Thread (73 messages) 73 messages, 8 authors, 2023-10-09
STALE959d

[RFC PATCH v12 26/33] KVM: selftests: Add helpers to do KVM_HC_MAP_GPA_RANGE hypercalls (x86)

From: Sean Christopherson <seanjc@google.com>
Date: 2023-09-14 02:00:53
Also in: kvm, kvm-riscv, kvmarm, linux-fsdevel, linux-mips, linux-mm, linux-riscv, linux-security-module, linuxppc-dev, lkml
Subsystem: kernel selftest framework, kernel virtual machine (kvm), the rest · Maintainers: Shuah Khan, Paolo Bonzini, Linus Torvalds

From: Vishal Annapurve <redacted>

Add helpers for x86 guests to invoke the KVM_HC_MAP_GPA_RANGE hypercall,
which KVM will forward to userspace and thus can be used by tests to
coordinate private<=>shared conversions between host userspace code and
guest code.

Signed-off-by: Vishal Annapurve <redacted>
[sean: drop shared/private helpers (let tests specify flags)]
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 .../selftests/kvm/include/x86_64/processor.h      | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
diff --git a/tools/testing/selftests/kvm/include/x86_64/processor.h b/tools/testing/selftests/kvm/include/x86_64/processor.h
index 4fd042112526..1911c12d5bad 100644
--- a/tools/testing/selftests/kvm/include/x86_64/processor.h
+++ b/tools/testing/selftests/kvm/include/x86_64/processor.h
@@ -15,6 +15,7 @@
 #include <asm/msr-index.h>
 #include <asm/prctl.h>
 
+#include <linux/kvm_para.h>
 #include <linux/stringify.h>
 
 #include "../kvm_util.h"
@@ -1171,6 +1172,20 @@ uint64_t kvm_hypercall(uint64_t nr, uint64_t a0, uint64_t a1, uint64_t a2,
 uint64_t __xen_hypercall(uint64_t nr, uint64_t a0, void *a1);
 void xen_hypercall(uint64_t nr, uint64_t a0, void *a1);
 
+static inline uint64_t __kvm_hypercall_map_gpa_range(uint64_t gpa,
+						     uint64_t size, uint64_t flags)
+{
+	return kvm_hypercall(KVM_HC_MAP_GPA_RANGE, gpa, size >> PAGE_SHIFT, flags, 0);
+}
+
+static inline void kvm_hypercall_map_gpa_range(uint64_t gpa, uint64_t size,
+					       uint64_t flags)
+{
+	uint64_t ret = __kvm_hypercall_map_gpa_range(gpa, size, flags);
+
+	GUEST_ASSERT(!ret);
+}
+
 void __vm_xsave_require_permission(uint64_t xfeature, const char *name);
 
 #define vm_xsave_require_permission(xfeature)	\
-- 
2.42.0.283.g2d96d420d3-goog


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