 +
>  arch/powerpc/kvm/book3s_hv.c                  | 5 +++++
>  arch/powerpc/kvm/book3s_hv_nestedv2.c         | 7 +++++++
>  arch/powerpc/kvm/test-guest-state-buffer.c    | 2 +-
>  6 files changed, 19 insertions(+), 3 deletions(-)

Re: [PATCH v2 0/2] Fix doorbell emulation for v2 API on PPC

[Gautam Menghani]

On Thu, Jun 06, 2024 at 01:00:19PM GMT, Nicholas Piggin wrote:
> On Wed Jun 5, 2024 at 9:39 PM AEST, Gautam Menghani wrote:
> > Doorbell emulation for KVM on PAPR guests is broken as support for DPDES
> > was not added in initial patch series [1].
> > Add DPDES support and doorbell handling support for V2 API. 
> 
> Looks good, thanks. So fix for v1 doorbells is coming?

Yes I've root caused the doorbell breakage in V1 API to 
commit 7c3ded5735141ff4d049747c9f76672a8b737c49. I'll send out a fix
soon.

Thanks,
Gautam

Re: [PATCH v2 0/2] Fix doorbell emulation for v2 API on PPC

[Gautam Menghani]

On Wed, Jun 05, 2024 at 05:09:08PM GMT, Gautam Menghani wrote:
> Doorbell emulation for KVM on PAPR guests is broken as support for DPDES
> was not added in initial patch series [1].
> Add DPDES support and doorbell handling support for V2 API. 
> 
> [1] lore.kernel.org/linuxppc-dev/20230914030600.16993-1-jniethe5@gmail.com
> 
> Changes in v2:
> 1. Split DPDES support into its own patch
> 
> Gautam Menghani (2):
>   arch/powerpc/kvm: Add DPDES support in helper library for Guest state
>     buffer
>   arch/powerpc/kvm: Fix doorbell emulation for v2 API
> 
>  Documentation/arch/powerpc/kvm-nested.rst     | 4 +++-
>  arch/powerpc/include/asm/guest-state-buffer.h | 3 ++-
>  arch/powerpc/include/asm/kvm_book3s.h         | 1 +
>  arch/powerpc/kvm/book3s_hv.c                  | 5 +++++
>  arch/powerpc/kvm/book3s_hv_nestedv2.c         | 7 +++++++
>  arch/powerpc/kvm/test-guest-state-buffer.c    | 2 +-
>  6 files changed, 19 insertions(+), 3 deletions(-)
> 
> -- 
> 2.45.1
> 


Hi Michael,

This patch series is to be backported for all kernels >= 6.7. So the tag
should be 
Cc: stable@vger.kernel.org # v6.7+

and not
Cc: stable@vger.kernel.org # v6.7

Should I send a new version of this series or can you please make this 
change when pulling in your tree?

Thanks,
Gautam

Re: [PATCH v2 0/2] Fix doorbell emulation for v2 API on PPC

[Michael Ellerman]

Gautam Menghani <gautam@linux.ibm.com> writes:
> On Wed, Jun 05, 2024 at 05:09:08PM GMT, Gautam Menghani wrote:
>> Doorbell emulation for KVM on PAPR guests is broken as support for DPDES
>> was not added in initial patch series [1].
>> Add DPDES support and doorbell handling support for V2 API. 
>> 
>> [1] lore.kernel.org/linuxppc-dev/20230914030600.16993-1-jniethe5@gmail.com
>> 
>> Changes in v2:
>> 1. Split DPDES support into its own patch
>> 
>> Gautam Menghani (2):
>>   arch/powerpc/kvm: Add DPDES support in helper library for Guest state
>>     buffer
>>   arch/powerpc/kvm: Fix doorbell emulation for v2 API
>> 
>>  Documentation/arch/powerpc/kvm-nested.rst     | 4 +++-
>>  arch/powerpc/include/asm/guest-state-buffer.h | 3 ++-
>>  arch/powerpc/include/asm/kvm_book3s.h         | 1 +
>>  arch/powerpc/kvm/book3s_hv.c                  | 5 +++++
>>  arch/powerpc/kvm/book3s_hv_nestedv2.c         | 7 +++++++
>>  arch/powerpc/kvm/test-guest-state-buffer.c    | 2 +-
>>  6 files changed, 19 insertions(+), 3 deletions(-)
>> 
>> -- 
>> 2.45.1
>> 
>
>
> Hi Michael,
>
> This patch series is to be backported for all kernels >= 6.7. So the tag
> should be 
> Cc: stable@vger.kernel.org # v6.7+
>
> and not
> Cc: stable@vger.kernel.org # v6.7
>
> Should I send a new version of this series or can you please make this 
> change when pulling in your tree?

I can make the change when applying.

cheers

Re: [PATCH v2 0/2] Fix doorbell emulation for v2 API on PPC

[Michael Ellerman]

On Wed, 05 Jun 2024 17:09:08 +0530, Gautam Menghani wrote:
> Doorbell emulation for KVM on PAPR guests is broken as support for DPDES
> was not added in initial patch series [1].
> Add DPDES support and doorbell handling support for V2 API.
> 
> [1] lore.kernel.org/linuxppc-dev/20230914030600.16993-1-jniethe5@gmail.com
> 
> Changes in v2:
> 1. Split DPDES support into its own patch
> 
> [...]

Applied to powerpc/topic/ppc-kvm.

[1/2] arch/powerpc/kvm: Add DPDES support in helper library for Guest state buffer
      https://git.kernel.org/powerpc/c/55dfb8bed6fe8bda390cc71cca878d11a9407099
[2/2] arch/powerpc/kvm: Fix doorbell emulation for v2 API
      https://git.kernel.org/powerpc/c/54ec2bd9e0173b75daf84675d07c56584f96564b

cheers