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xen/x86: Remove PVH support 

We are replacing existing PVH guests with new implementation.

We are keeping xen_pvh_domain() macro (for now set to zero) because
when we introduce new PVH implementation later in this series we will
reuse current PVH-specific code (xen_pvh_gnttab_setup()), and that
code is conditioned by 'if (xen_pvh_domain())'. (We will also need
a noop xen_pvh_domain() for !CONFIG_XEN_PVH).

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Boris Ostrovsky 2017-02-03 16:57:22 -05:00
parent 5a7670ee23
commit 063334f305
9 changed files with 54 additions and 307 deletions
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116
arch/x86/xen/enlighten.c
View File

@ -1138,10 +1138,11 @@ void xen_setup_vcpu_info_placement(void)
xen_vcpu_setup(cpu);
}
/* xen_vcpu_setup managed to place the vcpu_info within the
* percpu area for all cpus, so make use of it. Note that for
* PVH we want to use native IRQ mechanism. */
if (have_vcpu_info_placement && !xen_pvh_domain()) {
/*
* xen_vcpu_setup managed to place the vcpu_info within the
* percpu area for all cpus, so make use of it.
*/
if (have_vcpu_info_placement) {
pv_irq_ops.save_fl = __PV_IS_CALLEE_SAVE(xen_save_fl_direct);
pv_irq_ops.restore_fl = __PV_IS_CALLEE_SAVE(xen_restore_fl_direct);
pv_irq_ops.irq_disable = __PV_IS_CALLEE_SAVE(xen_irq_disable_direct);
@ -1413,49 +1414,9 @@ static void __init xen_boot_params_init_edd(void)
* Set up the GDT and segment registers for -fstack-protector. Until
* we do this, we have to be careful not to call any stack-protected
* function, which is most of the kernel.
*
* Note, that it is __ref because the only caller of this after init
* is PVH which is not going to use xen_load_gdt_boot or other
* __init functions.
*/
static void __ref xen_setup_gdt(int cpu)
static void xen_setup_gdt(int cpu)
{
if (xen_feature(XENFEAT_auto_translated_physmap)) {
#ifdef CONFIG_X86_64
unsigned long dummy;
load_percpu_segment(cpu); /* We need to access per-cpu area */
switch_to_new_gdt(cpu); /* GDT and GS set */
/* We are switching of the Xen provided GDT to our HVM mode
* GDT. The new GDT has __KERNEL_CS with CS.L = 1
* and we are jumping to reload it.
*/
asm volatile ("pushq %0\n"
"leaq 1f(%%rip),%0\n"
"pushq %0\n"
"lretq\n"
"1:\n"
: "=&r" (dummy) : "0" (__KERNEL_CS));
/*
* While not needed, we also set the %es, %ds, and %fs
* to zero. We don't care about %ss as it is NULL.
* Strictly speaking this is not needed as Xen zeros those
* out (and also MSR_FS_BASE, MSR_GS_BASE, MSR_KERNEL_GS_BASE)
*
* Linux zeros them in cpu_init() and in secondary_startup_64
* (for BSP).
*/
loadsegment(es, 0);
loadsegment(ds, 0);
loadsegment(fs, 0);
#else
/* PVH: TODO Implement. */
BUG();
#endif
return; /* PVH does not need any PV GDT ops. */
}
pv_cpu_ops.write_gdt_entry = xen_write_gdt_entry_boot;
pv_cpu_ops.load_gdt = xen_load_gdt_boot;
@ -1466,59 +1427,6 @@ static void __ref xen_setup_gdt(int cpu)
pv_cpu_ops.load_gdt = xen_load_gdt;
}
#ifdef CONFIG_XEN_PVH
/*
* A PV guest starts with default flags that are not set for PVH, set them
* here asap.
*/
static void xen_pvh_set_cr_flags(int cpu)
{
/* Some of these are setup in 'secondary_startup_64'. The others:
* X86_CR0_TS, X86_CR0_PE, X86_CR0_ET are set by Xen for HVM guests
* (which PVH shared codepaths), while X86_CR0_PG is for PVH. */
write_cr0(read_cr0() | X86_CR0_MP | X86_CR0_NE | X86_CR0_WP | X86_CR0_AM);
if (!cpu)
return;
/*
* For BSP, PSE PGE are set in probe_page_size_mask(), for APs
* set them here. For all, OSFXSR OSXMMEXCPT are set in fpu__init_cpu().
*/
if (boot_cpu_has(X86_FEATURE_PSE))
cr4_set_bits_and_update_boot(X86_CR4_PSE);
if (boot_cpu_has(X86_FEATURE_PGE))
cr4_set_bits_and_update_boot(X86_CR4_PGE);
}
/*
* Note, that it is ref - because the only caller of this after init
* is PVH which is not going to use xen_load_gdt_boot or other
* __init functions.
*/
void __ref xen_pvh_secondary_vcpu_init(int cpu)
{
xen_setup_gdt(cpu);
xen_pvh_set_cr_flags(cpu);
}
static void __init xen_pvh_early_guest_init(void)
{
if (!xen_feature(XENFEAT_auto_translated_physmap))
return;
BUG_ON(!xen_feature(XENFEAT_hvm_callback_vector));
xen_pvh_early_cpu_init(0, false);
xen_pvh_set_cr_flags(0);
#ifdef CONFIG_X86_32
BUG(); /* PVH: Implement proper support. */
#endif
}
#endif /* CONFIG_XEN_PVH */
static void __init xen_dom0_set_legacy_features(void)
{
x86_platform.legacy.rtc = 1;
@ -1555,23 +1463,16 @@ asmlinkage __visible void __init xen_start_kernel(void)
xen_domain_type = XEN_PV_DOMAIN;
xen_setup_features();
#ifdef CONFIG_XEN_PVH
xen_pvh_early_guest_init();
#endif
xen_setup_machphys_mapping();
/* Install Xen paravirt ops */
pv_info = xen_info;
pv_init_ops = xen_init_ops;
if (!xen_pvh_domain()) {
pv_cpu_ops = xen_cpu_ops;
x86_platform.get_nmi_reason = xen_get_nmi_reason;
}
if (xen_feature(XENFEAT_auto_translated_physmap))
x86_init.resources.memory_setup = xen_auto_xlated_memory_setup;
else
x86_init.resources.memory_setup = xen_memory_setup;
x86_init.oem.arch_setup = xen_arch_setup;
x86_init.oem.banner = xen_banner;
@ -1665,8 +1566,6 @@ asmlinkage __visible void __init xen_start_kernel(void)
/* set the limit of our address space */
xen_reserve_top();
/* PVH: runs at default kernel iopl of 0 */
if (!xen_pvh_domain()) {
/*
* We used to do this in xen_arch_setup, but that is too late
* on AMD were early_cpu_init (run before ->arch_setup()) calls
@ -1676,7 +1575,6 @@ asmlinkage __visible void __init xen_start_kernel(void)
rc = HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl);
if (rc != 0)
xen_raw_printk("physdev_op failed %d\n", rc);
}
#ifdef CONFIG_X86_32
/* set up basic CPUID stuff */

21
arch/x86/xen/mmu.c
View File

@ -1792,10 +1792,6 @@ static void __init set_page_prot_flags(void *addr, pgprot_t prot,
unsigned long pfn = __pa(addr) >> PAGE_SHIFT;
pte_t pte = pfn_pte(pfn, prot);
/* For PVH no need to set R/O or R/W to pin them or unpin them. */
if (xen_feature(XENFEAT_auto_translated_physmap))
return;
if (HYPERVISOR_update_va_mapping((unsigned long)addr, pte, flags))
BUG();
}
@ -1902,8 +1898,7 @@ static void __init check_pt_base(unsigned long *pt_base, unsigned long *pt_end,
* level2_ident_pgt, and level2_kernel_pgt. This means that only the
* kernel has a physical mapping to start with - but that's enough to
* get __va working. We need to fill in the rest of the physical
* mapping once some sort of allocator has been set up. NOTE: for
* PVH, the page tables are native.
* mapping once some sort of allocator has been set up.
*/
void __init xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn)
{
@ -2812,16 +2807,6 @@ static int do_remap_gfn(struct vm_area_struct *vma,
BUG_ON(!((vma->vm_flags & (VM_PFNMAP | VM_IO)) == (VM_PFNMAP | VM_IO)));
if (xen_feature(XENFEAT_auto_translated_physmap)) {
#ifdef CONFIG_XEN_PVH
/* We need to update the local page tables and the xen HAP */
return xen_xlate_remap_gfn_array(vma, addr, gfn, nr, err_ptr,
prot, domid, pages);
#else
return -EINVAL;
#endif
}
rmd.mfn = gfn;
rmd.prot = prot;
/* We use the err_ptr to indicate if there we are doing a contiguous
@ -2915,10 +2900,6 @@ int xen_unmap_domain_gfn_range(struct vm_area_struct *vma,
if (!pages || !xen_feature(XENFEAT_auto_translated_physmap))
return 0;
#ifdef CONFIG_XEN_PVH
return xen_xlate_unmap_gfn_range(vma, numpgs, pages);
#else
return -EINVAL;
#endif
}
EXPORT_SYMBOL_GPL(xen_unmap_domain_gfn_range);

35
arch/x86/xen/setup.c
View File

@ -914,39 +914,6 @@ char * __init xen_memory_setup(void)
return "Xen";
}
/*
* Machine specific memory setup for auto-translated guests.
*/
char * __init xen_auto_xlated_memory_setup(void)
{
struct xen_memory_map memmap;
int i;
int rc;
memmap.nr_entries = ARRAY_SIZE(xen_e820_map);
set_xen_guest_handle(memmap.buffer, xen_e820_map);
rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap);
if (rc < 0)
panic("No memory map (%d)\n", rc);
xen_e820_map_entries = memmap.nr_entries;
sanitize_e820_map(xen_e820_map, ARRAY_SIZE(xen_e820_map),
&xen_e820_map_entries);
for (i = 0; i < xen_e820_map_entries; i++)
e820_add_region(xen_e820_map[i].addr, xen_e820_map[i].size,
xen_e820_map[i].type);
/* Remove p2m info, it is not needed. */
xen_start_info->mfn_list = 0;
xen_start_info->first_p2m_pfn = 0;
xen_start_info->nr_p2m_frames = 0;
return "Xen";
}
/*
* Set the bit indicating "nosegneg" library variants should be used.
* We only need to bother in pure 32-bit mode; compat 32-bit processes
@ -1032,7 +999,7 @@ void __init xen_pvmmu_arch_setup(void)
void __init xen_arch_setup(void)
{
xen_panic_handler_init();
if (!xen_feature(XENFEAT_auto_translated_physmap))
xen_pvmmu_arch_setup();
#ifdef CONFIG_ACPI

28
arch/x86/xen/smp.c
View File

@ -99,18 +99,8 @@ static void cpu_bringup(void)
local_irq_enable();
}
/*
* Note: cpu parameter is only relevant for PVH. The reason for passing it
* is we can't do smp_processor_id until the percpu segments are loaded, for
* which we need the cpu number! So we pass it in rdi as first parameter.
*/
asmlinkage __visible void cpu_bringup_and_idle(int cpu)
asmlinkage __visible void cpu_bringup_and_idle(void)
{
#ifdef CONFIG_XEN_PVH
if (xen_feature(XENFEAT_auto_translated_physmap) &&
xen_feature(XENFEAT_supervisor_mode_kernel))
xen_pvh_secondary_vcpu_init(cpu);
#endif
cpu_bringup();
cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
}
@ -404,13 +394,11 @@ cpu_initialize_context(unsigned int cpu, struct task_struct *idle)
gdt = get_cpu_gdt_table(cpu);
#ifdef CONFIG_X86_32
/* Note: PVH is not yet supported on x86_32. */
ctxt->user_regs.fs = __KERNEL_PERCPU;
ctxt->user_regs.gs = __KERNEL_STACK_CANARY;
#endif
memset(&ctxt->fpu_ctxt, 0, sizeof(ctxt->fpu_ctxt));
if (!xen_feature(XENFEAT_auto_translated_physmap)) {
ctxt->user_regs.eip = (unsigned long)cpu_bringup_and_idle;
ctxt->flags = VGCF_IN_KERNEL;
ctxt->user_regs.eflags = 0x1000; /* IOPL_RING1 */
@ -446,19 +434,7 @@ cpu_initialize_context(unsigned int cpu, struct task_struct *idle)
(unsigned long)xen_failsafe_callback;
ctxt->user_regs.cs = __KERNEL_CS;
per_cpu(xen_cr3, cpu) = __pa(swapper_pg_dir);
}
#ifdef CONFIG_XEN_PVH
else {
/*
* The vcpu comes on kernel page tables which have the NX pte
* bit set. This means before DS/SS is touched, NX in
* EFER must be set. Hence the following assembly glue code.
*/
ctxt->user_regs.eip = (unsigned long)xen_pvh_early_cpu_init;
ctxt->user_regs.rdi = cpu;
ctxt->user_regs.rsi = true; /* entry == true */
}
#endif
ctxt->user_regs.esp = idle->thread.sp0 - sizeof(struct pt_regs);
ctxt->ctrlreg[3] = xen_pfn_to_cr3(virt_to_gfn(swapper_pg_dir));
if (HYPERVISOR_vcpu_op(VCPUOP_initialise, xen_vcpu_nr(cpu), ctxt))

8
arch/x86/xen/smp.h
View File

@ -21,12 +21,4 @@ static inline int xen_smp_intr_init(unsigned int cpu)
static inline void xen_smp_intr_free(unsigned int cpu) {}
#endif /* CONFIG_SMP */
#ifdef CONFIG_XEN_PVH
extern void xen_pvh_early_cpu_init(int cpu, bool entry);
#else
static inline void xen_pvh_early_cpu_init(int cpu, bool entry)
{
}
#endif
#endif

62
arch/x86/xen/xen-head.S
View File

@ -16,25 +16,6 @@
#include <xen/interface/xen-mca.h>
#include <asm/xen/interface.h>
#ifdef CONFIG_XEN_PVH
#define PVH_FEATURES_STR "|writable_descriptor_tables|auto_translated_physmap|supervisor_mode_kernel"
/* Note the lack of 'hvm_callback_vector'. Older hypervisor will
* balk at this being part of XEN_ELFNOTE_FEATURES, so we put it in
* XEN_ELFNOTE_SUPPORTED_FEATURES which older hypervisors will ignore.
*/
#define PVH_FEATURES ((1 << XENFEAT_writable_page_tables) | \
(1 << XENFEAT_auto_translated_physmap) | \
(1 << XENFEAT_supervisor_mode_kernel) | \
(1 << XENFEAT_hvm_callback_vector))
/* The XENFEAT_writable_page_tables is not stricly necessary as we set that
* up regardless whether this CONFIG option is enabled or not, but it
* clarifies what the right flags need to be.
*/
#else
#define PVH_FEATURES_STR ""
#define PVH_FEATURES (0)
#endif
__INIT
ENTRY(startup_xen)
cld
@ -54,41 +35,6 @@ ENTRY(startup_xen)
__FINIT
#ifdef CONFIG_XEN_PVH
/*
* xen_pvh_early_cpu_init() - early PVH VCPU initialization
* @cpu: this cpu number (%rdi)
* @entry: true if this is a secondary vcpu coming up on this entry
* point, false if this is the boot CPU being initialized for
* the first time (%rsi)
*
* Note: This is called as a function on the boot CPU, and is the entry point
* on the secondary CPU.
*/
ENTRY(xen_pvh_early_cpu_init)
mov %rsi, %r11
/* Gather features to see if NX implemented. */
mov $0x80000001, %eax
cpuid
mov %edx, %esi
mov $MSR_EFER, %ecx
rdmsr
bts $_EFER_SCE, %eax
bt $20, %esi
jnc 1f /* No NX, skip setting it */
bts $_EFER_NX, %eax
1: wrmsr
#ifdef CONFIG_SMP
cmp $0, %r11b
jne cpu_bringup_and_idle
#endif
ret
#endif /* CONFIG_XEN_PVH */
.pushsection .text
.balign PAGE_SIZE
ENTRY(hypercall_page)
@ -114,10 +60,10 @@ ENTRY(hypercall_page)
#endif
ELFNOTE(Xen, XEN_ELFNOTE_ENTRY, _ASM_PTR startup_xen)
ELFNOTE(Xen, XEN_ELFNOTE_HYPERCALL_PAGE, _ASM_PTR hypercall_page)
ELFNOTE(Xen, XEN_ELFNOTE_FEATURES, .ascii "!writable_page_tables|pae_pgdir_above_4gb"; .asciz PVH_FEATURES_STR)
ELFNOTE(Xen, XEN_ELFNOTE_SUPPORTED_FEATURES, .long (PVH_FEATURES) |
(1 << XENFEAT_writable_page_tables) |
(1 << XENFEAT_dom0))
ELFNOTE(Xen, XEN_ELFNOTE_FEATURES,
.ascii "!writable_page_tables|pae_pgdir_above_4gb")
ELFNOTE(Xen, XEN_ELFNOTE_SUPPORTED_FEATURES,
.long (1 << XENFEAT_writable_page_tables) | (1 << XENFEAT_dom0))
ELFNOTE(Xen, XEN_ELFNOTE_PAE_MODE, .asciz "yes")
ELFNOTE(Xen, XEN_ELFNOTE_LOADER, .asciz "generic")
ELFNOTE(Xen, XEN_ELFNOTE_L1_MFN_VALID,

1
arch/x86/xen/xen-ops.h
View File

@ -146,5 +146,4 @@ __visible void xen_adjust_exception_frame(void);
extern int xen_panic_handler_init(void);
void xen_pvh_secondary_vcpu_init(int cpu);
#endif /* XEN_OPS_H */

1
drivers/xen/events/events_base.c
View File

@ -1704,7 +1704,6 @@ void __init xen_init_IRQ(void)
pirq_eoi_map = (void *)__get_free_page(GFP_KERNEL|__GFP_ZERO);
eoi_gmfn.gmfn = virt_to_gfn(pirq_eoi_map);
rc = HYPERVISOR_physdev_op(PHYSDEVOP_pirq_eoi_gmfn_v2, &eoi_gmfn);
/* TODO: No PVH support for PIRQ EOI */
if (rc != 0) {
free_page((unsigned long) pirq_eoi_map);
pirq_eoi_map = NULL;

13
include/xen/xen.h
View File

@ -29,17 +29,6 @@ extern enum xen_domain_type xen_domain_type;
#define xen_initial_domain() (0)
#endif /* CONFIG_XEN_DOM0 */
#ifdef CONFIG_XEN_PVH
/* This functionality exists only for x86. The XEN_PVHVM support exists
* only in x86 world - hence on ARM it will be always disabled.
* N.B. ARM guests are neither PV nor HVM nor PVHVM.
* It's a bit like PVH but is different also (it's further towards the H
* end of the spectrum than even PVH).
*/
#include <xen/features.h>
#define xen_pvh_domain() (xen_pv_domain() && \
xen_feature(XENFEAT_auto_translated_physmap))
#else
#define xen_pvh_domain() (0)
#endif
#endif /* _XEN_XEN_H */