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kvm: selftest: pass in extra memory when create vm

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This information can be used to decide the size of the default memory
slot, which will need to cover the extra pages with page tables.

Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Peter Xu
2018-08-22 15:19:59 +08:00
committed by Paolo Bonzini
parent bc8eb2fe2e
commit aee41be593
7 changed files with 23 additions and 8 deletions
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18
tools/testing/selftests/kvm/lib/x86.c
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@@ -702,6 +702,9 @@ void vcpu_set_cpuid(struct kvm_vm *vm,
*
* Input Args:
* vcpuid - The id of the single VCPU to add to the VM.
* extra_mem_pages - The size of extra memories to add (this will
* decide how much extra space we will need to
* setup the page tables using mem slot 0)
* guest_code - The vCPU's entry point
*
* Output Args: None
@@ -709,12 +712,23 @@ void vcpu_set_cpuid(struct kvm_vm *vm,
* Return:
* Pointer to opaque structure that describes the created VM.
*/
struct kvm_vm *vm_create_default(uint32_t vcpuid, void *guest_code)
struct kvm_vm *vm_create_default(uint32_t vcpuid, uint64_t extra_mem_pages,
void *guest_code)
{
struct kvm_vm *vm;
/*
* For x86 the maximum page table size for a memory region
* will be when only 4K pages are used. In that case the
* total extra size for page tables (for extra N pages) will
* be: N/512+N/512^2+N/512^3+... which is definitely smaller
* than N/512*2.
*/
uint64_t extra_pg_pages = extra_mem_pages / 512 * 2;
/* Create VM */
vm = vm_create(VM_MODE_FLAT48PG, DEFAULT_GUEST_PHY_PAGES, O_RDWR);
vm = vm_create(VM_MODE_FLAT48PG,
DEFAULT_GUEST_PHY_PAGES + extra_pg_pages,
O_RDWR);
/* Setup guest code */
kvm_vm_elf_load(vm, program_invocation_name, 0, 0);