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authorPaolo Bonzini <pbonzini@redhat.com>2024-05-10 10:49:02 -0400
committerPaolo Bonzini <pbonzini@redhat.com>2024-05-10 13:20:18 -0400
commit4232da23d75d173195c6766729e51947b64f83cd (patch)
tree7eb1420b118d452c0b497bf6267ecdfb0a6d5931 /virt
parentbbe10a5cc0c775e52e91c8b3b6547b59b2054f44 (diff)
parent7b7e584f90bf670d5c6f2b1fff884bf3b972cad4 (diff)
Merge tag 'loongarch-kvm-6.10' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson into HEAD
LoongArch KVM changes for v6.10 1. Add ParaVirt IPI support. 2. Add software breakpoint support. 3. Add mmio trace events support.
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/kvm_main.c3
-rw-r--r--virt/kvm/kvm_mm.h6
-rw-r--r--virt/kvm/pfncache.c50
3 files changed, 38 insertions, 21 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 38b498669ef9..38694f95bb56 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -798,8 +798,7 @@ static int kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
* mn_active_invalidate_count (see above) instead of
* mmu_invalidate_in_progress.
*/
- gfn_to_pfn_cache_invalidate_start(kvm, range->start, range->end,
- hva_range.may_block);
+ gfn_to_pfn_cache_invalidate_start(kvm, range->start, range->end);
/*
* If one or more memslots were found and thus zapped, notify arch code
diff --git a/virt/kvm/kvm_mm.h b/virt/kvm/kvm_mm.h
index ecefc7ec51af..715f19669d01 100644
--- a/virt/kvm/kvm_mm.h
+++ b/virt/kvm/kvm_mm.h
@@ -26,13 +26,11 @@ kvm_pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool interruptible,
#ifdef CONFIG_HAVE_KVM_PFNCACHE
void gfn_to_pfn_cache_invalidate_start(struct kvm *kvm,
unsigned long start,
- unsigned long end,
- bool may_block);
+ unsigned long end);
#else
static inline void gfn_to_pfn_cache_invalidate_start(struct kvm *kvm,
unsigned long start,
- unsigned long end,
- bool may_block)
+ unsigned long end)
{
}
#endif /* HAVE_KVM_PFNCACHE */
diff --git a/virt/kvm/pfncache.c b/virt/kvm/pfncache.c
index 4e07112a24c2..e3453e869e92 100644
--- a/virt/kvm/pfncache.c
+++ b/virt/kvm/pfncache.c
@@ -23,7 +23,7 @@
* MMU notifier 'invalidate_range_start' hook.
*/
void gfn_to_pfn_cache_invalidate_start(struct kvm *kvm, unsigned long start,
- unsigned long end, bool may_block)
+ unsigned long end)
{
struct gfn_to_pfn_cache *gpc;
@@ -57,6 +57,19 @@ void gfn_to_pfn_cache_invalidate_start(struct kvm *kvm, unsigned long start,
spin_unlock(&kvm->gpc_lock);
}
+static bool kvm_gpc_is_valid_len(gpa_t gpa, unsigned long uhva,
+ unsigned long len)
+{
+ unsigned long offset = kvm_is_error_gpa(gpa) ? offset_in_page(uhva) :
+ offset_in_page(gpa);
+
+ /*
+ * The cached access must fit within a single page. The 'len' argument
+ * to activate() and refresh() exists only to enforce that.
+ */
+ return offset + len <= PAGE_SIZE;
+}
+
bool kvm_gpc_check(struct gfn_to_pfn_cache *gpc, unsigned long len)
{
struct kvm_memslots *slots = kvm_memslots(gpc->kvm);
@@ -74,7 +87,7 @@ bool kvm_gpc_check(struct gfn_to_pfn_cache *gpc, unsigned long len)
if (kvm_is_error_hva(gpc->uhva))
return false;
- if (offset_in_page(gpc->uhva) + len > PAGE_SIZE)
+ if (!kvm_gpc_is_valid_len(gpc->gpa, gpc->uhva, len))
return false;
if (!gpc->valid)
@@ -232,8 +245,7 @@ out_error:
return -EFAULT;
}
-static int __kvm_gpc_refresh(struct gfn_to_pfn_cache *gpc, gpa_t gpa, unsigned long uhva,
- unsigned long len)
+static int __kvm_gpc_refresh(struct gfn_to_pfn_cache *gpc, gpa_t gpa, unsigned long uhva)
{
unsigned long page_offset;
bool unmap_old = false;
@@ -247,15 +259,6 @@ static int __kvm_gpc_refresh(struct gfn_to_pfn_cache *gpc, gpa_t gpa, unsigned l
if (WARN_ON_ONCE(kvm_is_error_gpa(gpa) == kvm_is_error_hva(uhva)))
return -EINVAL;
- /*
- * The cached acces must fit within a single page. The 'len' argument
- * exists only to enforce that.
- */
- page_offset = kvm_is_error_gpa(gpa) ? offset_in_page(uhva) :
- offset_in_page(gpa);
- if (page_offset + len > PAGE_SIZE)
- return -EINVAL;
-
lockdep_assert_held(&gpc->refresh_lock);
write_lock_irq(&gpc->lock);
@@ -270,6 +273,8 @@ static int __kvm_gpc_refresh(struct gfn_to_pfn_cache *gpc, gpa_t gpa, unsigned l
old_uhva = PAGE_ALIGN_DOWN(gpc->uhva);
if (kvm_is_error_gpa(gpa)) {
+ page_offset = offset_in_page(uhva);
+
gpc->gpa = INVALID_GPA;
gpc->memslot = NULL;
gpc->uhva = PAGE_ALIGN_DOWN(uhva);
@@ -279,6 +284,8 @@ static int __kvm_gpc_refresh(struct gfn_to_pfn_cache *gpc, gpa_t gpa, unsigned l
} else {
struct kvm_memslots *slots = kvm_memslots(gpc->kvm);
+ page_offset = offset_in_page(gpa);
+
if (gpc->gpa != gpa || gpc->generation != slots->generation ||
kvm_is_error_hva(gpc->uhva)) {
gfn_t gfn = gpa_to_gfn(gpa);
@@ -354,6 +361,9 @@ int kvm_gpc_refresh(struct gfn_to_pfn_cache *gpc, unsigned long len)
guard(mutex)(&gpc->refresh_lock);
+ if (!kvm_gpc_is_valid_len(gpc->gpa, gpc->uhva, len))
+ return -EINVAL;
+
/*
* If the GPA is valid then ignore the HVA, as a cache can be GPA-based
* or HVA-based, not both. For GPA-based caches, the HVA will be
@@ -361,7 +371,7 @@ int kvm_gpc_refresh(struct gfn_to_pfn_cache *gpc, unsigned long len)
*/
uhva = kvm_is_error_gpa(gpc->gpa) ? gpc->uhva : KVM_HVA_ERR_BAD;
- return __kvm_gpc_refresh(gpc, gpc->gpa, uhva, len);
+ return __kvm_gpc_refresh(gpc, gpc->gpa, uhva);
}
void kvm_gpc_init(struct gfn_to_pfn_cache *gpc, struct kvm *kvm)
@@ -381,6 +391,9 @@ static int __kvm_gpc_activate(struct gfn_to_pfn_cache *gpc, gpa_t gpa, unsigned
{
struct kvm *kvm = gpc->kvm;
+ if (!kvm_gpc_is_valid_len(gpa, uhva, len))
+ return -EINVAL;
+
guard(mutex)(&gpc->refresh_lock);
if (!gpc->active) {
@@ -400,11 +413,18 @@ static int __kvm_gpc_activate(struct gfn_to_pfn_cache *gpc, gpa_t gpa, unsigned
gpc->active = true;
write_unlock_irq(&gpc->lock);
}
- return __kvm_gpc_refresh(gpc, gpa, uhva, len);
+ return __kvm_gpc_refresh(gpc, gpa, uhva);
}
int kvm_gpc_activate(struct gfn_to_pfn_cache *gpc, gpa_t gpa, unsigned long len)
{
+ /*
+ * Explicitly disallow INVALID_GPA so that the magic value can be used
+ * by KVM to differentiate between GPA-based and HVA-based caches.
+ */
+ if (WARN_ON_ONCE(kvm_is_error_gpa(gpa)))
+ return -EINVAL;
+
return __kvm_gpc_activate(gpc, gpa, KVM_HVA_ERR_BAD, len);
}