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| author | Nicholas Piggin <npiggin@gmail.com> | 2021-05-28 19:07:28 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-06-10 22:12:12 +1000 |
| commit | 023c3c96ca4d196c09d554d5a98900406e4d7ecb (patch) | |
| tree | 53d93fe53359a1b362e5e479c85a0c44c35f0046 /arch/powerpc/kvm/book3s_xive.c | |
| parent | e2762743c6328dde14290cd58ddf2175b068ad80 (diff) | |
| download | linux-023c3c96ca4d196c09d554d5a98900406e4d7ecb.tar.bz2 | |
KVM: PPC: Book3S HV P9: implement kvmppc_xive_pull_vcpu in C
This is more symmetric with kvmppc_xive_push_vcpu, and has the advantage
that it runs with the MMU on.
The extra test added to the asm will go away with a future change.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210528090752.3542186-9-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/kvm/book3s_xive.c')
| -rw-r--r-- | arch/powerpc/kvm/book3s_xive.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/arch/powerpc/kvm/book3s_xive.c b/arch/powerpc/kvm/book3s_xive.c index e7219b6f5f9a..741bf1f4387a 100644 --- a/arch/powerpc/kvm/book3s_xive.c +++ b/arch/powerpc/kvm/book3s_xive.c @@ -128,6 +128,37 @@ void kvmppc_xive_push_vcpu(struct kvm_vcpu *vcpu) EXPORT_SYMBOL_GPL(kvmppc_xive_push_vcpu); /* + * Pull a vcpu's context from the XIVE on guest exit. + * This assumes we are in virtual mode (MMU on) + */ +void kvmppc_xive_pull_vcpu(struct kvm_vcpu *vcpu) +{ + void __iomem *tima = local_paca->kvm_hstate.xive_tima_virt; + + if (!vcpu->arch.xive_pushed) + return; + + /* + * Should not have been pushed if there is no tima + */ + if (WARN_ON(!tima)) + return; + + eieio(); + /* First load to pull the context, we ignore the value */ + __raw_readl(tima + TM_SPC_PULL_OS_CTX); + /* Second load to recover the context state (Words 0 and 1) */ + vcpu->arch.xive_saved_state.w01 = __raw_readq(tima + TM_QW1_OS); + + /* Fixup some of the state for the next load */ + vcpu->arch.xive_saved_state.lsmfb = 0; + vcpu->arch.xive_saved_state.ack = 0xff; + vcpu->arch.xive_pushed = 0; + eieio(); +} +EXPORT_SYMBOL_GPL(kvmppc_xive_pull_vcpu); + +/* * This is a simple trigger for a generic XIVE IRQ. This must * only be called for interrupts that support a trigger page */ |