From: Wei Liu <wl@xen.org>
To: Xen Development List <xen-devel@lists.xenproject.org>
Cc: "Wei Liu" <liuwe@microsoft.com>, "Wei Liu" <wl@xen.org>,
"Paul Durrant" <paul@xen.org>,
"Andrew Cooper" <andrew.cooper3@citrix.com>,
"Michael Kelley" <mikelley@microsoft.com>,
"Roger Pau Monné" <roger.pau@citrix.com>
Subject: [Xen-devel] [PATCH v4 7/7] x86/hyperv: setup VP assist page
Date: Wed, 22 Jan 2020 20:23:43 +0000 [thread overview]
Message-ID: <20200122202343.5703-8-liuwe@microsoft.com> (raw)
In-Reply-To: <20200122202343.5703-1-liuwe@microsoft.com>
VP assist page is rather important as we need to toggle some bits in it
for efficient nested virtualisation.
Signed-off-by: Wei Liu <liuwe@microsoft.com>
---
v4:
1. Use private.h
2. Prevent leak
v3:
1. Use xenheap page
2. Drop set_vp_assist
v2:
1. Use HV_HYP_PAGE_SHIFT instead
---
xen/arch/x86/guest/hyperv/hyperv.c | 26 ++++++++++++++++++++++++++
xen/arch/x86/guest/hyperv/private.h | 1 +
2 files changed, 27 insertions(+)
diff --git a/xen/arch/x86/guest/hyperv/hyperv.c b/xen/arch/x86/guest/hyperv/hyperv.c
index 085e646dc6..89a8f316b2 100644
--- a/xen/arch/x86/guest/hyperv/hyperv.c
+++ b/xen/arch/x86/guest/hyperv/hyperv.c
@@ -32,6 +32,7 @@
struct ms_hyperv_info __read_mostly ms_hyperv;
DEFINE_PER_CPU_READ_MOSTLY(void *, hv_pcpu_input_arg);
DEFINE_PER_CPU_READ_MOSTLY(unsigned int, hv_vp_index);
+DEFINE_PER_CPU_READ_MOSTLY(void *, hv_vp_assist);
static uint64_t generate_guest_id(void)
{
@@ -142,15 +143,40 @@ static void setup_hypercall_pcpu_arg(void)
this_cpu(hv_vp_index) = vp_index_msr;
}
+static void setup_vp_assist(void)
+{
+ void *mapping;
+ uint64_t val;
+
+ mapping = this_cpu(hv_vp_assist);
+
+ if ( !mapping )
+ {
+ mapping = alloc_xenheap_page();
+ if ( !mapping )
+ panic("Failed to allocate vp_assist page for CPU%u\n",
+ smp_processor_id());
+
+ clear_page(mapping);
+ this_cpu(hv_vp_assist) = mapping;
+ }
+
+ val = (virt_to_mfn(mapping) << HV_HYP_PAGE_SHIFT)
+ | HV_X64_MSR_VP_ASSIST_PAGE_ENABLE;
+ wrmsrl(HV_X64_MSR_VP_ASSIST_PAGE, val);
+}
+
static void __init setup(void)
{
setup_hypercall_page();
setup_hypercall_pcpu_arg();
+ setup_vp_assist();
}
static void ap_setup(void)
{
setup_hypercall_pcpu_arg();
+ setup_vp_assist();
}
static const struct hypervisor_ops ops = {
diff --git a/xen/arch/x86/guest/hyperv/private.h b/xen/arch/x86/guest/hyperv/private.h
index da70990401..af419e9d4b 100644
--- a/xen/arch/x86/guest/hyperv/private.h
+++ b/xen/arch/x86/guest/hyperv/private.h
@@ -26,5 +26,6 @@
DECLARE_PER_CPU(void *, hv_pcpu_input_arg);
DECLARE_PER_CPU(unsigned int, hv_vp_index);
+DECLARE_PER_CPU(void *, hv_vp_assist);
#endif /* __XEN_HYPERV_PRIVIATE_H__ */
--
2.20.1
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next prev parent reply other threads:[~2020-01-22 20:24 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-22 20:23 [Xen-devel] [PATCH v4 0/7] More Hyper-V infrastructure Wei Liu
2020-01-22 20:23 ` [Xen-devel] [PATCH v4 1/7] x86: provide executable fixmap facility Wei Liu
2020-01-22 20:56 ` Andrew Cooper
2020-01-28 15:09 ` Wei Liu
2020-01-23 11:04 ` Jan Beulich
2020-01-28 15:15 ` Wei Liu
2020-01-28 15:38 ` Jan Beulich
2020-01-29 14:42 ` Wei Liu
2020-01-29 14:59 ` Jan Beulich
2020-01-29 16:37 ` Wei Liu
2020-01-22 20:23 ` [Xen-devel] [PATCH v4 2/7] x86/hyperv: setup hypercall page Wei Liu
2020-01-22 21:31 ` Andrew Cooper
2020-01-23 10:04 ` Jan Beulich
2020-01-28 15:19 ` Wei Liu
2020-01-23 1:35 ` Michael Kelley
2020-01-28 15:20 ` Wei Liu
2020-01-23 11:18 ` Jan Beulich
2020-01-23 15:20 ` Michael Kelley
2020-01-28 15:30 ` Wei Liu
2020-01-28 15:41 ` Jan Beulich
2020-01-22 20:23 ` [Xen-devel] [PATCH v4 3/7] x86/hyperv: provide Hyper-V hypercall functions Wei Liu
2020-01-22 21:57 ` Andrew Cooper
2020-01-23 10:13 ` Jan Beulich
2020-01-29 18:25 ` Wei Liu
2020-01-23 11:28 ` Jan Beulich
2020-01-29 18:37 ` Wei Liu
2020-01-30 8:12 ` Jan Beulich
2020-01-30 11:55 ` Wei Liu
2020-01-22 20:23 ` [Xen-devel] [PATCH v4 4/7] DO NOT APPLY: x86/hyperv: issue an hypercall Wei Liu
2020-01-22 20:23 ` [Xen-devel] [PATCH v4 5/7] x86/hyperv: provide percpu hypercall input page Wei Liu
2020-01-23 15:45 ` Jan Beulich
2020-01-28 15:50 ` Wei Liu
2020-01-28 16:15 ` Jan Beulich
2020-01-28 16:52 ` Wei Liu
2020-01-22 20:23 ` [Xen-devel] [PATCH v4 6/7] x86/hyperv: retrieve vp_index from Hyper-V Wei Liu
2020-01-23 15:48 ` Jan Beulich
2020-01-28 15:55 ` Wei Liu
2020-01-28 16:18 ` Jan Beulich
2020-01-28 16:33 ` Durrant, Paul
2020-01-28 16:53 ` Wei Liu
2020-01-28 17:01 ` Durrant, Paul
2020-01-22 20:23 ` Wei Liu [this message]
2020-01-22 22:05 ` [Xen-devel] [PATCH v4 7/7] x86/hyperv: setup VP assist page Andrew Cooper
2020-01-23 15:50 ` Jan Beulich
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