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[PATCH RFC] target: riscv: Add Svvptc extension support

Alexandre Ghiti posted 1 patch 1 year, 12 months ago
Patches applied successfully (tree, apply log)
git fetch https://github.com/patchew-project/qemu tags/patchew/20240213145308.869874-1-alexghiti@rivosinc.com
Maintainers: Palmer Dabbelt <palmer@dabbelt.com>, Alistair Francis <alistair.francis@wdc.com>, Bin Meng <bin.meng@windriver.com>, Weiwei Li <liwei1518@gmail.com>, Daniel Henrique Barboza <dbarboza@ventanamicro.com>, Liu Zhiwei <zhiwei_liu@linux.alibaba.com>
There is a newer version of this series
target/riscv/cpu.c     | 2 ++
target/riscv/cpu_cfg.h | 1 +
2 files changed, 3 insertions(+)
[PATCH RFC] target: riscv: Add Svvptc extension support
Posted by Alexandre Ghiti 1 year, 12 months ago 
The Svvptc extension describes a uarch that does not cache invalid TLB
entries: that's the case for qemu so there is nothing particular to
implement other than the introduction of this extension, which is done
here.

Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
---

That's an RFC since the extension has not been ratified yet.

 target/riscv/cpu.c     | 2 ++
 target/riscv/cpu_cfg.h | 1 +
 2 files changed, 3 insertions(+)

diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index 1b8d001d23..4beb5d0350 100644
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -178,6 +178,7 @@ const RISCVIsaExtData isa_edata_arr[] = {
     ISA_EXT_DATA_ENTRY(svinval, PRIV_VERSION_1_12_0, ext_svinval),
     ISA_EXT_DATA_ENTRY(svnapot, PRIV_VERSION_1_12_0, ext_svnapot),
     ISA_EXT_DATA_ENTRY(svpbmt, PRIV_VERSION_1_12_0, ext_svpbmt),
+    ISA_EXT_DATA_ENTRY(svvptc, PRIV_VERSION_1_12_0, ext_svvptc),
     ISA_EXT_DATA_ENTRY(xtheadba, PRIV_VERSION_1_11_0, ext_xtheadba),
     ISA_EXT_DATA_ENTRY(xtheadbb, PRIV_VERSION_1_11_0, ext_xtheadbb),
     ISA_EXT_DATA_ENTRY(xtheadbs, PRIV_VERSION_1_11_0, ext_xtheadbs),
@@ -1467,6 +1468,7 @@ const RISCVCPUMultiExtConfig riscv_cpu_extensions[] = {
     MULTI_EXT_CFG_BOOL("svinval", ext_svinval, false),
     MULTI_EXT_CFG_BOOL("svnapot", ext_svnapot, false),
     MULTI_EXT_CFG_BOOL("svpbmt", ext_svpbmt, false),
+    MULTI_EXT_CFG_BOOL("svvptc", ext_svvptc, false),
 
     MULTI_EXT_CFG_BOOL("zicntr", ext_zicntr, true),
     MULTI_EXT_CFG_BOOL("zihpm", ext_zihpm, true),
diff --git a/target/riscv/cpu_cfg.h b/target/riscv/cpu_cfg.h
index 833bf58217..c973693b6e 100644
--- a/target/riscv/cpu_cfg.h
+++ b/target/riscv/cpu_cfg.h
@@ -77,6 +77,7 @@ struct RISCVCPUConfig {
     bool ext_svinval;
     bool ext_svnapot;
     bool ext_svpbmt;
+    bool ext_svvptc;
     bool ext_zdinx;
     bool ext_zaamo;
     bool ext_zacas;
-- 
2.39.2
Re: [PATCH RFC] target: riscv: Add Svvptc extension support
Posted by Andrew Jones 1 year, 12 months ago 
On Tue, Feb 13, 2024 at 03:53:08PM +0100, Alexandre Ghiti wrote:
> The Svvptc extension describes a uarch that does not cache invalid TLB
> entries: that's the case for qemu so there is nothing particular to
> implement other than the introduction of this extension, which is done
> here.
> 
> Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
> ---
> 
> That's an RFC since the extension has not been ratified yet.

Hi Alex,

No need for the RFC tag. You can add not-yet-ratified extension support
to QEMU as long as the CPU property is off by default (as you've done)
and you add it to the riscv_cpu_experimental_exts[] array with an "x-"
prefix on its property name.

Thanks,
drew

> 
>  target/riscv/cpu.c     | 2 ++
>  target/riscv/cpu_cfg.h | 1 +
>  2 files changed, 3 insertions(+)
> 
> diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
> index 1b8d001d23..4beb5d0350 100644
> --- a/target/riscv/cpu.c
> +++ b/target/riscv/cpu.c
> @@ -178,6 +178,7 @@ const RISCVIsaExtData isa_edata_arr[] = {
>      ISA_EXT_DATA_ENTRY(svinval, PRIV_VERSION_1_12_0, ext_svinval),
>      ISA_EXT_DATA_ENTRY(svnapot, PRIV_VERSION_1_12_0, ext_svnapot),
>      ISA_EXT_DATA_ENTRY(svpbmt, PRIV_VERSION_1_12_0, ext_svpbmt),
> +    ISA_EXT_DATA_ENTRY(svvptc, PRIV_VERSION_1_12_0, ext_svvptc),
>      ISA_EXT_DATA_ENTRY(xtheadba, PRIV_VERSION_1_11_0, ext_xtheadba),
>      ISA_EXT_DATA_ENTRY(xtheadbb, PRIV_VERSION_1_11_0, ext_xtheadbb),
>      ISA_EXT_DATA_ENTRY(xtheadbs, PRIV_VERSION_1_11_0, ext_xtheadbs),
> @@ -1467,6 +1468,7 @@ const RISCVCPUMultiExtConfig riscv_cpu_extensions[] = {
>      MULTI_EXT_CFG_BOOL("svinval", ext_svinval, false),
>      MULTI_EXT_CFG_BOOL("svnapot", ext_svnapot, false),
>      MULTI_EXT_CFG_BOOL("svpbmt", ext_svpbmt, false),
> +    MULTI_EXT_CFG_BOOL("svvptc", ext_svvptc, false),
>  
>      MULTI_EXT_CFG_BOOL("zicntr", ext_zicntr, true),
>      MULTI_EXT_CFG_BOOL("zihpm", ext_zihpm, true),
> diff --git a/target/riscv/cpu_cfg.h b/target/riscv/cpu_cfg.h
> index 833bf58217..c973693b6e 100644
> --- a/target/riscv/cpu_cfg.h
> +++ b/target/riscv/cpu_cfg.h
> @@ -77,6 +77,7 @@ struct RISCVCPUConfig {
>      bool ext_svinval;
>      bool ext_svnapot;
>      bool ext_svpbmt;
> +    bool ext_svvptc;
>      bool ext_zdinx;
>      bool ext_zaamo;
>      bool ext_zacas;
> -- 
> 2.39.2
> 
>
Re: [PATCH RFC] target: riscv: Add Svvptc extension support
Posted by Alexandre Ghiti 1 year, 11 months ago 
Hi Andrew,

Sorry for the very late reply, I was (and still am) off!

On Tue, Feb 13, 2024 at 4:33 PM Andrew Jones <ajones@ventanamicro.com> wrote:
>
> On Tue, Feb 13, 2024 at 03:53:08PM +0100, Alexandre Ghiti wrote:
> > The Svvptc extension describes a uarch that does not cache invalid TLB
> > entries: that's the case for qemu so there is nothing particular to
> > implement other than the introduction of this extension, which is done
> > here.
> >
> > Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
> > ---
> >
> > That's an RFC since the extension has not been ratified yet.
>
> Hi Alex,
>
> No need for the RFC tag. You can add not-yet-ratified extension support
> to QEMU as long as the CPU property is off by default (as you've done)
> and you add it to the riscv_cpu_experimental_exts[] array with an "x-"
> prefix on its property name.
>

I'll do that next week then,

Thanks,

Alex

> Thanks,
> drew
>
> >
> >  target/riscv/cpu.c     | 2 ++
> >  target/riscv/cpu_cfg.h | 1 +
> >  2 files changed, 3 insertions(+)
> >
> > diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
> > index 1b8d001d23..4beb5d0350 100644
> > --- a/target/riscv/cpu.c
> > +++ b/target/riscv/cpu.c
> > @@ -178,6 +178,7 @@ const RISCVIsaExtData isa_edata_arr[] = {
> >      ISA_EXT_DATA_ENTRY(svinval, PRIV_VERSION_1_12_0, ext_svinval),
> >      ISA_EXT_DATA_ENTRY(svnapot, PRIV_VERSION_1_12_0, ext_svnapot),
> >      ISA_EXT_DATA_ENTRY(svpbmt, PRIV_VERSION_1_12_0, ext_svpbmt),
> > +    ISA_EXT_DATA_ENTRY(svvptc, PRIV_VERSION_1_12_0, ext_svvptc),
> >      ISA_EXT_DATA_ENTRY(xtheadba, PRIV_VERSION_1_11_0, ext_xtheadba),
> >      ISA_EXT_DATA_ENTRY(xtheadbb, PRIV_VERSION_1_11_0, ext_xtheadbb),
> >      ISA_EXT_DATA_ENTRY(xtheadbs, PRIV_VERSION_1_11_0, ext_xtheadbs),
> > @@ -1467,6 +1468,7 @@ const RISCVCPUMultiExtConfig riscv_cpu_extensions[] = {
> >      MULTI_EXT_CFG_BOOL("svinval", ext_svinval, false),
> >      MULTI_EXT_CFG_BOOL("svnapot", ext_svnapot, false),
> >      MULTI_EXT_CFG_BOOL("svpbmt", ext_svpbmt, false),
> > +    MULTI_EXT_CFG_BOOL("svvptc", ext_svvptc, false),
> >
> >      MULTI_EXT_CFG_BOOL("zicntr", ext_zicntr, true),
> >      MULTI_EXT_CFG_BOOL("zihpm", ext_zihpm, true),
> > diff --git a/target/riscv/cpu_cfg.h b/target/riscv/cpu_cfg.h
> > index 833bf58217..c973693b6e 100644
> > --- a/target/riscv/cpu_cfg.h
> > +++ b/target/riscv/cpu_cfg.h
> > @@ -77,6 +77,7 @@ struct RISCVCPUConfig {
> >      bool ext_svinval;
> >      bool ext_svnapot;
> >      bool ext_svpbmt;
> > +    bool ext_svvptc;
> >      bool ext_zdinx;
> >      bool ext_zaamo;
> >      bool ext_zacas;
> > --
> > 2.39.2
> >
> >

Patchew 2.1-devel-b67e4c2

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