mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git
synced 2026-04-23 05:56:14 -04:00
2afc1fbbda
MEM_REGION_TEST_DATA is meant to hold data explicitly used by a
selftest, not implicit allocations due to the selftests infrastructure.
Allocate the ucall pool from MEM_REGION_DATA much like the rest of the
selftests library allocations.
Fixes: 426729b2cf ("KVM: selftests: Add ucall pool based implementation")
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Message-Id: <20221207214809.489070-5-oliver.upton@linux.dev>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
104 lines
2.0 KiB
C
104 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#include "kvm_util.h"
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#include "linux/types.h"
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#include "linux/bitmap.h"
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#include "linux/atomic.h"
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struct ucall_header {
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DECLARE_BITMAP(in_use, KVM_MAX_VCPUS);
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struct ucall ucalls[KVM_MAX_VCPUS];
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};
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/*
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* ucall_pool holds per-VM values (global data is duplicated by each VM), it
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* must not be accessed from host code.
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*/
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static struct ucall_header *ucall_pool;
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void ucall_init(struct kvm_vm *vm, vm_paddr_t mmio_gpa)
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{
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struct ucall_header *hdr;
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struct ucall *uc;
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vm_vaddr_t vaddr;
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int i;
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vaddr = __vm_vaddr_alloc(vm, sizeof(*hdr), KVM_UTIL_MIN_VADDR, MEM_REGION_DATA);
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hdr = (struct ucall_header *)addr_gva2hva(vm, vaddr);
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memset(hdr, 0, sizeof(*hdr));
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for (i = 0; i < KVM_MAX_VCPUS; ++i) {
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uc = &hdr->ucalls[i];
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uc->hva = uc;
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}
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write_guest_global(vm, ucall_pool, (struct ucall_header *)vaddr);
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ucall_arch_init(vm, mmio_gpa);
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}
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static struct ucall *ucall_alloc(void)
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{
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struct ucall *uc;
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int i;
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GUEST_ASSERT(ucall_pool);
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for (i = 0; i < KVM_MAX_VCPUS; ++i) {
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if (!atomic_test_and_set_bit(i, ucall_pool->in_use)) {
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uc = &ucall_pool->ucalls[i];
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memset(uc->args, 0, sizeof(uc->args));
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return uc;
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}
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}
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GUEST_ASSERT(0);
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return NULL;
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}
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static void ucall_free(struct ucall *uc)
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{
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/* Beware, here be pointer arithmetic. */
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clear_bit(uc - ucall_pool->ucalls, ucall_pool->in_use);
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}
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void ucall(uint64_t cmd, int nargs, ...)
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{
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struct ucall *uc;
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va_list va;
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int i;
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uc = ucall_alloc();
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WRITE_ONCE(uc->cmd, cmd);
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nargs = min(nargs, UCALL_MAX_ARGS);
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va_start(va, nargs);
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for (i = 0; i < nargs; ++i)
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WRITE_ONCE(uc->args[i], va_arg(va, uint64_t));
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va_end(va);
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ucall_arch_do_ucall((vm_vaddr_t)uc->hva);
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ucall_free(uc);
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}
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uint64_t get_ucall(struct kvm_vcpu *vcpu, struct ucall *uc)
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{
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struct ucall ucall;
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void *addr;
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if (!uc)
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uc = &ucall;
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addr = ucall_arch_get_ucall(vcpu);
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if (addr) {
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memcpy(uc, addr, sizeof(*uc));
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vcpu_run_complete_io(vcpu);
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} else {
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memset(uc, 0, sizeof(*uc));
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}
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return uc->cmd;
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}
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