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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] hvm svm: Avoid intercepts when accessing a number of architectural MSRs.
# HG changeset patch
# User kfraser@xxxxxxxxxxxxxxxxxxxxx
# Date 1175684248 -3600
# Node ID bc43ac9631e3cca3c6ba8467d028d252584dd502
# Parent c278b1c580db2a5d04066b9e2443a49e796e1e73
hvm svm: Avoid intercepts when accessing a number of architectural MSRs.
1. Removes intercept of guest-specific MSRs
MSR_IA32_SYSENTER_{CS,ESP,EIP}, MSR_{L,C,}STAR, MSR_SYSCALL_MASK,
MSR_SHADOW_GS_BASE.
2. Removes code to deal with those intercepts, as well as the
FS/GS-base. Since long_mode_do_msr_read now became essentially a
switch of a single case + default, I removed the entire function and
inlined the remaining single case-statement into the original
MSR-access function.
Signed-off-by: Mats Petersson <mats.petersson@xxxxxxx>
---
xen/arch/x86/hvm/svm/svm.c | 125 +-------------------------------------------
xen/arch/x86/hvm/svm/vmcb.c | 8 ++
2 files changed, 12 insertions(+), 121 deletions(-)
diff -r c278b1c580db -r bc43ac9631e3 xen/arch/x86/hvm/svm/svm.c
--- a/xen/arch/x86/hvm/svm/svm.c Wed Apr 04 11:49:37 2007 +0100
+++ b/xen/arch/x86/hvm/svm/svm.c Wed Apr 04 11:57:28 2007 +0100
@@ -131,66 +131,6 @@ static void svm_store_cpu_guest_regs(
}
}
-
-static inline int long_mode_do_msr_read(struct cpu_user_regs *regs)
-{
- u64 msr_content = 0;
- struct vcpu *v = current;
- struct vmcb_struct *vmcb = v->arch.hvm_svm.vmcb;
-
- switch ((u32)regs->ecx)
- {
- case MSR_EFER:
- msr_content = v->arch.hvm_svm.cpu_shadow_efer;
- break;
-
-#ifdef __x86_64__
- case MSR_FS_BASE:
- msr_content = vmcb->fs.base;
- goto check_long_mode;
-
- case MSR_GS_BASE:
- msr_content = vmcb->gs.base;
- goto check_long_mode;
-
- case MSR_SHADOW_GS_BASE:
- msr_content = vmcb->kerngsbase;
- check_long_mode:
- if ( !svm_long_mode_enabled(v) )
- {
- svm_inject_exception(v, TRAP_gp_fault, 1, 0);
- return 0;
- }
- break;
-#endif
-
- case MSR_STAR:
- msr_content = vmcb->star;
- break;
-
- case MSR_LSTAR:
- msr_content = vmcb->lstar;
- break;
-
- case MSR_CSTAR:
- msr_content = vmcb->cstar;
- break;
-
- case MSR_SYSCALL_MASK:
- msr_content = vmcb->sfmask;
- break;
- default:
- return 0;
- }
-
- HVM_DBG_LOG(DBG_LEVEL_2, "msr_content: %"PRIx64"\n",
- msr_content);
-
- regs->eax = (u32)(msr_content >> 0);
- regs->edx = (u32)(msr_content >> 32);
- return 1;
-}
-
static inline int long_mode_do_msr_write(struct cpu_user_regs *regs)
{
u64 msr_content = (u32)regs->eax | ((u64)regs->edx << 32);
@@ -242,52 +182,12 @@ static inline int long_mode_do_msr_write
break;
-#ifdef __x86_64__
- case MSR_FS_BASE:
- case MSR_GS_BASE:
- case MSR_SHADOW_GS_BASE:
- if ( !svm_long_mode_enabled(v) )
- goto gp_fault;
-
- if ( !is_canonical_address(msr_content) )
- goto uncanonical_address;
-
- if ( ecx == MSR_FS_BASE )
- vmcb->fs.base = msr_content;
- else if ( ecx == MSR_GS_BASE )
- vmcb->gs.base = msr_content;
- else
- vmcb->kerngsbase = msr_content;
- break;
-#endif
-
- case MSR_STAR:
- vmcb->star = msr_content;
- break;
-
- case MSR_LSTAR:
- case MSR_CSTAR:
- if ( !is_canonical_address(msr_content) )
- goto uncanonical_address;
-
- if ( ecx == MSR_LSTAR )
- vmcb->lstar = msr_content;
- else
- vmcb->cstar = msr_content;
- break;
-
- case MSR_SYSCALL_MASK:
- vmcb->sfmask = msr_content;
- break;
-
default:
return 0;
}
return 1;
- uncanonical_address:
- HVM_DBG_LOG(DBG_LEVEL_1, "Not cano address of msr write %x\n", ecx);
gp_fault:
svm_inject_exception(v, TRAP_gp_fault, 1, 0);
return 0;
@@ -2013,22 +1913,14 @@ static inline void svm_do_msr_access(
case MSR_IA32_TIME_STAMP_COUNTER:
msr_content = hvm_get_guest_time(v);
break;
- case MSR_IA32_SYSENTER_CS:
- msr_content = vmcb->sysenter_cs;
- break;
- case MSR_IA32_SYSENTER_ESP:
- msr_content = vmcb->sysenter_esp;
- break;
- case MSR_IA32_SYSENTER_EIP:
- msr_content = vmcb->sysenter_eip;
- break;
case MSR_IA32_APICBASE:
msr_content = vcpu_vlapic(v)->hw.apic_base_msr;
break;
+ case MSR_EFER:
+ msr_content = v->arch.hvm_svm.cpu_shadow_efer;
+ break;
+
default:
- if (long_mode_do_msr_read(regs))
- goto done;
-
if ( rdmsr_hypervisor_regs(ecx, &eax, &edx) ||
rdmsr_safe(ecx, eax, edx) == 0 )
{
@@ -2060,15 +1952,6 @@ static inline void svm_do_msr_access(
case MSR_IA32_TIME_STAMP_COUNTER:
hvm_set_guest_time(v, msr_content);
pt_reset(v);
- break;
- case MSR_IA32_SYSENTER_CS:
- vmcb->sysenter_cs = msr_content;
- break;
- case MSR_IA32_SYSENTER_ESP:
- vmcb->sysenter_esp = msr_content;
- break;
- case MSR_IA32_SYSENTER_EIP:
- vmcb->sysenter_eip = msr_content;
break;
case MSR_IA32_APICBASE:
vlapic_msr_set(vcpu_vlapic(v), msr_content);
diff -r c278b1c580db -r bc43ac9631e3 xen/arch/x86/hvm/svm/vmcb.c
--- a/xen/arch/x86/hvm/svm/vmcb.c Wed Apr 04 11:49:37 2007 +0100
+++ b/xen/arch/x86/hvm/svm/vmcb.c Wed Apr 04 11:57:28 2007 +0100
@@ -141,6 +141,14 @@ static int construct_vmcb(struct vcpu *v
disable_intercept_for_msr((char *)arch_svm->msrpm, MSR_FS_BASE);
disable_intercept_for_msr((char *)arch_svm->msrpm, MSR_GS_BASE);
+ disable_intercept_for_msr((char *)arch_svm->msrpm, MSR_SHADOW_GS_BASE);
+ disable_intercept_for_msr((char *)arch_svm->msrpm, MSR_CSTAR);
+ disable_intercept_for_msr((char *)arch_svm->msrpm, MSR_LSTAR);
+ disable_intercept_for_msr((char *)arch_svm->msrpm, MSR_STAR);
+ disable_intercept_for_msr((char *)arch_svm->msrpm, MSR_SYSCALL_MASK);
+ disable_intercept_for_msr((char *)arch_svm->msrpm, MSR_IA32_SYSENTER_CS);
+ disable_intercept_for_msr((char *)arch_svm->msrpm, MSR_IA32_SYSENTER_ESP);
+ disable_intercept_for_msr((char *)arch_svm->msrpm, MSR_IA32_SYSENTER_EIP);
vmcb->msrpm_base_pa = (u64)virt_to_maddr(arch_svm->msrpm);
vmcb->iopm_base_pa = (u64)virt_to_maddr(hvm_io_bitmap);
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