diff options
| author | Shenming Lu <lushenming@huawei.com> | 2020-11-28 15:18:57 +0100 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2020-11-30 12:18:29 +0100 |
| commit | 57e3cebd022fbc035dcf190ac789fd2ffc747f5b (patch) | |
| tree | a566c7a05f60d395cc47e072fdd8e1d600bb535e /drivers | |
| parent | KVM: arm64: Remove unused __extended_idmap_trampoline() prototype (diff) | |
| download | linux-57e3cebd022fbc035dcf190ac789fd2ffc747f5b.tar.xz linux-57e3cebd022fbc035dcf190ac789fd2ffc747f5b.zip | |
KVM: arm64: Delay the polling of the GICR_VPENDBASER.Dirty bit
In order to reduce the impact of the VPT parsing happening on the GIC,
we can split the vcpu reseidency in two phases:
- programming GICR_VPENDBASER: this still happens in vcpu_load()
- checking for the VPT parsing to be complete: this can happen
on vcpu entry (in kvm_vgic_flush_hwstate())
This allows the GIC and the CPU to work in parallel, rewmoving some
of the entry overhead.
Suggested-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Shenming Lu <lushenming@huawei.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20201128141857.983-3-lushenming@huawei.com
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/irqchip/irq-gic-v3-its.c | 12 | ||||
| -rw-r--r-- | drivers/irqchip/irq-gic-v4.c | 19 |
2 files changed, 27 insertions, 4 deletions
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index 0fec31931e11..7db602434ac5 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -3842,8 +3842,6 @@ static void its_vpe_schedule(struct its_vpe *vpe) val |= vpe->idai ? GICR_VPENDBASER_IDAI : 0; val |= GICR_VPENDBASER_Valid; gicr_write_vpendbaser(val, vlpi_base + GICR_VPENDBASER); - - its_wait_vpt_parse_complete(); } static void its_vpe_deschedule(struct its_vpe *vpe) @@ -3891,6 +3889,10 @@ static int its_vpe_set_vcpu_affinity(struct irq_data *d, void *vcpu_info) its_vpe_deschedule(vpe); return 0; + case COMMIT_VPE: + its_wait_vpt_parse_complete(); + return 0; + case INVALL_VPE: its_vpe_invall(vpe); return 0; @@ -4052,8 +4054,6 @@ static void its_vpe_4_1_schedule(struct its_vpe *vpe, val |= FIELD_PREP(GICR_VPENDBASER_4_1_VPEID, vpe->vpe_id); gicr_write_vpendbaser(val, vlpi_base + GICR_VPENDBASER); - - its_wait_vpt_parse_complete(); } static void its_vpe_4_1_deschedule(struct its_vpe *vpe, @@ -4128,6 +4128,10 @@ static int its_vpe_4_1_set_vcpu_affinity(struct irq_data *d, void *vcpu_info) its_vpe_4_1_deschedule(vpe, info); return 0; + case COMMIT_VPE: + its_wait_vpt_parse_complete(); + return 0; + case INVALL_VPE: its_vpe_4_1_invall(vpe); return 0; diff --git a/drivers/irqchip/irq-gic-v4.c b/drivers/irqchip/irq-gic-v4.c index 0c18714ae13e..5d1dc9915272 100644 --- a/drivers/irqchip/irq-gic-v4.c +++ b/drivers/irqchip/irq-gic-v4.c @@ -232,6 +232,8 @@ int its_make_vpe_non_resident(struct its_vpe *vpe, bool db) if (!ret) vpe->resident = false; + vpe->ready = false; + return ret; } @@ -258,6 +260,23 @@ int its_make_vpe_resident(struct its_vpe *vpe, bool g0en, bool g1en) return ret; } +int its_commit_vpe(struct its_vpe *vpe) +{ + struct its_cmd_info info = { + .cmd_type = COMMIT_VPE, + }; + int ret; + + WARN_ON(preemptible()); + + ret = its_send_vpe_cmd(vpe, &info); + if (!ret) + vpe->ready = true; + + return ret; +} + + int its_invall_vpe(struct its_vpe *vpe) { struct its_cmd_info info = { |