From: Jordan Niethe <jniethe5@xxxxxxxxx>
kvmhv_copy_tofrom_guest_radix() gets the PID at the start of the
function. If pid is not used, then this is a wasteful H_GUEST_GET_STATE
hcall for nestedv2 hosts. Move the assignment to where pid will be used.
Suggested-by: Nicholas Piggin <npiggin@xxxxxxxxx>
Signed-off-by: Jordan Niethe <jniethe5@xxxxxxxxx>
---
arch/powerpc/kvm/book3s_64_mmu_radix.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/kvm/book3s_64_mmu_radix.c b/arch/powerpc/kvm/book3s_64_mmu_radix.c
index 175a8eb2681f..916af6c153a5 100644
--- a/arch/powerpc/kvm/book3s_64_mmu_radix.c
+++ b/arch/powerpc/kvm/book3s_64_mmu_radix.c
@@ -97,7 +97,7 @@ static long kvmhv_copy_tofrom_guest_radix(struct kvm_vcpu *vcpu, gva_t eaddr,
void *to, void *from, unsigned long n)
{
int lpid = vcpu->kvm->arch.lpid;
- int pid = kvmppc_get_pid(vcpu);
+ int pid;
/* This would cause a data segment intr so don't allow the access */
if (eaddr & (0x3FFUL << 52))
@@ -110,6 +110,8 @@ static long kvmhv_copy_tofrom_guest_radix(struct kvm_vcpu *vcpu, gva_t eaddr,
/* If accessing quadrant 3 then pid is expected to be 0 */
if (((eaddr >> 62) & 0x3) == 0x3)
pid = 0;
+ else
+ pid = kvmppc_get_pid(vcpu);
eaddr &= ~(0xFFFUL << 52);
--
2.42.0
