target/riscv/kvm/kvm-cpu.c | 5 +++-- target/riscv/sbi_ecall_interface.h | 11 +++++++++++ 2 files changed, 14 insertions(+), 2 deletions(-)
kvm_riscv_handle_sbi() may return not supported return code to not trigger
qemu abort with vendor-specific sbi.
Added SBI related return code's defines.
Signed-off-by: Alexei Filippov <alexei.filippov@syntacore.com>
---
target/riscv/kvm/kvm-cpu.c | 5 +++--
target/riscv/sbi_ecall_interface.h | 11 +++++++++++
2 files changed, 14 insertions(+), 2 deletions(-)
diff --git a/target/riscv/kvm/kvm-cpu.c b/target/riscv/kvm/kvm-cpu.c
index 6a6c6cae80..a4f84ad950 100644
--- a/target/riscv/kvm/kvm-cpu.c
+++ b/target/riscv/kvm/kvm-cpu.c
@@ -1404,7 +1404,7 @@ static int kvm_riscv_handle_sbi(CPUState *cs, struct kvm_run *run)
if (ret == sizeof(ch)) {
run->riscv_sbi.ret[0] = ch;
} else {
- run->riscv_sbi.ret[0] = -1;
+ run->riscv_sbi.ret[0] = SBI_ERR_FAILURE;
}
ret = 0;
break;
@@ -1412,7 +1412,8 @@ static int kvm_riscv_handle_sbi(CPUState *cs, struct kvm_run *run)
qemu_log_mask(LOG_UNIMP,
"%s: un-handled SBI EXIT, specific reasons is %lu\n",
__func__, run->riscv_sbi.extension_id);
- ret = -1;
+ run->riscv_sbi.ret[0] = SBI_ERR_NOT_SUPPORTED;
+ ret = 0;
break;
}
return ret;
diff --git a/target/riscv/sbi_ecall_interface.h b/target/riscv/sbi_ecall_interface.h
index 43899d08f6..0279e92a36 100644
--- a/target/riscv/sbi_ecall_interface.h
+++ b/target/riscv/sbi_ecall_interface.h
@@ -69,4 +69,15 @@
#define SBI_EXT_VENDOR_END 0x09FFFFFF
/* clang-format on */
+/* SBI return error codes */
+#define SBI_SUCCESS 0
+#define SBI_ERR_FAILURE -1
+#define SBI_ERR_NOT_SUPPORTED -2
+#define SBI_ERR_INVALID_PARAM -3
+#define SBI_ERR_DENIED -4
+#define SBI_ERR_INVALID_ADDRESS -5
+#define SBI_ERR_ALREADY_AVAILABLE -6
+#define SBI_ERR_ALREADY_STARTED -7
+#define SBI_ERR_ALREADY_STOPPED -8
+
#endif
--
2.34.1CCing Anup as well
On 3/25/24 07:14, Alexei Filippov wrote:
> kvm_riscv_handle_sbi() may return not supported return code to not trigger
> qemu abort with vendor-specific sbi.
>
> Added SBI related return code's defines.
Please add:
Fixes: 4eb47125 ("target/riscv: Handle KVM_EXIT_RISCV_SBI exit")
>
> Signed-off-by: Alexei Filippov <alexei.filippov@syntacore.com>
> ---
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
> target/riscv/kvm/kvm-cpu.c | 5 +++--
> target/riscv/sbi_ecall_interface.h | 11 +++++++++++
> 2 files changed, 14 insertions(+), 2 deletions(-)
>
> diff --git a/target/riscv/kvm/kvm-cpu.c b/target/riscv/kvm/kvm-cpu.c
> index 6a6c6cae80..a4f84ad950 100644
> --- a/target/riscv/kvm/kvm-cpu.c
> +++ b/target/riscv/kvm/kvm-cpu.c
> @@ -1404,7 +1404,7 @@ static int kvm_riscv_handle_sbi(CPUState *cs, struct kvm_run *run)
> if (ret == sizeof(ch)) {
> run->riscv_sbi.ret[0] = ch;
> } else {
> - run->riscv_sbi.ret[0] = -1;
> + run->riscv_sbi.ret[0] = SBI_ERR_FAILURE;
> }
> ret = 0;
> break;
> @@ -1412,7 +1412,8 @@ static int kvm_riscv_handle_sbi(CPUState *cs, struct kvm_run *run)
> qemu_log_mask(LOG_UNIMP,
> "%s: un-handled SBI EXIT, specific reasons is %lu\n",
> __func__, run->riscv_sbi.extension_id);
> - ret = -1;
> + run->riscv_sbi.ret[0] = SBI_ERR_NOT_SUPPORTED;
> + ret = 0;
> break;
> }
> return ret;
> diff --git a/target/riscv/sbi_ecall_interface.h b/target/riscv/sbi_ecall_interface.h
> index 43899d08f6..0279e92a36 100644
> --- a/target/riscv/sbi_ecall_interface.h
> +++ b/target/riscv/sbi_ecall_interface.h
> @@ -69,4 +69,15 @@
> #define SBI_EXT_VENDOR_END 0x09FFFFFF
> /* clang-format on */
>
> +/* SBI return error codes */
> +#define SBI_SUCCESS 0
> +#define SBI_ERR_FAILURE -1
> +#define SBI_ERR_NOT_SUPPORTED -2
> +#define SBI_ERR_INVALID_PARAM -3
> +#define SBI_ERR_DENIED -4
> +#define SBI_ERR_INVALID_ADDRESS -5
> +#define SBI_ERR_ALREADY_AVAILABLE -6
> +#define SBI_ERR_ALREADY_STARTED -7
> +#define SBI_ERR_ALREADY_STOPPED -8
> +
> #endif
kvm_riscv_handle_sbi() may return not supported return code to not trigger
qemu abort with vendor-specific sbi.
Added SBI related return code's defines.
Signed-off-by: Alexei Filippov <alexei.filippov@syntacore.com>
Fixes: 4eb47125 ("target/riscv: Handle KVM_EXIT_RISCV_SBI exit")
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
---
Changes since v1:
-Add Fixes and Revied-by lines.
target/riscv/kvm/kvm-cpu.c | 5 +++--
target/riscv/sbi_ecall_interface.h | 11 +++++++++++
2 files changed, 14 insertions(+), 2 deletions(-)
diff --git a/target/riscv/kvm/kvm-cpu.c b/target/riscv/kvm/kvm-cpu.c
index 6a6c6cae80..a4f84ad950 100644
--- a/target/riscv/kvm/kvm-cpu.c
+++ b/target/riscv/kvm/kvm-cpu.c
@@ -1404,7 +1404,7 @@ static int kvm_riscv_handle_sbi(CPUState *cs, struct kvm_run *run)
if (ret == sizeof(ch)) {
run->riscv_sbi.ret[0] = ch;
} else {
- run->riscv_sbi.ret[0] = -1;
+ run->riscv_sbi.ret[0] = SBI_ERR_FAILURE;
}
ret = 0;
break;
@@ -1412,7 +1412,8 @@ static int kvm_riscv_handle_sbi(CPUState *cs, struct kvm_run *run)
qemu_log_mask(LOG_UNIMP,
"%s: un-handled SBI EXIT, specific reasons is %lu\n",
__func__, run->riscv_sbi.extension_id);
- ret = -1;
+ run->riscv_sbi.ret[0] = SBI_ERR_NOT_SUPPORTED;
+ ret = 0;
break;
}
return ret;
diff --git a/target/riscv/sbi_ecall_interface.h b/target/riscv/sbi_ecall_interface.h
index 43899d08f6..0279e92a36 100644
--- a/target/riscv/sbi_ecall_interface.h
+++ b/target/riscv/sbi_ecall_interface.h
@@ -69,4 +69,15 @@
#define SBI_EXT_VENDOR_END 0x09FFFFFF
/* clang-format on */
+/* SBI return error codes */
+#define SBI_SUCCESS 0
+#define SBI_ERR_FAILURE -1
+#define SBI_ERR_NOT_SUPPORTED -2
+#define SBI_ERR_INVALID_PARAM -3
+#define SBI_ERR_DENIED -4
+#define SBI_ERR_INVALID_ADDRESS -5
+#define SBI_ERR_ALREADY_AVAILABLE -6
+#define SBI_ERR_ALREADY_STARTED -7
+#define SBI_ERR_ALREADY_STOPPED -8
+
#endif
--
2.34.1On Mon, Mar 25, 2024 at 04:01:16PM +0300, Alexei Filippov wrote:
> kvm_riscv_handle_sbi() may return not supported return code to not trigger
> qemu abort with vendor-specific sbi.
>
> Added SBI related return code's defines.
>
> Signed-off-by: Alexei Filippov <alexei.filippov@syntacore.com>
> Fixes: 4eb47125 ("target/riscv: Handle KVM_EXIT_RISCV_SBI exit")
> Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
> ---
>
> Changes since v1:
> -Add Fixes and Revied-by lines.
> target/riscv/kvm/kvm-cpu.c | 5 +++--
> target/riscv/sbi_ecall_interface.h | 11 +++++++++++
> 2 files changed, 14 insertions(+), 2 deletions(-)
>
> diff --git a/target/riscv/kvm/kvm-cpu.c b/target/riscv/kvm/kvm-cpu.c
> index 6a6c6cae80..a4f84ad950 100644
> --- a/target/riscv/kvm/kvm-cpu.c
> +++ b/target/riscv/kvm/kvm-cpu.c
> @@ -1404,7 +1404,7 @@ static int kvm_riscv_handle_sbi(CPUState *cs, struct kvm_run *run)
> if (ret == sizeof(ch)) {
> run->riscv_sbi.ret[0] = ch;
> } else {
> - run->riscv_sbi.ret[0] = -1;
> + run->riscv_sbi.ret[0] = SBI_ERR_FAILURE;
> }
> ret = 0;
> break;
> @@ -1412,7 +1412,8 @@ static int kvm_riscv_handle_sbi(CPUState *cs, struct kvm_run *run)
> qemu_log_mask(LOG_UNIMP,
> "%s: un-handled SBI EXIT, specific reasons is %lu\n",
> __func__, run->riscv_sbi.extension_id);
While changing this, can we also change this log to something like
"%s: Unhandled SBI exit with extension-id %lu\n", __func__, run->riscv_sbi.extension_id
> - ret = -1;
> + run->riscv_sbi.ret[0] = SBI_ERR_NOT_SUPPORTED;
> + ret = 0;
We don't have any paths that set ret to anything other than zero now.
Let's return zero at the bottom of the function instead. And the top
of the function can then be cleaned up to
unsigned char ch;
int ret;
switch (run->riscv_sbi.extension_id) {
> break;
> }
> return ret;
> diff --git a/target/riscv/sbi_ecall_interface.h b/target/riscv/sbi_ecall_interface.h
> index 43899d08f6..0279e92a36 100644
> --- a/target/riscv/sbi_ecall_interface.h
> +++ b/target/riscv/sbi_ecall_interface.h
> @@ -69,4 +69,15 @@
> #define SBI_EXT_VENDOR_END 0x09FFFFFF
> /* clang-format on */
>
> +/* SBI return error codes */
> +#define SBI_SUCCESS 0
> +#define SBI_ERR_FAILURE -1
> +#define SBI_ERR_NOT_SUPPORTED -2
> +#define SBI_ERR_INVALID_PARAM -3
> +#define SBI_ERR_DENIED -4
> +#define SBI_ERR_INVALID_ADDRESS -5
> +#define SBI_ERR_ALREADY_AVAILABLE -6
> +#define SBI_ERR_ALREADY_STARTED -7
> +#define SBI_ERR_ALREADY_STOPPED -8
v2 of the spec has SBI_ERR_NO_SHMEM as well.
Thanks,
drew
> +
> #endif
> --
> 2.34.1
>
>
kvm_riscv_handle_sbi() may return not supported return code to not trigger
qemu abort with vendor-specific sbi.
Added SBI related return code's defines.
Signed-off-by: Alexei Filippov <alexei.filippov@syntacore.com>
Fixes: 4eb47125 ("target/riscv: Handle KVM_EXIT_RISCV_SBI exit")
---
Changes since v3:
-Clear Reviewed-by tags
target/riscv/kvm/kvm-cpu.c | 13 +++++--------
target/riscv/sbi_ecall_interface.h | 12 ++++++++++++
2 files changed, 17 insertions(+), 8 deletions(-)
diff --git a/target/riscv/kvm/kvm-cpu.c b/target/riscv/kvm/kvm-cpu.c
index 6a6c6cae80..844942d9ba 100644
--- a/target/riscv/kvm/kvm-cpu.c
+++ b/target/riscv/kvm/kvm-cpu.c
@@ -1392,7 +1392,6 @@ bool kvm_arch_stop_on_emulation_error(CPUState *cs)
static int kvm_riscv_handle_sbi(CPUState *cs, struct kvm_run *run)
{
- int ret = 0;
unsigned char ch;
switch (run->riscv_sbi.extension_id) {
case SBI_EXT_0_1_CONSOLE_PUTCHAR:
@@ -1400,22 +1399,20 @@ static int kvm_riscv_handle_sbi(CPUState *cs, struct kvm_run *run)
qemu_chr_fe_write(serial_hd(0)->be, &ch, sizeof(ch));
break;
case SBI_EXT_0_1_CONSOLE_GETCHAR:
- ret = qemu_chr_fe_read_all(serial_hd(0)->be, &ch, sizeof(ch));
- if (ret == sizeof(ch)) {
+ if (qemu_chr_fe_read_all(serial_hd(0)->be, &ch, sizeof(ch)) == sizeof(ch)) {
run->riscv_sbi.ret[0] = ch;
} else {
- run->riscv_sbi.ret[0] = -1;
+ run->riscv_sbi.ret[0] = SBI_ERR_FAILURE;
}
- ret = 0;
break;
default:
qemu_log_mask(LOG_UNIMP,
- "%s: un-handled SBI EXIT, specific reasons is %lu\n",
+ "%s: Unhandled SBI exit with extension-id %lu\n",
__func__, run->riscv_sbi.extension_id);
- ret = -1;
+ run->riscv_sbi.ret[0] = SBI_ERR_NOT_SUPPORTED;
break;
}
- return ret;
+ return 0;
}
int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
diff --git a/target/riscv/sbi_ecall_interface.h b/target/riscv/sbi_ecall_interface.h
index 43899d08f6..a2e21d9b8c 100644
--- a/target/riscv/sbi_ecall_interface.h
+++ b/target/riscv/sbi_ecall_interface.h
@@ -69,4 +69,16 @@
#define SBI_EXT_VENDOR_END 0x09FFFFFF
/* clang-format on */
+/* SBI return error codes */
+#define SBI_SUCCESS 0
+#define SBI_ERR_FAILURE -1
+#define SBI_ERR_NOT_SUPPORTED -2
+#define SBI_ERR_INVALID_PARAM -3
+#define SBI_ERR_DENIED -4
+#define SBI_ERR_INVALID_ADDRESS -5
+#define SBI_ERR_ALREADY_AVAILABLE -6
+#define SBI_ERR_ALREADY_STARTED -7
+#define SBI_ERR_ALREADY_STOPPED -8
+#define SBI_ERR_NO_SHMEM -9
+
#endif
--
2.34.1On Sat, Apr 13, 2024 at 9:26 PM Alexei Filippov
<alexei.filippov@syntacore.com> wrote:
>
> kvm_riscv_handle_sbi() may return not supported return code to not trigger
> qemu abort with vendor-specific sbi.
>
> Added SBI related return code's defines.
>
> Signed-off-by: Alexei Filippov <alexei.filippov@syntacore.com>
> Fixes: 4eb47125 ("target/riscv: Handle KVM_EXIT_RISCV_SBI exit")
> ---
>
> Changes since v3:
> -Clear Reviewed-by tags
> target/riscv/kvm/kvm-cpu.c | 13 +++++--------
> target/riscv/sbi_ecall_interface.h | 12 ++++++++++++
> 2 files changed, 17 insertions(+), 8 deletions(-)
>
> diff --git a/target/riscv/kvm/kvm-cpu.c b/target/riscv/kvm/kvm-cpu.c
> index 6a6c6cae80..844942d9ba 100644
> --- a/target/riscv/kvm/kvm-cpu.c
> +++ b/target/riscv/kvm/kvm-cpu.c
> @@ -1392,7 +1392,6 @@ bool kvm_arch_stop_on_emulation_error(CPUState *cs)
>
> static int kvm_riscv_handle_sbi(CPUState *cs, struct kvm_run *run)
> {
> - int ret = 0;
> unsigned char ch;
> switch (run->riscv_sbi.extension_id) {
> case SBI_EXT_0_1_CONSOLE_PUTCHAR:
> @@ -1400,22 +1399,20 @@ static int kvm_riscv_handle_sbi(CPUState *cs, struct kvm_run *run)
> qemu_chr_fe_write(serial_hd(0)->be, &ch, sizeof(ch));
> break;
> case SBI_EXT_0_1_CONSOLE_GETCHAR:
> - ret = qemu_chr_fe_read_all(serial_hd(0)->be, &ch, sizeof(ch));
> - if (ret == sizeof(ch)) {
> + if (qemu_chr_fe_read_all(serial_hd(0)->be, &ch, sizeof(ch)) == sizeof(ch)) {
> run->riscv_sbi.ret[0] = ch;
> } else {
> - run->riscv_sbi.ret[0] = -1;
> + run->riscv_sbi.ret[0] = SBI_ERR_FAILURE;
I'm not sure I follow. This seems like a failure but we report success
to the caller of this function?
Can you expand the commit message to explain why we want this change
Alistair
> }
> - ret = 0;
> break;
> default:
> qemu_log_mask(LOG_UNIMP,
> - "%s: un-handled SBI EXIT, specific reasons is %lu\n",
> + "%s: Unhandled SBI exit with extension-id %lu\n",
> __func__, run->riscv_sbi.extension_id);
> - ret = -1;
> + run->riscv_sbi.ret[0] = SBI_ERR_NOT_SUPPORTED;
> break;
> }
> - return ret;
> + return 0;
> }
>
> int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
> diff --git a/target/riscv/sbi_ecall_interface.h b/target/riscv/sbi_ecall_interface.h
> index 43899d08f6..a2e21d9b8c 100644
> --- a/target/riscv/sbi_ecall_interface.h
> +++ b/target/riscv/sbi_ecall_interface.h
> @@ -69,4 +69,16 @@
> #define SBI_EXT_VENDOR_END 0x09FFFFFF
> /* clang-format on */
>
> +/* SBI return error codes */
> +#define SBI_SUCCESS 0
> +#define SBI_ERR_FAILURE -1
> +#define SBI_ERR_NOT_SUPPORTED -2
> +#define SBI_ERR_INVALID_PARAM -3
> +#define SBI_ERR_DENIED -4
> +#define SBI_ERR_INVALID_ADDRESS -5
> +#define SBI_ERR_ALREADY_AVAILABLE -6
> +#define SBI_ERR_ALREADY_STARTED -7
> +#define SBI_ERR_ALREADY_STOPPED -8
> +#define SBI_ERR_NO_SHMEM -9
> +
> #endif
> --
> 2.34.1
>
>
On Mon, Apr 22, 2024 at 01:55:31PM +1000, Alistair Francis wrote:
> On Sat, Apr 13, 2024 at 9:26 PM Alexei Filippov
> <alexei.filippov@syntacore.com> wrote:
> >
> > kvm_riscv_handle_sbi() may return not supported return code to not trigger
> > qemu abort with vendor-specific sbi.
> >
> > Added SBI related return code's defines.
> >
> > Signed-off-by: Alexei Filippov <alexei.filippov@syntacore.com>
> > Fixes: 4eb47125 ("target/riscv: Handle KVM_EXIT_RISCV_SBI exit")
> > ---
> >
> > Changes since v3:
> > -Clear Reviewed-by tags
> > target/riscv/kvm/kvm-cpu.c | 13 +++++--------
> > target/riscv/sbi_ecall_interface.h | 12 ++++++++++++
> > 2 files changed, 17 insertions(+), 8 deletions(-)
> >
> > diff --git a/target/riscv/kvm/kvm-cpu.c b/target/riscv/kvm/kvm-cpu.c
> > index 6a6c6cae80..844942d9ba 100644
> > --- a/target/riscv/kvm/kvm-cpu.c
> > +++ b/target/riscv/kvm/kvm-cpu.c
> > @@ -1392,7 +1392,6 @@ bool kvm_arch_stop_on_emulation_error(CPUState *cs)
> >
> > static int kvm_riscv_handle_sbi(CPUState *cs, struct kvm_run *run)
> > {
> > - int ret = 0;
> > unsigned char ch;
> > switch (run->riscv_sbi.extension_id) {
> > case SBI_EXT_0_1_CONSOLE_PUTCHAR:
> > @@ -1400,22 +1399,20 @@ static int kvm_riscv_handle_sbi(CPUState *cs, struct kvm_run *run)
> > qemu_chr_fe_write(serial_hd(0)->be, &ch, sizeof(ch));
> > break;
> > case SBI_EXT_0_1_CONSOLE_GETCHAR:
> > - ret = qemu_chr_fe_read_all(serial_hd(0)->be, &ch, sizeof(ch));
> > - if (ret == sizeof(ch)) {
> > + if (qemu_chr_fe_read_all(serial_hd(0)->be, &ch, sizeof(ch)) == sizeof(ch)) {
> > run->riscv_sbi.ret[0] = ch;
> > } else {
> > - run->riscv_sbi.ret[0] = -1;
> > + run->riscv_sbi.ret[0] = SBI_ERR_FAILURE;
>
> I'm not sure I follow. This seems like a failure but we report success
> to the caller of this function?
>
> Can you expand the commit message to explain why we want this change
Looking at this again, I think it would be more clear, and more correct,
if we only do the SBI_ERR_FAILURE path for a return value of exactly zero.
...
ret = qemu_chr_fe_read_all(...);
if (ret == sizeof(ch)) {
run->riscv_sbi.ret[0] = ch;
ret = 0;
} else if (ret == 0) {
run->riscv_sbi.ret[0] = SBI_ERR_FAILURE;
}
break;
...
return ret;
Exactly zero just means we failed to read input, which can happen, so
telling the SBI caller we failed to read, but telling the caller of this
function that we successfully emulated the SBI call, is correct. However,
anything else, other than sizeof(ch), means something unexpected happened,
so we should indeed return an error from this function.
Thanks,
drew
>
> Alistair
>
> > }
> > - ret = 0;
> > break;
> > default:
> > qemu_log_mask(LOG_UNIMP,
> > - "%s: un-handled SBI EXIT, specific reasons is %lu\n",
> > + "%s: Unhandled SBI exit with extension-id %lu\n",
> > __func__, run->riscv_sbi.extension_id);
> > - ret = -1;
> > + run->riscv_sbi.ret[0] = SBI_ERR_NOT_SUPPORTED;
> > break;
> > }
> > - return ret;
> > + return 0;
> > }
> >
> > int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
> > diff --git a/target/riscv/sbi_ecall_interface.h b/target/riscv/sbi_ecall_interface.h
> > index 43899d08f6..a2e21d9b8c 100644
> > --- a/target/riscv/sbi_ecall_interface.h
> > +++ b/target/riscv/sbi_ecall_interface.h
> > @@ -69,4 +69,16 @@
> > #define SBI_EXT_VENDOR_END 0x09FFFFFF
> > /* clang-format on */
> >
> > +/* SBI return error codes */
> > +#define SBI_SUCCESS 0
> > +#define SBI_ERR_FAILURE -1
> > +#define SBI_ERR_NOT_SUPPORTED -2
> > +#define SBI_ERR_INVALID_PARAM -3
> > +#define SBI_ERR_DENIED -4
> > +#define SBI_ERR_INVALID_ADDRESS -5
> > +#define SBI_ERR_ALREADY_AVAILABLE -6
> > +#define SBI_ERR_ALREADY_STARTED -7
> > +#define SBI_ERR_ALREADY_STOPPED -8
> > +#define SBI_ERR_NO_SHMEM -9
> > +
> > #endif
> > --
> > 2.34.1
> >
> >
kvm_riscv_handle_sbi() may return not supported return code to not
trigger qemu abort with vendor-specific sbi.
Add new error path to provide proper error in case of
qemu_chr_fe_read_all() may not return sizeof(ch).
Added SBI related return code's defines.
Signed-off-by: Alexei Filippov <alexei.filippov@syntacore.com>
---
Changes since v4-5:
-Added new error path in case of qemu_chr_fe_read_all() may not
return sizeof(ch).
-Added more comments in commit message.
target/riscv/kvm/kvm-cpu.c | 10 ++++++----
target/riscv/sbi_ecall_interface.h | 12 ++++++++++++
2 files changed, 18 insertions(+), 4 deletions(-)
diff --git a/target/riscv/kvm/kvm-cpu.c b/target/riscv/kvm/kvm-cpu.c
index f9dbc18a76..5bb7b74d03 100644
--- a/target/riscv/kvm/kvm-cpu.c
+++ b/target/riscv/kvm/kvm-cpu.c
@@ -1173,16 +1173,18 @@ static int kvm_riscv_handle_sbi(CPUState *cs, struct kvm_run *run)
ret = qemu_chr_fe_read_all(serial_hd(0)->be, &ch, sizeof(ch));
if (ret == sizeof(ch)) {
run->riscv_sbi.ret[0] = ch;
+ ret = 0;
+ } else if (ret == 0) {
+ run->riscv_sbi.ret[0] = SBI_ERR_FAILURE;
} else {
- run->riscv_sbi.ret[0] = -1;
+ ret = -1;
}
- ret = 0;
break;
default:
qemu_log_mask(LOG_UNIMP,
- "%s: un-handled SBI EXIT, specific reasons is %lu\n",
+ "%s: Unhandled SBI exit with extension-id %lu\n"
__func__, run->riscv_sbi.extension_id);
- ret = -1;
+ run->riscv_sbi.ret[0] = SBI_ERR_NOT_SUPPORTED;
break;
}
return ret;
diff --git a/target/riscv/sbi_ecall_interface.h b/target/riscv/sbi_ecall_interface.h
index 43899d08f6..a2e21d9b8c 100644
--- a/target/riscv/sbi_ecall_interface.h
+++ b/target/riscv/sbi_ecall_interface.h
@@ -69,4 +69,16 @@
#define SBI_EXT_VENDOR_END 0x09FFFFFF
/* clang-format on */
+/* SBI return error codes */
+#define SBI_SUCCESS 0
+#define SBI_ERR_FAILURE -1
+#define SBI_ERR_NOT_SUPPORTED -2
+#define SBI_ERR_INVALID_PARAM -3
+#define SBI_ERR_DENIED -4
+#define SBI_ERR_INVALID_ADDRESS -5
+#define SBI_ERR_ALREADY_AVAILABLE -6
+#define SBI_ERR_ALREADY_STARTED -7
+#define SBI_ERR_ALREADY_STOPPED -8
+#define SBI_ERR_NO_SHMEM -9
+
#endif
--
2.34.1On Mon, Apr 22, 2024 at 02:42:54PM +0300, Alexei Filippov wrote:
> kvm_riscv_handle_sbi() may return not supported return code to not
> trigger qemu abort with vendor-specific sbi.
>
> Add new error path to provide proper error in case of
> qemu_chr_fe_read_all() may not return sizeof(ch).
I think something more along the lines of what I wrote in my previous
reply will help clarify this more. Here's what I wrote
"""
Exactly zero just means we failed to read input, which can happen, so
telling the SBI caller we failed to read, but telling the caller of this
function that we successfully emulated the SBI call, is correct. However,
anything else, other than sizeof(ch), means something unexpected happened,
so we should indeed return an error from this function.
"""
Thanks,
drew
>
> Added SBI related return code's defines.
>
> Signed-off-by: Alexei Filippov <alexei.filippov@syntacore.com>
> ---
> Changes since v4-5:
> -Added new error path in case of qemu_chr_fe_read_all() may not
> return sizeof(ch).
> -Added more comments in commit message.
> target/riscv/kvm/kvm-cpu.c | 10 ++++++----
> target/riscv/sbi_ecall_interface.h | 12 ++++++++++++
> 2 files changed, 18 insertions(+), 4 deletions(-)
>
> diff --git a/target/riscv/kvm/kvm-cpu.c b/target/riscv/kvm/kvm-cpu.c
> index f9dbc18a76..5bb7b74d03 100644
> --- a/target/riscv/kvm/kvm-cpu.c
> +++ b/target/riscv/kvm/kvm-cpu.c
> @@ -1173,16 +1173,18 @@ static int kvm_riscv_handle_sbi(CPUState *cs, struct kvm_run *run)
> ret = qemu_chr_fe_read_all(serial_hd(0)->be, &ch, sizeof(ch));
> if (ret == sizeof(ch)) {
> run->riscv_sbi.ret[0] = ch;
> + ret = 0;
> + } else if (ret == 0) {
> + run->riscv_sbi.ret[0] = SBI_ERR_FAILURE;
> } else {
> - run->riscv_sbi.ret[0] = -1;
> + ret = -1;
> }
> - ret = 0;
> break;
> default:
> qemu_log_mask(LOG_UNIMP,
> - "%s: un-handled SBI EXIT, specific reasons is %lu\n",
> + "%s: Unhandled SBI exit with extension-id %lu\n"
> __func__, run->riscv_sbi.extension_id);
> - ret = -1;
> + run->riscv_sbi.ret[0] = SBI_ERR_NOT_SUPPORTED;
> break;
> }
> return ret;
> diff --git a/target/riscv/sbi_ecall_interface.h b/target/riscv/sbi_ecall_interface.h
> index 43899d08f6..a2e21d9b8c 100644
> --- a/target/riscv/sbi_ecall_interface.h
> +++ b/target/riscv/sbi_ecall_interface.h
> @@ -69,4 +69,16 @@
> #define SBI_EXT_VENDOR_END 0x09FFFFFF
> /* clang-format on */
>
> +/* SBI return error codes */
> +#define SBI_SUCCESS 0
> +#define SBI_ERR_FAILURE -1
> +#define SBI_ERR_NOT_SUPPORTED -2
> +#define SBI_ERR_INVALID_PARAM -3
> +#define SBI_ERR_DENIED -4
> +#define SBI_ERR_INVALID_ADDRESS -5
> +#define SBI_ERR_ALREADY_AVAILABLE -6
> +#define SBI_ERR_ALREADY_STARTED -7
> +#define SBI_ERR_ALREADY_STOPPED -8
> +#define SBI_ERR_NO_SHMEM -9
> +
> #endif
> --
> 2.34.1
>
On Mon, Apr 22, 2024 at 02:31:36PM +0200, Andrew Jones wrote:
> On Mon, Apr 22, 2024 at 02:42:54PM +0300, Alexei Filippov wrote:
> > kvm_riscv_handle_sbi() may return not supported return code to not
> > trigger qemu abort with vendor-specific sbi.
> >
> > Add new error path to provide proper error in case of
> > qemu_chr_fe_read_all() may not return sizeof(ch).
>
> I think something more along the lines of what I wrote in my previous
> reply will help clarify this more. Here's what I wrote
>
> """
> Exactly zero just means we failed to read input, which can happen, so
> telling the SBI caller we failed to read, but telling the caller of this
> function that we successfully emulated the SBI call, is correct. However,
> anything else, other than sizeof(ch), means something unexpected happened,
> so we should indeed return an error from this function.
> """
>
> Thanks,
> drew
>
> >
> > Added SBI related return code's defines.
> >
> > Signed-off-by: Alexei Filippov <alexei.filippov@syntacore.com>
> > ---
> > Changes since v4-5:
> > -Added new error path in case of qemu_chr_fe_read_all() may not
> > return sizeof(ch).
> > -Added more comments in commit message.
> > target/riscv/kvm/kvm-cpu.c | 10 ++++++----
> > target/riscv/sbi_ecall_interface.h | 12 ++++++++++++
> > 2 files changed, 18 insertions(+), 4 deletions(-)
> >
> > diff --git a/target/riscv/kvm/kvm-cpu.c b/target/riscv/kvm/kvm-cpu.c
> > index f9dbc18a76..5bb7b74d03 100644
> > --- a/target/riscv/kvm/kvm-cpu.c
> > +++ b/target/riscv/kvm/kvm-cpu.c
> > @@ -1173,16 +1173,18 @@ static int kvm_riscv_handle_sbi(CPUState *cs, struct kvm_run *run)
> > ret = qemu_chr_fe_read_all(serial_hd(0)->be, &ch, sizeof(ch));
> > if (ret == sizeof(ch)) {
> > run->riscv_sbi.ret[0] = ch;
> > + ret = 0;
> > + } else if (ret == 0) {
> > + run->riscv_sbi.ret[0] = SBI_ERR_FAILURE;
I'd prefer we still explicitly assign ret[0] to -1 here since that's what
the spec explicitly says.
Thanks,
drew
> > } else {
> > - run->riscv_sbi.ret[0] = -1;
> > + ret = -1;
> > }
> > - ret = 0;
> > break;
> > default:
> > qemu_log_mask(LOG_UNIMP,
> > - "%s: un-handled SBI EXIT, specific reasons is %lu\n",
> > + "%s: Unhandled SBI exit with extension-id %lu\n"
> > __func__, run->riscv_sbi.extension_id);
> > - ret = -1;
> > + run->riscv_sbi.ret[0] = SBI_ERR_NOT_SUPPORTED;
> > break;
> > }
> > return ret;
> > diff --git a/target/riscv/sbi_ecall_interface.h b/target/riscv/sbi_ecall_interface.h
> > index 43899d08f6..a2e21d9b8c 100644
> > --- a/target/riscv/sbi_ecall_interface.h
> > +++ b/target/riscv/sbi_ecall_interface.h
> > @@ -69,4 +69,16 @@
> > #define SBI_EXT_VENDOR_END 0x09FFFFFF
> > /* clang-format on */
> >
> > +/* SBI return error codes */
> > +#define SBI_SUCCESS 0
> > +#define SBI_ERR_FAILURE -1
> > +#define SBI_ERR_NOT_SUPPORTED -2
> > +#define SBI_ERR_INVALID_PARAM -3
> > +#define SBI_ERR_DENIED -4
> > +#define SBI_ERR_INVALID_ADDRESS -5
> > +#define SBI_ERR_ALREADY_AVAILABLE -6
> > +#define SBI_ERR_ALREADY_STARTED -7
> > +#define SBI_ERR_ALREADY_STOPPED -8
> > +#define SBI_ERR_NO_SHMEM -9
> > +
> > #endif
> > --
> > 2.34.1
> >
kvm_riscv_handle_sbi() may return not supported return code to not
trigger qemu abort with vendor-specific sbi.
Add new error path to provide proper error in case of
qemu_chr_fe_read_all() may not return sizeof(ch).
Added SBI related return code's defines.
Signed-off-by: Alexei Filippov <alexei.filippov@syntacore.com>
---
target/riscv/kvm/kvm-cpu.c | 9 +++++----
target/riscv/sbi_ecall_interface.h | 1 +
2 files changed, 6 insertions(+), 4 deletions(-)
diff --git a/target/riscv/kvm/kvm-cpu.c b/target/riscv/kvm/kvm-cpu.c
index aeca1e3e83..5bb7b74d03 100644
--- a/target/riscv/kvm/kvm-cpu.c
+++ b/target/riscv/kvm/kvm-cpu.c
@@ -1173,17 +1173,18 @@ static int kvm_riscv_handle_sbi(CPUState *cs, struct kvm_run *run)
ret = qemu_chr_fe_read_all(serial_hd(0)->be, &ch, sizeof(ch));
if (ret == sizeof(ch)) {
run->riscv_sbi.ret[0] = ch;
- } else {
+ ret = 0;
+ } else if (ret == 0) {
run->riscv_sbi.ret[0] = SBI_ERR_FAILURE;
+ } else {
+ ret = -1;
}
- ret = 0;
break;
default:
qemu_log_mask(LOG_UNIMP,
- "%s: un-handled SBI EXIT, specific reasons is %lu\n",
+ "%s: Unhandled SBI exit with extension-id %lu\n"
__func__, run->riscv_sbi.extension_id);
run->riscv_sbi.ret[0] = SBI_ERR_NOT_SUPPORTED;
- ret = 0;
break;
}
return ret;
diff --git a/target/riscv/sbi_ecall_interface.h b/target/riscv/sbi_ecall_interface.h
index 0279e92a36..a2e21d9b8c 100644
--- a/target/riscv/sbi_ecall_interface.h
+++ b/target/riscv/sbi_ecall_interface.h
@@ -79,5 +79,6 @@
#define SBI_ERR_ALREADY_AVAILABLE -6
#define SBI_ERR_ALREADY_STARTED -7
#define SBI_ERR_ALREADY_STOPPED -8
+#define SBI_ERR_NO_SHMEM -9
#endif
--
2.34.1
On 22.04.2024 14:24, Alexei Filippov wrote:
> kvm_riscv_handle_sbi() may return not supported return code to not
> trigger qemu abort with vendor-specific sbi.
>
> Add new error path to provide proper error in case of
> qemu_chr_fe_read_all() may not return sizeof(ch).
>
> Added SBI related return code's defines.
>
> Signed-off-by: Alexei Filippov <alexei.filippov@syntacore.com>
> ---
> target/riscv/kvm/kvm-cpu.c | 9 +++++----
> target/riscv/sbi_ecall_interface.h | 1 +
> 2 files changed, 6 insertions(+), 4 deletions(-)
>
> diff --git a/target/riscv/kvm/kvm-cpu.c b/target/riscv/kvm/kvm-cpu.c
> index aeca1e3e83..5bb7b74d03 100644
> --- a/target/riscv/kvm/kvm-cpu.c
> +++ b/target/riscv/kvm/kvm-cpu.c
> @@ -1173,17 +1173,18 @@ static int kvm_riscv_handle_sbi(CPUState *cs, struct kvm_run *run)
> ret = qemu_chr_fe_read_all(serial_hd(0)->be, &ch, sizeof(ch));
> if (ret == sizeof(ch)) {
> run->riscv_sbi.ret[0] = ch;
> - } else {
> + ret = 0;
> + } else if (ret == 0) {
> run->riscv_sbi.ret[0] = SBI_ERR_FAILURE;
> + } else {
> + ret = -1;
> }
> - ret = 0;
> break;
> default:
> qemu_log_mask(LOG_UNIMP,
> - "%s: un-handled SBI EXIT, specific reasons is %lu\n",
> + "%s: Unhandled SBI exit with extension-id %lu\n"
> __func__, run->riscv_sbi.extension_id);
> run->riscv_sbi.ret[0] = SBI_ERR_NOT_SUPPORTED;
> - ret = 0;
> break;
> }
> return ret;
> diff --git a/target/riscv/sbi_ecall_interface.h b/target/riscv/sbi_ecall_interface.h
> index 0279e92a36..a2e21d9b8c 100644
> --- a/target/riscv/sbi_ecall_interface.h
> +++ b/target/riscv/sbi_ecall_interface.h
> @@ -79,5 +79,6 @@
> #define SBI_ERR_ALREADY_AVAILABLE -6
> #define SBI_ERR_ALREADY_STARTED -7
> #define SBI_ERR_ALREADY_STOPPED -8
> +#define SBI_ERR_NO_SHMEM -9
>
> #endif
Oh, my bad, wrong patch. Will resend properly.
--
Sincerely,
Aleksei Filippov
On Sat, Apr 13, 2024 at 02:25:26PM +0300, Alexei Filippov wrote:
> kvm_riscv_handle_sbi() may return not supported return code to not trigger
> qemu abort with vendor-specific sbi.
>
> Added SBI related return code's defines.
>
> Signed-off-by: Alexei Filippov <alexei.filippov@syntacore.com>
> Fixes: 4eb47125 ("target/riscv: Handle KVM_EXIT_RISCV_SBI exit")
> ---
>
> Changes since v3:
> -Clear Reviewed-by tags
> target/riscv/kvm/kvm-cpu.c | 13 +++++--------
> target/riscv/sbi_ecall_interface.h | 12 ++++++++++++
> 2 files changed, 17 insertions(+), 8 deletions(-)
>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
On Mon, Mar 25, 2024 at 11:46 PM Alexei Filippov
<alexei.filippov@syntacore.com> wrote:
>
> kvm_riscv_handle_sbi() may return not supported return code to not trigger
> qemu abort with vendor-specific sbi.
>
> Added SBI related return code's defines.
>
> Signed-off-by: Alexei Filippov <alexei.filippov@syntacore.com>
> Fixes: 4eb47125 ("target/riscv: Handle KVM_EXIT_RISCV_SBI exit")
> Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Alistair
> ---
>
> Changes since v1:
> -Add Fixes and Revied-by lines.
> target/riscv/kvm/kvm-cpu.c | 5 +++--
> target/riscv/sbi_ecall_interface.h | 11 +++++++++++
> 2 files changed, 14 insertions(+), 2 deletions(-)
>
> diff --git a/target/riscv/kvm/kvm-cpu.c b/target/riscv/kvm/kvm-cpu.c
> index 6a6c6cae80..a4f84ad950 100644
> --- a/target/riscv/kvm/kvm-cpu.c
> +++ b/target/riscv/kvm/kvm-cpu.c
> @@ -1404,7 +1404,7 @@ static int kvm_riscv_handle_sbi(CPUState *cs, struct kvm_run *run)
> if (ret == sizeof(ch)) {
> run->riscv_sbi.ret[0] = ch;
> } else {
> - run->riscv_sbi.ret[0] = -1;
> + run->riscv_sbi.ret[0] = SBI_ERR_FAILURE;
> }
> ret = 0;
> break;
> @@ -1412,7 +1412,8 @@ static int kvm_riscv_handle_sbi(CPUState *cs, struct kvm_run *run)
> qemu_log_mask(LOG_UNIMP,
> "%s: un-handled SBI EXIT, specific reasons is %lu\n",
> __func__, run->riscv_sbi.extension_id);
> - ret = -1;
> + run->riscv_sbi.ret[0] = SBI_ERR_NOT_SUPPORTED;
> + ret = 0;
> break;
> }
> return ret;
> diff --git a/target/riscv/sbi_ecall_interface.h b/target/riscv/sbi_ecall_interface.h
> index 43899d08f6..0279e92a36 100644
> --- a/target/riscv/sbi_ecall_interface.h
> +++ b/target/riscv/sbi_ecall_interface.h
> @@ -69,4 +69,15 @@
> #define SBI_EXT_VENDOR_END 0x09FFFFFF
> /* clang-format on */
>
> +/* SBI return error codes */
> +#define SBI_SUCCESS 0
> +#define SBI_ERR_FAILURE -1
> +#define SBI_ERR_NOT_SUPPORTED -2
> +#define SBI_ERR_INVALID_PARAM -3
> +#define SBI_ERR_DENIED -4
> +#define SBI_ERR_INVALID_ADDRESS -5
> +#define SBI_ERR_ALREADY_AVAILABLE -6
> +#define SBI_ERR_ALREADY_STARTED -7
> +#define SBI_ERR_ALREADY_STOPPED -8
> +
> #endif
> --
> 2.34.1
>
>
kvm_riscv_handle_sbi() may return not supported return code to not trigger
qemu abort with vendor-specific sbi.
Added SBI related return code's defines.
Signed-off-by: Alexei Filippov <alexei.filippov@syntacore.com>
Fixes: 4eb47125 ("target/riscv: Handle KVM_EXIT_RISCV_SBI exit")
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
---
Changes since v2:
-Clear kvm_riscv_handle_sbi()
-Add SBI_ERR_NO_SHMEM return code's define
target/riscv/kvm/kvm-cpu.c | 13 +++++--------
target/riscv/sbi_ecall_interface.h | 12 ++++++++++++
2 files changed, 17 insertions(+), 8 deletions(-)
diff --git a/target/riscv/kvm/kvm-cpu.c b/target/riscv/kvm/kvm-cpu.c
index 6a6c6cae80..844942d9ba 100644
--- a/target/riscv/kvm/kvm-cpu.c
+++ b/target/riscv/kvm/kvm-cpu.c
@@ -1392,7 +1392,6 @@ bool kvm_arch_stop_on_emulation_error(CPUState *cs)
static int kvm_riscv_handle_sbi(CPUState *cs, struct kvm_run *run)
{
- int ret = 0;
unsigned char ch;
switch (run->riscv_sbi.extension_id) {
case SBI_EXT_0_1_CONSOLE_PUTCHAR:
@@ -1400,22 +1399,20 @@ static int kvm_riscv_handle_sbi(CPUState *cs, struct kvm_run *run)
qemu_chr_fe_write(serial_hd(0)->be, &ch, sizeof(ch));
break;
case SBI_EXT_0_1_CONSOLE_GETCHAR:
- ret = qemu_chr_fe_read_all(serial_hd(0)->be, &ch, sizeof(ch));
- if (ret == sizeof(ch)) {
+ if (qemu_chr_fe_read_all(serial_hd(0)->be, &ch, sizeof(ch)) == sizeof(ch)) {
run->riscv_sbi.ret[0] = ch;
} else {
- run->riscv_sbi.ret[0] = -1;
+ run->riscv_sbi.ret[0] = SBI_ERR_FAILURE;
}
- ret = 0;
break;
default:
qemu_log_mask(LOG_UNIMP,
- "%s: un-handled SBI EXIT, specific reasons is %lu\n",
+ "%s: Unhandled SBI exit with extension-id %lu\n",
__func__, run->riscv_sbi.extension_id);
- ret = -1;
+ run->riscv_sbi.ret[0] = SBI_ERR_NOT_SUPPORTED;
break;
}
- return ret;
+ return 0;
}
int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
diff --git a/target/riscv/sbi_ecall_interface.h b/target/riscv/sbi_ecall_interface.h
index 43899d08f6..a2e21d9b8c 100644
--- a/target/riscv/sbi_ecall_interface.h
+++ b/target/riscv/sbi_ecall_interface.h
@@ -69,4 +69,16 @@
#define SBI_EXT_VENDOR_END 0x09FFFFFF
/* clang-format on */
+/* SBI return error codes */
+#define SBI_SUCCESS 0
+#define SBI_ERR_FAILURE -1
+#define SBI_ERR_NOT_SUPPORTED -2
+#define SBI_ERR_INVALID_PARAM -3
+#define SBI_ERR_DENIED -4
+#define SBI_ERR_INVALID_ADDRESS -5
+#define SBI_ERR_ALREADY_AVAILABLE -6
+#define SBI_ERR_ALREADY_STARTED -7
+#define SBI_ERR_ALREADY_STOPPED -8
+#define SBI_ERR_NO_SHMEM -9
+
#endif
--
2.34.1© 2016 - 2024 Red Hat, Inc.