Messages in this thread Patch in this message | | | From | Joerg Roedel <> | Subject | [PATCH] KVM: SVM: Add xsetbv intercept | Date | Fri, 3 Dec 2010 17:42:03 +0100 |
| |
This patch implements the xsetbv intercept to the AMD part of KVM. This makes AVX usable in a save way for the guest on AVX capable AMD hardware. The patch is tested by using AVX in the guest and host in parallel and checking for data corruption. I also used the KVM xsave unit-tests and they all pass.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> --- arch/x86/include/asm/svm.h | 2 ++ arch/x86/kvm/svm.c | 16 ++++++++++++++++ 2 files changed, 18 insertions(+), 0 deletions(-)
diff --git a/arch/x86/include/asm/svm.h b/arch/x86/include/asm/svm.h index 11dbca7..7f3a304 100644 --- a/arch/x86/include/asm/svm.h +++ b/arch/x86/include/asm/svm.h @@ -47,6 +47,7 @@ enum { INTERCEPT_MONITOR, INTERCEPT_MWAIT, INTERCEPT_MWAIT_COND, + INTERCEPT_XSETBV, }; @@ -326,6 +327,7 @@ struct __attribute__ ((__packed__)) vmcb { #define SVM_EXIT_MONITOR 0x08a #define SVM_EXIT_MWAIT 0x08b #define SVM_EXIT_MWAIT_COND 0x08c +#define SVM_EXIT_XSETBV 0x08d #define SVM_EXIT_NPF 0x400 #define SVM_EXIT_ERR -1 diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index c00ea90..9cd0c14 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -904,6 +904,7 @@ static void init_vmcb(struct vcpu_svm *svm) set_intercept(svm, INTERCEPT_WBINVD); set_intercept(svm, INTERCEPT_MONITOR); set_intercept(svm, INTERCEPT_MWAIT); + set_intercept(svm, INTERCEPT_XSETBV); control->iopm_base_pa = iopm_base; control->msrpm_base_pa = __pa(svm->msrpm); @@ -2493,6 +2494,19 @@ static int skinit_interception(struct vcpu_svm *svm) return 1; } +static int xsetbv_interception(struct vcpu_svm *svm) +{ + u64 new_bv = kvm_read_edx_eax(&svm->vcpu); + u32 index = kvm_register_read(&svm->vcpu, VCPU_REGS_RCX); + + if (kvm_set_xcr(&svm->vcpu, index, new_bv) == 0) { + svm->next_rip = kvm_rip_read(&svm->vcpu) + 3; + skip_emulated_instruction(&svm->vcpu); + } + + return 1; +} + static int invalid_op_interception(struct vcpu_svm *svm) { kvm_queue_exception(&svm->vcpu, UD_VECTOR); @@ -2916,6 +2930,7 @@ static int (*svm_exit_handlers[])(struct vcpu_svm *svm) = { [SVM_EXIT_WBINVD] = emulate_on_interception, [SVM_EXIT_MONITOR] = invalid_op_interception, [SVM_EXIT_MWAIT] = invalid_op_interception, + [SVM_EXIT_XSETBV] = xsetbv_interception, [SVM_EXIT_NPF] = pf_interception, }; @@ -3628,6 +3643,7 @@ static const struct trace_print_flags svm_exit_reasons_str[] = { { SVM_EXIT_WBINVD, "wbinvd" }, { SVM_EXIT_MONITOR, "monitor" }, { SVM_EXIT_MWAIT, "mwait" }, + { SVM_EXIT_XSETBV, "xsetbv" }, { SVM_EXIT_NPF, "npf" }, { -1, NULL } }; -- 1.7.1
| |