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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] x86 hvm: Make a couple of hypercall state flags per-vcpu
# HG changeset patch
# User Keir Fraser <keir@xxxxxxx>
# Date 1289911355 0
# Node ID 07bbfe6dd27d51f2ace6dc1e127f899eee672ba6
# Parent 379123d8dbab42351f9ebf41bcb0a21ef8440c24
x86 hvm: Make a couple of hypercall state flags per-vcpu
This is a prerequisite for allowing guest descheduling within a
hypercall.
Signed-off-by: Keir Fraser <keir@xxxxxxx>
---
xen/arch/x86/domain.c | 12 ++++--------
xen/arch/x86/hvm/hvm.c | 26 ++++++++++++--------------
xen/include/asm-x86/hvm/guest_access.h | 3 ---
xen/include/asm-x86/hvm/vcpu.h | 3 +++
xen/include/asm-x86/hypercall.h | 9 ---------
5 files changed, 19 insertions(+), 34 deletions(-)
diff -r 379123d8dbab -r 07bbfe6dd27d xen/arch/x86/domain.c
--- a/xen/arch/x86/domain.c Tue Nov 16 11:44:09 2010 +0000
+++ b/xen/arch/x86/domain.c Tue Nov 16 12:42:35 2010 +0000
@@ -1553,8 +1553,6 @@ void sync_vcpu_execstate(struct vcpu *v)
__arg; \
})
-DEFINE_PER_CPU(char, hc_preempted);
-
unsigned long hypercall_create_continuation(
unsigned int op, const char *format, ...)
{
@@ -1583,12 +1581,12 @@ unsigned long hypercall_create_continuat
{
regs = guest_cpu_user_regs();
regs->eax = op;
- /*
- * For PV guest, we update EIP to re-execute 'syscall' / 'int 0x82';
- * HVM does not need this since 'vmcall' / 'vmmcall' is fault-like.
- */
+
+ /* Ensure the hypercall trap instruction is re-executed. */
if ( !is_hvm_vcpu(current) )
regs->eip -= 2; /* re-execute 'syscall' / 'int 0x82' */
+ else
+ current->arch.hvm_vcpu.hcall_preempted = 1;
#ifdef __x86_64__
if ( !is_hvm_vcpu(current) ?
@@ -1629,8 +1627,6 @@ unsigned long hypercall_create_continuat
}
}
}
-
- this_cpu(hc_preempted) = 1;
}
va_end(args);
diff -r 379123d8dbab -r 07bbfe6dd27d xen/arch/x86/hvm/hvm.c
--- a/xen/arch/x86/hvm/hvm.c Tue Nov 16 11:44:09 2010 +0000
+++ b/xen/arch/x86/hvm/hvm.c Tue Nov 16 12:42:35 2010 +0000
@@ -2028,16 +2028,13 @@ enum hvm_copy_result hvm_fetch_from_gues
PFEC_page_present | pfec);
}
+unsigned long copy_to_user_hvm(void *to, const void *from, unsigned int len)
+{
+ int rc;
+
#ifdef __x86_64__
-DEFINE_PER_CPU(bool_t, hvm_64bit_hcall);
-#endif
-
-unsigned long copy_to_user_hvm(void *to, const void *from, unsigned int len)
-{
- int rc;
-
-#ifdef __x86_64__
- if ( !this_cpu(hvm_64bit_hcall) && is_compat_arg_xlat_range(to, len) )
+ if ( !current->arch.hvm_vcpu.hcall_64bit &&
+ is_compat_arg_xlat_range(to, len) )
{
memcpy(to, from, len);
return 0;
@@ -2054,7 +2051,8 @@ unsigned long copy_from_user_hvm(void *t
int rc;
#ifdef __x86_64__
- if ( !this_cpu(hvm_64bit_hcall) && is_compat_arg_xlat_range(from, len) )
+ if ( !current->arch.hvm_vcpu.hcall_64bit &&
+ is_compat_arg_xlat_range(from, len) )
{
memcpy(to, from, len);
return 0;
@@ -2567,7 +2565,7 @@ int hvm_do_hypercall(struct cpu_user_reg
return HVM_HCALL_completed;
}
- this_cpu(hc_preempted) = 0;
+ curr->arch.hvm_vcpu.hcall_preempted = 0;
#ifdef __x86_64__
if ( mode == 8 )
@@ -2575,13 +2573,13 @@ int hvm_do_hypercall(struct cpu_user_reg
HVM_DBG_LOG(DBG_LEVEL_HCALL, "hcall%u(%lx, %lx, %lx, %lx, %lx)", eax,
regs->rdi, regs->rsi, regs->rdx, regs->r10, regs->r8);
- this_cpu(hvm_64bit_hcall) = 1;
+ curr->arch.hvm_vcpu.hcall_64bit = 1;
regs->rax = hvm_hypercall64_table[eax](regs->rdi,
regs->rsi,
regs->rdx,
regs->r10,
regs->r8);
- this_cpu(hvm_64bit_hcall) = 0;
+ curr->arch.hvm_vcpu.hcall_64bit = 0;
}
else
#endif
@@ -2601,7 +2599,7 @@ int hvm_do_hypercall(struct cpu_user_reg
HVM_DBG_LOG(DBG_LEVEL_HCALL, "hcall%u -> %lx",
eax, (unsigned long)regs->eax);
- if ( this_cpu(hc_preempted) )
+ if ( curr->arch.hvm_vcpu.hcall_preempted )
return HVM_HCALL_preempted;
if ( unlikely(curr->domain->arch.hvm_domain.qemu_mapcache_invalidate) &&
diff -r 379123d8dbab -r 07bbfe6dd27d xen/include/asm-x86/hvm/guest_access.h
--- a/xen/include/asm-x86/hvm/guest_access.h Tue Nov 16 11:44:09 2010 +0000
+++ b/xen/include/asm-x86/hvm/guest_access.h Tue Nov 16 12:42:35 2010 +0000
@@ -1,8 +1,5 @@
#ifndef __ASM_X86_HVM_GUEST_ACCESS_H__
#define __ASM_X86_HVM_GUEST_ACCESS_H__
-
-#include <xen/percpu.h>
-DECLARE_PER_CPU(bool_t, hvm_64bit_hcall);
unsigned long copy_to_user_hvm(void *to, const void *from, unsigned len);
unsigned long copy_from_user_hvm(void *to, const void *from, unsigned len);
diff -r 379123d8dbab -r 07bbfe6dd27d xen/include/asm-x86/hvm/vcpu.h
--- a/xen/include/asm-x86/hvm/vcpu.h Tue Nov 16 11:44:09 2010 +0000
+++ b/xen/include/asm-x86/hvm/vcpu.h Tue Nov 16 12:42:35 2010 +0000
@@ -63,6 +63,9 @@ struct hvm_vcpu {
bool_t debug_state_latch;
bool_t single_step;
+ bool_t hcall_preempted;
+ bool_t hcall_64bit;
+
u64 asid_generation;
u32 asid;
diff -r 379123d8dbab -r 07bbfe6dd27d xen/include/asm-x86/hypercall.h
--- a/xen/include/asm-x86/hypercall.h Tue Nov 16 11:44:09 2010 +0000
+++ b/xen/include/asm-x86/hypercall.h Tue Nov 16 12:42:35 2010 +0000
@@ -16,15 +16,6 @@
* invocation of do_mmu_update() is resuming a previously preempted call.
*/
#define MMU_UPDATE_PREEMPTED (~(~0U>>1))
-
-/*
- * This gets set to a non-zero value whenever hypercall_create_continuation()
- * is used (outside of multicall context; in multicall context the second call
- * from do_multicall() itself will have this effect). Internal callers of
- * hypercall handlers interested in this condition must clear the flag prior
- * to invoking the respective handler(s).
- */
-DECLARE_PER_CPU(char, hc_preempted);
extern long
do_event_channel_op_compat(
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