| Message ID | 20230214212303.3307536-1-quic_eberman@quicinc.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Drivers for Gunyah hypervisor | expand |
On 2/14/23 3:23 PM, Elliot Berman wrote: > Add hypercalls to send and receive messages on a Gunyah message queue. > > Signed-off-by: Elliot Berman <quic_eberman@quicinc.com> > --- > arch/arm64/gunyah/gunyah_hypercall.c | 32 ++++++++++++++++++++++++++++ > include/linux/gunyah.h | 7 ++++++ > 2 files changed, 39 insertions(+) > > diff --git a/arch/arm64/gunyah/gunyah_hypercall.c b/arch/arm64/gunyah/gunyah_hypercall.c > index f30d06ee80cf..2ca9ab098ff6 100644 > --- a/arch/arm64/gunyah/gunyah_hypercall.c > +++ b/arch/arm64/gunyah/gunyah_hypercall.c > @@ -38,6 +38,8 @@ EXPORT_SYMBOL_GPL(arch_is_gunyah_guest); > fn) > > #define GH_HYPERCALL_HYP_IDENTIFY GH_HYPERCALL(0x8000) > +#define GH_HYPERCALL_MSGQ_SEND GH_HYPERCALL(0x801B) > +#define GH_HYPERCALL_MSGQ_RECV GH_HYPERCALL(0x801C) > > /** > * gh_hypercall_hyp_identify() - Returns build information and feature flags > @@ -57,5 +59,35 @@ void gh_hypercall_hyp_identify(struct gh_hypercall_hyp_identify_resp *hyp_identi > } > EXPORT_SYMBOL_GPL(gh_hypercall_hyp_identify); > > +enum gh_error gh_hypercall_msgq_send(u64 capid, size_t size, uintptr_t buff, int tx_flags, > + bool *ready) > +{ > + struct arm_smccc_res res; > + > + arm_smccc_1_1_hvc(GH_HYPERCALL_MSGQ_SEND, capid, size, buff, tx_flags, 0, &res); > + > + if (res.a0 == GH_ERROR_OK) > + *ready = res.a1; > + > + return res.a0; > +} > +EXPORT_SYMBOL_GPL(gh_hypercall_msgq_send); > + > +enum gh_error gh_hypercall_msgq_recv(u64 capid, uintptr_t buff, size_t size, size_t *recv_size, > + bool *ready) > +{ > + struct arm_smccc_res res; > + > + arm_smccc_1_1_hvc(GH_HYPERCALL_MSGQ_RECV, capid, buff, size, 0, &res); > + > + if (res.a0 == GH_ERROR_OK) { > + *recv_size = res.a1; Is there any chance the 64-bit size is incompatible with size_t? (Too big?) > + *ready = res.a2; *ready = !!res.a2; > + } > + > + return res.a0; > +} > +EXPORT_SYMBOL_GPL(gh_hypercall_msgq_recv); > + > MODULE_LICENSE("GPL"); > MODULE_DESCRIPTION("Gunyah Hypervisor Hypercalls"); > diff --git a/include/linux/gunyah.h b/include/linux/gunyah.h > index 3fef2854c5e1..cb6df4eec5c2 100644 > --- a/include/linux/gunyah.h > +++ b/include/linux/gunyah.h > @@ -112,4 +112,11 @@ struct gh_hypercall_hyp_identify_resp { > > void gh_hypercall_hyp_identify(struct gh_hypercall_hyp_identify_resp *hyp_identity); > > +#define GH_HYPERCALL_MSGQ_TX_FLAGS_PUSH BIT(0) > + > +enum gh_error gh_hypercall_msgq_send(u64 capid, size_t size, uintptr_t buff, int tx_flags, > + bool *ready); Why uintptr_t? Why not just pass a host pointer (void *) and do whatever conversion is necessary inside the function? -Alex > +enum gh_error gh_hypercall_msgq_recv(u64 capid, uintptr_t buff, size_t size, size_t *recv_size, > + bool *ready); > + > #endif
On 2/23/2023 4:15 PM, Alex Elder wrote: > On 2/14/23 3:23 PM, Elliot Berman wrote: >> Add hypercalls to send and receive messages on a Gunyah message queue. >> >> Signed-off-by: Elliot Berman <quic_eberman@quicinc.com> >> --- >> arch/arm64/gunyah/gunyah_hypercall.c | 32 ++++++++++++++++++++++++++++ >> include/linux/gunyah.h | 7 ++++++ >> 2 files changed, 39 insertions(+) >> >> diff --git a/arch/arm64/gunyah/gunyah_hypercall.c >> b/arch/arm64/gunyah/gunyah_hypercall.c >> index f30d06ee80cf..2ca9ab098ff6 100644 >> --- a/arch/arm64/gunyah/gunyah_hypercall.c >> +++ b/arch/arm64/gunyah/gunyah_hypercall.c >> @@ -38,6 +38,8 @@ EXPORT_SYMBOL_GPL(arch_is_gunyah_guest); >> fn) >> #define GH_HYPERCALL_HYP_IDENTIFY GH_HYPERCALL(0x8000) >> +#define GH_HYPERCALL_MSGQ_SEND GH_HYPERCALL(0x801B) >> +#define GH_HYPERCALL_MSGQ_RECV GH_HYPERCALL(0x801C) >> /** >> * gh_hypercall_hyp_identify() - Returns build information and >> feature flags >> @@ -57,5 +59,35 @@ void gh_hypercall_hyp_identify(struct >> gh_hypercall_hyp_identify_resp *hyp_identi >> } >> EXPORT_SYMBOL_GPL(gh_hypercall_hyp_identify); >> +enum gh_error gh_hypercall_msgq_send(u64 capid, size_t size, >> uintptr_t buff, int tx_flags, >> + bool *ready) >> +{ >> + struct arm_smccc_res res; >> + >> + arm_smccc_1_1_hvc(GH_HYPERCALL_MSGQ_SEND, capid, size, buff, >> tx_flags, 0, &res); >> + >> + if (res.a0 == GH_ERROR_OK) >> + *ready = res.a1; >> + >> + return res.a0; >> +} >> +EXPORT_SYMBOL_GPL(gh_hypercall_msgq_send); >> + >> +enum gh_error gh_hypercall_msgq_recv(u64 capid, uintptr_t buff, >> size_t size, size_t *recv_size, >> + bool *ready) >> +{ >> + struct arm_smccc_res res; >> + >> + arm_smccc_1_1_hvc(GH_HYPERCALL_MSGQ_RECV, capid, buff, size, 0, >> &res); >> + >> + if (res.a0 == GH_ERROR_OK) { >> + *recv_size = res.a1; > > Is there any chance the 64-bit size is incompatible > with size_t? (Too big?) This is safe because size of messages <= 240. > >> + *ready = res.a2; > > *ready = !!res.a2; > >> + } >> + >> + return res.a0; >> +} >> +EXPORT_SYMBOL_GPL(gh_hypercall_msgq_recv); >> + >> MODULE_LICENSE("GPL"); >> MODULE_DESCRIPTION("Gunyah Hypervisor Hypercalls"); >> diff --git a/include/linux/gunyah.h b/include/linux/gunyah.h >> index 3fef2854c5e1..cb6df4eec5c2 100644 >> --- a/include/linux/gunyah.h >> +++ b/include/linux/gunyah.h >> @@ -112,4 +112,11 @@ struct gh_hypercall_hyp_identify_resp { >> void gh_hypercall_hyp_identify(struct gh_hypercall_hyp_identify_resp >> *hyp_identity); >> +#define GH_HYPERCALL_MSGQ_TX_FLAGS_PUSH BIT(0) >> + >> +enum gh_error gh_hypercall_msgq_send(u64 capid, size_t size, >> uintptr_t buff, int tx_flags, >> + bool *ready); > > Why uintptr_t? Why not just pass a host pointer (void *) > and do whatever conversion is necessary inside the function? > > -Alex > >> +enum gh_error gh_hypercall_msgq_recv(u64 capid, uintptr_t buff, >> size_t size, size_t *recv_size, >> + bool *ready); >> + >> #endif >
diff --git a/arch/arm64/gunyah/gunyah_hypercall.c b/arch/arm64/gunyah/gunyah_hypercall.c index f30d06ee80cf..2ca9ab098ff6 100644 --- a/arch/arm64/gunyah/gunyah_hypercall.c +++ b/arch/arm64/gunyah/gunyah_hypercall.c @@ -38,6 +38,8 @@ EXPORT_SYMBOL_GPL(arch_is_gunyah_guest); fn) #define GH_HYPERCALL_HYP_IDENTIFY GH_HYPERCALL(0x8000) +#define GH_HYPERCALL_MSGQ_SEND GH_HYPERCALL(0x801B) +#define GH_HYPERCALL_MSGQ_RECV GH_HYPERCALL(0x801C) /** * gh_hypercall_hyp_identify() - Returns build information and feature flags @@ -57,5 +59,35 @@ void gh_hypercall_hyp_identify(struct gh_hypercall_hyp_identify_resp *hyp_identi } EXPORT_SYMBOL_GPL(gh_hypercall_hyp_identify); +enum gh_error gh_hypercall_msgq_send(u64 capid, size_t size, uintptr_t buff, int tx_flags, + bool *ready) +{ + struct arm_smccc_res res; + + arm_smccc_1_1_hvc(GH_HYPERCALL_MSGQ_SEND, capid, size, buff, tx_flags, 0, &res); + + if (res.a0 == GH_ERROR_OK) + *ready = res.a1; + + return res.a0; +} +EXPORT_SYMBOL_GPL(gh_hypercall_msgq_send); + +enum gh_error gh_hypercall_msgq_recv(u64 capid, uintptr_t buff, size_t size, size_t *recv_size, + bool *ready) +{ + struct arm_smccc_res res; + + arm_smccc_1_1_hvc(GH_HYPERCALL_MSGQ_RECV, capid, buff, size, 0, &res); + + if (res.a0 == GH_ERROR_OK) { + *recv_size = res.a1; + *ready = res.a2; + } + + return res.a0; +} +EXPORT_SYMBOL_GPL(gh_hypercall_msgq_recv); + MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Gunyah Hypervisor Hypercalls"); diff --git a/include/linux/gunyah.h b/include/linux/gunyah.h index 3fef2854c5e1..cb6df4eec5c2 100644 --- a/include/linux/gunyah.h +++ b/include/linux/gunyah.h @@ -112,4 +112,11 @@ struct gh_hypercall_hyp_identify_resp { void gh_hypercall_hyp_identify(struct gh_hypercall_hyp_identify_resp *hyp_identity); +#define GH_HYPERCALL_MSGQ_TX_FLAGS_PUSH BIT(0) + +enum gh_error gh_hypercall_msgq_send(u64 capid, size_t size, uintptr_t buff, int tx_flags, + bool *ready); +enum gh_error gh_hypercall_msgq_recv(u64 capid, uintptr_t buff, size_t size, size_t *recv_size, + bool *ready); + #endif
Add hypercalls to send and receive messages on a Gunyah message queue. Signed-off-by: Elliot Berman <quic_eberman@quicinc.com> --- arch/arm64/gunyah/gunyah_hypercall.c | 32 ++++++++++++++++++++++++++++ include/linux/gunyah.h | 7 ++++++ 2 files changed, 39 insertions(+)