leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

xen: fixes for 4.19-rc2

Browse Source 
-----BEGIN PGP SIGNATURE-----
 
 iHUEABYIAB0WIQRTLbB6QfY48x44uB6AXGG7T9hjvgUCW4lM6AAKCRCAXGG7T9hj
 vs8AAQDysFccg97UdopW3B7yklIaRqkfEIAsxe65f191MXsH2AEAp5SKxZqRPqBP
 a9WHDj8ShB3BhZ/IxpdO9Y59U3Jo4wA=
 =Gt4c
 -----END PGP SIGNATURE-----

Merge tag 'for-linus-4.19b-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

Pull xen fixes from Juergen Gross:

 - minor cleanup avoiding a warning when building with new gcc

 - a patch to add a new sysfs node for Xen frontend/backend drivers to
   make it easier to obtain the state of a pv device

 - two fixes for 32-bit pv-guests to avoid intermediate L1TF vulnerable
   PTEs

* tag 'for-linus-4.19b-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  x86/xen: remove redundant variable save_pud
  xen: export device state to sysfs
  x86/pae: use 64 bit atomic xchg function in native_ptep_get_and_clear
  x86/xen: don't write ptes directly in 32-bit PV guests
This commit is contained in:
Linus Torvalds 2018-08-31 08:45:16 -07:00
commit 4290d5b9ca
4 changed files with 24 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
Documentation/ABI/stable/sysfs-bus-xen-backend
View File

@ -73,3 +73,12 @@ KernelVersion: 3.0
Contact: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Description:
Number of sectors written by the frontend.
What: /sys/bus/xen-backend/devices/*/state
Date: August 2018
KernelVersion: 4.19
Contact: Joe Jin <joe.jin@oracle.com>
Description:
The state of the device. One of: 'Unknown',
'Initialising', 'Initialised', 'Connected', 'Closing',
'Closed', 'Reconfiguring', 'Reconfigured'.

7
arch/x86/include/asm/pgtable-3level.h
View File

@ -2,6 +2,8 @@
#ifndef _ASM_X86_PGTABLE_3LEVEL_H
#define _ASM_X86_PGTABLE_3LEVEL_H
#include <asm/atomic64_32.h>
/*
* Intel Physical Address Extension (PAE) Mode - three-level page
* tables on PPro+ CPUs.
@ -150,10 +152,7 @@ static inline pte_t native_ptep_get_and_clear(pte_t *ptep)
{
pte_t res;
/* xchg acts as a barrier before the setting of the high bits */
res.pte_low = xchg(&ptep->pte_low, 0);
res.pte_high = ptep->pte_high;
ptep->pte_high = 0;
res.pte = (pteval_t)arch_atomic64_xchg((atomic64_t *)ptep, 0);
return res;
}

9
arch/x86/xen/mmu_pv.c
View File

@ -435,14 +435,13 @@ static void xen_set_pud(pud_t *ptr, pud_t val)
static void xen_set_pte_atomic(pte_t *ptep, pte_t pte)
{
trace_xen_mmu_set_pte_atomic(ptep, pte);
set_64bit((u64 *)ptep, native_pte_val(pte));
__xen_set_pte(ptep, pte);
}
static void xen_pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
trace_xen_mmu_pte_clear(mm, addr, ptep);
if (!xen_batched_set_pte(ptep, native_make_pte(0)))
native_pte_clear(mm, addr, ptep);
__xen_set_pte(ptep, native_make_pte(0));
}
static void xen_pmd_clear(pmd_t *pmdp)
@ -1570,7 +1569,7 @@ static void __init xen_set_pte_init(pte_t *ptep, pte_t pte)
pte = __pte_ma(((pte_val_ma(*ptep) & _PAGE_RW) | ~_PAGE_RW) &
pte_val_ma(pte));
#endif
native_set_pte(ptep, pte);
__xen_set_pte(ptep, pte);
}
/* Early in boot, while setting up the initial pagetable, assume
@ -2061,7 +2060,6 @@ void __init xen_relocate_p2m(void)
pud_t *pud;
pgd_t *pgd;
unsigned long *new_p2m;
int save_pud;
size = PAGE_ALIGN(xen_start_info->nr_pages * sizeof(unsigned long));
n_pte = roundup(size, PAGE_SIZE) >> PAGE_SHIFT;
@ -2091,7 +2089,6 @@ void __init xen_relocate_p2m(void)
pgd = __va(read_cr3_pa());
new_p2m = (unsigned long *)(2 * PGDIR_SIZE);
save_pud = n_pud;
for (idx_pud = 0; idx_pud < n_pud; idx_pud++) {
pud = early_memremap(pud_phys, PAGE_SIZE);
clear_page(pud);

9
drivers/xen/xenbus/xenbus_probe.c
View File

@ -402,10 +402,19 @@ static ssize_t modalias_show(struct device *dev,
}
static DEVICE_ATTR_RO(modalias);
static ssize_t state_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(buf, "%s\n",
xenbus_strstate(to_xenbus_device(dev)->state));
}
static DEVICE_ATTR_RO(state);
static struct attribute *xenbus_dev_attrs[] = {
&dev_attr_nodename.attr,
&dev_attr_devtype.attr,
&dev_attr_modalias.attr,
&dev_attr_state.attr,
NULL,
};