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KVM: s390: gaccess: Refactor gpa and length calculation

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[ Upstream commit 416e7f0c9d613bf84e182eba9547ae8f9f5bfa4c ]

Improve readability by renaming the length variable and
not calculating the offset manually.

Signed-off-by: Janis Schoetterl-Glausch <scgl@linux.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Message-Id: <20211126164549.7046-2-scgl@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Stable-dep-of: e8061f06185b ("KVM: s390: gaccess: Check if guest address is in memslot")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Janis Schoetterl-Glausch 2021-11-26 17:45:47 +01:00 • committed by Greg Kroah-Hartman
commit f1f3615bc3
1 changed files with 17 additions and 15 deletions
Download patch file Download diff file Expand all files Collapse all files

32
arch/s390/kvm/gaccess.c
View file

@ -831,8 +831,9 @@ int access_guest(struct kvm_vcpu *vcpu, unsigned long ga, u8 ar, void *data,
unsigned long len, enum gacc_mode mode)
{
psw_t *psw = &vcpu->arch.sie_block->gpsw;
unsigned long _len, nr_pages, gpa, idx;
unsigned long nr_pages, gpa, idx;
unsigned long pages_array[2];
unsigned int fragment_len;
unsigned long *pages;
int need_ipte_lock;
union asce asce;
@ -855,15 +856,15 @@ int access_guest(struct kvm_vcpu *vcpu, unsigned long ga, u8 ar, void *data,
ipte_lock(vcpu);
rc = guest_page_range(vcpu, ga, ar, pages, nr_pages, asce, mode);
for (idx = 0; idx < nr_pages && !rc; idx++) {
gpa = *(pages + idx) + (ga & ~PAGE_MASK);
_len = min(PAGE_SIZE - (gpa & ~PAGE_MASK), len);
gpa = pages[idx] + offset_in_page(ga);
fragment_len = min(PAGE_SIZE - offset_in_page(gpa), len);
if (mode == GACC_STORE)
rc = kvm_write_guest(vcpu->kvm, gpa, data, _len);
rc = kvm_write_guest(vcpu->kvm, gpa, data, fragment_len);
else
rc = kvm_read_guest(vcpu->kvm, gpa, data, _len);
len -= _len;
ga += _len;
data += _len;
rc = kvm_read_guest(vcpu->kvm, gpa, data, fragment_len);
len -= fragment_len;
ga += fragment_len;
data += fragment_len;
}
if (need_ipte_lock)
ipte_unlock(vcpu);
@ -875,19 +876,20 @@ int access_guest(struct kvm_vcpu *vcpu, unsigned long ga, u8 ar, void *data,
int access_guest_real(struct kvm_vcpu *vcpu, unsigned long gra,
void *data, unsigned long len, enum gacc_mode mode)
{
unsigned long _len, gpa;
unsigned int fragment_len;
unsigned long gpa;
int rc = 0;
while (len && !rc) {
gpa = kvm_s390_real_to_abs(vcpu, gra);
_len = min(PAGE_SIZE - (gpa & ~PAGE_MASK), len);
fragment_len = min(PAGE_SIZE - offset_in_page(gpa), len);
if (mode)
rc = write_guest_abs(vcpu, gpa, data, _len);
rc = write_guest_abs(vcpu, gpa, data, fragment_len);
else
rc = read_guest_abs(vcpu, gpa, data, _len);
len -= _len;
gra += _len;
data += _len;
rc = read_guest_abs(vcpu, gpa, data, fragment_len);
len -= fragment_len;
gra += fragment_len;
data += fragment_len;
}
return rc;
}