[PATCH v3 32/36] KVM: arm64: Extend pKVM page ownership selftests to cover guest donation

[Will Deacon]

Extend the pKVM page ownership selftests to donate and reclaim a page
to/from a guest.

Signed-off-by: Will Deacon <will at kernel.org>
---
 arch/arm64/kvm/hyp/nvhe/mem_protect.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/arch/arm64/kvm/hyp/nvhe/mem_protect.c b/arch/arm64/kvm/hyp/nvhe/mem_protect.c
index 4451955ac767..d13ea7b7e878 100644
--- a/arch/arm64/kvm/hyp/nvhe/mem_protect.c
+++ b/arch/arm64/kvm/hyp/nvhe/mem_protect.c
@@ -1749,6 +1749,7 @@ void pkvm_ownership_selftest(void *base)
 	assert_transition_res(-EPERM,	hyp_pin_shared_mem, virt, virt + size);
 	assert_transition_res(-EPERM,	__pkvm_host_share_guest, pfn, gfn, 1, vcpu, prot);
 	assert_transition_res(-ENOENT,	__pkvm_host_unshare_guest, gfn, 1, vm);
+	assert_transition_res(-EPERM,   __pkvm_host_donate_guest, pfn, gfn, vcpu);
 
 	selftest_state.host = PKVM_PAGE_OWNED;
 	selftest_state.hyp = PKVM_NOPAGE;
@@ -1768,6 +1769,7 @@ void pkvm_ownership_selftest(void *base)
 	assert_transition_res(-EPERM,	__pkvm_hyp_donate_host, pfn, 1);
 	assert_transition_res(-EPERM,	__pkvm_host_share_guest, pfn, gfn, 1, vcpu, prot);
 	assert_transition_res(-ENOENT,	__pkvm_host_unshare_guest, gfn, 1, vm);
+	assert_transition_res(-EPERM,   __pkvm_host_donate_guest, pfn, gfn, vcpu);
 
 	assert_transition_res(0,	hyp_pin_shared_mem, virt, virt + size);
 	assert_transition_res(0,	hyp_pin_shared_mem, virt, virt + size);
@@ -1780,6 +1782,7 @@ void pkvm_ownership_selftest(void *base)
 	assert_transition_res(-EPERM,	__pkvm_hyp_donate_host, pfn, 1);
 	assert_transition_res(-EPERM,	__pkvm_host_share_guest, pfn, gfn, 1, vcpu, prot);
 	assert_transition_res(-ENOENT,	__pkvm_host_unshare_guest, gfn, 1, vm);
+	assert_transition_res(-EPERM,   __pkvm_host_donate_guest, pfn, gfn, vcpu);
 
 	hyp_unpin_shared_mem(virt, virt + size);
 	assert_page_state();
@@ -1799,6 +1802,7 @@ void pkvm_ownership_selftest(void *base)
 	assert_transition_res(-EPERM,	__pkvm_hyp_donate_host, pfn, 1);
 	assert_transition_res(-EPERM,	__pkvm_host_share_guest, pfn, gfn, 1, vcpu, prot);
 	assert_transition_res(-ENOENT,	__pkvm_host_unshare_guest, gfn, 1, vm);
+	assert_transition_res(-EPERM,   __pkvm_host_donate_guest, pfn, gfn, vcpu);
 	assert_transition_res(-EPERM,	hyp_pin_shared_mem, virt, virt + size);
 
 	selftest_state.host = PKVM_PAGE_OWNED;
@@ -1815,6 +1819,7 @@ void pkvm_ownership_selftest(void *base)
 	assert_transition_res(-EPERM,	__pkvm_host_share_hyp, pfn);
 	assert_transition_res(-EPERM,	__pkvm_host_unshare_hyp, pfn);
 	assert_transition_res(-EPERM,	__pkvm_hyp_donate_host, pfn, 1);
+	assert_transition_res(-EPERM,   __pkvm_host_donate_guest, pfn, gfn, vcpu);
 	assert_transition_res(-EPERM,	hyp_pin_shared_mem, virt, virt + size);
 
 	selftest_state.guest[1] = PKVM_PAGE_SHARED_BORROWED;
@@ -1828,6 +1833,23 @@ void pkvm_ownership_selftest(void *base)
 	selftest_state.host = PKVM_PAGE_OWNED;
 	assert_transition_res(0,	__pkvm_host_unshare_guest, gfn + 1, 1, vm);
 
+	selftest_state.host = PKVM_NOPAGE;
+	selftest_state.guest[0] = PKVM_PAGE_OWNED;
+	assert_transition_res(0,	__pkvm_host_donate_guest, pfn, gfn, vcpu);
+	assert_transition_res(-EPERM,	__pkvm_host_donate_guest, pfn, gfn, vcpu);
+	assert_transition_res(-EPERM,	__pkvm_host_donate_guest, pfn, gfn + 1, vcpu);
+	assert_transition_res(-EPERM,	__pkvm_host_share_guest, pfn, gfn, 1, vcpu, prot);
+	assert_transition_res(-EPERM,	__pkvm_host_share_guest, pfn, gfn + 1, 1, vcpu, prot);
+	assert_transition_res(-EPERM,	__pkvm_host_share_ffa, pfn, 1);
+	assert_transition_res(-EPERM,	__pkvm_host_donate_hyp, pfn, 1);
+	assert_transition_res(-EPERM,	__pkvm_host_share_hyp, pfn);
+	assert_transition_res(-EPERM,	__pkvm_host_unshare_hyp, pfn);
+	assert_transition_res(-EPERM,	__pkvm_hyp_donate_host, pfn, 1);
+
+	selftest_state.host = PKVM_PAGE_OWNED;
+	selftest_state.guest[0] = PKVM_NOPAGE;
+	assert_transition_res(0,	__pkvm_host_reclaim_page_guest, gfn, vm);
+
 	selftest_state.host = PKVM_NOPAGE;
 	selftest_state.hyp = PKVM_PAGE_OWNED;
 	assert_transition_res(0,	__pkvm_host_donate_hyp, pfn, 1);
-- 
2.53.0.473.g4a7958ca14-goog