File 5ef6156a-x86-disallow-access-to-PT-MSRs.patch of Package xen.16818

# Commit bcdfbb70fca579baa04f212c0936b77919bdae11
# Date 2020-06-26 16:34:02 +0100
# Author Andrew Cooper <andrew.cooper3@citrix.com>
# Committer Andrew Cooper <andrew.cooper3@citrix.com>
x86/msr: Disallow access to Processor Trace MSRs

We do not expose the feature to guests, so should disallow access to the
respective MSRs.  For simplicity, drop the entire block of MSRs, not just the
subset which have been specified thus far.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Wei Liu <wl@xen.org>
Reviewed-by: Jan Beulich <jbeulich@suse.com>

--- a/xen/arch/x86/msr.c
+++ b/xen/arch/x86/msr.c
@@ -135,6 +135,7 @@ int guest_rdmsr(struct vcpu *v, uint32_t
     case MSR_TSX_FORCE_ABORT:
     case MSR_TSX_CTRL:
     case MSR_MCU_OPT_CTRL:
+    case MSR_RTIT_OUTPUT_BASE ... MSR_RTIT_ADDR_B(7):
     case MSR_U_CET:
     case MSR_S_CET:
     case MSR_PL0_SSP ... MSR_INTERRUPT_SSP_TABLE:
@@ -290,6 +291,7 @@ int guest_wrmsr(struct vcpu *v, uint32_t
     case MSR_TSX_FORCE_ABORT:
     case MSR_TSX_CTRL:
     case MSR_MCU_OPT_CTRL:
+    case MSR_RTIT_OUTPUT_BASE ... MSR_RTIT_ADDR_B(7):
     case MSR_U_CET:
     case MSR_S_CET:
     case MSR_PL0_SSP ... MSR_INTERRUPT_SSP_TABLE:
--- a/xen/include/asm-x86/msr-index.h
+++ b/xen/include/asm-x86/msr-index.h
@@ -182,6 +182,14 @@
 #define MSR_MCU_OPT_CTRL                    0x00000123
 #define  MCU_OPT_CTRL_RNGDS_MITG_DIS        (_AC(1, ULL) <<  0)
 
+#define MSR_RTIT_OUTPUT_BASE                0x00000560
+#define MSR_RTIT_OUTPUT_MASK                0x00000561
+#define MSR_RTIT_CTL                        0x00000570
+#define MSR_RTIT_STATUS                     0x00000571
+#define MSR_RTIT_CR3_MATCH                  0x00000572
+#define MSR_RTIT_ADDR_A(n)                 (0x00000580 + (n) * 2)
+#define MSR_RTIT_ADDR_B(n)                 (0x00000581 + (n) * 2)
+
 #define MSR_U_CET                           0x000006a0
 #define MSR_S_CET                           0x000006a2
 #define MSR_PL0_SSP                         0x000006a4