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

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Pull x86 hyperv updates from Ingo Molnar:
 "Misc updates related to page size abstractions within the HyperV code,
  in preparation for future features"

* 'x86-hyperv-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  drivers: hv: vmbus: Replace page definition with Hyper-V specific one
  x86/hyperv: Add functions to allocate/deallocate page for Hyper-V
  x86/hyperv: Create and use Hyper-V page definitions
This commit is contained in:
Linus Torvalds 2019-09-16 19:39:00 -07:00
commit e2bddc20b5
4 changed files with 33 additions and 6 deletions
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14
arch/x86/hyperv/hv_init.c
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@ -37,6 +37,20 @@ EXPORT_SYMBOL_GPL(hyperv_pcpu_input_arg);
u32 hv_max_vp_index;
EXPORT_SYMBOL_GPL(hv_max_vp_index);
void *hv_alloc_hyperv_page(void)
{
BUILD_BUG_ON(PAGE_SIZE != HV_HYP_PAGE_SIZE);
return (void *)__get_free_page(GFP_KERNEL);
}
EXPORT_SYMBOL_GPL(hv_alloc_hyperv_page);
void hv_free_hyperv_page(unsigned long addr)
{
free_page(addr);
}
EXPORT_SYMBOL_GPL(hv_free_hyperv_page);
static int hv_cpu_init(unsigned int cpu)
{
u64 msr_vp_index;

12
arch/x86/include/asm/hyperv-tlfs.h
View File

@ -12,6 +12,16 @@
#include <linux/types.h>
#include <asm/page.h>
/*
* While not explicitly listed in the TLFS, Hyper-V always runs with a page size
* of 4096. These definitions are used when communicating with Hyper-V using
* guest physical pages and guest physical page addresses, since the guest page
* size may not be 4096 on all architectures.
*/
#define HV_HYP_PAGE_SHIFT 12
#define HV_HYP_PAGE_SIZE BIT(HV_HYP_PAGE_SHIFT)
#define HV_HYP_PAGE_MASK (~(HV_HYP_PAGE_SIZE - 1))
/*
* The below CPUID leaves are present if VersionAndFeatures.HypervisorPresent
* is set by CPUID(HvCpuIdFunctionVersionAndFeatures).
@ -847,7 +857,7 @@ union hv_gpa_page_range {
* count is equal with how many entries of union hv_gpa_page_range can
* be populated into the input parameter page.
*/
#define HV_MAX_FLUSH_REP_COUNT ((PAGE_SIZE - 2 * sizeof(u64)) / \
#define HV_MAX_FLUSH_REP_COUNT ((HV_HYP_PAGE_SIZE - 2 * sizeof(u64)) / \
sizeof(union hv_gpa_page_range))
struct hv_guest_mapping_flush_list {

5
arch/x86/include/asm/mshyperv.h
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@ -218,7 +218,8 @@ static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
void __init hyperv_init(void);
void hyperv_setup_mmu_ops(void);
void *hv_alloc_hyperv_page(void);
void hv_free_hyperv_page(unsigned long addr);
void hyperv_reenlightenment_intr(struct pt_regs *regs);
void set_hv_tscchange_cb(void (*cb)(void));
void clear_hv_tscchange_cb(void);
@ -241,6 +242,8 @@ static inline void hv_apic_init(void) {}
#else /* CONFIG_HYPERV */
static inline void hyperv_init(void) {}
static inline void hyperv_setup_mmu_ops(void) {}
static inline void *hv_alloc_hyperv_page(void) { return NULL; }
static inline void hv_free_hyperv_page(unsigned long addr) {}
static inline void set_hv_tscchange_cb(void (*cb)(void)) {}
static inline void clear_hv_tscchange_cb(void) {}
static inline void hyperv_stop_tsc_emulation(void) {};

8
drivers/hv/hyperv_vmbus.h
View File

@ -190,11 +190,11 @@ int hv_ringbuffer_read(struct vmbus_channel *channel,
u64 *requestid, bool raw);
/*
* Maximum channels is determined by the size of the interrupt page
* which is PAGE_SIZE. 1/2 of PAGE_SIZE is for send endpoint interrupt
* and the other is receive endpoint interrupt
* The Maximum number of channels (16348) is determined by the size of the
* interrupt page, which is HV_HYP_PAGE_SIZE. 1/2 of HV_HYP_PAGE_SIZE is to
* send endpoint interrupts, and the other is to receive endpoint interrupts.
*/
#define MAX_NUM_CHANNELS ((PAGE_SIZE >> 1) << 3) /* 16348 channels */
#define MAX_NUM_CHANNELS ((HV_HYP_PAGE_SIZE >> 1) << 3)
/* The value here must be in multiple of 32 */
/* TODO: Need to make this configurable */