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https://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git
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b35f4c73d3
Add an architecture specific ucall.h and inline the simple arch hooks, e.g. the init hook for everything except ARM, and the actual "do ucall" hook for everything except x86 (which should be simple, but temporarily isn't due to carrying a workaround). Having a per-arch ucall header will allow adding a #define for the expected KVM exit reason for a ucall that is colocated (for everything except x86) with the ucall itself. Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Link: https://lore.kernel.org/r/20230731203026.1192091-2-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
35 lines
872 B
C
35 lines
872 B
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* ucall support. A ucall is a "hypercall to userspace".
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*
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* Copyright (C) 2018, Red Hat, Inc.
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*/
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#include "kvm_util.h"
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vm_vaddr_t *ucall_exit_mmio_addr;
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void ucall_arch_init(struct kvm_vm *vm, vm_paddr_t mmio_gpa)
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{
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vm_vaddr_t mmio_gva = vm_vaddr_unused_gap(vm, vm->page_size, KVM_UTIL_MIN_VADDR);
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virt_map(vm, mmio_gva, mmio_gpa, 1);
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vm->ucall_mmio_addr = mmio_gpa;
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write_guest_global(vm, ucall_exit_mmio_addr, (vm_vaddr_t *)mmio_gva);
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}
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void *ucall_arch_get_ucall(struct kvm_vcpu *vcpu)
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{
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struct kvm_run *run = vcpu->run;
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if (run->exit_reason == KVM_EXIT_MMIO &&
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run->mmio.phys_addr == vcpu->vm->ucall_mmio_addr) {
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TEST_ASSERT(run->mmio.is_write && run->mmio.len == sizeof(uint64_t),
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"Unexpected ucall exit mmio address access");
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return (void *)(*((uint64_t *)run->mmio.data));
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}
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return NULL;
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}
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