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authorSean Christopherson <seanjc@google.com>2021-11-09 22:23:49 +0000
committerPaolo Bonzini <pbonzini@redhat.com>2021-12-05 03:02:03 -0500
commit75236f5f2299b502e4b9b267c1ce3bc14a222ceb (patch)
treecd975d129d4ce75408f5e5394815eeb674fb6895 /arch
parenta955cad84cdaffa282b3cf8f5ce69e9e5655e585 (diff)
KVM: SEV: Return appropriate error codes if SEV-ES scratch setup fails
Return appropriate error codes if setting up the GHCB scratch area for an SEV-ES guest fails. In particular, returning -EINVAL instead of -ENOMEM when allocating the kernel buffer could be confusing as userspace would likely suspect a guest issue. Fixes: 8f423a80d299 ("KVM: SVM: Support MMIO for an SEV-ES guest") Cc: Tom Lendacky <thomas.lendacky@amd.com> Signed-off-by: Sean Christopherson <seanjc@google.com> Message-Id: <20211109222350.2266045-2-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kvm/svm/sev.c30
1 files changed, 17 insertions, 13 deletions
diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
index 59727a966f90..f35f59bfdb41 100644
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -2530,7 +2530,7 @@ void pre_sev_run(struct vcpu_svm *svm, int cpu)
}
#define GHCB_SCRATCH_AREA_LIMIT (16ULL * PAGE_SIZE)
-static bool setup_vmgexit_scratch(struct vcpu_svm *svm, bool sync, u64 len)
+static int setup_vmgexit_scratch(struct vcpu_svm *svm, bool sync, u64 len)
{
struct vmcb_control_area *control = &svm->vmcb->control;
struct ghcb *ghcb = svm->sev_es.ghcb;
@@ -2541,14 +2541,14 @@ static bool setup_vmgexit_scratch(struct vcpu_svm *svm, bool sync, u64 len)
scratch_gpa_beg = ghcb_get_sw_scratch(ghcb);
if (!scratch_gpa_beg) {
pr_err("vmgexit: scratch gpa not provided\n");
- return false;
+ return -EINVAL;
}
scratch_gpa_end = scratch_gpa_beg + len;
if (scratch_gpa_end < scratch_gpa_beg) {
pr_err("vmgexit: scratch length (%#llx) not valid for scratch address (%#llx)\n",
len, scratch_gpa_beg);
- return false;
+ return -EINVAL;
}
if ((scratch_gpa_beg & PAGE_MASK) == control->ghcb_gpa) {
@@ -2566,7 +2566,7 @@ static bool setup_vmgexit_scratch(struct vcpu_svm *svm, bool sync, u64 len)
scratch_gpa_end > ghcb_scratch_end) {
pr_err("vmgexit: scratch area is outside of GHCB shared buffer area (%#llx - %#llx)\n",
scratch_gpa_beg, scratch_gpa_end);
- return false;
+ return -EINVAL;
}
scratch_va = (void *)svm->sev_es.ghcb;
@@ -2579,18 +2579,18 @@ static bool setup_vmgexit_scratch(struct vcpu_svm *svm, bool sync, u64 len)
if (len > GHCB_SCRATCH_AREA_LIMIT) {
pr_err("vmgexit: scratch area exceeds KVM limits (%#llx requested, %#llx limit)\n",
len, GHCB_SCRATCH_AREA_LIMIT);
- return false;
+ return -EINVAL;
}
scratch_va = kzalloc(len, GFP_KERNEL_ACCOUNT);
if (!scratch_va)
- return false;
+ return -ENOMEM;
if (kvm_read_guest(svm->vcpu.kvm, scratch_gpa_beg, scratch_va, len)) {
/* Unable to copy scratch area from guest */
pr_err("vmgexit: kvm_read_guest for scratch area failed\n");
kfree(scratch_va);
- return false;
+ return -EFAULT;
}
/*
@@ -2606,7 +2606,7 @@ static bool setup_vmgexit_scratch(struct vcpu_svm *svm, bool sync, u64 len)
svm->sev_es.ghcb_sa = scratch_va;
svm->sev_es.ghcb_sa_len = len;
- return true;
+ return 0;
}
static void set_ghcb_msr_bits(struct vcpu_svm *svm, u64 value, u64 mask,
@@ -2745,10 +2745,10 @@ int sev_handle_vmgexit(struct kvm_vcpu *vcpu)
ghcb_set_sw_exit_info_1(ghcb, 0);
ghcb_set_sw_exit_info_2(ghcb, 0);
- ret = -EINVAL;
switch (exit_code) {
case SVM_VMGEXIT_MMIO_READ:
- if (!setup_vmgexit_scratch(svm, true, control->exit_info_2))
+ ret = setup_vmgexit_scratch(svm, true, control->exit_info_2);
+ if (ret)
break;
ret = kvm_sev_es_mmio_read(vcpu,
@@ -2757,7 +2757,8 @@ int sev_handle_vmgexit(struct kvm_vcpu *vcpu)
svm->sev_es.ghcb_sa);
break;
case SVM_VMGEXIT_MMIO_WRITE:
- if (!setup_vmgexit_scratch(svm, false, control->exit_info_2))
+ ret = setup_vmgexit_scratch(svm, false, control->exit_info_2);
+ if (ret)
break;
ret = kvm_sev_es_mmio_write(vcpu,
@@ -2800,6 +2801,7 @@ int sev_handle_vmgexit(struct kvm_vcpu *vcpu)
vcpu_unimpl(vcpu,
"vmgexit: unsupported event - exit_info_1=%#llx, exit_info_2=%#llx\n",
control->exit_info_1, control->exit_info_2);
+ ret = -EINVAL;
break;
default:
ret = svm_invoke_exit_handler(vcpu, exit_code);
@@ -2812,6 +2814,7 @@ int sev_es_string_io(struct vcpu_svm *svm, int size, unsigned int port, int in)
{
int count;
int bytes;
+ int r;
if (svm->vmcb->control.exit_info_2 > INT_MAX)
return -EINVAL;
@@ -2820,8 +2823,9 @@ int sev_es_string_io(struct vcpu_svm *svm, int size, unsigned int port, int in)
if (unlikely(check_mul_overflow(count, size, &bytes)))
return -EINVAL;
- if (!setup_vmgexit_scratch(svm, in, bytes))
- return -EINVAL;
+ r = setup_vmgexit_scratch(svm, in, bytes);
+ if (r)
+ return r;
return kvm_sev_es_string_io(&svm->vcpu, size, port, svm->sev_es.ghcb_sa,
count, in);