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Commit 57e88b43 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull x86 platform updates from Ingo Molnar:
 "The main changes include various Hyper-V optimizations such as faster
  hypercalls and faster/better TLB flushes - and there's also some
  Intel-MID cleanups"

* 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  tracing/hyper-v: Trace hyperv_mmu_flush_tlb_others()
  x86/hyper-v: Support extended CPU ranges for TLB flush hypercalls
  x86/platform/intel-mid: Make several arrays static, to make code smaller
  MAINTAINERS: Add missed file for Hyper-V
  x86/hyper-v: Use hypercall for remote TLB flush
  hyper-v: Globalize vp_index
  x86/hyper-v: Implement rep hypercalls
  hyper-v: Use fast hypercall for HVCALL_SIGNAL_EVENT
  x86/hyper-v: Introduce fast hypercall implementation
  x86/hyper-v: Make hv_do_hypercall() inline
  x86/hyper-v: Include hyperv/ only when CONFIG_HYPERV is set
  x86/platform/intel-mid: Make 'bt_sfi_data' const
  x86/platform/intel-mid: Make IRQ allocation a bit more flexible
  x86/platform/intel-mid: Group timers callbacks together
parents 3b9f8ed2 773b79f7

MAINTAINERS

+2 −0
Original line number Diff line number Diff line
@@ -6312,6 +6312,7 @@ L: devel@linuxdriverproject.org 
S:	Maintained

F:	Documentation/networking/netvsc.txt

F:	arch/x86/include/asm/mshyperv.h

F:	arch/x86/include/asm/trace/hyperv.h

F:	arch/x86/include/uapi/asm/hyperv.h

F:	arch/x86/kernel/cpu/mshyperv.c

F:	arch/x86/hyperv
@@ -6325,6 +6326,7 @@ F: drivers/uio/uio_hv_generic.c 
F:	drivers/video/fbdev/hyperv_fb.c

F:	net/vmw_vsock/hyperv_transport.c

F:	include/linux/hyperv.h

F:	include/uapi/linux/hyperv.h

F:	tools/hv/

F:	Documentation/ABI/stable/sysfs-bus-vmbus

arch/x86/Kbuild

+1 −1
Original line number Diff line number Diff line
@@ -8,7 +8,7 @@ obj-$(CONFIG_KVM) += kvm/ 
obj-$(CONFIG_XEN) += xen/



# Hyper-V paravirtualization support

obj-$(CONFIG_HYPERVISOR_GUEST) += hyperv/

obj-$(subst m,y,$(CONFIG_HYPERV)) += hyperv/



obj-y += realmode/

obj-y += kernel/

arch/x86/hyperv/Makefile

+1 −1
Original line number Diff line number Diff line 
obj-y		:= hv_init.o
 
obj-y		:= hv_init.o mmu.o

arch/x86/hyperv/hv_init.c

+40 −50
Original line number Diff line number Diff line
@@ -26,6 +26,8 @@ 
#include <linux/mm.h>

#include <linux/clockchips.h>

#include <linux/hyperv.h>

#include <linux/slab.h>

#include <linux/cpuhotplug.h>



#ifdef CONFIG_HYPERV_TSCPAGE
@@ -75,10 +77,25 @@ static struct clocksource hyperv_cs_msr = { 
	.flags		= CLOCK_SOURCE_IS_CONTINUOUS,

};



static void *hypercall_pg;

void *hv_hypercall_pg;

EXPORT_SYMBOL_GPL(hv_hypercall_pg);

struct clocksource *hyperv_cs;

EXPORT_SYMBOL_GPL(hyperv_cs);



u32 *hv_vp_index;

EXPORT_SYMBOL_GPL(hv_vp_index);



static int hv_cpu_init(unsigned int cpu)

{

	u64 msr_vp_index;



	hv_get_vp_index(msr_vp_index);



	hv_vp_index[smp_processor_id()] = msr_vp_index;



	return 0;

}



/*

 * This function is to be invoked early in the boot sequence after the

 * hypervisor has been detected.
@@ -94,6 +111,16 @@ void hyperv_init(void) 
	if (x86_hyper != &x86_hyper_ms_hyperv)

		return;



	/* Allocate percpu VP index */

	hv_vp_index = kmalloc_array(num_possible_cpus(), sizeof(*hv_vp_index),

				    GFP_KERNEL);

	if (!hv_vp_index)

		return;



	if (cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "x86/hyperv_init:online",

			      hv_cpu_init, NULL) < 0)

		goto free_vp_index;



	/*

	 * Setup the hypercall page and enable hypercalls.

	 * 1. Register the guest ID
@@ -102,17 +129,19 @@ void hyperv_init(void) 
	guest_id = generate_guest_id(0, LINUX_VERSION_CODE, 0);

	wrmsrl(HV_X64_MSR_GUEST_OS_ID, guest_id);



	hypercall_pg  = __vmalloc(PAGE_SIZE, GFP_KERNEL, PAGE_KERNEL_RX);

	if (hypercall_pg == NULL) {

	hv_hypercall_pg  = __vmalloc(PAGE_SIZE, GFP_KERNEL, PAGE_KERNEL_RX);

	if (hv_hypercall_pg == NULL) {

		wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0);

		return;

		goto free_vp_index;

	}



	rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);

	hypercall_msr.enable = 1;

	hypercall_msr.guest_physical_address = vmalloc_to_pfn(hypercall_pg);

	hypercall_msr.guest_physical_address = vmalloc_to_pfn(hv_hypercall_pg);

	wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);



	hyper_alloc_mmu();



	/*

	 * Register Hyper-V specific clocksource.

	 */
@@ -148,6 +177,12 @@ void hyperv_init(void) 
	hyperv_cs = &hyperv_cs_msr;

	if (ms_hyperv.features & HV_X64_MSR_TIME_REF_COUNT_AVAILABLE)

		clocksource_register_hz(&hyperv_cs_msr, NSEC_PER_SEC/100);



	return;



free_vp_index:

	kfree(hv_vp_index);

	hv_vp_index = NULL;

}



/*
@@ -170,51 +205,6 @@ void hyperv_cleanup(void) 
}

EXPORT_SYMBOL_GPL(hyperv_cleanup);



/*

 * hv_do_hypercall- Invoke the specified hypercall

 */

u64 hv_do_hypercall(u64 control, void *input, void *output)

{

	u64 input_address = (input) ? virt_to_phys(input) : 0;

	u64 output_address = (output) ? virt_to_phys(output) : 0;

#ifdef CONFIG_X86_64

	u64 hv_status = 0;



	if (!hypercall_pg)

		return (u64)ULLONG_MAX;



	__asm__ __volatile__("mov %0, %%r8" : : "r" (output_address) : "r8");

	__asm__ __volatile__("call *%3" : "=a" (hv_status) :

			     "c" (control), "d" (input_address),

			     "m" (hypercall_pg));



	return hv_status;



#else



	u32 control_hi = control >> 32;

	u32 control_lo = control & 0xFFFFFFFF;

	u32 hv_status_hi = 1;

	u32 hv_status_lo = 1;

	u32 input_address_hi = input_address >> 32;

	u32 input_address_lo = input_address & 0xFFFFFFFF;

	u32 output_address_hi = output_address >> 32;

	u32 output_address_lo = output_address & 0xFFFFFFFF;



	if (!hypercall_pg)

		return (u64)ULLONG_MAX;



	__asm__ __volatile__ ("call *%8" : "=d"(hv_status_hi),

			      "=a"(hv_status_lo) : "d" (control_hi),

			      "a" (control_lo), "b" (input_address_hi),

			      "c" (input_address_lo), "D"(output_address_hi),

			      "S"(output_address_lo), "m" (hypercall_pg));



	return hv_status_lo | ((u64)hv_status_hi << 32);

#endif /* !x86_64 */

}

EXPORT_SYMBOL_GPL(hv_do_hypercall);



void hyperv_report_panic(struct pt_regs *regs)

{

	static bool panic_reported;

arch/x86/hyperv/mmu.c

0 → 100644
+272 −0
Original line number Diff line number Diff line 
#define pr_fmt(fmt)  "Hyper-V: " fmt



#include <linux/hyperv.h>

#include <linux/log2.h>

#include <linux/slab.h>

#include <linux/types.h>



#include <asm/fpu/api.h>

#include <asm/mshyperv.h>

#include <asm/msr.h>

#include <asm/tlbflush.h>



#define CREATE_TRACE_POINTS

#include <asm/trace/hyperv.h>



/* HvFlushVirtualAddressSpace, HvFlushVirtualAddressList hypercalls */

struct hv_flush_pcpu {

	u64 address_space;

	u64 flags;

	u64 processor_mask;

	u64 gva_list[];

};



/* HvFlushVirtualAddressSpaceEx, HvFlushVirtualAddressListEx hypercalls */

struct hv_flush_pcpu_ex {

	u64 address_space;

	u64 flags;

	struct {

		u64 format;

		u64 valid_bank_mask;

		u64 bank_contents[];

	} hv_vp_set;

	u64 gva_list[];

};



/* Each gva in gva_list encodes up to 4096 pages to flush */

#define HV_TLB_FLUSH_UNIT (4096 * PAGE_SIZE)



static struct hv_flush_pcpu __percpu *pcpu_flush;



static struct hv_flush_pcpu_ex __percpu *pcpu_flush_ex;



/*

 * Fills in gva_list starting from offset. Returns the number of items added.

 */

static inline int fill_gva_list(u64 gva_list[], int offset,

				unsigned long start, unsigned long end)

{

	int gva_n = offset;

	unsigned long cur = start, diff;



	do {

		diff = end > cur ? end - cur : 0;



		gva_list[gva_n] = cur & PAGE_MASK;

		/*

		 * Lower 12 bits encode the number of additional

		 * pages to flush (in addition to the 'cur' page).

		 */

		if (diff >= HV_TLB_FLUSH_UNIT)

			gva_list[gva_n] |= ~PAGE_MASK;

		else if (diff)

			gva_list[gva_n] |= (diff - 1) >> PAGE_SHIFT;



		cur += HV_TLB_FLUSH_UNIT;

		gva_n++;



	} while (cur < end);



	return gva_n - offset;

}



/* Return the number of banks in the resulting vp_set */

static inline int cpumask_to_vp_set(struct hv_flush_pcpu_ex *flush,

				    const struct cpumask *cpus)

{

	int cpu, vcpu, vcpu_bank, vcpu_offset, nr_bank = 1;



	/*

	 * Some banks may end up being empty but this is acceptable.

	 */

	for_each_cpu(cpu, cpus) {

		vcpu = hv_cpu_number_to_vp_number(cpu);

		vcpu_bank = vcpu / 64;

		vcpu_offset = vcpu % 64;



		/* valid_bank_mask can represent up to 64 banks */

		if (vcpu_bank >= 64)

			return 0;



		__set_bit(vcpu_offset, (unsigned long *)

			  &flush->hv_vp_set.bank_contents[vcpu_bank]);

		if (vcpu_bank >= nr_bank)

			nr_bank = vcpu_bank + 1;

	}

	flush->hv_vp_set.valid_bank_mask = GENMASK_ULL(nr_bank - 1, 0);



	return nr_bank;

}



static void hyperv_flush_tlb_others(const struct cpumask *cpus,

				    const struct flush_tlb_info *info)

{

	int cpu, vcpu, gva_n, max_gvas;

	struct hv_flush_pcpu *flush;

	u64 status = U64_MAX;

	unsigned long flags;



	trace_hyperv_mmu_flush_tlb_others(cpus, info);



	if (!pcpu_flush || !hv_hypercall_pg)

		goto do_native;



	if (cpumask_empty(cpus))

		return;



	local_irq_save(flags);



	flush = this_cpu_ptr(pcpu_flush);



	if (info->mm) {

		flush->address_space = virt_to_phys(info->mm->pgd);

		flush->flags = 0;

	} else {

		flush->address_space = 0;

		flush->flags = HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES;

	}



	flush->processor_mask = 0;

	if (cpumask_equal(cpus, cpu_present_mask)) {

		flush->flags |= HV_FLUSH_ALL_PROCESSORS;

	} else {

		for_each_cpu(cpu, cpus) {

			vcpu = hv_cpu_number_to_vp_number(cpu);

			if (vcpu >= 64)

				goto do_native;



			__set_bit(vcpu, (unsigned long *)

				  &flush->processor_mask);

		}

	}



	/*

	 * We can flush not more than max_gvas with one hypercall. Flush the

	 * whole address space if we were asked to do more.

	 */

	max_gvas = (PAGE_SIZE - sizeof(*flush)) / sizeof(flush->gva_list[0]);



	if (info->end == TLB_FLUSH_ALL) {

		flush->flags |= HV_FLUSH_NON_GLOBAL_MAPPINGS_ONLY;

		status = hv_do_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE,

					 flush, NULL);

	} else if (info->end &&

		   ((info->end - info->start)/HV_TLB_FLUSH_UNIT) > max_gvas) {

		status = hv_do_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE,

					 flush, NULL);

	} else {

		gva_n = fill_gva_list(flush->gva_list, 0,

				      info->start, info->end);

		status = hv_do_rep_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST,

					     gva_n, 0, flush, NULL);

	}



	local_irq_restore(flags);



	if (!(status & HV_HYPERCALL_RESULT_MASK))

		return;

do_native:

	native_flush_tlb_others(cpus, info);

}



static void hyperv_flush_tlb_others_ex(const struct cpumask *cpus,

				       const struct flush_tlb_info *info)

{

	int nr_bank = 0, max_gvas, gva_n;

	struct hv_flush_pcpu_ex *flush;

	u64 status = U64_MAX;

	unsigned long flags;



	trace_hyperv_mmu_flush_tlb_others(cpus, info);



	if (!pcpu_flush_ex || !hv_hypercall_pg)

		goto do_native;



	if (cpumask_empty(cpus))

		return;



	local_irq_save(flags);



	flush = this_cpu_ptr(pcpu_flush_ex);



	if (info->mm) {

		flush->address_space = virt_to_phys(info->mm->pgd);

		flush->flags = 0;

	} else {

		flush->address_space = 0;

		flush->flags = HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES;

	}



	flush->hv_vp_set.valid_bank_mask = 0;



	if (!cpumask_equal(cpus, cpu_present_mask)) {

		flush->hv_vp_set.format = HV_GENERIC_SET_SPARCE_4K;

		nr_bank = cpumask_to_vp_set(flush, cpus);

	}



	if (!nr_bank) {

		flush->hv_vp_set.format = HV_GENERIC_SET_ALL;

		flush->flags |= HV_FLUSH_ALL_PROCESSORS;

	}



	/*

	 * We can flush not more than max_gvas with one hypercall. Flush the

	 * whole address space if we were asked to do more.

	 */

	max_gvas =

		(PAGE_SIZE - sizeof(*flush) - nr_bank *

		 sizeof(flush->hv_vp_set.bank_contents[0])) /

		sizeof(flush->gva_list[0]);



	if (info->end == TLB_FLUSH_ALL) {

		flush->flags |= HV_FLUSH_NON_GLOBAL_MAPPINGS_ONLY;

		status = hv_do_rep_hypercall(

			HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX,

			0, nr_bank + 2, flush, NULL);

	} else if (info->end &&

		   ((info->end - info->start)/HV_TLB_FLUSH_UNIT) > max_gvas) {

		status = hv_do_rep_hypercall(

			HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX,

			0, nr_bank + 2, flush, NULL);

	} else {

		gva_n = fill_gva_list(flush->gva_list, nr_bank,

				      info->start, info->end);

		status = hv_do_rep_hypercall(

			HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX,

			gva_n, nr_bank + 2, flush, NULL);

	}



	local_irq_restore(flags);



	if (!(status & HV_HYPERCALL_RESULT_MASK))

		return;

do_native:

	native_flush_tlb_others(cpus, info);

}



void hyperv_setup_mmu_ops(void)

{

	if (!(ms_hyperv.hints & HV_X64_REMOTE_TLB_FLUSH_RECOMMENDED))

		return;



	setup_clear_cpu_cap(X86_FEATURE_PCID);



	if (!(ms_hyperv.hints & HV_X64_EX_PROCESSOR_MASKS_RECOMMENDED)) {

		pr_info("Using hypercall for remote TLB flush\n");

		pv_mmu_ops.flush_tlb_others = hyperv_flush_tlb_others;

	} else {

		pr_info("Using ext hypercall for remote TLB flush\n");

		pv_mmu_ops.flush_tlb_others = hyperv_flush_tlb_others_ex;

	}

}



void hyper_alloc_mmu(void)

{

	if (!(ms_hyperv.hints & HV_X64_REMOTE_TLB_FLUSH_RECOMMENDED))

		return;



	if (!(ms_hyperv.hints & HV_X64_EX_PROCESSOR_MASKS_RECOMMENDED))

		pcpu_flush = __alloc_percpu(PAGE_SIZE, PAGE_SIZE);

	else

		pcpu_flush_ex = __alloc_percpu(PAGE_SIZE, PAGE_SIZE);

}