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FROMLIST: virt: gunyah: Add hypercalls for running a vCPU

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Add hypercall to donate CPU time to a vCPU.

Bug: 338347082
Link: https://lore.kernel.org/all/20240222-gunyah-v17-14-1e9da6763d38@quicinc.com/
Change-Id: I3dedba8838d132d9e566003d3d1e29f52d341c89
Signed-off-by: Elliot Berman <quic_eberman@quicinc.com>
Signed-off-by: Elliot Berman <elliot.berman@oss.qualcomm.com>
This commit is contained in:
Elliot Berman
2024-02-22 15:16:37 -08:00
committed by Treehugger Robot
parent 93af311a26
commit a020b65c2b
2 changed files with 72 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
arch/arm64/gunyah/gunyah_hypercall.c
+37
View File
@@ -39,6 +39,7 @@ EXPORT_SYMBOL_GPL(arch_is_gunyah_guest);
#define GUNYAH_HYPERCALL_HYP_IDENTIFY GUNYAH_HYPERCALL(0x8000)
#define GUNYAH_HYPERCALL_MSGQ_SEND GUNYAH_HYPERCALL(0x801B)
#define GUNYAH_HYPERCALL_MSGQ_RECV GUNYAH_HYPERCALL(0x801C)
#define GUNYAH_HYPERCALL_VCPU_RUN GUNYAH_HYPERCALL(0x8065)
/* clang-format on */
/**
@@ -113,5 +114,41 @@ enum gunyah_error gunyah_hypercall_msgq_recv(u64 capid, void *buff, size_t size,
}
EXPORT_SYMBOL_GPL(gunyah_hypercall_msgq_recv);
/**
* gunyah_hypercall_vcpu_run() - Donate CPU time to a vcpu
* @capid: capability ID of the vCPU to run
* @resume_data: Array of 3 state-specific resume data
* @resp: Filled reason why vCPU exited when return value is GUNYAH_ERROR_OK
*
* See also:
* https://github.com/quic/gunyah-hypervisor/blob/develop/docs/api/gunyah_api.md#run-a-proxy-scheduled-vcpu-thread
*/
enum gunyah_error
gunyah_hypercall_vcpu_run(u64 capid, unsigned long *resume_data,
struct gunyah_hypercall_vcpu_run_resp *resp)
{
struct arm_smccc_1_2_regs args = {
.a0 = GUNYAH_HYPERCALL_VCPU_RUN,
.a1 = capid,
.a2 = resume_data[0],
.a3 = resume_data[1],
.a4 = resume_data[2],
/* C language says this will be implictly zero. Gunyah requires 0, so be explicit */
.a5 = 0,
};
struct arm_smccc_1_2_regs res;
arm_smccc_1_2_hvc(&args, &res);
if (res.a0 == GUNYAH_ERROR_OK) {
resp->sized_state = res.a1;
resp->state_data[0] = res.a2;
resp->state_data[1] = res.a3;
resp->state_data[2] = res.a4;
}
return res.a0;
}
EXPORT_SYMBOL_GPL(gunyah_hypercall_vcpu_run);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Gunyah Hypervisor Hypercalls");
include/linux/gunyah.h
+35
View File
@@ -273,4 +273,39 @@ enum gunyah_error gunyah_hypercall_msgq_send(u64 capid, size_t size, void *buff,
enum gunyah_error gunyah_hypercall_msgq_recv(u64 capid, void *buff, size_t size,
size_t *recv_size, bool *ready);
struct gunyah_hypercall_vcpu_run_resp {
union {
enum {
/* clang-format off */
/* VCPU is ready to run */
GUNYAH_VCPU_STATE_READY = 0,
/* VCPU is sleeping until an interrupt arrives */
GUNYAH_VCPU_STATE_EXPECTS_WAKEUP = 1,
/* VCPU is powered off */
GUNYAH_VCPU_STATE_POWERED_OFF = 2,
/* VCPU is blocked in EL2 for unspecified reason */
GUNYAH_VCPU_STATE_BLOCKED = 3,
/* VCPU has returned for MMIO READ */
GUNYAH_VCPU_ADDRSPACE_VMMIO_READ = 4,
/* VCPU has returned for MMIO WRITE */
GUNYAH_VCPU_ADDRSPACE_VMMIO_WRITE = 5,
/* VCPU blocked on fault where we can demand page */
GUNYAH_VCPU_ADDRSPACE_PAGE_FAULT = 7,
/* clang-format on */
} state;
u64 sized_state;
};
u64 state_data[3];
};
enum {
GUNYAH_ADDRSPACE_VMMIO_ACTION_EMULATE = 0,
GUNYAH_ADDRSPACE_VMMIO_ACTION_RETRY = 1,
GUNYAH_ADDRSPACE_VMMIO_ACTION_FAULT = 2,
};
enum gunyah_error
gunyah_hypercall_vcpu_run(u64 capid, unsigned long *resume_data,
struct gunyah_hypercall_vcpu_run_resp *resp);
#endif