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

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Make kvm_gpc_refresh() use kvm instance cached in gfn_to_pfn_cache.

No functional change intended.

Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Michal Luczaj <mhal@rbox.co>
[sean: leave kvm_gpc_unmap() as-is]
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 21:12:28 +00:00 committed by David Woodhouse
parent 2a0b128a90
commit 0318f207d1
4 changed files with 12 additions and 17 deletions
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2
arch/x86/kvm/x86.c
View File

@ -3039,7 +3039,7 @@ static void kvm_setup_guest_pvclock(struct kvm_vcpu *v,
offset + sizeof(*guest_hv_clock))) {
read_unlock_irqrestore(&gpc->lock, flags);
if (kvm_gpc_refresh(v->kvm, gpc, gpc->gpa,
if (kvm_gpc_refresh(gpc, gpc->gpa,
offset + sizeof(*guest_hv_clock)))
return;

10
arch/x86/kvm/xen.c
View File

@ -279,7 +279,7 @@ static void kvm_xen_update_runstate_guest(struct kvm_vcpu *v, bool atomic)
if (atomic)
return;
if (kvm_gpc_refresh(v->kvm, gpc1, gpc1->gpa, user_len1))
if (kvm_gpc_refresh(gpc1, gpc1->gpa, user_len1))
return;
read_lock_irqsave(&gpc1->lock, flags);
@ -491,8 +491,7 @@ void kvm_xen_inject_pending_events(struct kvm_vcpu *v)
while (!kvm_gpc_check(gpc, gpc->gpa, sizeof(struct vcpu_info))) {
read_unlock_irqrestore(&gpc->lock, flags);
if (kvm_gpc_refresh(v->kvm, gpc, gpc->gpa,
sizeof(struct vcpu_info)))
if (kvm_gpc_refresh(gpc, gpc->gpa, sizeof(struct vcpu_info)))
return;
read_lock_irqsave(&gpc->lock, flags);
@ -566,8 +565,7 @@ int __kvm_xen_has_interrupt(struct kvm_vcpu *v)
if (in_atomic() || !task_is_running(current))
return 1;
if (kvm_gpc_refresh(v->kvm, gpc, gpc->gpa,
sizeof(struct vcpu_info))) {
if (kvm_gpc_refresh(gpc, gpc->gpa, sizeof(struct vcpu_info))) {
/*
* If this failed, userspace has screwed up the
* vcpu_info mapping. No interrupts for you.
@ -1710,7 +1708,7 @@ static int kvm_xen_set_evtchn(struct kvm_xen_evtchn *xe, struct kvm *kvm)
break;
idx = srcu_read_lock(&kvm->srcu);
rc = kvm_gpc_refresh(kvm, gpc, gpc->gpa, PAGE_SIZE);
rc = kvm_gpc_refresh(gpc, gpc->gpa, PAGE_SIZE);
srcu_read_unlock(&kvm->srcu, idx);
} while(!rc);

10
include/linux/kvm_host.h
View File

@ -1317,23 +1317,21 @@ bool kvm_gpc_check(struct gfn_to_pfn_cache *gpc, gpa_t gpa, unsigned long len);
/**
* kvm_gpc_refresh - update a previously initialized cache.
*
* @kvm: pointer to kvm instance.
* @gpc: struct gfn_to_pfn_cache object.
* @gpa: updated guest physical address to map.
* @len: sanity check; the range being access must fit a single page.
*
* @return: 0 for success.
* -EINVAL for a mapping which would cross a page boundary.
* -EFAULT for an untranslatable guest physical address.
* -EFAULT for an untranslatable guest physical address.
*
* This will attempt to refresh a gfn_to_pfn_cache. Note that a successful
* returm from this function does not mean the page can be immediately
* return from this function does not mean the page can be immediately
* accessed because it may have raced with an invalidation. Callers must
* still lock and check the cache status, as this function does not return
* with the lock still held to permit access.
*/
int kvm_gpc_refresh(struct kvm *kvm, struct gfn_to_pfn_cache *gpc, gpa_t gpa,
unsigned long len);
int kvm_gpc_refresh(struct gfn_to_pfn_cache *gpc, gpa_t gpa, unsigned long len);
/**
* kvm_gpc_unmap - temporarily unmap a gfn_to_pfn_cache.

7
virt/kvm/pfncache.c
View File

@ -237,10 +237,9 @@ out_error:
return -EFAULT;
}
int kvm_gpc_refresh(struct kvm *kvm, struct gfn_to_pfn_cache *gpc, gpa_t gpa,
unsigned long len)
int kvm_gpc_refresh(struct gfn_to_pfn_cache *gpc, gpa_t gpa, unsigned long len)
{
struct kvm_memslots *slots = kvm_memslots(kvm);
struct kvm_memslots *slots = kvm_memslots(gpc->kvm);
unsigned long page_offset = gpa & ~PAGE_MASK;
bool unmap_old = false;
unsigned long old_uhva;
@ -399,7 +398,7 @@ int kvm_gpc_activate(struct gfn_to_pfn_cache *gpc, gpa_t gpa, unsigned long len)
gpc->active = true;
write_unlock_irq(&gpc->lock);
}
return kvm_gpc_refresh(kvm, gpc, gpa, len);
return kvm_gpc_refresh(gpc, gpa, len);
}
EXPORT_SYMBOL_GPL(kvm_gpc_activate);