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// SPDX-License-Identifier: GPL-2.0
/*
* x86_64-specific extensions to memstress.c.
*
* Copyright (C) 2022, Google, Inc.
*/
#include <stdio.h>
#include <stdlib.h>
#include <linux/bitmap.h>
#include <linux/bitops.h>
#include "test_util.h"
#include "kvm_util.h"
#include "memstress.h"
#include "processor.h"
#include "vmx.h"
void memstress_l2_guest_code(uint64_t vcpu_id)
{
memstress_guest_code(vcpu_id);
vmcall();
}
extern char memstress_l2_guest_entry[];
__asm__(
"memstress_l2_guest_entry:"
" mov (%rsp), %rdi;"
" call memstress_l2_guest_code;"
" ud2;"
);
static void memstress_l1_guest_code(struct vmx_pages *vmx, uint64_t vcpu_id)
{
#define L2_GUEST_STACK_SIZE 64
unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
unsigned long *rsp;
GUEST_ASSERT(vmx->vmcs_gpa);
GUEST_ASSERT(prepare_for_vmx_operation(vmx));
GUEST_ASSERT(load_vmcs(vmx));
GUEST_ASSERT(ept_1g_pages_supported());
rsp = &l2_guest_stack[L2_GUEST_STACK_SIZE - 1];
*rsp = vcpu_id;
prepare_vmcs(vmx, memstress_l2_guest_entry, rsp);
GUEST_ASSERT(!vmlaunch());
GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL);
GUEST_DONE();
}
uint64_t memstress_nested_pages(int nr_vcpus)
{
/*
* 513 page tables is enough to identity-map 256 TiB of L2 with 1G
* pages and 4-level paging, plus a few pages per-vCPU for data
* structures such as the VMCS.
*/
return 513 + 10 * nr_vcpus;
}
void memstress_setup_ept(struct vmx_pages *vmx, struct kvm_vm *vm)
{
uint64_t start, end;
prepare_eptp(vmx, vm, 0);
/*
* Identity map the first 4G and the test region with 1G pages so that
* KVM can shadow the EPT12 with the maximum huge page size supported
* by the backing source.
*/
nested_identity_map_1g(vmx, vm, 0, 0x100000000ULL);
start = align_down(memstress_args.gpa, PG_SIZE_1G);
end = align_up(memstress_args.gpa + memstress_args.size, PG_SIZE_1G);
nested_identity_map_1g(vmx, vm, start, end - start);
}
void memstress_setup_nested(struct kvm_vm *vm, int nr_vcpus, struct kvm_vcpu *vcpus[])
{
struct vmx_pages *vmx, *vmx0 = NULL;
struct kvm_regs regs;
vm_vaddr_t vmx_gva;
int vcpu_id;
TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_VMX));
TEST_REQUIRE(kvm_cpu_has_ept());
for (vcpu_id = 0; vcpu_id < nr_vcpus; vcpu_id++) {
vmx = vcpu_alloc_vmx(vm, &vmx_gva);
if (vcpu_id == 0) {
memstress_setup_ept(vmx, vm);
vmx0 = vmx;
} else {
/* Share the same EPT table across all vCPUs. */
vmx->eptp = vmx0->eptp;
vmx->eptp_hva = vmx0->eptp_hva;
vmx->eptp_gpa = vmx0->eptp_gpa;
}
/*
* Override the vCPU to run memstress_l1_guest_code() which will
* bounce it into L2 before calling memstress_guest_code().
*/
vcpu_regs_get(vcpus[vcpu_id], ®s);
regs.rip = (unsigned long) memstress_l1_guest_code;
vcpu_regs_set(vcpus[vcpu_id], ®s);
vcpu_args_set(vcpus[vcpu_id], 2, vmx_gva, vcpu_id);
}
}
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