From: Paul Durrant <paul@xen.org>
To: xen-devel@lists.xenproject.org
Cc: "Paul Durrant" <pdurrant@amazon.com>, "Wei Liu" <wl@xen.org>,
"Jan Beulich" <jbeulich@suse.com>,
"Andrew Cooper" <andrew.cooper3@citrix.com>,
"Roger Pau Monné" <roger.pau@citrix.com>
Subject: [PATCH v2 05/12] viridian: use hypercall_vpmask in hvcall_ipi()
Date: Fri, 20 Nov 2020 09:48:53 +0000 [thread overview]
Message-ID: <20201120094900.1489-6-paul@xen.org> (raw)
In-Reply-To: <20201120094900.1489-1-paul@xen.org>
From: Paul Durrant <pdurrant@amazon.com>
A subsequent patch will need to IPI a mask of virtual processors potentially
wider than 64 bits. A previous patch introduced per-cpu hypercall_vpmask
to allow hvcall_flush() to deal with such wide masks. This patch modifies
the implementation of hvcall_ipi() to make use of the same mask structures,
introducing a for_each_vp() macro to facilitate traversing a mask.
Signed-off-by: Paul Durrant <pdurrant@amazon.com>
---
Cc: Wei Liu <wl@xen.org>
Cc: Jan Beulich <jbeulich@suse.com>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: "Roger Pau Monné" <roger.pau@citrix.com>
v2:
- Drop the 'vp' loop now that vpmask_set() will do it internally
---
xen/arch/x86/hvm/viridian/viridian.c | 43 +++++++++++++++++++++-------
1 file changed, 32 insertions(+), 11 deletions(-)
diff --git a/xen/arch/x86/hvm/viridian/viridian.c b/xen/arch/x86/hvm/viridian/viridian.c
index 334d8527ff59..d8d8ecc89c80 100644
--- a/xen/arch/x86/hvm/viridian/viridian.c
+++ b/xen/arch/x86/hvm/viridian/viridian.c
@@ -551,6 +551,25 @@ static bool vpmask_test(const struct hypercall_vpmask *vpmask,
return test_bit(vp, vpmask->mask);
}
+static unsigned int vpmask_first(struct hypercall_vpmask *vpmask)
+{
+ return find_first_bit(vpmask->mask, HVM_MAX_VCPUS);
+}
+
+static unsigned int vpmask_next(struct hypercall_vpmask *vpmask, unsigned int vp)
+{
+ /*
+ * If vp + 1 > HVM_MAX_VCPUS then find_next_bit() will return
+ * HVM_MAX_VCPUS, ensuring the for_each_vp ( ... ) loop terminates.
+ */
+ return find_next_bit(vpmask->mask, HVM_MAX_VCPUS, vp + 1);
+}
+
+#define for_each_vp(vpmask, vp) \
+ for ( (vp) = vpmask_first(vpmask); \
+ (vp) < HVM_MAX_VCPUS; \
+ (vp) = vpmask_next(vpmask, vp) )
+
/*
* Windows should not issue the hypercalls requiring this callback in the
* case where vcpu_id would exceed the size of the mask.
@@ -631,13 +650,21 @@ static int hvcall_flush(union hypercall_input *input,
return 0;
}
+static void send_ipi(struct hypercall_vpmask *vpmask, uint8_t vector)
+{
+ struct domain *currd = current->domain;
+ unsigned int vp;
+
+ for_each_vp ( vpmask, vp )
+ vlapic_set_irq(vcpu_vlapic(currd->vcpu[vp]), vector, 0);
+}
+
static int hvcall_ipi(union hypercall_input *input,
union hypercall_output *output,
unsigned long input_params_gpa,
unsigned long output_params_gpa)
{
- struct domain *currd = current->domain;
- struct vcpu *v;
+ struct hypercall_vpmask *vpmask = &this_cpu(hypercall_vpmask);
uint32_t vector;
uint64_t vcpu_mask;
@@ -676,16 +703,10 @@ static int hvcall_ipi(union hypercall_input *input,
if ( vector < 0x10 || vector > 0xff )
return -EINVAL;
- for_each_vcpu ( currd, v )
- {
- if ( v->vcpu_id >= (sizeof(vcpu_mask) * 8) )
- return -EINVAL;
+ vpmask_empty(vpmask);
+ vpmask_set(vpmask, 0, vcpu_mask);
- if ( !(vcpu_mask & (1ul << v->vcpu_id)) )
- continue;
-
- vlapic_set_irq(vcpu_vlapic(v), vector, 0);
- }
+ send_ipi(vpmask, vector);
return 0;
}
--
2.20.1
next prev parent reply other threads:[~2020-11-20 9:49 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-20 9:48 [PATCH v2 00/12] viridian: add support for ExProcessorMasks Paul Durrant
2020-11-20 9:48 ` [PATCH v2 01/12] viridian: don't blindly write to 32-bit registers is 'mode' is invalid Paul Durrant
2020-11-20 14:20 ` Jan Beulich
2020-11-20 14:25 ` Durrant, Paul
2020-11-20 9:48 ` [PATCH v2 02/12] viridian: move flush hypercall implementation into separate function Paul Durrant
2020-11-20 9:48 ` [PATCH v2 03/12] viridian: move IPI " Paul Durrant
2020-11-20 9:48 ` [PATCH v2 04/12] viridian: introduce a per-cpu hypercall_vpmask and accessor functions Paul Durrant
2020-11-20 9:48 ` Paul Durrant [this message]
2020-11-20 15:09 ` [PATCH v2 05/12] viridian: use hypercall_vpmask in hvcall_ipi() Jan Beulich
2020-11-20 15:12 ` Durrant, Paul
2020-11-20 9:48 ` [PATCH v2 06/12] viridian: use softirq batching " Paul Durrant
2020-11-20 15:11 ` Jan Beulich
2020-11-20 9:48 ` [PATCH v2 07/12] xen/include: import sizeof_field() macro from Linux stddef.h Paul Durrant
2020-11-20 15:15 ` Jan Beulich
2020-11-20 15:24 ` Paul Durrant
2020-11-20 9:48 ` [PATCH v2 08/12] viridian: add ExProcessorMasks variants of the flush hypercalls Paul Durrant
2020-11-24 16:55 ` Jan Beulich
2020-11-24 18:40 ` Paul Durrant
2020-11-20 9:48 ` [PATCH v2 09/12] viridian: add ExProcessorMasks variant of the IPI hypercall Paul Durrant
2020-11-24 16:58 ` Jan Beulich
2020-11-20 9:48 ` [PATCH v2 10/12] viridian: log initial invocation of each type of hypercall Paul Durrant
2020-11-20 9:48 ` [PATCH v2 11/12] viridian: add a new '_HVMPV_ex_processor_masks' bit into HVM_PARAM_VIRIDIAN Paul Durrant
2020-11-20 9:49 ` [PATCH v2 12/12] xl / libxl: add 'ex_processor_mask' into 'libxl_viridian_enlightenment' Paul Durrant
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