forked from Minki/linux
051089a2ee
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2
iQEcBAABAgAGBQJaDdh4AAoJELDendYovxMvPFAH/2QjTys2ydIAdmwke4odpJ7U
xuy7HOQCzOeZ5YsZthzCBsN90VmnDM7X7CcB8weSdjcKlXMSAWD+J1RgkL2iAJhI
8tzIEXECrlNuz4V5mX9TmMgtPCr4qzU3fsts0pZy4fYDq1PVWDefqOwEtbpbWabb
wRSMq/nTb9iASTMgheSC0WfhJneqtJ+J20zrzkGPCBPRFcwfppeP8/7vpkmJslBi
eH/pfchICM4w093T/BfavnsPvhLdjgRuwVzn6+e46s4tLnZAxnLRVQ7SXZXzBORq
/dL/qC0XH3YXdU+XfIs//giZsmLns6SxZaMr4vs6TxFtuzZBKpLtkOKo9zndvxk=
=sZY5
-----END PGP SIGNATURE-----
Merge tag 'for-linus-4.15-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
Pull xen updates from Juergen Gross:
"Xen features and fixes for v4.15-rc1
Apart from several small fixes it contains the following features:
- a series by Joao Martins to add vdso support of the pv clock
interface
- a series by Juergen Gross to add support for Xen pv guests to be
able to run on 5 level paging hosts
- a series by Stefano Stabellini adding the Xen pvcalls frontend
driver using a paravirtualized socket interface"
* tag 'for-linus-4.15-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip: (34 commits)
xen/pvcalls: fix potential endless loop in pvcalls-front.c
xen/pvcalls: Add MODULE_LICENSE()
MAINTAINERS: xen, kvm: track pvclock-abi.h changes
x86/xen/time: setup vcpu 0 time info page
x86/xen/time: set pvclock flags on xen_time_init()
x86/pvclock: add setter for pvclock_pvti_cpu0_va
ptp_kvm: probe for kvm guest availability
xen/privcmd: remove unused variable pageidx
xen: select grant interface version
xen: update arch/x86/include/asm/xen/cpuid.h
xen: add grant interface version dependent constants to gnttab_ops
xen: limit grant v2 interface to the v1 functionality
xen: re-introduce support for grant v2 interface
xen: support priv-mapping in an HVM tools domain
xen/pvcalls: remove redundant check for irq >= 0
xen/pvcalls: fix unsigned less than zero error check
xen/time: Return -ENODEV from xen_get_wallclock()
xen/pvcalls-front: mark expected switch fall-through
xen: xenbus_probe_frontend: mark expected switch fall-throughs
xen/time: do not decrease steal time after live migration on xen
...
107 lines
2.6 KiB
C
107 lines
2.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _ASM_X86_PVCLOCK_H
|
|
#define _ASM_X86_PVCLOCK_H
|
|
|
|
#include <linux/clocksource.h>
|
|
#include <asm/pvclock-abi.h>
|
|
|
|
/* some helper functions for xen and kvm pv clock sources */
|
|
u64 pvclock_clocksource_read(struct pvclock_vcpu_time_info *src);
|
|
u8 pvclock_read_flags(struct pvclock_vcpu_time_info *src);
|
|
void pvclock_set_flags(u8 flags);
|
|
unsigned long pvclock_tsc_khz(struct pvclock_vcpu_time_info *src);
|
|
void pvclock_read_wallclock(struct pvclock_wall_clock *wall,
|
|
struct pvclock_vcpu_time_info *vcpu,
|
|
struct timespec *ts);
|
|
void pvclock_resume(void);
|
|
|
|
void pvclock_touch_watchdogs(void);
|
|
|
|
static __always_inline
|
|
unsigned pvclock_read_begin(const struct pvclock_vcpu_time_info *src)
|
|
{
|
|
unsigned version = src->version & ~1;
|
|
/* Make sure that the version is read before the data. */
|
|
virt_rmb();
|
|
return version;
|
|
}
|
|
|
|
static __always_inline
|
|
bool pvclock_read_retry(const struct pvclock_vcpu_time_info *src,
|
|
unsigned version)
|
|
{
|
|
/* Make sure that the version is re-read after the data. */
|
|
virt_rmb();
|
|
return unlikely(version != src->version);
|
|
}
|
|
|
|
/*
|
|
* Scale a 64-bit delta by scaling and multiplying by a 32-bit fraction,
|
|
* yielding a 64-bit result.
|
|
*/
|
|
static inline u64 pvclock_scale_delta(u64 delta, u32 mul_frac, int shift)
|
|
{
|
|
u64 product;
|
|
#ifdef __i386__
|
|
u32 tmp1, tmp2;
|
|
#else
|
|
ulong tmp;
|
|
#endif
|
|
|
|
if (shift < 0)
|
|
delta >>= -shift;
|
|
else
|
|
delta <<= shift;
|
|
|
|
#ifdef __i386__
|
|
__asm__ (
|
|
"mul %5 ; "
|
|
"mov %4,%%eax ; "
|
|
"mov %%edx,%4 ; "
|
|
"mul %5 ; "
|
|
"xor %5,%5 ; "
|
|
"add %4,%%eax ; "
|
|
"adc %5,%%edx ; "
|
|
: "=A" (product), "=r" (tmp1), "=r" (tmp2)
|
|
: "a" ((u32)delta), "1" ((u32)(delta >> 32)), "2" (mul_frac) );
|
|
#elif defined(__x86_64__)
|
|
__asm__ (
|
|
"mulq %[mul_frac] ; shrd $32, %[hi], %[lo]"
|
|
: [lo]"=a"(product),
|
|
[hi]"=d"(tmp)
|
|
: "0"(delta),
|
|
[mul_frac]"rm"((u64)mul_frac));
|
|
#else
|
|
#error implement me!
|
|
#endif
|
|
|
|
return product;
|
|
}
|
|
|
|
static __always_inline
|
|
u64 __pvclock_read_cycles(const struct pvclock_vcpu_time_info *src, u64 tsc)
|
|
{
|
|
u64 delta = tsc - src->tsc_timestamp;
|
|
u64 offset = pvclock_scale_delta(delta, src->tsc_to_system_mul,
|
|
src->tsc_shift);
|
|
return src->system_time + offset;
|
|
}
|
|
|
|
struct pvclock_vsyscall_time_info {
|
|
struct pvclock_vcpu_time_info pvti;
|
|
} __attribute__((__aligned__(SMP_CACHE_BYTES)));
|
|
|
|
#define PVTI_SIZE sizeof(struct pvclock_vsyscall_time_info)
|
|
|
|
#ifdef CONFIG_PARAVIRT_CLOCK
|
|
void pvclock_set_pvti_cpu0_va(struct pvclock_vsyscall_time_info *pvti);
|
|
struct pvclock_vsyscall_time_info *pvclock_get_pvti_cpu0_va(void);
|
|
#else
|
|
static inline struct pvclock_vsyscall_time_info *pvclock_get_pvti_cpu0_va(void)
|
|
{
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
#endif /* _ASM_X86_PVCLOCK_H */
|