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KVM: selftests: Expose PTE masks to guests as part of an MMU

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Expose a guest_mmu to the guest to allow guest code to use the PTE masks
for page table manipulation. Since guest page tables are not mapped in
the guest by default, zero the PGD in guest_mmu in an attempt to make it
more difficult for new tests to shoot themselves in the foot and assume
that page tables can be immediately used by guest code.

Ultimately, guest code can read CR3 any way, so guest_mmu.pgd doesn't
add a lot of value.

Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Yosry Ahmed <yosry@kernel.org>
Link: https://patch.msgid.link/20260728174232.2423257-9-yosry@kernel.org
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Yosry Ahmed
2026-07-28 17:42:27 +00:00
committed by Sean Christopherson
parent 12f4d8b06a
commit e21d4dc0ca
2 changed files with 13 additions and 0 deletions
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1
tools/testing/selftests/kvm/include/x86/processor.h
View File

@@ -24,6 +24,7 @@ extern bool host_cpu_is_amd;
extern bool host_cpu_is_hygon;
extern bool host_cpu_is_amd_compatible;
extern u64 guest_tsc_khz;
extern struct kvm_mmu guest_mmu;
#ifndef MAX_NR_CPUID_ENTRIES
#define MAX_NR_CPUID_ENTRIES 100

12
tools/testing/selftests/kvm/lib/x86/processor.c
View File

@@ -28,6 +28,7 @@ bool host_cpu_is_hygon;
bool host_cpu_is_amd_compatible;
bool is_forced_emulation_enabled;
u64 guest_tsc_khz;
struct kvm_mmu guest_mmu;
struct guest_regs guest_regs;
@@ -831,6 +832,17 @@ void kvm_arch_vm_post_create(struct kvm_vm *vm, unsigned int nr_vcpus)
TEST_ASSERT(r > 0, "KVM_GET_TSC_KHZ did not provide a valid TSC frequency.");
guest_tsc_khz = r;
sync_global_to_guest(vm, guest_tsc_khz);
/*
* The guest MMU is just a placeholder to provide access to PTE masks
* (for now). The guest does not have mappings for its own page tables
* by default, so any meaningful use of guest page tables requires
* explicit setup by the test. Zero the PGD to make it obvious the guest
* page tables are not immediately usable by guest code.
*/
guest_mmu = vm->mmu;
guest_mmu.pgd = 0;
sync_global_to_guest(vm, guest_mmu);
}
void vcpu_arch_set_entry_point(struct kvm_vcpu *vcpu, void *guest_code)