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| author | Christoph Egger <Christoph.Egger@amd.com> | 2012-10-23 09:14:27 +0200 |
|---|---|---|
| committer | Christoph Egger <Christoph.Egger@amd.com> | 2012-10-23 09:14:27 +0200 |
| commit | ac4687564180b1caab108e6e36b5f54e89a981d5 (patch) | |
| tree | de1d35910eb54173d6bbffdc53591f385680b390 /xen/arch/x86/hvm/svm | |
| parent | 54c0bb27e5ce61acabe9af578469d87adab9c2af (diff) | |
| download | xen-ac4687564180b1caab108e6e36b5f54e89a981d5.tar.gz xen-ac4687564180b1caab108e6e36b5f54e89a981d5.tar.bz2 xen-ac4687564180b1caab108e6e36b5f54e89a981d5.zip | |
nestedsvm: fix VMEXIT emulation
Values in regs can be newer than those in the shadow vmcb (e.g. due to
an instruction emulation right before). So use the values from regs.
Signed-off-by: Christoph Egger <Christoph.Egger@amd.com>
Acked-by: Tim Deegan <tim@xen.org>
Committed-by: Jan Beulich <jbeulich@suse.com>
Diffstat (limited to 'xen/arch/x86/hvm/svm')
| -rw-r--r-- | xen/arch/x86/hvm/svm/nestedsvm.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/xen/arch/x86/hvm/svm/nestedsvm.c b/xen/arch/x86/hvm/svm/nestedsvm.c index e48db005e6..ed0faa640f 100644 --- a/xen/arch/x86/hvm/svm/nestedsvm.c +++ b/xen/arch/x86/hvm/svm/nestedsvm.c @@ -995,7 +995,7 @@ nsvm_vmcb_guest_intercepts_trap(struct vcpu *v, unsigned int trapnr, int errcode } static int -nsvm_vmcb_prepare4vmexit(struct vcpu *v) +nsvm_vmcb_prepare4vmexit(struct vcpu *v, struct cpu_user_regs *regs) { struct nestedvcpu *nv = &vcpu_nestedhvm(v); struct nestedsvm *svm = &vcpu_nestedsvm(v); @@ -1119,17 +1119,22 @@ nsvm_vmcb_prepare4vmexit(struct vcpu *v) ns_vmcb->_dr7 = n2vmcb->_dr7; ns_vmcb->_dr6 = n2vmcb->_dr6; + /* Restore registers from regs as those values + * can be newer than in n2vmcb (e.g. due to an + * instruction emulation right before). + */ + /* RFLAGS */ - ns_vmcb->rflags = n2vmcb->rflags; + ns_vmcb->rflags = n2vmcb->rflags = regs->rflags; /* RIP */ - ns_vmcb->rip = n2vmcb->rip; + ns_vmcb->rip = n2vmcb->rip = regs->rip; /* RSP */ - ns_vmcb->rsp = n2vmcb->rsp; + ns_vmcb->rsp = n2vmcb->rsp = regs->rsp; /* RAX */ - ns_vmcb->rax = n2vmcb->rax; + ns_vmcb->rax = n2vmcb->rax = regs->rax; /* Keep the l2 guest values of the fs, gs, ldtr, tr, kerngsbase, * star, lstar, cstar, sfmask, sysenter_cs, sysenter_esp, @@ -1363,7 +1368,7 @@ nestedsvm_vmexit_n2n1(struct vcpu *v, struct cpu_user_regs *regs) ASSERT(vcpu_nestedhvm(v).nv_vmswitch_in_progress); ASSERT(nestedhvm_vcpu_in_guestmode(v)); - rc = nsvm_vmcb_prepare4vmexit(v); + rc = nsvm_vmcb_prepare4vmexit(v, regs); if (rc) ret = NESTEDHVM_VMEXIT_ERROR; |