* [PATCH 0/2 v2] kvm-unit-test: nVMX: Test GUEST_BNDCFGS VM-Entry control on vmentry of nested guests
@ 2020-03-17 19:15 Krish Sadhukhan
2020-03-17 19:15 ` [PATCH 1/2 v2] kvm-unit-test: VMX: Add enum for GUEST_BNDCFGS field and LOAD_BNDCFGS vmentry control field Krish Sadhukhan
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: Krish Sadhukhan @ 2020-03-17 19:15 UTC (permalink / raw)
To: kvm; +Cc: pbonzini, jmattson, sean.j.christopherson
v1 -> v2:
Rebased to the latest Upstream repo. No other changes.
Patch# 1: Adds the required enum values to the header file
Patch# 2: Adds the test code
[PATCH 1/2 v2] kvm-unit-test: VMX: Add enum for GUEST_BNDCFGS field and LOAD_BNDCFGS
[PATCH 2/2 v2] kvm-unit-test: nVMX: Test GUEST_BNDCFGS VM-Entry control on vmentry of
x86/vmx.h | 2 ++
x86/vmx_tests.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 47 insertions(+)
Krish Sadhukhan (2):
VMX: Add enum for GUEST_BNDCFGS field and LOAD_BNDCFGS vmentry control fie
nVMX: Test GUEST_BNDCFGS VM-Entry control on vmentry of nested guests
^ permalink raw reply [flat|nested] 4+ messages in thread
* [PATCH 1/2 v2] kvm-unit-test: VMX: Add enum for GUEST_BNDCFGS field and LOAD_BNDCFGS vmentry control field
2020-03-17 19:15 [PATCH 0/2 v2] kvm-unit-test: nVMX: Test GUEST_BNDCFGS VM-Entry control on vmentry of nested guests Krish Sadhukhan
@ 2020-03-17 19:15 ` Krish Sadhukhan
2020-03-17 19:15 ` [PATCH 2/2 v2] kvm-unit-test: nVMX: Test GUEST_BNDCFGS VM-Entry control on vmentry of nested guests Krish Sadhukhan
2020-03-18 13:07 ` [PATCH 0/2 " Paolo Bonzini
2 siblings, 0 replies; 4+ messages in thread
From: Krish Sadhukhan @ 2020-03-17 19:15 UTC (permalink / raw)
To: kvm; +Cc: pbonzini, jmattson, sean.j.christopherson
Signed-off-by: Krish Sadhukhan <krish.sadhukhan@oracle.com>
---
x86/vmx.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/x86/vmx.h b/x86/vmx.h
index e6ee776..2e28ecb 100644
--- a/x86/vmx.h
+++ b/x86/vmx.h
@@ -198,6 +198,7 @@ enum Encoding {
GUEST_PAT = 0x2804ul,
GUEST_PERF_GLOBAL_CTRL = 0x2808ul,
GUEST_PDPTE = 0x280aul,
+ GUEST_BNDCFGS = 0x2812ul,
/* 64-Bit Host State */
HOST_PAT = 0x2c00ul,
@@ -400,6 +401,7 @@ enum Ctrl_ent {
ENT_LOAD_PERF = 1UL << 13,
ENT_LOAD_PAT = 1UL << 14,
ENT_LOAD_EFER = 1UL << 15,
+ ENT_LOAD_BNDCFGS = 1UL << 16
};
enum Ctrl_pin {
--
1.8.3.1
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH 2/2 v2] kvm-unit-test: nVMX: Test GUEST_BNDCFGS VM-Entry control on vmentry of nested guests
2020-03-17 19:15 [PATCH 0/2 v2] kvm-unit-test: nVMX: Test GUEST_BNDCFGS VM-Entry control on vmentry of nested guests Krish Sadhukhan
2020-03-17 19:15 ` [PATCH 1/2 v2] kvm-unit-test: VMX: Add enum for GUEST_BNDCFGS field and LOAD_BNDCFGS vmentry control field Krish Sadhukhan
@ 2020-03-17 19:15 ` Krish Sadhukhan
2020-03-18 13:07 ` [PATCH 0/2 " Paolo Bonzini
2 siblings, 0 replies; 4+ messages in thread
From: Krish Sadhukhan @ 2020-03-17 19:15 UTC (permalink / raw)
To: kvm; +Cc: pbonzini, jmattson, sean.j.christopherson
According to section "Checks on Guest Control Registers, Debug Registers,
and MSRs" in Intel SDM vol 3C, the following checks are performed on
vmentry of nested guests:
If the "load IA32_BNDCFGS" VM-entry control is 1, the following
checks are performed on the field for the IA32_BNDCFGS MSR:
— Bits reserved in the IA32_BNDCFGS MSR must be 0.
— The linear address in bits 63:12 must be canonical.
Signed-off-by: Krish Sadhukhan <krish.sadhukhan@oracle.com>
---
x86/vmx_tests.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 45 insertions(+)
diff --git a/x86/vmx_tests.c b/x86/vmx_tests.c
index 0ae0046..7a37c37 100644
--- a/x86/vmx_tests.c
+++ b/x86/vmx_tests.c
@@ -7606,6 +7606,50 @@ static void test_load_guest_pat(void)
test_pat(GUEST_PAT, "GUEST_PAT", ENT_CONTROLS, ENT_LOAD_PAT);
}
+#define MSR_IA32_BNDCFGS_RSVD_MASK 0x00000ffc
+
+/*
+ * If the “load IA32_BNDCFGS” VM-entry control is 1, the following
+ * checks are performed on the field for the IA32_BNDCFGS MSR:
+ *
+ * — Bits reserved in the IA32_BNDCFGS MSR must be 0.
+ * — The linear address in bits 63:12 must be canonical.
+ *
+ * [Intel SDM]
+ */
+static void test_load_guest_bndcfgs(void)
+{
+ u64 bndcfgs_saved = vmcs_read(GUEST_BNDCFGS);
+ u64 bndcfgs;
+
+ if (!(ctrl_enter_rev.clr & ENT_LOAD_BNDCFGS)) {
+ printf("\"Load-IA32-BNDCFGS\" entry control not supported\n");
+ return;
+ }
+
+ vmcs_clear_bits(ENT_CONTROLS, ENT_LOAD_BNDCFGS);
+
+ vmcs_write(GUEST_BNDCFGS, NONCANONICAL);
+ test_guest_state("ENT_LOAD_BNDCFGS disabled", false,
+ GUEST_BNDCFGS, "GUEST_BNDCFGS");
+ bndcfgs = bndcfgs_saved | MSR_IA32_BNDCFGS_RSVD_MASK;
+ vmcs_write(GUEST_BNDCFGS, bndcfgs);
+ test_guest_state("ENT_LOAD_BNDCFGS disabled", false,
+ GUEST_BNDCFGS, "GUEST_BNDCFGS");
+
+ vmcs_set_bits(ENT_CONTROLS, ENT_LOAD_BNDCFGS);
+
+ vmcs_write(GUEST_BNDCFGS, NONCANONICAL);
+ test_guest_state("ENT_LOAD_BNDCFGS enabled", true,
+ GUEST_BNDCFGS, "GUEST_BNDCFGS");
+ bndcfgs = bndcfgs_saved | MSR_IA32_BNDCFGS_RSVD_MASK;
+ vmcs_write(GUEST_BNDCFGS, bndcfgs);
+ test_guest_state("ENT_LOAD_BNDCFGS enabled", true,
+ GUEST_BNDCFGS, "GUEST_BNDCFGS");
+
+ vmcs_write(GUEST_BNDCFGS, bndcfgs_saved);
+}
+
/*
* Check that the virtual CPU checks the VMX Guest State Area as
* documented in the Intel SDM.
@@ -7626,6 +7670,7 @@ static void vmx_guest_state_area_test(void)
test_load_guest_pat();
test_guest_efer();
test_load_guest_perf_global_ctrl();
+ test_load_guest_bndcfgs();
/*
* Let the guest finish execution
--
1.8.3.1
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH 0/2 v2] kvm-unit-test: nVMX: Test GUEST_BNDCFGS VM-Entry control on vmentry of nested guests
2020-03-17 19:15 [PATCH 0/2 v2] kvm-unit-test: nVMX: Test GUEST_BNDCFGS VM-Entry control on vmentry of nested guests Krish Sadhukhan
2020-03-17 19:15 ` [PATCH 1/2 v2] kvm-unit-test: VMX: Add enum for GUEST_BNDCFGS field and LOAD_BNDCFGS vmentry control field Krish Sadhukhan
2020-03-17 19:15 ` [PATCH 2/2 v2] kvm-unit-test: nVMX: Test GUEST_BNDCFGS VM-Entry control on vmentry of nested guests Krish Sadhukhan
@ 2020-03-18 13:07 ` Paolo Bonzini
2 siblings, 0 replies; 4+ messages in thread
From: Paolo Bonzini @ 2020-03-18 13:07 UTC (permalink / raw)
To: Krish Sadhukhan, kvm; +Cc: jmattson, sean.j.christopherson
On 17/03/20 20:15, Krish Sadhukhan wrote:
> v1 -> v2:
> Rebased to the latest Upstream repo. No other changes.
>
>
> Patch# 1: Adds the required enum values to the header file
> Patch# 2: Adds the test code
>
> [PATCH 1/2 v2] kvm-unit-test: VMX: Add enum for GUEST_BNDCFGS field and LOAD_BNDCFGS
> [PATCH 2/2 v2] kvm-unit-test: nVMX: Test GUEST_BNDCFGS VM-Entry control on vmentry of
>
> x86/vmx.h | 2 ++
> x86/vmx_tests.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 47 insertions(+)
>
> Krish Sadhukhan (2):
> VMX: Add enum for GUEST_BNDCFGS field and LOAD_BNDCFGS vmentry control fie
> nVMX: Test GUEST_BNDCFGS VM-Entry control on vmentry of nested guests
>
Queued, thanks.
Paolo
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