On Mon, Jan 07, 2019 at 07:43:21PM +0100, Cédric Le Goater wrote:
> Interrupt sources are simply created at the OPAL level and then
> MASKED. KVM only needs to know about their type: LSI or MSI.
This commit message isn't very illuminating.
>
> Signed-off-by: Cédric Le Goater <clg@xxxxxxxx>
> ---
> arch/powerpc/include/uapi/asm/kvm.h | 5 +
> arch/powerpc/kvm/book3s_xive_native.c | 98 +++++++++++++++++++
> .../powerpc/kvm/book3s_xive_native_template.c | 27 +++++
> 3 files changed, 130 insertions(+)
> create mode 100644 arch/powerpc/kvm/book3s_xive_native_template.c
>
> diff --git a/arch/powerpc/include/uapi/asm/kvm.h b/arch/powerpc/include/uapi/asm/kvm.h
> index 8b78b12aa118..6fc9660c5aec 100644
> --- a/arch/powerpc/include/uapi/asm/kvm.h
> +++ b/arch/powerpc/include/uapi/asm/kvm.h
> @@ -680,5 +680,10 @@ struct kvm_ppc_cpu_char {
> #define KVM_DEV_XIVE_GET_ESB_FD 1
> #define KVM_DEV_XIVE_GET_TIMA_FD 2
> #define KVM_DEV_XIVE_VC_BASE 3
> +#define KVM_DEV_XIVE_GRP_SOURCES 2 /* 64-bit source attributes */
> +
> +/* Layout of 64-bit XIVE source attribute values */
> +#define KVM_XIVE_LEVEL_SENSITIVE (1ULL << 0)
> +#define KVM_XIVE_LEVEL_ASSERTED (1ULL << 1)
>
> #endif /* __LINUX_KVM_POWERPC_H */
> diff --git a/arch/powerpc/kvm/book3s_xive_native.c b/arch/powerpc/kvm/book3s_xive_native.c
> index 29a62914de55..2518640d4a58 100644
> --- a/arch/powerpc/kvm/book3s_xive_native.c
> +++ b/arch/powerpc/kvm/book3s_xive_native.c
> @@ -31,6 +31,24 @@
>
> #include "book3s_xive.h"
>
> +/*
> + * We still instantiate them here because we use some of the
> + * generated utility functions as well in this file.
And this comment is downright cryptic.
> + */
> +#define XIVE_RUNTIME_CHECKS
> +#define X_PFX xive_vm_
> +#define X_STATIC static
> +#define X_STAT_PFX stat_vm_
> +#define __x_tima xive_tima
> +#define __x_eoi_page(xd) ((void __iomem *)((xd)->eoi_mmio))
> +#define __x_trig_page(xd) ((void __iomem *)((xd)->trig_mmio))
> +#define __x_writeb __raw_writeb
> +#define __x_readw __raw_readw
> +#define __x_readq __raw_readq
> +#define __x_writeq __raw_writeq
> +
> +#include "book3s_xive_native_template.c"
> +
> static void xive_native_cleanup_queue(struct kvm_vcpu *vcpu, int prio)
> {
> struct kvmppc_xive_vcpu *xc = vcpu->arch.xive_vcpu;
> @@ -305,6 +323,78 @@ static int kvmppc_xive_native_get_tima_fd(struct kvmppc_xive *xive, u64 addr)
> return put_user(ret, ubufp);
> }
>
> +static int kvmppc_xive_native_set_source(struct kvmppc_xive *xive, long irq,
> + u64 addr)
> +{
> + struct kvmppc_xive_src_block *sb;
> + struct kvmppc_xive_irq_state *state;
> + u64 __user *ubufp = (u64 __user *) addr;
> + u64 val;
> + u16 idx;
> +
> + pr_devel("%s irq=0x%lx\n", __func__, irq);
> +
> + if (irq < KVMPPC_XIVE_FIRST_IRQ || irq >= KVMPPC_XIVE_NR_IRQS)
> + return -ENOENT;
> +
> + sb = kvmppc_xive_find_source(xive, irq, &idx);
> + if (!sb) {
> + pr_debug("No source, creating source block...\n");
Doesn't this need to be protected by some lock?
> + sb = kvmppc_xive_create_src_block(xive, irq);
> + if (!sb) {
> + pr_err("Failed to create block...\n");
> + return -ENOMEM;
> + }
> + }
> + state = &sb->irq_state[idx];
> +
> + if (get_user(val, ubufp)) {
> + pr_err("fault getting user info !\n");
> + return -EFAULT;
> + }
> +
> + /*
> + * If the source doesn't already have an IPI, allocate
> + * one and get the corresponding data
> + */
> + if (!state->ipi_number) {
> + state->ipi_number = xive_native_alloc_irq();
> + if (state->ipi_number == 0) {
> + pr_err("Failed to allocate IRQ !\n");
> + return -ENOMEM;
> + }
Am I right in thinking this is the point at which a specific guest irq
number gets bound to a specific host irq number?
> + xive_native_populate_irq_data(state->ipi_number,
> + &state->ipi_data);
> + pr_debug("%s allocated hw_irq=0x%x for irq=0x%lx\n", __func__,
> + state->ipi_number, irq);
> + }
> +
> + arch_spin_lock(&sb->lock);
> +
> + /* Restore LSI state */
> + if (val & KVM_XIVE_LEVEL_SENSITIVE) {
> + state->lsi = true;
> + if (val & KVM_XIVE_LEVEL_ASSERTED)
> + state->asserted = true;
> + pr_devel(" LSI ! Asserted=%d\n", state->asserted);
> + }
> +
> + /* Mask IRQ to start with */
> + state->act_server = 0;
> + state->act_priority = MASKED;
> + xive_vm_esb_load(&state->ipi_data, XIVE_ESB_SET_PQ_01);
> + xive_native_configure_irq(state->ipi_number, 0, MASKED, 0);
> +
> + /* Increment the number of valid sources and mark this one valid */
> + if (!state->valid)
> + xive->src_count++;
> + state->valid = true;
> +
> + arch_spin_unlock(&sb->lock);
> +
> + return 0;
> +}
> +
> static int kvmppc_xive_native_set_attr(struct kvm_device *dev,
> struct kvm_device_attr *attr)
> {
> @@ -317,6 +407,9 @@ static int kvmppc_xive_native_set_attr(struct kvm_device *dev,
> return kvmppc_xive_native_set_vc_base(xive, attr->addr);
> }
> break;
> + case KVM_DEV_XIVE_GRP_SOURCES:
> + return kvmppc_xive_native_set_source(xive, attr->attr,
> + attr->addr);
> }
> return -ENXIO;
> }
> @@ -353,6 +446,11 @@ static int kvmppc_xive_native_has_attr(struct kvm_device *dev,
> return 0;
> }
> break;
> + case KVM_DEV_XIVE_GRP_SOURCES:
> + if (attr->attr >= KVMPPC_XIVE_FIRST_IRQ &&
> + attr->attr < KVMPPC_XIVE_NR_IRQS)
> + return 0;
> + break;
> }
> return -ENXIO;
> }
> diff --git a/arch/powerpc/kvm/book3s_xive_native_template.c b/arch/powerpc/kvm/book3s_xive_native_template.c
> new file mode 100644
> index 000000000000..e7260da4a596
> --- /dev/null
> +++ b/arch/powerpc/kvm/book3s_xive_native_template.c
> @@ -0,0 +1,27 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2017-2019, IBM Corporation.
> + */
> +
> +/* File to be included by other .c files */
> +
> +#define XGLUE(a, b) a##b
> +#define GLUE(a, b) XGLUE(a, b)
> +
> +/*
> + * TODO: introduce a common template file with the XIVE native layer
> + * and the XICS-on-XIVE glue for the utility functions
> + */
> +static u8 GLUE(X_PFX, esb_load)(struct xive_irq_data *xd, u32 offset)
> +{
> + u64 val;
> +
> + if (xd->flags & XIVE_IRQ_FLAG_SHIFT_BUG)
> + offset |= offset << 4;
> +
> + val = __x_readq(__x_eoi_page(xd) + offset);
> +#ifdef __LITTLE_ENDIAN__
> + val >>= 64-8;
> +#endif
> + return (u8)val;
> +}
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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