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x86/hyper-v: allocate and use Virtual Processor Assist Pages

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Virtual Processor Assist Pages usage allows us to do optimized EOI
processing for APIC, enable Enlightened VMCS support in KVM and more.
struct hv_vp_assist_page is defined according to the Hyper-V TLFS v5.0b.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
This commit is contained in:
Vitaly Kuznetsov
2018-03-20 15:02:08 +01:00
committed by Radim Krčmář
parent d4abc577bb
commit a46d15cc1a
3 changed files with 66 additions and 3 deletions
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43
arch/x86/hyperv/hv_init.c
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@@ -88,11 +88,15 @@ EXPORT_SYMBOL_GPL(hyperv_cs);
u32 *hv_vp_index;
EXPORT_SYMBOL_GPL(hv_vp_index);
struct hv_vp_assist_page **hv_vp_assist_page;
EXPORT_SYMBOL_GPL(hv_vp_assist_page);
u32 hv_max_vp_index;
static int hv_cpu_init(unsigned int cpu)
{
u64 msr_vp_index;
struct hv_vp_assist_page **hvp = &hv_vp_assist_page[smp_processor_id()];
hv_get_vp_index(msr_vp_index);
@@ -101,6 +105,22 @@ static int hv_cpu_init(unsigned int cpu)
if (msr_vp_index > hv_max_vp_index)
hv_max_vp_index = msr_vp_index;
if (!hv_vp_assist_page)
return 0;
if (!*hvp)
*hvp = __vmalloc(PAGE_SIZE, GFP_KERNEL, PAGE_KERNEL);
if (*hvp) {
u64 val;
val = vmalloc_to_pfn(*hvp);
val = (val << HV_X64_MSR_VP_ASSIST_PAGE_ADDRESS_SHIFT) |
HV_X64_MSR_VP_ASSIST_PAGE_ENABLE;
wrmsrl(HV_X64_MSR_VP_ASSIST_PAGE, val);
}
return 0;
}
@@ -198,6 +218,9 @@ static int hv_cpu_die(unsigned int cpu)
struct hv_reenlightenment_control re_ctrl;
unsigned int new_cpu;
if (hv_vp_assist_page && hv_vp_assist_page[cpu])
wrmsrl(HV_X64_MSR_VP_ASSIST_PAGE, 0);
if (hv_reenlightenment_cb == NULL)
return 0;
@@ -224,6 +247,7 @@ void hyperv_init(void)
{
u64 guest_id, required_msrs;
union hv_x64_msr_hypercall_contents hypercall_msr;
int cpuhp;
if (x86_hyper_type != X86_HYPER_MS_HYPERV)
return;
@@ -241,9 +265,17 @@ void hyperv_init(void)
if (!hv_vp_index)
return;
if (cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "x86/hyperv_init:online",
hv_cpu_init, hv_cpu_die) < 0)
hv_vp_assist_page = kcalloc(num_possible_cpus(),
sizeof(*hv_vp_assist_page), GFP_KERNEL);
if (!hv_vp_assist_page) {
ms_hyperv.hints &= ~HV_X64_ENLIGHTENED_VMCS_RECOMMENDED;
goto free_vp_index;
}
cpuhp = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "x86/hyperv_init:online",
hv_cpu_init, hv_cpu_die);
if (cpuhp < 0)
goto free_vp_assist_page;
/*
* Setup the hypercall page and enable hypercalls.
@@ -256,7 +288,7 @@ void hyperv_init(void)
hv_hypercall_pg = __vmalloc(PAGE_SIZE, GFP_KERNEL, PAGE_KERNEL_RX);
if (hv_hypercall_pg == NULL) {
wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0);
goto free_vp_index;
goto remove_cpuhp_state;
}
rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
@@ -304,6 +336,11 @@ register_msr_cs:
return;
remove_cpuhp_state:
cpuhp_remove_state(cpuhp);
free_vp_assist_page:
kfree(hv_vp_assist_page);
hv_vp_assist_page = NULL;
free_vp_index:
kfree(hv_vp_index);
hv_vp_index = NULL;