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authorNicholas Piggin <npiggin@gmail.com>2021-05-28 12:07:38 +0300
committerMichael Ellerman <mpe@ellerman.id.au>2021-06-10 15:12:14 +0300
commit68e3baaca8c56bbb336d2215f201f4047ce736e5 (patch)
tree2363569b49609226b82504608197db6a838ffce3 /arch/powerpc/kvm
parenta32ed1bb70723ec7a6c888b6c7071d516cca0e8f (diff)
downloadlinux-68e3baaca8c56bbb336d2215f201f4047ce736e5.tar.xz
KVM: PPC: Book3S HV P9: Move SPR loading after expiry time check
This is wasted work if the time limit is exceeded. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20210528090752.3542186-19-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/kvm')
-rw-r--r--arch/powerpc/kvm/book3s_hv_p9_entry.c36
1 files changed, 22 insertions, 14 deletions
diff --git a/arch/powerpc/kvm/book3s_hv_p9_entry.c b/arch/powerpc/kvm/book3s_hv_p9_entry.c
index 8a56141214c1..f24a12632b72 100644
--- a/arch/powerpc/kvm/book3s_hv_p9_entry.c
+++ b/arch/powerpc/kvm/book3s_hv_p9_entry.c
@@ -123,21 +123,16 @@ int kvmhv_vcpu_entry_p9(struct kvm_vcpu *vcpu, u64 time_limit, unsigned long lpc
u64 tb, purr, spurr;
u64 *exsave;
bool ri_set;
- unsigned long msr = mfmsr();
int trap;
- unsigned long host_hfscr = mfspr(SPRN_HFSCR);
- unsigned long host_ciabr = mfspr(SPRN_CIABR);
- unsigned long host_dawr0 = mfspr(SPRN_DAWR0);
- unsigned long host_dawrx0 = mfspr(SPRN_DAWRX0);
- unsigned long host_psscr = mfspr(SPRN_PSSCR);
- unsigned long host_pidr = mfspr(SPRN_PID);
- unsigned long host_dawr1 = 0;
- unsigned long host_dawrx1 = 0;
-
- if (cpu_has_feature(CPU_FTR_DAWR1)) {
- host_dawr1 = mfspr(SPRN_DAWR1);
- host_dawrx1 = mfspr(SPRN_DAWRX1);
- }
+ unsigned long msr;
+ unsigned long host_hfscr;
+ unsigned long host_ciabr;
+ unsigned long host_dawr0;
+ unsigned long host_dawrx0;
+ unsigned long host_psscr;
+ unsigned long host_pidr;
+ unsigned long host_dawr1;
+ unsigned long host_dawrx1;
hdec = time_limit - mftb();
if (hdec < 0)
@@ -154,6 +149,19 @@ int kvmhv_vcpu_entry_p9(struct kvm_vcpu *vcpu, u64 time_limit, unsigned long lpc
vc->tb_offset_applied = vc->tb_offset;
}
+ msr = mfmsr();
+
+ host_hfscr = mfspr(SPRN_HFSCR);
+ host_ciabr = mfspr(SPRN_CIABR);
+ host_dawr0 = mfspr(SPRN_DAWR0);
+ host_dawrx0 = mfspr(SPRN_DAWRX0);
+ host_psscr = mfspr(SPRN_PSSCR);
+ host_pidr = mfspr(SPRN_PID);
+ if (cpu_has_feature(CPU_FTR_DAWR1)) {
+ host_dawr1 = mfspr(SPRN_DAWR1);
+ host_dawrx1 = mfspr(SPRN_DAWRX1);
+ }
+
if (vc->pcr)
mtspr(SPRN_PCR, vc->pcr | PCR_MASK);
mtspr(SPRN_DPDES, vc->dpdes);