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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v2] x86/hvm: unify HVM and PVH hypercall tables.
Stage one of many in merging PVH and HVM code in the hypervisor.
This exposes a few new hypercalls to HVM guests, all of which were
already available to PVH ones:
- XENMEM_memory_map / XENMEM_machine_memory_map / XENMEM_machphys_mapping:
These are basically harmless, if a bit useless to plain HVM.
- VCPUOP_send_nmi / VCPUOP_initialise / VCPUOP[_is]_up / VCPUOP_down
This will eventually let HVM guests bring up APs the way PVH ones do.
For now, the VCPUOP_initialise paths are still gated on is_pvh.
- VCPUOP_get_physid
Harmless.
- __HYPERVISOR_platform_op (XSM_PRIV callers only).
- __HYPERVISOR_mmuext_op.
The pagetable manipulation MMUEXT ops are already denied
(or no-ops) to paging_mode_refcounts() domains; the baseptr ones
are already denied to paging_mode_translate() domains.
I have restricted MMUEXT[UN]MARK_SUPER to !paging_mode_refcounts()
domains as well, as I can see no need for them in PVH.
I have also restricted MMUEXT_CLEAR_PAGE / MMUEXT_COPY_PAGE
to PV domains only, as there is no need for them in HVM/PVH ones
and they would lead to complication with sharing/paging operations.
That leaves TLB and cache flush operations, which are OK.
- PHYSDEVOP_* (only for hardware control domains).
Also make ops that touch PV vcpu state (PHYSDEVOP_set_iopl and
PHYSDEVOP_set_iobitmap) gate on is_pv rather than !is_pvh.
PVH guests can also see a few hypercalls that they couldn't before,
but which were already available to HVM guests:
- __HYPERVISOR_set_timer_op
- __HYPERVISOR_tmem_op
Signed-off-by: Tim Deegan <tim@xxxxxxx>
Cc: Keir Fraser <keir@xxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>
Cc: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
---
v2: restrict MMUEXT_CLEAR_PAGE / MMUEXT_COPY_PAGE;
reword to correcly state that some MMUEXT ops are noops; and
use if() rather than one-clause switch() in a few places.
---
xen/arch/x86/hvm/hvm.c | 129 +++++++---------------------------------
xen/arch/x86/mm.c | 24 ++++++++
xen/arch/x86/physdev.c | 4 +-
xen/arch/x86/x86_64/compat/mm.c | 2 -
xen/include/asm-x86/hypercall.h | 10 ++++
5 files changed, 57 insertions(+), 112 deletions(-)
diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index b69f164..57552b9 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -3844,20 +3844,12 @@ static long hvm_grant_table_op(
static long hvm_memory_op(int cmd, XEN_GUEST_HANDLE_PARAM(void) arg)
{
- long rc;
+ long rc = do_memory_op(cmd, arg);
- switch ( cmd & MEMOP_CMD_MASK )
- {
- case XENMEM_memory_map:
- case XENMEM_machine_memory_map:
- case XENMEM_machphys_mapping:
- return -ENOSYS;
- case XENMEM_decrease_reservation:
- rc = do_memory_op(cmd, arg);
+ if ( (cmd & MEMOP_CMD_MASK) == XENMEM_decrease_reservation )
current->domain->arch.hvm_domain.qemu_mapcache_invalidate = 1;
- return rc;
- }
- return do_memory_op(cmd, arg);
+
+ return rc;
}
static long hvm_physdev_op(int cmd, XEN_GUEST_HANDLE_PARAM(void) arg)
@@ -3865,7 +3857,7 @@ static long hvm_physdev_op(int cmd,
XEN_GUEST_HANDLE_PARAM(void) arg)
switch ( cmd )
{
default:
- if ( !is_pvh_vcpu(current) || !is_hardware_domain(current->domain) )
+ if ( !is_hardware_domain(current->domain) )
return -ENOSYS;
/* fall through */
case PHYSDEVOP_map_pirq:
@@ -3877,31 +3869,6 @@ static long hvm_physdev_op(int cmd,
XEN_GUEST_HANDLE_PARAM(void) arg)
}
}
-static long hvm_vcpu_op(
- int cmd, int vcpuid, XEN_GUEST_HANDLE_PARAM(void) arg)
-{
- long rc;
-
- switch ( cmd )
- {
- case VCPUOP_register_runstate_memory_area:
- case VCPUOP_get_runstate_info:
- case VCPUOP_set_periodic_timer:
- case VCPUOP_stop_periodic_timer:
- case VCPUOP_set_singleshot_timer:
- case VCPUOP_stop_singleshot_timer:
- case VCPUOP_register_vcpu_info:
- case VCPUOP_register_vcpu_time_memory_area:
- rc = do_vcpu_op(cmd, vcpuid, arg);
- break;
- default:
- rc = -ENOSYS;
- break;
- }
-
- return rc;
-}
-
typedef unsigned long hvm_hypercall_t(
unsigned long, unsigned long, unsigned long, unsigned long, unsigned long,
unsigned long);
@@ -3920,43 +3887,10 @@ static long hvm_grant_table_op_compat32(unsigned int
cmd,
static long hvm_memory_op_compat32(int cmd, XEN_GUEST_HANDLE_PARAM(void) arg)
{
- int rc;
+ int rc = compat_memory_op(cmd, arg);
- switch ( cmd & MEMOP_CMD_MASK )
- {
- case XENMEM_memory_map:
- case XENMEM_machine_memory_map:
- case XENMEM_machphys_mapping:
- return -ENOSYS;
- case XENMEM_decrease_reservation:
- rc = compat_memory_op(cmd, arg);
+ if ( (cmd & MEMOP_CMD_MASK) == XENMEM_decrease_reservation )
current->domain->arch.hvm_domain.qemu_mapcache_invalidate = 1;
- return rc;
- }
- return compat_memory_op(cmd, arg);
-}
-
-static long hvm_vcpu_op_compat32(
- int cmd, int vcpuid, XEN_GUEST_HANDLE_PARAM(void) arg)
-{
- long rc;
-
- switch ( cmd )
- {
- case VCPUOP_register_runstate_memory_area:
- case VCPUOP_get_runstate_info:
- case VCPUOP_set_periodic_timer:
- case VCPUOP_stop_periodic_timer:
- case VCPUOP_set_singleshot_timer:
- case VCPUOP_stop_singleshot_timer:
- case VCPUOP_register_vcpu_info:
- case VCPUOP_register_vcpu_time_memory_area:
- rc = compat_vcpu_op(cmd, vcpuid, arg);
- break;
- default:
- rc = -ENOSYS;
- break;
- }
return rc;
}
@@ -3966,27 +3900,29 @@ static long hvm_physdev_op_compat32(
{
switch ( cmd )
{
+ default:
+ if ( !is_hardware_domain(current->domain) )
+ return -ENOSYS;
+ /* fall through */
case PHYSDEVOP_map_pirq:
case PHYSDEVOP_unmap_pirq:
case PHYSDEVOP_eoi:
case PHYSDEVOP_irq_status_query:
case PHYSDEVOP_get_free_pirq:
return compat_physdev_op(cmd, arg);
- break;
- default:
- return -ENOSYS;
- break;
}
}
static hvm_hypercall_t *const hvm_hypercall64_table[NR_hypercalls] = {
[ __HYPERVISOR_memory_op ] = (hvm_hypercall_t *)hvm_memory_op,
[ __HYPERVISOR_grant_table_op ] = (hvm_hypercall_t *)hvm_grant_table_op,
- [ __HYPERVISOR_vcpu_op ] = (hvm_hypercall_t *)hvm_vcpu_op,
[ __HYPERVISOR_physdev_op ] = (hvm_hypercall_t *)hvm_physdev_op,
+ HYPERCALL(platform_op),
HYPERCALL(xen_version),
HYPERCALL(console_io),
HYPERCALL(event_channel_op),
+ HYPERCALL(vcpu_op),
+ HYPERCALL(mmuext_op),
HYPERCALL(sched_op),
HYPERCALL(set_timer_op),
HYPERCALL(xsm_op),
@@ -4002,11 +3938,13 @@ static hvm_hypercall_t *const
hvm_hypercall64_table[NR_hypercalls] = {
static hvm_hypercall_t *const hvm_hypercall32_table[NR_hypercalls] = {
[ __HYPERVISOR_memory_op ] = (hvm_hypercall_t *)hvm_memory_op_compat32,
[ __HYPERVISOR_grant_table_op ] = (hvm_hypercall_t
*)hvm_grant_table_op_compat32,
- [ __HYPERVISOR_vcpu_op ] = (hvm_hypercall_t *)hvm_vcpu_op_compat32,
[ __HYPERVISOR_physdev_op ] = (hvm_hypercall_t *)hvm_physdev_op_compat32,
+ HYPERCALL(platform_op),
COMPAT_CALL(xen_version),
HYPERCALL(console_io),
HYPERCALL(event_channel_op),
+ COMPAT_CALL(vcpu_op),
+ COMPAT_CALL(mmuext_op),
COMPAT_CALL(sched_op),
COMPAT_CALL(set_timer_op),
HYPERCALL(xsm_op),
@@ -4016,24 +3954,6 @@ static hvm_hypercall_t *const
hvm_hypercall32_table[NR_hypercalls] = {
HYPERCALL(tmem_op)
};
-/* PVH 32bitfixme. */
-static hvm_hypercall_t *const pvh_hypercall64_table[NR_hypercalls] = {
- HYPERCALL(platform_op),
- HYPERCALL(memory_op),
- HYPERCALL(xen_version),
- HYPERCALL(console_io),
- [ __HYPERVISOR_grant_table_op ] = (hvm_hypercall_t *)hvm_grant_table_op,
- HYPERCALL(vcpu_op),
- HYPERCALL(mmuext_op),
- HYPERCALL(xsm_op),
- HYPERCALL(sched_op),
- HYPERCALL(event_channel_op),
- [ __HYPERVISOR_physdev_op ] = (hvm_hypercall_t *)hvm_physdev_op,
- HYPERCALL(hvm_op),
- HYPERCALL(sysctl),
- HYPERCALL(domctl)
-};
-
int hvm_do_hypercall(struct cpu_user_regs *regs)
{
struct vcpu *curr = current;
@@ -4060,9 +3980,7 @@ int hvm_do_hypercall(struct cpu_user_regs *regs)
if ( (eax & 0x80000000) && is_viridian_domain(curr->domain) )
return viridian_hypercall(regs);
- if ( (eax >= NR_hypercalls) ||
- (is_pvh_vcpu(curr) ? !pvh_hypercall64_table[eax]
- : !hvm_hypercall32_table[eax]) )
+ if ( (eax >= NR_hypercalls) || !hvm_hypercall32_table[eax] )
{
regs->eax = -ENOSYS;
return HVM_HCALL_completed;
@@ -4077,14 +3995,9 @@ int hvm_do_hypercall(struct cpu_user_regs *regs)
regs->r10, regs->r8, regs->r9);
curr->arch.hvm_vcpu.hcall_64bit = 1;
- if ( is_pvh_vcpu(curr) )
- regs->rax = pvh_hypercall64_table[eax](regs->rdi, regs->rsi,
- regs->rdx, regs->r10,
- regs->r8, regs->r9);
- else
- regs->rax = hvm_hypercall64_table[eax](regs->rdi, regs->rsi,
- regs->rdx, regs->r10,
- regs->r8, regs->r9);
+ regs->rax = hvm_hypercall64_table[eax](regs->rdi, regs->rsi,
+ regs->rdx, regs->r10,
+ regs->r8, regs->r9);
curr->arch.hvm_vcpu.hcall_64bit = 0;
}
else
diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index 1a8a5e0..a263d26 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -3253,6 +3253,12 @@ long do_mmuext_op(
case MMUEXT_CLEAR_PAGE: {
struct page_info *page;
+ if ( !is_pv_vcpu(current) )
+ {
+ okay = 0;
+ break;
+ }
+
page = get_page_from_gfn(d, op.arg1.mfn, NULL, P2M_ALLOC);
if ( !page || !get_page_type(page, PGT_writable_page) )
{
@@ -3276,6 +3282,12 @@ long do_mmuext_op(
{
struct page_info *src_page, *dst_page;
+ if ( !is_pv_vcpu(current) )
+ {
+ okay = 0;
+ break;
+ }
+
src_page = get_page_from_gfn(d, op.arg2.src_mfn, NULL, P2M_ALLOC);
if ( unlikely(!src_page) )
{
@@ -3310,6 +3322,12 @@ long do_mmuext_op(
unsigned long mfn;
struct spage_info *spage;
+ if ( paging_mode_refcounts(pg_owner) )
+ {
+ okay = 0;
+ break;
+ }
+
mfn = op.arg1.mfn;
if ( mfn & (L1_PAGETABLE_ENTRIES-1) )
{
@@ -3336,6 +3354,12 @@ long do_mmuext_op(
unsigned long mfn;
struct spage_info *spage;
+ if ( paging_mode_refcounts(pg_owner) )
+ {
+ okay = 0;
+ break;
+ }
+
mfn = op.arg1.mfn;
if ( mfn & (L1_PAGETABLE_ENTRIES-1) )
{
diff --git a/xen/arch/x86/physdev.c b/xen/arch/x86/physdev.c
index f178315..a2d2b96 100644
--- a/xen/arch/x86/physdev.c
+++ b/xen/arch/x86/physdev.c
@@ -520,7 +520,7 @@ ret_t do_physdev_op(int cmd, XEN_GUEST_HANDLE_PARAM(void)
arg)
struct physdev_set_iopl set_iopl;
ret = -ENOSYS;
- if ( is_pvh_vcpu(current) )
+ if ( !is_pv_vcpu(current) )
break;
ret = -EFAULT;
@@ -538,7 +538,7 @@ ret_t do_physdev_op(int cmd, XEN_GUEST_HANDLE_PARAM(void)
arg)
struct physdev_set_iobitmap set_iobitmap;
ret = -ENOSYS;
- if ( is_pvh_vcpu(current) )
+ if ( !is_pv_vcpu(current) )
break;
ret = -EFAULT;
diff --git a/xen/arch/x86/x86_64/compat/mm.c b/xen/arch/x86/x86_64/compat/mm.c
index 69c6195..3fa90aa 100644
--- a/xen/arch/x86/x86_64/compat/mm.c
+++ b/xen/arch/x86/x86_64/compat/mm.c
@@ -236,8 +236,6 @@ int compat_update_va_mapping_otherdomain(unsigned long va,
u32 lo, u32 hi,
return do_update_va_mapping_otherdomain(va, lo | ((u64)hi << 32), flags,
domid);
}
-DEFINE_XEN_GUEST_HANDLE(mmuext_op_compat_t);
-
int compat_mmuext_op(XEN_GUEST_HANDLE_PARAM(mmuext_op_compat_t) cmp_uops,
unsigned int count,
XEN_GUEST_HANDLE_PARAM(uint) pdone,
diff --git a/xen/include/asm-x86/hypercall.h b/xen/include/asm-x86/hypercall.h
index afa8ba9..cee8817 100644
--- a/xen/include/asm-x86/hypercall.h
+++ b/xen/include/asm-x86/hypercall.h
@@ -8,6 +8,7 @@
#include <public/physdev.h>
#include <public/arch-x86/xen-mca.h> /* for do_mca */
#include <xen/types.h>
+#include <compat/memory.h>
/*
* Both do_mmuext_op() and do_mmu_update():
@@ -110,4 +111,13 @@ extern int
arch_compat_vcpu_op(
int cmd, struct vcpu *v, XEN_GUEST_HANDLE_PARAM(void) arg);
+DEFINE_XEN_GUEST_HANDLE(mmuext_op_compat_t);
+
+extern int
+compat_mmuext_op(
+ XEN_GUEST_HANDLE_PARAM(mmuext_op_compat_t) cmp_uops,
+ unsigned int count,
+ XEN_GUEST_HANDLE_PARAM(uint) pdone,
+ unsigned int foreigndom);
+
#endif /* __ASM_X86_HYPERCALL_H__ */
--
1.8.5.2
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