Add a union to provide hv_enlightenments side-by-side with the sw_reserved
bytes that Hyper-V's enlightenments overlay. Casting sw_reserved
everywhere is messy, confusing, and unnecessarily unsafe.
No functional change intended.
Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
---
arch/x86/include/asm/svm.h | 7 ++++++-
arch/x86/kvm/svm/nested.c | 9 ++++-----
arch/x86/kvm/svm/svm.h | 5 ++++-
arch/x86/kvm/svm/svm_onhyperv.c | 2 +-
arch/x86/kvm/svm/svm_onhyperv.h | 15 +++++++--------
tools/testing/selftests/kvm/include/x86_64/svm.h | 5 ++++-
.../selftests/kvm/x86_64/hyperv_svm_test.c | 3 +--
7 files changed, 27 insertions(+), 19 deletions(-)
diff --git a/arch/x86/include/asm/svm.h b/arch/x86/include/asm/svm.h
index 0361626841bc..6befed2b30a6 100644
--- a/arch/x86/include/asm/svm.h
+++ b/arch/x86/include/asm/svm.h
@@ -5,6 +5,8 @@
#include <uapi/asm/svm.h>
#include <uapi/asm/kvm.h>
+#include <asm/hyperv-tlfs.h>
+
/*
* 32-bit intercept words in the VMCB Control Area, starting
* at Byte offset 000h.
@@ -161,7 +163,10 @@ struct __attribute__ ((__packed__)) vmcb_control_area {
* Offset 0x3e0, 32 bytes reserved
* for use by hypervisor/software.
*/
- u8 reserved_sw[32];
+ union {
+ struct hv_enlightenments hv_enlightenments;
+ u8 reserved_sw[32];
+ };
};
diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
index 76dcc8a3e849..a6a87d9743ce 100644
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -201,8 +201,7 @@ void recalc_intercepts(struct vcpu_svm *svm)
*/
static bool nested_svm_vmrun_msrpm(struct vcpu_svm *svm)
{
- struct hv_enlightenments *hve =
- (struct hv_enlightenments *)svm->nested.ctl.reserved_sw;
+ struct hv_enlightenments *hve = &svm->nested.ctl.hv_enlightenments;
int i;
/*
@@ -391,8 +390,8 @@ void __nested_copy_vmcb_control_to_cache(struct kvm_vcpu *vcpu,
/* Hyper-V extensions (Enlightened VMCB) */
if (kvm_hv_hypercall_enabled(vcpu)) {
to->clean = from->clean;
- memcpy(to->reserved_sw, from->reserved_sw,
- sizeof(struct hv_enlightenments));
+ memcpy(&to->hv_enlightenments, &from->hv_enlightenments,
+ sizeof(to->hv_enlightenments));
}
}
@@ -1485,7 +1484,7 @@ static void nested_copy_vmcb_cache_to_control(struct vmcb_control_area *dst,
dst->virt_ext = from->virt_ext;
dst->pause_filter_count = from->pause_filter_count;
dst->pause_filter_thresh = from->pause_filter_thresh;
- /* 'clean' and 'reserved_sw' are not changed by KVM */
+ /* 'clean' and 'hv_enlightenments' are not changed by KVM */
}
static int svm_get_nested_state(struct kvm_vcpu *vcpu,
diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
index 6a7686bf6900..9eb2fc76732f 100644
--- a/arch/x86/kvm/svm/svm.h
+++ b/arch/x86/kvm/svm/svm.h
@@ -151,7 +151,10 @@ struct vmcb_ctrl_area_cached {
u64 nested_cr3;
u64 virt_ext;
u32 clean;
- u8 reserved_sw[32];
+ union {
+ struct hv_enlightenments hv_enlightenments;
+ u8 reserved_sw[32];
+ };
};
struct svm_nested_state {
diff --git a/arch/x86/kvm/svm/svm_onhyperv.c b/arch/x86/kvm/svm/svm_onhyperv.c
index 8cdc62c74a96..5d4036611a37 100644
--- a/arch/x86/kvm/svm/svm_onhyperv.c
+++ b/arch/x86/kvm/svm/svm_onhyperv.c
@@ -26,7 +26,7 @@ int svm_hv_enable_direct_tlbflush(struct kvm_vcpu *vcpu)
if (!*p_hv_pa_pg)
return -ENOMEM;
- hve = (struct hv_enlightenments *)to_svm(vcpu)->vmcb->control.reserved_sw;
+ hve = &to_svm(vcpu)->vmcb->control.hv_enlightenments;
hve->partition_assist_page = __pa(*p_hv_pa_pg);
hve->hv_vm_id = (unsigned long)vcpu->kvm;
diff --git a/arch/x86/kvm/svm/svm_onhyperv.h b/arch/x86/kvm/svm/svm_onhyperv.h
index 8d02654ad6f8..c8f8045305be 100644
--- a/arch/x86/kvm/svm/svm_onhyperv.h
+++ b/arch/x86/kvm/svm/svm_onhyperv.h
@@ -18,8 +18,10 @@ int svm_hv_enable_direct_tlbflush(struct kvm_vcpu *vcpu);
static inline void svm_hv_init_vmcb(struct vmcb *vmcb)
{
- struct hv_enlightenments *hve =
- (struct hv_enlightenments *)vmcb->control.reserved_sw;
+ struct hv_enlightenments *hve = &vmcb->control.hv_enlightenments;
+
+ BUILD_BUG_ON(sizeof(vmcb->control.hv_enlightenments) !=
+ sizeof(vmcb->control.reserved_sw));
if (npt_enabled &&
ms_hyperv.nested_features & HV_X64_NESTED_ENLIGHTENED_TLB)
@@ -61,18 +63,15 @@ static inline void svm_hv_vmcb_dirty_nested_enlightenments(
struct kvm_vcpu *vcpu)
{
struct vmcb *vmcb = to_svm(vcpu)->vmcb;
- struct hv_enlightenments *hve =
- (struct hv_enlightenments *)vmcb->control.reserved_sw;
+ struct hv_enlightenments *hve = &vmcb->control.hv_enlightenments;
if (hve->hv_enlightenments_control.msr_bitmap)
vmcb_mark_dirty(vmcb, VMCB_HV_NESTED_ENLIGHTENMENTS);
}
-static inline void svm_hv_update_vp_id(struct vmcb *vmcb,
- struct kvm_vcpu *vcpu)
+static inline void svm_hv_update_vp_id(struct vmcb *vmcb, struct kvm_vcpu *vcpu)
{
- struct hv_enlightenments *hve =
- (struct hv_enlightenments *)vmcb->control.reserved_sw;
+ struct hv_enlightenments *hve = &vmcb->control.hv_enlightenments;
u32 vp_index = kvm_hv_get_vpindex(vcpu);
if (hve->hv_vp_id != vp_index) {
diff --git a/tools/testing/selftests/kvm/include/x86_64/svm.h b/tools/testing/selftests/kvm/include/x86_64/svm.h
index 10b9d0d4e0ec..0c32549c6b64 100644
--- a/tools/testing/selftests/kvm/include/x86_64/svm.h
+++ b/tools/testing/selftests/kvm/include/x86_64/svm.h
@@ -123,7 +123,10 @@ struct __attribute__ ((__packed__)) vmcb_control_area {
* Offset 0x3e0, 32 bytes reserved
* for use by hypervisor/software.
*/
- u8 reserved_sw[32];
+ union {
+ struct hv_enlightenments hv_enlightenments;
+ u8 reserved_sw[32];
+ };
};
diff --git a/tools/testing/selftests/kvm/x86_64/hyperv_svm_test.c b/tools/testing/selftests/kvm/x86_64/hyperv_svm_test.c
index b366b197759f..81b204ee509a 100644
--- a/tools/testing/selftests/kvm/x86_64/hyperv_svm_test.c
+++ b/tools/testing/selftests/kvm/x86_64/hyperv_svm_test.c
@@ -46,8 +46,7 @@ static void __attribute__((__flatten__)) guest_code(struct svm_test_data *svm)
{
unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
struct vmcb *vmcb = svm->vmcb;
- struct hv_enlightenments *hve =
- (struct hv_enlightenments *)vmcb->control.reserved_sw;
+ struct hv_enlightenments *hve = &vmcb->control.hv_enlightenments;
GUEST_SYNC(1);
--
2.37.3.968.ga6b4b080e4-goog
