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KVM: selftests: Add ucall test support for LoongArch

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Add ucall test support for LoongArch, ucall method on LoongArch uses
undefined mmio area. It will cause vCPU exiting to hypervisor so that
hypervisor can communicate with vCPU.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Bibo Mao 2025-05-20 20:20:26 +08:00 committed by Huacai Chen
parent 2ebf31d59f
commit 304b93b1a0
2 changed files with 58 additions and 0 deletions
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20
tools/testing/selftests/kvm/include/loongarch/ucall.h Normal file
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/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef SELFTEST_KVM_UCALL_H
#define SELFTEST_KVM_UCALL_H
#include "kvm_util.h"
#define UCALL_EXIT_REASON KVM_EXIT_MMIO
/*
* ucall_exit_mmio_addr holds per-VM values (global data is duplicated by each
* VM), it must not be accessed from host code.
*/
extern vm_vaddr_t *ucall_exit_mmio_addr;
static inline void ucall_arch_do_ucall(vm_vaddr_t uc)
{
WRITE_ONCE(*ucall_exit_mmio_addr, uc);
}
#endif

38
tools/testing/selftests/kvm/lib/loongarch/ucall.c Normal file
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// 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.
*/
vm_vaddr_t *ucall_exit_mmio_addr;
void ucall_arch_init(struct kvm_vm *vm, vm_paddr_t mmio_gpa)
{
vm_vaddr_t mmio_gva = vm_vaddr_unused_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, (vm_vaddr_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(uint64_t),
"Unexpected ucall exit mmio address access");
return (void *)(*((uint64_t *)run->mmio.data));
}
return NULL;
}