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KVM: Use gfn_to_pfn_cache's immutable "kvm" in kvm_gpc_check()

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Make kvm_gpc_check() use kvm instance cached in gfn_to_pfn_cache.

Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Michal Luczaj <mhal@rbox.co>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
This commit is contained in:
Michal Luczaj 2022-10-13 21:12:26 +00:00 committed by David Woodhouse
parent 8c82a0b3ba
commit e308c24a35
4 changed files with 11 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/kvm/x86.c
View File

@ -3035,7 +3035,7 @@ static void kvm_setup_guest_pvclock(struct kvm_vcpu *v,
unsigned long flags; unsigned long flags;
read_lock_irqsave(&gpc->lock, flags); read_lock_irqsave(&gpc->lock, flags);
while (!kvm_gpc_check(v->kvm, gpc, gpc->gpa, while (!kvm_gpc_check(gpc, gpc->gpa,
offset + sizeof(*guest_hv_clock))) { offset + sizeof(*guest_hv_clock))) {
read_unlock_irqrestore(&gpc->lock, flags); read_unlock_irqrestore(&gpc->lock, flags);

16
arch/x86/kvm/xen.c
View File

@ -272,7 +272,7 @@ static void kvm_xen_update_runstate_guest(struct kvm_vcpu *v, bool atomic)
* gfn_to_pfn caches that cover the region. * gfn_to_pfn caches that cover the region.
*/ */
read_lock_irqsave(&gpc1->lock, flags); read_lock_irqsave(&gpc1->lock, flags);
while (!kvm_gpc_check(v->kvm, gpc1, gpc1->gpa, user_len1)) { while (!kvm_gpc_check(gpc1, gpc1->gpa, user_len1)) {
read_unlock_irqrestore(&gpc1->lock, flags); read_unlock_irqrestore(&gpc1->lock, flags);
/* When invoked from kvm_sched_out() we cannot sleep */ /* When invoked from kvm_sched_out() we cannot sleep */
@ -308,7 +308,7 @@ static void kvm_xen_update_runstate_guest(struct kvm_vcpu *v, bool atomic)
*/ */
read_lock(&gpc2->lock); read_lock(&gpc2->lock);
if (!kvm_gpc_check(v->kvm, gpc2, gpc2->gpa, user_len2)) { if (!kvm_gpc_check(gpc2, gpc2->gpa, user_len2)) {
read_unlock(&gpc2->lock); read_unlock(&gpc2->lock);
read_unlock_irqrestore(&gpc1->lock, flags); read_unlock_irqrestore(&gpc1->lock, flags);
@ -488,8 +488,7 @@ void kvm_xen_inject_pending_events(struct kvm_vcpu *v)
* little more honest about it. * little more honest about it.
*/ */
read_lock_irqsave(&gpc->lock, flags); read_lock_irqsave(&gpc->lock, flags);
while (!kvm_gpc_check(v->kvm, gpc, gpc->gpa, while (!kvm_gpc_check(gpc, gpc->gpa, sizeof(struct vcpu_info))) {
sizeof(struct vcpu_info))) {
read_unlock_irqrestore(&gpc->lock, flags); read_unlock_irqrestore(&gpc->lock, flags);
if (kvm_gpc_refresh(v->kvm, gpc, gpc->gpa, if (kvm_gpc_refresh(v->kvm, gpc, gpc->gpa,
@ -553,8 +552,7 @@ int __kvm_xen_has_interrupt(struct kvm_vcpu *v)
sizeof_field(struct compat_vcpu_info, evtchn_upcall_pending)); sizeof_field(struct compat_vcpu_info, evtchn_upcall_pending));
read_lock_irqsave(&gpc->lock, flags); read_lock_irqsave(&gpc->lock, flags);
while (!kvm_gpc_check(v->kvm, gpc, gpc->gpa, while (!kvm_gpc_check(gpc, gpc->gpa, sizeof(struct vcpu_info))) {
sizeof(struct vcpu_info))) {
read_unlock_irqrestore(&gpc->lock, flags); read_unlock_irqrestore(&gpc->lock, flags);
/* /*
@ -1158,7 +1156,7 @@ static bool wait_pending_event(struct kvm_vcpu *vcpu, int nr_ports,
read_lock_irqsave(&gpc->lock, flags); read_lock_irqsave(&gpc->lock, flags);
idx = srcu_read_lock(&kvm->srcu); idx = srcu_read_lock(&kvm->srcu);
if (!kvm_gpc_check(kvm, gpc, gpc->gpa, PAGE_SIZE)) if (!kvm_gpc_check(gpc, gpc->gpa, PAGE_SIZE))
goto out_rcu; goto out_rcu;
ret = false; ret = false;
@ -1580,7 +1578,7 @@ int kvm_xen_set_evtchn_fast(struct kvm_xen_evtchn *xe, struct kvm *kvm)
idx = srcu_read_lock(&kvm->srcu); idx = srcu_read_lock(&kvm->srcu);
read_lock_irqsave(&gpc->lock, flags); read_lock_irqsave(&gpc->lock, flags);
if (!kvm_gpc_check(kvm, gpc, gpc->gpa, PAGE_SIZE)) if (!kvm_gpc_check(gpc, gpc->gpa, PAGE_SIZE))
goto out_rcu; goto out_rcu;
if (IS_ENABLED(CONFIG_64BIT) && kvm->arch.xen.long_mode) { if (IS_ENABLED(CONFIG_64BIT) && kvm->arch.xen.long_mode) {
@ -1614,7 +1612,7 @@ int kvm_xen_set_evtchn_fast(struct kvm_xen_evtchn *xe, struct kvm *kvm)
gpc = &vcpu->arch.xen.vcpu_info_cache; gpc = &vcpu->arch.xen.vcpu_info_cache;
read_lock_irqsave(&gpc->lock, flags); read_lock_irqsave(&gpc->lock, flags);
if (!kvm_gpc_check(kvm, gpc, gpc->gpa, sizeof(struct vcpu_info))) { if (!kvm_gpc_check(gpc, gpc->gpa, sizeof(struct vcpu_info))) {
/* /*
* Could not access the vcpu_info. Set the bit in-kernel * Could not access the vcpu_info. Set the bit in-kernel
* and prod the vCPU to deliver it for itself. * and prod the vCPU to deliver it for itself.

4
include/linux/kvm_host.h
View File

@ -1298,7 +1298,6 @@ int kvm_gpc_activate(struct gfn_to_pfn_cache *gpc, gpa_t gpa, unsigned long len)
/** /**
* kvm_gpc_check - check validity of a gfn_to_pfn_cache. * kvm_gpc_check - check validity of a gfn_to_pfn_cache.
* *
* @kvm: pointer to kvm instance.
* @gpc: struct gfn_to_pfn_cache object. * @gpc: struct gfn_to_pfn_cache object.
* @gpa: current guest physical address to map. * @gpa: current guest physical address to map.
* @len: sanity check; the range being access must fit a single page. * @len: sanity check; the range being access must fit a single page.
@ -1313,8 +1312,7 @@ int kvm_gpc_activate(struct gfn_to_pfn_cache *gpc, gpa_t gpa, unsigned long len)
* Callers in IN_GUEST_MODE may do so without locking, although they should * Callers in IN_GUEST_MODE may do so without locking, although they should
* still hold a read lock on kvm->scru for the memslot checks. * still hold a read lock on kvm->scru for the memslot checks.
*/ */
bool kvm_gpc_check(struct kvm *kvm, struct gfn_to_pfn_cache *gpc, gpa_t gpa, bool kvm_gpc_check(struct gfn_to_pfn_cache *gpc, gpa_t gpa, unsigned long len);
unsigned long len);
/** /**
* kvm_gpc_refresh - update a previously initialized cache. * kvm_gpc_refresh - update a previously initialized cache.

5
virt/kvm/pfncache.c
View File

@ -76,10 +76,9 @@ void gfn_to_pfn_cache_invalidate_start(struct kvm *kvm, unsigned long start,
} }
} }
bool kvm_gpc_check(struct kvm *kvm, struct gfn_to_pfn_cache *gpc, gpa_t gpa, bool kvm_gpc_check(struct gfn_to_pfn_cache *gpc, gpa_t gpa, unsigned long len)
unsigned long len)
{ {
struct kvm_memslots *slots = kvm_memslots(kvm); struct kvm_memslots *slots = kvm_memslots(gpc->kvm);
if (!gpc->active) if (!gpc->active)
return false; return false;