Contributors: 3
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Bibo Mao |
147 |
95.45% |
1 |
20.00% |
| David Matlack |
6 |
3.90% |
3 |
60.00% |
| Sean Christopherson |
1 |
0.65% |
1 |
20.00% |
| Total |
154 |
|
5 |
|
// SPDX-License-Identifier: GPL-2.0
/*
* ucall support. A ucall is a "hypercall to userspace".
*
*/
#include "kvm_util.h"
/*
* ucall_exit_mmio_addr holds per-VM values (global data is duplicated by each
* VM), it must not be accessed from host code.
*/
gva_t *ucall_exit_mmio_addr;
void ucall_arch_init(struct kvm_vm *vm, gpa_t mmio_gpa)
{
gva_t mmio_gva = vm_unused_gva_gap(vm, vm->page_size, KVM_UTIL_MIN_VADDR);
virt_map(vm, mmio_gva, mmio_gpa, 1);
vm->ucall_mmio_addr = mmio_gpa;
write_guest_global(vm, ucall_exit_mmio_addr, (gva_t *)mmio_gva);
}
void *ucall_arch_get_ucall(struct kvm_vcpu *vcpu)
{
struct kvm_run *run = vcpu->run;
if (run->exit_reason == KVM_EXIT_MMIO &&
run->mmio.phys_addr == vcpu->vm->ucall_mmio_addr) {
TEST_ASSERT(run->mmio.is_write && run->mmio.len == sizeof(u64),
"Unexpected ucall exit mmio address access");
return (void *)(*((u64 *)run->mmio.data));
}
return NULL;
}