[PATCH v2 01/13] KVM: x86/mmu: Re-add const qualifier in kvm_tdp_mmu_zap_collapsible_sptes

Ben Gardon
2021-04-01T23:37:50Z

kvm_tdp_mmu_zap_collapsible_sptes unnecessarily removes the const
qualifier from its memlsot argument, leading to a compiler warning. Add
the const annotation and pass it to subsequent functions.

Signed-off-by: Ben Gardon <bgardon@google.com>
---
arch/x86/kvm/mmu/mmu.c | 10 +++++-----
arch/x86/kvm/mmu/mmu_internal.h | 5 +++--
arch/x86/kvm/mmu/tdp_mmu.c | 5 +++--
arch/x86/kvm/mmu/tdp_mmu.h | 3 ++-
include/linux/kvm_host.h | 2 +-
5 files changed, 14 insertions(+), 11 deletions(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index efb41f31e80a..617809529987 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -715,8 +715,7 @@ static void kvm_mmu_page_set_gfn(struct kvm_mmu_page *sp, int index, gfn_t gfn)
* handling slots that are not large page aligned.
*/
static struct kvm_lpage_info *lpage_info_slot(gfn_t gfn,
- struct kvm_memory_slot *slot,
- int level)
+ const struct kvm_memory_slot *slot, int level)
{
unsigned long idx;

@@ -2735,7 +2734,7 @@ static void direct_pte_prefetch(struct kvm_vcpu *vcpu, u64 *sptep)
}

static int host_pfn_mapping_level(struct kvm *kvm, gfn_t gfn, kvm_pfn_t pfn,
- struct kvm_memory_slot *slot)
+ const struct kvm_memory_slot *slot)
{
unsigned long hva;
pte_t *pte;
@@ -2761,8 +2760,9 @@ static int host_pfn_mapping_level(struct kvm *kvm, gfn_t gfn, kvm_pfn_t pfn,
return level;
}

-int kvm_mmu_max_mapping_level(struct kvm *kvm, struct kvm_memory_slot *slot,
- gfn_t gfn, kvm_pfn_t pfn, int max_level)
+int kvm_mmu_max_mapping_level(struct kvm *kvm,
+ const struct kvm_memory_slot *slot, gfn_t gfn,
+ kvm_pfn_t pfn, int max_level)
{
struct kvm_lpage_info *linfo;

diff --git a/arch/x86/kvm/mmu/mmu_internal.h b/arch/x86/kvm/mmu/mmu_internal.h
index cead1d81e663..d44fe8a43a19 100644
--- a/arch/x86/kvm/mmu/mmu_internal.h
+++ b/arch/x86/kvm/mmu/mmu_internal.h
@@ -161,8 +161,9 @@ enum {
#define SET_SPTE_NEED_REMOTE_TLB_FLUSH BIT(1)
#define SET_SPTE_SPURIOUS BIT(2)

-int kvm_mmu_max_mapping_level(struct kvm *kvm, struct kvm_memory_slot *slot,
- gfn_t gfn, kvm_pfn_t pfn, int max_level);
+int kvm_mmu_max_mapping_level(struct kvm *kvm,
+ const struct kvm_memory_slot *slot, gfn_t gfn,
+ kvm_pfn_t pfn, int max_level);
int kvm_mmu_hugepage_adjust(struct kvm_vcpu *vcpu, gfn_t gfn,
int max_level, kvm_pfn_t *pfnp,
bool huge_page_disallowed, int *req_level);
diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
index ccf0d774a181..d5210a212c59 100644
--- a/arch/x86/kvm/mmu/tdp_mmu.c
+++ b/arch/x86/kvm/mmu/tdp_mmu.c
@@ -1255,7 +1255,7 @@ void kvm_tdp_mmu_clear_dirty_pt_masked(struct kvm *kvm,
*/
static bool zap_collapsible_spte_range(struct kvm *kvm,
struct kvm_mmu_page *root,
- struct kvm_memory_slot *slot,
+ const struct kvm_memory_slot *slot,
bool flush)
{
gfn_t start = slot->base_gfn;
@@ -1296,7 +1296,8 @@ static bool zap_collapsible_spte_range(struct kvm *kvm,
* be replaced by large mappings, for GFNs within the slot.
*/
bool kvm_tdp_mmu_zap_collapsible_sptes(struct kvm *kvm,
- struct kvm_memory_slot *slot, bool flush)
+ const struct kvm_memory_slot *slot,
+ bool flush)
{
struct kvm_mmu_page *root;

diff --git a/arch/x86/kvm/mmu/tdp_mmu.h b/arch/x86/kvm/mmu/tdp_mmu.h
index bf3ce169122e..d7007480b3d2 100644
--- a/arch/x86/kvm/mmu/tdp_mmu.h
+++ b/arch/x86/kvm/mmu/tdp_mmu.h
@@ -57,7 +57,8 @@ void kvm_tdp_mmu_clear_dirty_pt_masked(struct kvm *kvm,
gfn_t gfn, unsigned long mask,
bool wrprot);
bool kvm_tdp_mmu_zap_collapsible_sptes(struct kvm *kvm,
- struct kvm_memory_slot *slot, bool flush);
+ const struct kvm_memory_slot *slot,
+ bool flush);

bool kvm_tdp_mmu_write_protect_gfn(struct kvm *kvm,
struct kvm_memory_slot *slot, gfn_t gfn);
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index e6d77353025c..5e0d17b1ac2b 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1124,7 +1124,7 @@ __gfn_to_memslot(struct kvm_memslots *slots, gfn_t gfn)
}

static inline unsigned long
-__gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
+__gfn_to_hva_memslot(const struct kvm_memory_slot *slot, gfn_t gfn)
{
return slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE;
}
--
2.31.0.208.g409f899ff0-goog