GitHub-Mirror/Star64_linux
2
0
Fork 0
mirror of https://github.com/Fishwaldo/Star64_linux.git synced 2025-06-22 14:41:27 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

KVM: Fix mov cr0 #GP at wrong instruction

Browse source 
On Intel, we call skip_emulated_instruction() even if we injected a #GP,
resulting in the #GP pointing at the wrong address.

Fix by injecting the exception and skipping the instruction at the same place,
so we can do just one or the other.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Avi Kivity 2010-06-10 17:02:14 +03:00
parent 2acf923e38
commit 49a9b07edc
4 changed files with 16 additions and 13 deletions
Download patch file Download diff file Expand all files Collapse all files

2
arch/x86/include/asm/kvm_host.h
View file

@ -597,7 +597,7 @@ int kvm_load_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector, int seg);
int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason, int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason,
bool has_error_code, u32 error_code); bool has_error_code, u32 error_code);
void kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0); int kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
void kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3); void kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3);
void kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4); void kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4);
void kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8); void kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8);

2
arch/x86/kvm/svm.c
View file

@ -807,7 +807,7 @@ static void init_vmcb(struct vcpu_svm *svm)
* svm_set_cr0() sets PG and WP and clears NW and CD on save->cr0. * svm_set_cr0() sets PG and WP and clears NW and CD on save->cr0.
*/ */
svm->vcpu.arch.cr0 = X86_CR0_NW | X86_CR0_CD | X86_CR0_ET; svm->vcpu.arch.cr0 = X86_CR0_NW | X86_CR0_CD | X86_CR0_ET;
kvm_set_cr0(&svm->vcpu, svm->vcpu.arch.cr0); (void)kvm_set_cr0(&svm->vcpu, svm->vcpu.arch.cr0);
save->cr4 = X86_CR4_PAE; save->cr4 = X86_CR4_PAE;
/* rdx = ?? */ /* rdx = ?? */

13
arch/x86/kvm/vmx.c
View file

@ -3157,11 +3157,20 @@ vmx_patch_hypercall(struct kvm_vcpu *vcpu, unsigned char *hypercall)
hypercall[2] = 0xc1; hypercall[2] = 0xc1;
} }
static void complete_insn_gp(struct kvm_vcpu *vcpu, int err)
{
if (err)
kvm_inject_gp(vcpu, 0);
else
skip_emulated_instruction(vcpu);
}
static int handle_cr(struct kvm_vcpu *vcpu) static int handle_cr(struct kvm_vcpu *vcpu)
{ {
unsigned long exit_qualification, val; unsigned long exit_qualification, val;
int cr; int cr;
int reg; int reg;
int err;
exit_qualification = vmcs_readl(EXIT_QUALIFICATION); exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
cr = exit_qualification & 15; cr = exit_qualification & 15;
@ -3172,8 +3181,8 @@ static int handle_cr(struct kvm_vcpu *vcpu)
trace_kvm_cr_write(cr, val); trace_kvm_cr_write(cr, val);
switch (cr) { switch (cr) {
case 0: case 0:
kvm_set_cr0(vcpu, val); err = kvm_set_cr0(vcpu, val);
skip_emulated_instruction(vcpu); complete_insn_gp(vcpu, err);
return 1; return 1;
case 3: case 3:
kvm_set_cr3(vcpu, val); kvm_set_cr3(vcpu, val);

12
arch/x86/kvm/x86.c
View file

@ -425,7 +425,7 @@ out:
return changed; return changed;
} }
static int __kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0) int kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
{ {
unsigned long old_cr0 = kvm_read_cr0(vcpu); unsigned long old_cr0 = kvm_read_cr0(vcpu);
unsigned long update_bits = X86_CR0_PG | X86_CR0_WP | unsigned long update_bits = X86_CR0_PG | X86_CR0_WP |
@ -468,17 +468,11 @@ static int __kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
kvm_mmu_reset_context(vcpu); kvm_mmu_reset_context(vcpu);
return 0; return 0;
} }
void kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
{
if (__kvm_set_cr0(vcpu, cr0))
kvm_inject_gp(vcpu, 0);
}
EXPORT_SYMBOL_GPL(kvm_set_cr0); EXPORT_SYMBOL_GPL(kvm_set_cr0);
void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw) void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
{ {
kvm_set_cr0(vcpu, kvm_read_cr0_bits(vcpu, ~0x0eul) | (msw & 0x0f)); (void)kvm_set_cr0(vcpu, kvm_read_cr0_bits(vcpu, ~0x0eul) | (msw & 0x0f));
} }
EXPORT_SYMBOL_GPL(kvm_lmsw); EXPORT_SYMBOL_GPL(kvm_lmsw);
@ -3732,7 +3726,7 @@ static int emulator_set_cr(int cr, unsigned long val, struct kvm_vcpu *vcpu)
switch (cr) { switch (cr) {
case 0: case 0:
res = __kvm_set_cr0(vcpu, mk_cr_64(kvm_read_cr0(vcpu), val)); res = kvm_set_cr0(vcpu, mk_cr_64(kvm_read_cr0(vcpu), val));
break; break;
case 2: case 2:
vcpu->arch.cr2 = val; vcpu->arch.cr2 = val;