Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-26 06:02:05 +00:00
Code Issues Packages Projects Releases Wiki Activity

MIPS: KVM: Consult HWREna before emulating RDHWR

Browse Source 
The ability to read hardware registers from userland with the RDHWR
instruction should depend upon the corresponding bit of the HWREna
register being set, otherwise a reserved instruction exception should be
generated.

However KVM's current emulation ignores the guest's HWREna and always
emulates RDHWR instructions even if the guest OS has disallowed them.

Therefore rework the RDHWR emulation code to check for privilege or the
corresponding bit in the guest HWREna bit. Also remove the #if 0 case
for the UserLocal register. I presume it was there for debug purposes
but it seems unnecessary now that the guest can control whether it
causes a guest exception.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Gleb Natapov <gleb@kernel.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Sanjay Lal <sanjayl@kymasys.com>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
James Hogan 2014-03-14 13:06:09 +00:00 committed by Paolo Bonzini
parent 1550567936
commit 26f4f3b578
2 changed files with 18 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/mips/include/asm/kvm_host.h
View File

@ -414,6 +414,8 @@ struct kvm_vcpu_arch {
#define kvm_write_c0_guest_pagemask(cop0, val) (cop0->reg[MIPS_CP0_TLB_PG_MASK][0] = (val))
#define kvm_read_c0_guest_wired(cop0) (cop0->reg[MIPS_CP0_TLB_WIRED][0])
#define kvm_write_c0_guest_wired(cop0, val) (cop0->reg[MIPS_CP0_TLB_WIRED][0] = (val))
#define kvm_read_c0_guest_hwrena(cop0) (cop0->reg[MIPS_CP0_HWRENA][0])
#define kvm_write_c0_guest_hwrena(cop0, val) (cop0->reg[MIPS_CP0_HWRENA][0] = (val))
#define kvm_read_c0_guest_badvaddr(cop0) (cop0->reg[MIPS_CP0_BAD_VADDR][0])
#define kvm_write_c0_guest_badvaddr(cop0, val) (cop0->reg[MIPS_CP0_BAD_VADDR][0] = (val))
#define kvm_read_c0_guest_count(cop0) (cop0->reg[MIPS_CP0_COUNT][0])

30
arch/mips/kvm/kvm_mips_emul.c
View File

@ -1542,8 +1542,15 @@ kvm_mips_handle_ri(unsigned long cause, uint32_t *opc,
}
if ((inst & OPCODE) == SPEC3 && (inst & FUNC) == RDHWR) {
int usermode = !KVM_GUEST_KERNEL_MODE(vcpu);
int rd = (inst & RD) >> 11;
int rt = (inst & RT) >> 16;
/* If usermode, check RDHWR rd is allowed by guest HWREna */
if (usermode && !(kvm_read_c0_guest_hwrena(cop0) & BIT(rd))) {
kvm_debug("RDHWR %#x disallowed by HWREna @ %p\n",
rd, opc);
goto emulate_ri;
}
switch (rd) {
case 0: /* CPU number */
arch->gprs[rt] = 0;
@ -1567,32 +1574,27 @@ kvm_mips_handle_ri(unsigned long cause, uint32_t *opc,
}
break;
case 29:
#if 1
arch->gprs[rt] = kvm_read_c0_guest_userlocal(cop0);
#else
/* UserLocal not implemented */
er = EMULATE_FAIL;
#endif
break;
default:
kvm_debug("RDHWR %#x not supported @ %p\n", rd, opc);
er = EMULATE_FAIL;
break;
goto emulate_ri;
}
} else {
kvm_debug("Emulate RI not supported @ %p: %#x\n", opc, inst);
er = EMULATE_FAIL;
goto emulate_ri;
}
return EMULATE_DONE;
emulate_ri:
/*
* Rollback PC only if emulation was unsuccessful
* Rollback PC (if in branch delay slot then the PC already points to
* branch target), and pass the RI exception to the guest OS.
*/
if (er == EMULATE_FAIL) {
vcpu->arch.pc = curr_pc;
er = kvm_mips_emulate_ri_exc(cause, opc, run, vcpu);
}
return er;
vcpu->arch.pc = curr_pc;
return kvm_mips_emulate_ri_exc(cause, opc, run, vcpu);
}
enum emulation_result