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| author | Jordan Niethe <jniethe5@gmail.com> | 2023-12-01 16:26:09 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2023-12-07 15:33:07 +0300 |
| commit | e678748a8dca5b57041a84a66577f6168587b3f7 (patch) | |
| tree | f1c8e20ffd33fdf9a6f01c80121c7bc0da3b0774 /arch/powerpc/kvm | |
| parent | 63ccae78cd88b52fb1d598ae33fa8408ce067b30 (diff) | |
| download | linux-e678748a8dca5b57041a84a66577f6168587b3f7.tar.xz | |
KVM: PPC: Book3S HV nestedv2: Get the PID only if needed to copy tofrom a guest
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@gmail.com>
Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231201132618.555031-5-vaibhav@linux.ibm.com
Diffstat (limited to 'arch/powerpc/kvm')
| -rw-r--r-- | arch/powerpc/kvm/book3s_64_mmu_radix.c | 4 |
1 files changed, 3 insertions, 1 deletions
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); |