The primary goal of this series is to clean up the VMX MSR macros and their
usage in KVM.
The first half of the series touches memtype code that (obviously) impacts
areas well outside of KVM, in order to address several warts:
(a) KVM is defining VMX specific macros for the architectural memtypes
(b) the PAT and MTRR code define similar, yet different macros
(c) that the PAT code not only has macros for the types (well, enums),
it also has macros for encoding the entire PAT MSR that can be used
by KVM.
The memtype changes aren't strictly required for the KVM-focused changes in
the second half of the series, but splitting this into two series would
generating a number of conflicts that would be cumbersome to resolve after
the fact.
I would like to take this through the KVM tree, as I don't expect the PAT/MTRR
code to see much change in the near future, and IIRC the original motiviation
of the VMX MSR cleanups was to prepare for KVM feature enabling (FRED maybe?).
Based on:
git://git.kernel.org/pub/scm/virt/kvm/kvm.git queue
v7:
- Collect reviews.
- Fix an Author misattribution issue. [Xiaoyao]
- Add vmx_basic_encode_vmcs_info() to avoid ending up with a mix of open-coded
shift/masks and #defined shift/masks. [Xiaoyao]
- Remove an "#undef PAT" that got left behind. [Kai]
v6:
- https://lore.kernel.org/all/[email protected]
- Add all the PAT/memtype patches.
- Split the VMX changes into more appropriately sized chunks.
- Multiple minor modifications to make the macro mess more maintainable
(and yes, I edited that sentence to use "modifications" specifically
for alliteration purposes).
v5:
* https://lore.kernel.org/all/[email protected]
* Do not split VMX_BASIC bit definitions across multiple files (Kai
Huang).
* Put some words to the changelog to justify changes around memory
type macros (Kai Huang).
* Remove a leftover ';' (Kai Huang).
v4:
* Remove vmx_basic_vmcs_basic_cap() (Kai Huang).
* Add 2 macros VMX_BASIC_VMCS12_SIZE and VMX_BASIC_MEM_TYPE_WB to
avoid keeping 2 their bit shift macros (Kai Huang).
v3:
* Simply save the full/raw value of MSR_IA32_VMX_BASIC in the global
vmcs_config, and then use the helpers to extract info from it as
needed (Sean Christopherson).
* Move all VMX_MISC related changes to the second patch (Kai Huang).
* Commonize memory type definitions used in the VMX files, as memory
types are architectural.
v2:
* Don't add field shift macros unless it's really needed, extra layer
of indirect makes it harder to read (Sean Christopherson).
* Add a static_assert() to ensure that VMX_BASIC_FEATURES_MASK doesn't
overlap with VMX_BASIC_RESERVED_BITS (Sean Christopherson).
* read MSR_IA32_VMX_BASIC into an u64 rather than 2 u32 (Sean
Christopherson).
* Add 2 new functions for extracting fields from VMX basic (Sean
Christopherson).
* Drop the tools header update (Sean Christopherson).
* Move VMX basic field macros to arch/x86/include/asm/vmx.h.
Sean Christopherson (5):
x86/cpu: KVM: Add common defines for architectural memory types (PAT,
MTRRs, etc.)
x86/cpu: KVM: Move macro to encode PAT value to common header
KVM: x86: Stuff vCPU's PAT with default value at RESET, not creation
KVM: nVMX: Add a helper to encode VMCS info in MSR_IA32_VMX_BASIC
KVM VMX: Move MSR_IA32_VMX_MISC bit defines to asm/vmx.h
Xin Li (5):
KVM: VMX: Move MSR_IA32_VMX_BASIC bit defines to asm/vmx.h
KVM: VMX: Track CPU's MSR_IA32_VMX_BASIC as a single 64-bit value
KVM: nVMX: Use macros and #defines in vmx_restore_vmx_basic()
KVM: VMX: Open code VMX preemption timer rate mask in its accessor
KVM: nVMX: Use macros and #defines in vmx_restore_vmx_misc()
arch/x86/include/asm/msr-index.h | 34 ++++++++++--------
arch/x86/include/asm/vmx.h | 40 +++++++++++++++------
arch/x86/kernel/cpu/mtrr/mtrr.c | 6 ++++
arch/x86/kvm/vmx/capabilities.h | 10 +++---
arch/x86/kvm/vmx/nested.c | 62 +++++++++++++++++++++-----------
arch/x86/kvm/vmx/nested.h | 2 +-
arch/x86/kvm/vmx/vmx.c | 30 ++++++++--------
arch/x86/kvm/x86.c | 4 +--
arch/x86/kvm/x86.h | 3 +-
arch/x86/mm/pat/memtype.c | 36 ++++++-------------
10 files changed, 132 insertions(+), 95 deletions(-)
base-commit: 4aad0b1893a141f114ba40ed509066f3c9bc24b0
--
2.45.0.215.g3402c0e53f-goog
Add defines for the architectural memory types that can be shoved into
various MSRs and registers, e.g. MTRRs, PAT, VMX capabilities MSRs, EPTPs,
etc. While most MSRs/registers support only a subset of all memory types,
the values themselves are architectural and identical across all users.
Leave the goofy MTRR_TYPE_* definitions as-is since they are in a uapi
header, but add compile-time assertions to connect the dots (and sanity
check that the msr-index.h values didn't get fat-fingered).
Keep the VMX_EPTP_MT_* defines so that it's slightly more obvious that the
EPTP holds a single memory type in 3 of its 64 bits; those bits just
happen to be 2:0, i.e. don't need to be shifted.
Opportunistically use X86_MEMTYPE_WB instead of an open coded '6' in
setup_vmcs_config().
No functional change intended.
Signed-off-by: Sean Christopherson <[email protected]>
---
arch/x86/include/asm/msr-index.h | 15 ++++++++++++++-
arch/x86/include/asm/vmx.h | 5 +++--
arch/x86/kernel/cpu/mtrr/mtrr.c | 6 ++++++
arch/x86/kvm/vmx/nested.c | 2 +-
arch/x86/kvm/vmx/vmx.c | 2 +-
arch/x86/mm/pat/memtype.c | 33 ++++++++++++--------------------
6 files changed, 37 insertions(+), 26 deletions(-)
diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index e72c2b872957..3ea00500a263 100644
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -36,6 +36,20 @@
#define EFER_FFXSR (1<<_EFER_FFXSR)
#define EFER_AUTOIBRS (1<<_EFER_AUTOIBRS)
+/*
+ * Architectural memory types that are common to MTRRs, PAT, VMX MSRs, etc.
+ * Most MSRs support/allow only a subset of memory types, but the values
+ * themselves are common across all relevant MSRs.
+ */
+#define X86_MEMTYPE_UC 0ull /* Uncacheable, a.k.a. Strong Uncacheable */
+#define X86_MEMTYPE_WC 1ull /* Write Combining */
+/* RESERVED 2 */
+/* RESERVED 3 */
+#define X86_MEMTYPE_WT 4ull /* Write Through */
+#define X86_MEMTYPE_WP 5ull /* Write Protected */
+#define X86_MEMTYPE_WB 6ull /* Write Back */
+#define X86_MEMTYPE_UC_MINUS 7ull /* Weak Uncacheabled (PAT only) */
+
/* FRED MSRs */
#define MSR_IA32_FRED_RSP0 0x1cc /* Level 0 stack pointer */
#define MSR_IA32_FRED_RSP1 0x1cd /* Level 1 stack pointer */
@@ -1154,7 +1168,6 @@
#define VMX_BASIC_64 0x0001000000000000LLU
#define VMX_BASIC_MEM_TYPE_SHIFT 50
#define VMX_BASIC_MEM_TYPE_MASK 0x003c000000000000LLU
-#define VMX_BASIC_MEM_TYPE_WB 6LLU
#define VMX_BASIC_INOUT 0x0040000000000000LLU
/* Resctrl MSRs: */
diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
index d77a31039f24..e531d8d80a11 100644
--- a/arch/x86/include/asm/vmx.h
+++ b/arch/x86/include/asm/vmx.h
@@ -508,9 +508,10 @@ enum vmcs_field {
#define VMX_EPTP_PWL_4 0x18ull
#define VMX_EPTP_PWL_5 0x20ull
#define VMX_EPTP_AD_ENABLE_BIT (1ull << 6)
+/* The EPTP memtype is encoded in bits 2:0, i.e. doesn't need to be shifted. */
#define VMX_EPTP_MT_MASK 0x7ull
-#define VMX_EPTP_MT_WB 0x6ull
-#define VMX_EPTP_MT_UC 0x0ull
+#define VMX_EPTP_MT_WB X86_MEMTYPE_WB
+#define VMX_EPTP_MT_UC X86_MEMTYPE_UC
#define VMX_EPT_READABLE_MASK 0x1ull
#define VMX_EPT_WRITABLE_MASK 0x2ull
#define VMX_EPT_EXECUTABLE_MASK 0x4ull
diff --git a/arch/x86/kernel/cpu/mtrr/mtrr.c b/arch/x86/kernel/cpu/mtrr/mtrr.c
index 767bf1c71aad..125e36010b82 100644
--- a/arch/x86/kernel/cpu/mtrr/mtrr.c
+++ b/arch/x86/kernel/cpu/mtrr/mtrr.c
@@ -55,6 +55,12 @@
#include "mtrr.h"
+static_assert(X86_MEMTYPE_UC == MTRR_TYPE_UNCACHABLE);
+static_assert(X86_MEMTYPE_WC == MTRR_TYPE_WRCOMB);
+static_assert(X86_MEMTYPE_WT == MTRR_TYPE_WRTHROUGH);
+static_assert(X86_MEMTYPE_WP == MTRR_TYPE_WRPROT);
+static_assert(X86_MEMTYPE_WB == MTRR_TYPE_WRBACK);
+
/* arch_phys_wc_add returns an MTRR register index plus this offset. */
#define MTRR_TO_PHYS_WC_OFFSET 1000
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index d5b832126e34..804e9240889a 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -7028,7 +7028,7 @@ static void nested_vmx_setup_basic(struct nested_vmx_msrs *msrs)
VMCS12_REVISION |
VMX_BASIC_TRUE_CTLS |
((u64)VMCS12_SIZE << VMX_BASIC_VMCS_SIZE_SHIFT) |
- (VMX_BASIC_MEM_TYPE_WB << VMX_BASIC_MEM_TYPE_SHIFT);
+ (X86_MEMTYPE_WB << VMX_BASIC_MEM_TYPE_SHIFT);
if (cpu_has_vmx_basic_inout())
msrs->basic |= VMX_BASIC_INOUT;
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 51b2cd13250a..7dd76d04b4b0 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -2712,7 +2712,7 @@ static int setup_vmcs_config(struct vmcs_config *vmcs_conf,
#endif
/* Require Write-Back (WB) memory type for VMCS accesses. */
- if (((vmx_msr_high >> 18) & 15) != 6)
+ if (((vmx_msr_high >> 18) & 15) != X86_MEMTYPE_WB)
return -EIO;
rdmsrl(MSR_IA32_VMX_MISC, misc_msr);
diff --git a/arch/x86/mm/pat/memtype.c b/arch/x86/mm/pat/memtype.c
index 36b603d0cdde..0417368011c4 100644
--- a/arch/x86/mm/pat/memtype.c
+++ b/arch/x86/mm/pat/memtype.c
@@ -175,15 +175,6 @@ static inline void set_page_memtype(struct page *pg,
}
#endif
-enum {
- PAT_UC = 0, /* uncached */
- PAT_WC = 1, /* Write combining */
- PAT_WT = 4, /* Write Through */
- PAT_WP = 5, /* Write Protected */
- PAT_WB = 6, /* Write Back (default) */
- PAT_UC_MINUS = 7, /* UC, but can be overridden by MTRR */
-};
-
#define CM(c) (_PAGE_CACHE_MODE_ ## c)
static enum page_cache_mode __init pat_get_cache_mode(unsigned int pat_val,
@@ -193,13 +184,13 @@ static enum page_cache_mode __init pat_get_cache_mode(unsigned int pat_val,
char *cache_mode;
switch (pat_val) {
- case PAT_UC: cache = CM(UC); cache_mode = "UC "; break;
- case PAT_WC: cache = CM(WC); cache_mode = "WC "; break;
- case PAT_WT: cache = CM(WT); cache_mode = "WT "; break;
- case PAT_WP: cache = CM(WP); cache_mode = "WP "; break;
- case PAT_WB: cache = CM(WB); cache_mode = "WB "; break;
- case PAT_UC_MINUS: cache = CM(UC_MINUS); cache_mode = "UC- "; break;
- default: cache = CM(WB); cache_mode = "WB "; break;
+ case X86_MEMTYPE_UC: cache = CM(UC); cache_mode = "UC "; break;
+ case X86_MEMTYPE_WC: cache = CM(WC); cache_mode = "WC "; break;
+ case X86_MEMTYPE_WT: cache = CM(WT); cache_mode = "WT "; break;
+ case X86_MEMTYPE_WP: cache = CM(WP); cache_mode = "WP "; break;
+ case X86_MEMTYPE_WB: cache = CM(WB); cache_mode = "WB "; break;
+ case X86_MEMTYPE_UC_MINUS: cache = CM(UC_MINUS); cache_mode = "UC- "; break;
+ default: cache = CM(WB); cache_mode = "WB "; break;
}
memcpy(msg, cache_mode, 4);
@@ -256,11 +247,11 @@ void pat_cpu_init(void)
void __init pat_bp_init(void)
{
struct cpuinfo_x86 *c = &boot_cpu_data;
-#define PAT(p0, p1, p2, p3, p4, p5, p6, p7) \
- (((u64)PAT_ ## p0) | ((u64)PAT_ ## p1 << 8) | \
- ((u64)PAT_ ## p2 << 16) | ((u64)PAT_ ## p3 << 24) | \
- ((u64)PAT_ ## p4 << 32) | ((u64)PAT_ ## p5 << 40) | \
- ((u64)PAT_ ## p6 << 48) | ((u64)PAT_ ## p7 << 56))
+#define PAT(p0, p1, p2, p3, p4, p5, p6, p7) \
+ ((X86_MEMTYPE_ ## p0) | (X86_MEMTYPE_ ## p1 << 8) | \
+ (X86_MEMTYPE_ ## p2 << 16) | (X86_MEMTYPE_ ## p3 << 24) | \
+ (X86_MEMTYPE_ ## p4 << 32) | (X86_MEMTYPE_ ## p5 << 40) | \
+ (X86_MEMTYPE_ ## p6 << 48) | (X86_MEMTYPE_ ## p7 << 56))
if (!IS_ENABLED(CONFIG_X86_PAT))
--
2.45.0.215.g3402c0e53f-goog
Move pat/memtype.c's PAT() macro to msr-index.h as PAT_VALUE(), and use it
in KVM to define the default (Power-On / RESET) PAT value instead of open
coding an inscrutable magic number.
No functional change intended.
Reviewed-by: Xiaoyao Li <[email protected]>
Reviewed-by: Kai Huang <[email protected]>
Signed-off-by: Sean Christopherson <[email protected]>
---
arch/x86/include/asm/msr-index.h | 6 ++++++
arch/x86/kvm/x86.h | 3 ++-
arch/x86/mm/pat/memtype.c | 13 +++----------
3 files changed, 11 insertions(+), 11 deletions(-)
diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index 3ea00500a263..b14434af00df 100644
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -378,6 +378,12 @@
#define MSR_IA32_CR_PAT 0x00000277
+#define PAT_VALUE(p0, p1, p2, p3, p4, p5, p6, p7) \
+ ((X86_MEMTYPE_ ## p0) | (X86_MEMTYPE_ ## p1 << 8) | \
+ (X86_MEMTYPE_ ## p2 << 16) | (X86_MEMTYPE_ ## p3 << 24) | \
+ (X86_MEMTYPE_ ## p4 << 32) | (X86_MEMTYPE_ ## p5 << 40) | \
+ (X86_MEMTYPE_ ## p6 << 48) | (X86_MEMTYPE_ ## p7 << 56))
+
#define MSR_IA32_DEBUGCTLMSR 0x000001d9
#define MSR_IA32_LASTBRANCHFROMIP 0x000001db
#define MSR_IA32_LASTBRANCHTOIP 0x000001dc
diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
index d80a4c6b5a38..3a1274371f22 100644
--- a/arch/x86/kvm/x86.h
+++ b/arch/x86/kvm/x86.h
@@ -89,7 +89,8 @@ static inline unsigned int __shrink_ple_window(unsigned int val,
return max(val, min);
}
-#define MSR_IA32_CR_PAT_DEFAULT 0x0007040600070406ULL
+#define MSR_IA32_CR_PAT_DEFAULT \
+ PAT_VALUE(WB, WT, UC_MINUS, UC, WB, WT, UC_MINUS, UC)
void kvm_service_local_tlb_flush_requests(struct kvm_vcpu *vcpu);
int kvm_check_nested_events(struct kvm_vcpu *vcpu);
diff --git a/arch/x86/mm/pat/memtype.c b/arch/x86/mm/pat/memtype.c
index 0417368011c4..365af5a84fbf 100644
--- a/arch/x86/mm/pat/memtype.c
+++ b/arch/x86/mm/pat/memtype.c
@@ -247,12 +247,6 @@ void pat_cpu_init(void)
void __init pat_bp_init(void)
{
struct cpuinfo_x86 *c = &boot_cpu_data;
-#define PAT(p0, p1, p2, p3, p4, p5, p6, p7) \
- ((X86_MEMTYPE_ ## p0) | (X86_MEMTYPE_ ## p1 << 8) | \
- (X86_MEMTYPE_ ## p2 << 16) | (X86_MEMTYPE_ ## p3 << 24) | \
- (X86_MEMTYPE_ ## p4 << 32) | (X86_MEMTYPE_ ## p5 << 40) | \
- (X86_MEMTYPE_ ## p6 << 48) | (X86_MEMTYPE_ ## p7 << 56))
-
if (!IS_ENABLED(CONFIG_X86_PAT))
pr_info_once("x86/PAT: PAT support disabled because CONFIG_X86_PAT is disabled in the kernel.\n");
@@ -283,7 +277,7 @@ void __init pat_bp_init(void)
* NOTE: When WC or WP is used, it is redirected to UC- per
* the default setup in __cachemode2pte_tbl[].
*/
- pat_msr_val = PAT(WB, WT, UC_MINUS, UC, WB, WT, UC_MINUS, UC);
+ pat_msr_val = PAT_VALUE(WB, WT, UC_MINUS, UC, WB, WT, UC_MINUS, UC);
}
/*
@@ -318,7 +312,7 @@ void __init pat_bp_init(void)
* NOTE: When WT or WP is used, it is redirected to UC- per
* the default setup in __cachemode2pte_tbl[].
*/
- pat_msr_val = PAT(WB, WC, UC_MINUS, UC, WB, WC, UC_MINUS, UC);
+ pat_msr_val = PAT_VALUE(WB, WC, UC_MINUS, UC, WB, WC, UC_MINUS, UC);
} else {
/*
* Full PAT support. We put WT in slot 7 to improve
@@ -346,13 +340,12 @@ void __init pat_bp_init(void)
* The reserved slots are unused, but mapped to their
* corresponding types in the presence of PAT errata.
*/
- pat_msr_val = PAT(WB, WC, UC_MINUS, UC, WB, WP, UC_MINUS, WT);
+ pat_msr_val = PAT_VALUE(WB, WC, UC_MINUS, UC, WB, WP, UC_MINUS, WT);
}
memory_caching_control |= CACHE_PAT;
init_cache_modes(pat_msr_val);
-#undef PAT
}
static DEFINE_SPINLOCK(memtype_lock); /* protects memtype accesses */
--
2.45.0.215.g3402c0e53f-goog
Move the stuffing of the vCPU's PAT to the architectural "default" value
from kvm_arch_vcpu_create() to kvm_vcpu_reset(), guarded by !init_event,
to better capture that the default value is the value "Following Power-up
or Reset". E.g. setting PAT only during creation would break if KVM were
to expose a RESET ioctl() to userspace (which is unlikely, but that's not
a good reason to have unintuitive code).
No functional change.
Reviewed-by: Xiaoyao Li <[email protected]>
Reviewed-by: Kai Huang <[email protected]>
Signed-off-by: Sean Christopherson <[email protected]>
---
arch/x86/kvm/x86.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index d750546ec934..32fcf2a81f39 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -12211,8 +12211,6 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
vcpu->arch.maxphyaddr = cpuid_query_maxphyaddr(vcpu);
vcpu->arch.reserved_gpa_bits = kvm_vcpu_reserved_gpa_bits_raw(vcpu);
- vcpu->arch.pat = MSR_IA32_CR_PAT_DEFAULT;
-
kvm_async_pf_hash_reset(vcpu);
vcpu->arch.perf_capabilities = kvm_caps.supported_perf_cap;
@@ -12379,6 +12377,8 @@ void kvm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
if (!init_event) {
vcpu->arch.smbase = 0x30000;
+ vcpu->arch.pat = MSR_IA32_CR_PAT_DEFAULT;
+
vcpu->arch.msr_misc_features_enables = 0;
vcpu->arch.ia32_misc_enable_msr = MSR_IA32_MISC_ENABLE_PEBS_UNAVAIL |
MSR_IA32_MISC_ENABLE_BTS_UNAVAIL;
--
2.45.0.215.g3402c0e53f-goog
From: Xin Li <[email protected]>
Move the bit defines for MSR_IA32_VMX_BASIC from msr-index.h to vmx.h so
that they are colocated with other VMX MSR bit defines, and with the
helpers that extract specific information from an MSR_IA32_VMX_BASIC value.
Opportunistically use BIT_ULL() instead of open coding hex values.
Opportunistically rename VMX_BASIC_64 to VMX_BASIC_32BIT_PHYS_ADDR_ONLY,
as "VMX_BASIC_64" is widly misleading. The flag enumerates that addresses
are limited to 32 bits, not that 64-bit addresses are allowed.
Cc: Shan Kang <[email protected]>
Cc: Kai Huang <[email protected]>
Signed-off-by: Xin Li <[email protected]>
[sean: split to separate patch, write changelog]
Reviewed-by: Zhao Liu <[email protected]>
Reviewed-by: Kai Huang <[email protected]>
Signed-off-by: Sean Christopherson <[email protected]>
---
arch/x86/include/asm/msr-index.h | 8 --------
arch/x86/include/asm/vmx.h | 7 +++++++
2 files changed, 7 insertions(+), 8 deletions(-)
diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index b14434af00df..7e7cad59e552 100644
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -1168,14 +1168,6 @@
#define MSR_IA32_VMX_VMFUNC 0x00000491
#define MSR_IA32_VMX_PROCBASED_CTLS3 0x00000492
-/* VMX_BASIC bits and bitmasks */
-#define VMX_BASIC_VMCS_SIZE_SHIFT 32
-#define VMX_BASIC_TRUE_CTLS (1ULL << 55)
-#define VMX_BASIC_64 0x0001000000000000LLU
-#define VMX_BASIC_MEM_TYPE_SHIFT 50
-#define VMX_BASIC_MEM_TYPE_MASK 0x003c000000000000LLU
-#define VMX_BASIC_INOUT 0x0040000000000000LLU
-
/* Resctrl MSRs: */
/* - Intel: */
#define MSR_IA32_L3_QOS_CFG 0xc81
diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
index e531d8d80a11..81b986e501a9 100644
--- a/arch/x86/include/asm/vmx.h
+++ b/arch/x86/include/asm/vmx.h
@@ -135,6 +135,13 @@
#define VMX_VMFUNC_EPTP_SWITCHING VMFUNC_CONTROL_BIT(EPTP_SWITCHING)
#define VMFUNC_EPTP_ENTRIES 512
+#define VMX_BASIC_VMCS_SIZE_SHIFT 32
+#define VMX_BASIC_32BIT_PHYS_ADDR_ONLY BIT_ULL(48)
+#define VMX_BASIC_DUAL_MONITOR_TREATMENT BIT_ULL(49)
+#define VMX_BASIC_MEM_TYPE_SHIFT 50
+#define VMX_BASIC_INOUT BIT_ULL(54)
+#define VMX_BASIC_TRUE_CTLS BIT_ULL(55)
+
static inline u32 vmx_basic_vmcs_revision_id(u64 vmx_basic)
{
return vmx_basic & GENMASK_ULL(30, 0);
--
2.45.0.215.g3402c0e53f-goog
From: Xin Li <[email protected]>
Track the "basic" capabilities VMX MSR as a single u64 in vmcs_config
instead of splitting it across three fields, that obviously don't combine
into a single 64-bit value, so that KVM can use the macros that define MSR
bits using their absolute position. Replace all open coded shifts and
masks, many of which are relative to the "high" half, with the appropriate
macro.
Opportunistically use VMX_BASIC_32BIT_PHYS_ADDR_ONLY instead of an open
coded equivalent, and clean up the related comment to not reference a
specific SDM section (to the surprise of no one, the comment is stale).
No functional change intended (though obviously the code generation will
be quite different).
Cc: Shan Kang <[email protected]>
Cc: Kai Huang <[email protected]>
Signed-off-by: Xin Li <[email protected]>
[sean: split to separate patch, write changelog]
Reviewed-by: Xiaoyao Li <[email protected]>
Reviewed-by: Kai Huang <[email protected]>
Signed-off-by: Sean Christopherson <[email protected]>
---
arch/x86/include/asm/vmx.h | 5 +++++
arch/x86/kvm/vmx/capabilities.h | 6 ++----
arch/x86/kvm/vmx/vmx.c | 28 ++++++++++++++--------------
3 files changed, 21 insertions(+), 18 deletions(-)
diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
index 81b986e501a9..90963b14afaa 100644
--- a/arch/x86/include/asm/vmx.h
+++ b/arch/x86/include/asm/vmx.h
@@ -152,6 +152,11 @@ static inline u32 vmx_basic_vmcs_size(u64 vmx_basic)
return (vmx_basic & GENMASK_ULL(44, 32)) >> 32;
}
+static inline u32 vmx_basic_vmcs_mem_type(u64 vmx_basic)
+{
+ return (vmx_basic & GENMASK_ULL(53, 50)) >> 50;
+}
+
static inline int vmx_misc_preemption_timer_rate(u64 vmx_misc)
{
return vmx_misc & VMX_MISC_PREEMPTION_TIMER_RATE_MASK;
diff --git a/arch/x86/kvm/vmx/capabilities.h b/arch/x86/kvm/vmx/capabilities.h
index 41a4533f9989..86ce8bb96bed 100644
--- a/arch/x86/kvm/vmx/capabilities.h
+++ b/arch/x86/kvm/vmx/capabilities.h
@@ -54,9 +54,7 @@ struct nested_vmx_msrs {
};
struct vmcs_config {
- int size;
- u32 basic_cap;
- u32 revision_id;
+ u64 basic;
u32 pin_based_exec_ctrl;
u32 cpu_based_exec_ctrl;
u32 cpu_based_2nd_exec_ctrl;
@@ -76,7 +74,7 @@ extern struct vmx_capability vmx_capability __ro_after_init;
static inline bool cpu_has_vmx_basic_inout(void)
{
- return (((u64)vmcs_config.basic_cap << 32) & VMX_BASIC_INOUT);
+ return vmcs_config.basic & VMX_BASIC_INOUT;
}
static inline bool cpu_has_virtual_nmis(void)
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 7dd76d04b4b0..695fd7683ba7 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -2570,13 +2570,13 @@ static u64 adjust_vmx_controls64(u64 ctl_opt, u32 msr)
static int setup_vmcs_config(struct vmcs_config *vmcs_conf,
struct vmx_capability *vmx_cap)
{
- u32 vmx_msr_low, vmx_msr_high;
u32 _pin_based_exec_control = 0;
u32 _cpu_based_exec_control = 0;
u32 _cpu_based_2nd_exec_control = 0;
u64 _cpu_based_3rd_exec_control = 0;
u32 _vmexit_control = 0;
u32 _vmentry_control = 0;
+ u64 basic_msr;
u64 misc_msr;
int i;
@@ -2699,29 +2699,29 @@ static int setup_vmcs_config(struct vmcs_config *vmcs_conf,
_vmexit_control &= ~x_ctrl;
}
- rdmsr(MSR_IA32_VMX_BASIC, vmx_msr_low, vmx_msr_high);
+ rdmsrl(MSR_IA32_VMX_BASIC, basic_msr);
/* IA-32 SDM Vol 3B: VMCS size is never greater than 4kB. */
- if ((vmx_msr_high & 0x1fff) > PAGE_SIZE)
+ if (vmx_basic_vmcs_size(basic_msr) > PAGE_SIZE)
return -EIO;
#ifdef CONFIG_X86_64
- /* IA-32 SDM Vol 3B: 64-bit CPUs always have VMX_BASIC_MSR[48]==0. */
- if (vmx_msr_high & (1u<<16))
+ /*
+ * KVM expects to be able to shove all legal physical addresses into
+ * VMCS fields for 64-bit kernels, and per the SDM, "This bit is always
+ * 0 for processors that support Intel 64 architecture".
+ */
+ if (basic_msr & VMX_BASIC_32BIT_PHYS_ADDR_ONLY)
return -EIO;
#endif
/* Require Write-Back (WB) memory type for VMCS accesses. */
- if (((vmx_msr_high >> 18) & 15) != X86_MEMTYPE_WB)
+ if (vmx_basic_vmcs_mem_type(basic_msr) != X86_MEMTYPE_WB)
return -EIO;
rdmsrl(MSR_IA32_VMX_MISC, misc_msr);
- vmcs_conf->size = vmx_msr_high & 0x1fff;
- vmcs_conf->basic_cap = vmx_msr_high & ~0x1fff;
-
- vmcs_conf->revision_id = vmx_msr_low;
-
+ vmcs_conf->basic = basic_msr;
vmcs_conf->pin_based_exec_ctrl = _pin_based_exec_control;
vmcs_conf->cpu_based_exec_ctrl = _cpu_based_exec_control;
vmcs_conf->cpu_based_2nd_exec_ctrl = _cpu_based_2nd_exec_control;
@@ -2871,13 +2871,13 @@ struct vmcs *alloc_vmcs_cpu(bool shadow, int cpu, gfp_t flags)
if (!pages)
return NULL;
vmcs = page_address(pages);
- memset(vmcs, 0, vmcs_config.size);
+ memset(vmcs, 0, vmx_basic_vmcs_size(vmcs_config.basic));
/* KVM supports Enlightened VMCS v1 only */
if (kvm_is_using_evmcs())
vmcs->hdr.revision_id = KVM_EVMCS_VERSION;
else
- vmcs->hdr.revision_id = vmcs_config.revision_id;
+ vmcs->hdr.revision_id = vmx_basic_vmcs_revision_id(vmcs_config.basic);
if (shadow)
vmcs->hdr.shadow_vmcs = 1;
@@ -2970,7 +2970,7 @@ static __init int alloc_kvm_area(void)
* physical CPU.
*/
if (kvm_is_using_evmcs())
- vmcs->hdr.revision_id = vmcs_config.revision_id;
+ vmcs->hdr.revision_id = vmx_basic_vmcs_revision_id(vmcs_config.basic);
per_cpu(vmxarea, cpu) = vmcs;
}
--
2.45.0.215.g3402c0e53f-goog
From: Xin Li <[email protected]>
Use macros in vmx_restore_vmx_basic() instead of open coding everything
using BIT_ULL() and GENMASK_ULL(). Opportunistically split feature bits
and reserved bits into separate variables, and add a comment explaining
the subset logic (it's not immediately obvious that the set of feature
bits is NOT the set of _supported_ feature bits).
Cc: Shan Kang <[email protected]>
Cc: Kai Huang <[email protected]>
Signed-off-by: Xin Li <[email protected]>
[sean: split to separate patch, write changelog, drop #defines]
Reviewed-by: Zhao Liu <[email protected]>
Reviewed-by: Xiaoyao Li <[email protected]>
Reviewed-by: Kai Huang <[email protected]>
Signed-off-by: Sean Christopherson <[email protected]>
---
arch/x86/kvm/vmx/nested.c | 25 ++++++++++++++++++-------
1 file changed, 18 insertions(+), 7 deletions(-)
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 804e9240889a..fbfd3c5cb541 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -1250,21 +1250,32 @@ static bool is_bitwise_subset(u64 superset, u64 subset, u64 mask)
static int vmx_restore_vmx_basic(struct vcpu_vmx *vmx, u64 data)
{
- const u64 feature_and_reserved =
- /* feature (except bit 48; see below) */
- BIT_ULL(49) | BIT_ULL(54) | BIT_ULL(55) |
- /* reserved */
- BIT_ULL(31) | GENMASK_ULL(47, 45) | GENMASK_ULL(63, 56);
+ const u64 feature_bits = VMX_BASIC_DUAL_MONITOR_TREATMENT |
+ VMX_BASIC_INOUT |
+ VMX_BASIC_TRUE_CTLS;
+
+ const u64 reserved_bits = GENMASK_ULL(63, 56) |
+ GENMASK_ULL(47, 45) |
+ BIT_ULL(31);
+
u64 vmx_basic = vmcs_config.nested.basic;
- if (!is_bitwise_subset(vmx_basic, data, feature_and_reserved))
+ BUILD_BUG_ON(feature_bits & reserved_bits);
+
+ /*
+ * Except for 32BIT_PHYS_ADDR_ONLY, which is an anti-feature bit (has
+ * inverted polarity), the incoming value must not set feature bits or
+ * reserved bits that aren't allowed/supported by KVM. Fields, i.e.
+ * multi-bit values, are explicitly checked below.
+ */
+ if (!is_bitwise_subset(vmx_basic, data, feature_bits | reserved_bits))
return -EINVAL;
/*
* KVM does not emulate a version of VMX that constrains physical
* addresses of VMX structures (e.g. VMCS) to 32-bits.
*/
- if (data & BIT_ULL(48))
+ if (data & VMX_BASIC_32BIT_PHYS_ADDR_ONLY)
return -EINVAL;
if (vmx_basic_vmcs_revision_id(vmx_basic) !=
--
2.45.0.215.g3402c0e53f-goog
Add a helper to encode the VMCS revision, size, and supported memory types
in MSR_IA32_VMX_BASIC, i.e. when synthesizing KVM's supported BASIC MSR
value, and delete the now unused VMCS size and memtype shift macros.
For a variety of reasons, KVM has shifted (pun intended) to using helpers
to *get* information from the VMX MSRs, as opposed to defined MASK and
SHIFT macros for direct use. Provide a similar helper for the nested VMX
code, which needs to *set* information, so that KVM isn't left with a mix
of SHIFT macros and dedicated helpers.
Reported-by: Xiaoyao Li <[email protected]>
Signed-off-by: Sean Christopherson <[email protected]>
---
arch/x86/include/asm/vmx.h | 7 +++++--
arch/x86/kvm/vmx/nested.c | 8 +++-----
2 files changed, 8 insertions(+), 7 deletions(-)
diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
index 90963b14afaa..65aaf0577265 100644
--- a/arch/x86/include/asm/vmx.h
+++ b/arch/x86/include/asm/vmx.h
@@ -135,10 +135,8 @@
#define VMX_VMFUNC_EPTP_SWITCHING VMFUNC_CONTROL_BIT(EPTP_SWITCHING)
#define VMFUNC_EPTP_ENTRIES 512
-#define VMX_BASIC_VMCS_SIZE_SHIFT 32
#define VMX_BASIC_32BIT_PHYS_ADDR_ONLY BIT_ULL(48)
#define VMX_BASIC_DUAL_MONITOR_TREATMENT BIT_ULL(49)
-#define VMX_BASIC_MEM_TYPE_SHIFT 50
#define VMX_BASIC_INOUT BIT_ULL(54)
#define VMX_BASIC_TRUE_CTLS BIT_ULL(55)
@@ -157,6 +155,11 @@ static inline u32 vmx_basic_vmcs_mem_type(u64 vmx_basic)
return (vmx_basic & GENMASK_ULL(53, 50)) >> 50;
}
+static inline u64 vmx_basic_encode_vmcs_info(u32 revision, u16 size, u8 memtype)
+{
+ return revision | ((u64)size << 32) | ((u64)memtype << 50);
+}
+
static inline int vmx_misc_preemption_timer_rate(u64 vmx_misc)
{
return vmx_misc & VMX_MISC_PREEMPTION_TIMER_RATE_MASK;
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index fbfd3c5cb541..d690fa720dcf 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -7035,12 +7035,10 @@ static void nested_vmx_setup_basic(struct nested_vmx_msrs *msrs)
* guest, and the VMCS structure we give it - not about the
* VMX support of the underlying hardware.
*/
- msrs->basic =
- VMCS12_REVISION |
- VMX_BASIC_TRUE_CTLS |
- ((u64)VMCS12_SIZE << VMX_BASIC_VMCS_SIZE_SHIFT) |
- (X86_MEMTYPE_WB << VMX_BASIC_MEM_TYPE_SHIFT);
+ msrs->basic = vmx_basic_encode_vmcs_info(VMCS12_REVISION, VMCS12_SIZE,
+ X86_MEMTYPE_WB);
+ msrs->basic |= VMX_BASIC_TRUE_CTLS;
if (cpu_has_vmx_basic_inout())
msrs->basic |= VMX_BASIC_INOUT;
}
--
2.45.0.215.g3402c0e53f-goog
Move the handful of MSR_IA32_VMX_MISC bit defines that are currently in
msr-indx.h to vmx.h so that all of the VMX_MISC defines and wrappers can
be found in a single location.
Opportunistically use BIT_ULL() instead of open coding hex values, add
defines for feature bits that are architectural defined, and move the
defines down in the file so that they are colocated with the helpers for
getting fields from VMX_MISC.
No functional change intended.
Cc: Shan Kang <[email protected]>
Cc: Kai Huang <[email protected]>
Signed-off-by: Xin Li <[email protected]>
[sean: split to separate patch, write changelog]
Reviewed-by: Zhao Liu <[email protected]>
Reviewed-by: Kai Huang <[email protected]>
Signed-off-by: Sean Christopherson <[email protected]>
---
arch/x86/include/asm/msr-index.h | 5 -----
arch/x86/include/asm/vmx.h | 19 ++++++++++++-------
arch/x86/kvm/vmx/capabilities.h | 4 ++--
arch/x86/kvm/vmx/nested.c | 2 +-
arch/x86/kvm/vmx/nested.h | 2 +-
5 files changed, 16 insertions(+), 16 deletions(-)
diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index 7e7cad59e552..fdfeef40514a 100644
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -1184,11 +1184,6 @@
#define MSR_IA32_SMBA_BW_BASE 0xc0000280
#define MSR_IA32_EVT_CFG_BASE 0xc0000400
-/* MSR_IA32_VMX_MISC bits */
-#define MSR_IA32_VMX_MISC_INTEL_PT (1ULL << 14)
-#define MSR_IA32_VMX_MISC_VMWRITE_SHADOW_RO_FIELDS (1ULL << 29)
-#define MSR_IA32_VMX_MISC_PREEMPTION_TIMER_SCALE 0x1F
-
/* AMD-V MSRs */
#define MSR_VM_CR 0xc0010114
#define MSR_VM_IGNNE 0xc0010115
diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
index 65aaf0577265..400819ccb42c 100644
--- a/arch/x86/include/asm/vmx.h
+++ b/arch/x86/include/asm/vmx.h
@@ -122,13 +122,6 @@
#define VM_ENTRY_ALWAYSON_WITHOUT_TRUE_MSR 0x000011ff
-#define VMX_MISC_PREEMPTION_TIMER_RATE_MASK 0x0000001f
-#define VMX_MISC_SAVE_EFER_LMA 0x00000020
-#define VMX_MISC_ACTIVITY_HLT 0x00000040
-#define VMX_MISC_ACTIVITY_WAIT_SIPI 0x00000100
-#define VMX_MISC_ZERO_LEN_INS 0x40000000
-#define VMX_MISC_MSR_LIST_MULTIPLIER 512
-
/* VMFUNC functions */
#define VMFUNC_CONTROL_BIT(x) BIT((VMX_FEATURE_##x & 0x1f) - 28)
@@ -160,6 +153,18 @@ static inline u64 vmx_basic_encode_vmcs_info(u32 revision, u16 size, u8 memtype)
return revision | ((u64)size << 32) | ((u64)memtype << 50);
}
+#define VMX_MISC_PREEMPTION_TIMER_RATE_MASK GENMASK_ULL(4, 0)
+#define VMX_MISC_SAVE_EFER_LMA BIT_ULL(5)
+#define VMX_MISC_ACTIVITY_HLT BIT_ULL(6)
+#define VMX_MISC_ACTIVITY_SHUTDOWN BIT_ULL(7)
+#define VMX_MISC_ACTIVITY_WAIT_SIPI BIT_ULL(8)
+#define VMX_MISC_INTEL_PT BIT_ULL(14)
+#define VMX_MISC_RDMSR_IN_SMM BIT_ULL(15)
+#define VMX_MISC_VMXOFF_BLOCK_SMI BIT_ULL(28)
+#define VMX_MISC_VMWRITE_SHADOW_RO_FIELDS BIT_ULL(29)
+#define VMX_MISC_ZERO_LEN_INS BIT_ULL(30)
+#define VMX_MISC_MSR_LIST_MULTIPLIER 512
+
static inline int vmx_misc_preemption_timer_rate(u64 vmx_misc)
{
return vmx_misc & VMX_MISC_PREEMPTION_TIMER_RATE_MASK;
diff --git a/arch/x86/kvm/vmx/capabilities.h b/arch/x86/kvm/vmx/capabilities.h
index 86ce8bb96bed..cb6588238f46 100644
--- a/arch/x86/kvm/vmx/capabilities.h
+++ b/arch/x86/kvm/vmx/capabilities.h
@@ -223,7 +223,7 @@ static inline bool cpu_has_vmx_vmfunc(void)
static inline bool cpu_has_vmx_shadow_vmcs(void)
{
/* check if the cpu supports writing r/o exit information fields */
- if (!(vmcs_config.misc & MSR_IA32_VMX_MISC_VMWRITE_SHADOW_RO_FIELDS))
+ if (!(vmcs_config.misc & VMX_MISC_VMWRITE_SHADOW_RO_FIELDS))
return false;
return vmcs_config.cpu_based_2nd_exec_ctrl &
@@ -365,7 +365,7 @@ static inline bool cpu_has_vmx_invvpid_global(void)
static inline bool cpu_has_vmx_intel_pt(void)
{
- return (vmcs_config.misc & MSR_IA32_VMX_MISC_INTEL_PT) &&
+ return (vmcs_config.misc & VMX_MISC_INTEL_PT) &&
(vmcs_config.cpu_based_2nd_exec_ctrl & SECONDARY_EXEC_PT_USE_GPA) &&
(vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_RTIT_CTL);
}
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index d690fa720dcf..3fdb4a1c7e43 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -7020,7 +7020,7 @@ static void nested_vmx_setup_misc_data(struct vmcs_config *vmcs_conf,
{
msrs->misc_low = (u32)vmcs_conf->misc & VMX_MISC_SAVE_EFER_LMA;
msrs->misc_low |=
- MSR_IA32_VMX_MISC_VMWRITE_SHADOW_RO_FIELDS |
+ VMX_MISC_VMWRITE_SHADOW_RO_FIELDS |
VMX_MISC_EMULATED_PREEMPTION_TIMER_RATE |
VMX_MISC_ACTIVITY_HLT |
VMX_MISC_ACTIVITY_WAIT_SIPI;
diff --git a/arch/x86/kvm/vmx/nested.h b/arch/x86/kvm/vmx/nested.h
index cce4e2aa30fb..0782fe599757 100644
--- a/arch/x86/kvm/vmx/nested.h
+++ b/arch/x86/kvm/vmx/nested.h
@@ -109,7 +109,7 @@ static inline unsigned nested_cpu_vmx_misc_cr3_count(struct kvm_vcpu *vcpu)
static inline bool nested_cpu_has_vmwrite_any_field(struct kvm_vcpu *vcpu)
{
return to_vmx(vcpu)->nested.msrs.misc_low &
- MSR_IA32_VMX_MISC_VMWRITE_SHADOW_RO_FIELDS;
+ VMX_MISC_VMWRITE_SHADOW_RO_FIELDS;
}
static inline bool nested_cpu_has_zero_length_injection(struct kvm_vcpu *vcpu)
--
2.45.0.215.g3402c0e53f-goog
From: Xin Li <[email protected]>
Use vmx_misc_preemption_timer_rate() to get the rate in hardware_setup(),
and open code the rate's bitmask in vmx_misc_preemption_timer_rate() so
that the function looks like all the helpers that grab values from
VMX_BASIC and VMX_MISC MSR values.
No functional change intended.
Cc: Shan Kang <[email protected]>
Cc: Kai Huang <[email protected]>
Signed-off-by: Xin Li <[email protected]>
[sean: split to separate patch, write changelog]
Reviewed-by: Kai Huang <[email protected]>
Signed-off-by: Sean Christopherson <[email protected]>
---
arch/x86/include/asm/vmx.h | 3 +--
arch/x86/kvm/vmx/vmx.c | 2 +-
2 files changed, 2 insertions(+), 3 deletions(-)
diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
index 400819ccb42c..f7fd4369b821 100644
--- a/arch/x86/include/asm/vmx.h
+++ b/arch/x86/include/asm/vmx.h
@@ -153,7 +153,6 @@ static inline u64 vmx_basic_encode_vmcs_info(u32 revision, u16 size, u8 memtype)
return revision | ((u64)size << 32) | ((u64)memtype << 50);
}
-#define VMX_MISC_PREEMPTION_TIMER_RATE_MASK GENMASK_ULL(4, 0)
#define VMX_MISC_SAVE_EFER_LMA BIT_ULL(5)
#define VMX_MISC_ACTIVITY_HLT BIT_ULL(6)
#define VMX_MISC_ACTIVITY_SHUTDOWN BIT_ULL(7)
@@ -167,7 +166,7 @@ static inline u64 vmx_basic_encode_vmcs_info(u32 revision, u16 size, u8 memtype)
static inline int vmx_misc_preemption_timer_rate(u64 vmx_misc)
{
- return vmx_misc & VMX_MISC_PREEMPTION_TIMER_RATE_MASK;
+ return vmx_misc & GENMASK_ULL(4, 0);
}
static inline int vmx_misc_cr3_count(u64 vmx_misc)
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 695fd7683ba7..fa1a7f775135 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -8546,7 +8546,7 @@ __init int vmx_hardware_setup(void)
u64 use_timer_freq = 5000ULL * 1000 * 1000;
cpu_preemption_timer_multi =
- vmcs_config.misc & VMX_MISC_PREEMPTION_TIMER_RATE_MASK;
+ vmx_misc_preemption_timer_rate(vmcs_config.misc);
if (tsc_khz)
use_timer_freq = (u64)tsc_khz * 1000;
--
2.45.0.215.g3402c0e53f-goog
From: Xin Li <[email protected]>
Use macros in vmx_restore_vmx_misc() instead of open coding everything
using BIT_ULL() and GENMASK_ULL(). Opportunistically split feature bits
and reserved bits into separate variables, and add a comment explaining
the subset logic (it's not immediately obvious that the set of feature
bits is NOT the set of _supported_ feature bits).
Cc: Shan Kang <[email protected]>
Cc: Kai Huang <[email protected]>
Signed-off-by: Xin Li <[email protected]>
[sean: split to separate patch, write changelog, drop #defines]
Reviewed-by: Xiaoyao Li <[email protected]>
Reviewed-by: Kai Huang <[email protected]>
Reviewed-by: Zhao Liu <[email protected]>
Signed-off-by: Sean Christopherson <[email protected]>
---
arch/x86/kvm/vmx/nested.c | 27 ++++++++++++++++++++-------
1 file changed, 20 insertions(+), 7 deletions(-)
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 3fdb4a1c7e43..bd7266a368a0 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -1344,16 +1344,29 @@ vmx_restore_control_msr(struct vcpu_vmx *vmx, u32 msr_index, u64 data)
static int vmx_restore_vmx_misc(struct vcpu_vmx *vmx, u64 data)
{
- const u64 feature_and_reserved_bits =
- /* feature */
- BIT_ULL(5) | GENMASK_ULL(8, 6) | BIT_ULL(14) | BIT_ULL(15) |
- BIT_ULL(28) | BIT_ULL(29) | BIT_ULL(30) |
- /* reserved */
- GENMASK_ULL(13, 9) | BIT_ULL(31);
+ const u64 feature_bits = VMX_MISC_SAVE_EFER_LMA |
+ VMX_MISC_ACTIVITY_HLT |
+ VMX_MISC_ACTIVITY_SHUTDOWN |
+ VMX_MISC_ACTIVITY_WAIT_SIPI |
+ VMX_MISC_INTEL_PT |
+ VMX_MISC_RDMSR_IN_SMM |
+ VMX_MISC_VMWRITE_SHADOW_RO_FIELDS |
+ VMX_MISC_VMXOFF_BLOCK_SMI |
+ VMX_MISC_ZERO_LEN_INS;
+
+ const u64 reserved_bits = BIT_ULL(31) | GENMASK_ULL(13, 9);
+
u64 vmx_misc = vmx_control_msr(vmcs_config.nested.misc_low,
vmcs_config.nested.misc_high);
- if (!is_bitwise_subset(vmx_misc, data, feature_and_reserved_bits))
+ BUILD_BUG_ON(feature_bits & reserved_bits);
+
+ /*
+ * The incoming value must not set feature bits or reserved bits that
+ * aren't allowed/supported by KVM. Fields, i.e. multi-bit values, are
+ * explicitly checked below.
+ */
+ if (!is_bitwise_subset(vmx_misc, data, feature_bits | reserved_bits))
return -EINVAL;
if ((vmx->nested.msrs.pinbased_ctls_high &
--
2.45.0.215.g3402c0e53f-goog
On 21/05/2024 5:59 am, Sean Christopherson wrote:
> Add a helper to encode the VMCS revision, size, and supported memory types
> in MSR_IA32_VMX_BASIC, i.e. when synthesizing KVM's supported BASIC MSR
> value, and delete the now unused VMCS size and memtype shift macros.
>
> For a variety of reasons, KVM has shifted (pun intended) to using helpers
> to *get* information from the VMX MSRs, as opposed to defined MASK and
> SHIFT macros for direct use. Provide a similar helper for the nested VMX
> code, which needs to *set* information, so that KVM isn't left with a mix
> of SHIFT macros and dedicated helpers.
>
> Reported-by: Xiaoyao Li <[email protected]>
> Signed-off-by: Sean Christopherson <[email protected]>
> ---
Reviewed-by: Kai Huang <[email protected]>
On 5/21/2024 1:59 AM, Sean Christopherson wrote:
> From: Xin Li <[email protected]>
>
> Move the bit defines for MSR_IA32_VMX_BASIC from msr-index.h to vmx.h so
> that they are colocated with other VMX MSR bit defines, and with the
> helpers that extract specific information from an MSR_IA32_VMX_BASIC value.
>
> Opportunistically use BIT_ULL() instead of open coding hex values.
>
> Opportunistically rename VMX_BASIC_64 to VMX_BASIC_32BIT_PHYS_ADDR_ONLY,
> as "VMX_BASIC_64" is widly misleading. The flag enumerates that addresses
> are limited to 32 bits, not that 64-bit addresses are allowed.
>
> Cc: Shan Kang <[email protected]>
> Cc: Kai Huang <[email protected]>
> Signed-off-by: Xin Li <[email protected]>
> [sean: split to separate patch, write changelog]
> Reviewed-by: Zhao Liu <[email protected]>
> Reviewed-by: Kai Huang <[email protected]>
> Signed-off-by: Sean Christopherson <[email protected]>
> ---
> arch/x86/include/asm/msr-index.h | 8 --------
> arch/x86/include/asm/vmx.h | 7 +++++++
> 2 files changed, 7 insertions(+), 8 deletions(-)
>
> diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
> index b14434af00df..7e7cad59e552 100644
> --- a/arch/x86/include/asm/msr-index.h
> +++ b/arch/x86/include/asm/msr-index.h
> @@ -1168,14 +1168,6 @@
> #define MSR_IA32_VMX_VMFUNC 0x00000491
> #define MSR_IA32_VMX_PROCBASED_CTLS3 0x00000492
>
> -/* VMX_BASIC bits and bitmasks */
> -#define VMX_BASIC_VMCS_SIZE_SHIFT 32
> -#define VMX_BASIC_TRUE_CTLS (1ULL << 55)
> -#define VMX_BASIC_64 0x0001000000000000LLU
> -#define VMX_BASIC_MEM_TYPE_SHIFT 50
> -#define VMX_BASIC_MEM_TYPE_MASK 0x003c000000000000LLU
VMX_BASIC_MEM_TYPE_MASK gets deleted. It deserves to be mentioned?
> -#define VMX_BASIC_INOUT 0x0040000000000000LLU
> -
> /* Resctrl MSRs: */
> /* - Intel: */
> #define MSR_IA32_L3_QOS_CFG 0xc81
> diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
> index e531d8d80a11..81b986e501a9 100644
> --- a/arch/x86/include/asm/vmx.h
> +++ b/arch/x86/include/asm/vmx.h
> @@ -135,6 +135,13 @@
> #define VMX_VMFUNC_EPTP_SWITCHING VMFUNC_CONTROL_BIT(EPTP_SWITCHING)
> #define VMFUNC_EPTP_ENTRIES 512
>
> +#define VMX_BASIC_VMCS_SIZE_SHIFT 32
> +#define VMX_BASIC_32BIT_PHYS_ADDR_ONLY BIT_ULL(48)
> +#define VMX_BASIC_DUAL_MONITOR_TREATMENT BIT_ULL(49)
why add it?
> +#define VMX_BASIC_MEM_TYPE_SHIFT 50
> +#define VMX_BASIC_INOUT BIT_ULL(54)
> +#define VMX_BASIC_TRUE_CTLS BIT_ULL(55)
> +
> static inline u32 vmx_basic_vmcs_revision_id(u64 vmx_basic)
> {
> return vmx_basic & GENMASK_ULL(30, 0);
On 5/21/2024 1:59 AM, Sean Christopherson wrote:
> Add a helper to encode the VMCS revision, size, and supported memory types
> in MSR_IA32_VMX_BASIC, i.e. when synthesizing KVM's supported BASIC MSR
> value, and delete the now unused VMCS size and memtype shift macros.
>
> For a variety of reasons, KVM has shifted (pun intended) to using helpers
> to *get* information from the VMX MSRs, as opposed to defined MASK and
> SHIFT macros for direct use. Provide a similar helper for the nested VMX
> code, which needs to *set* information, so that KVM isn't left with a mix
> of SHIFT macros and dedicated helpers.
>
> Reported-by: Xiaoyao Li <[email protected]>
> Signed-off-by: Sean Christopherson <[email protected]>
Reviewed-by: Xiaoyao Li <[email protected]>
> ---
> arch/x86/include/asm/vmx.h | 7 +++++--
> arch/x86/kvm/vmx/nested.c | 8 +++-----
> 2 files changed, 8 insertions(+), 7 deletions(-)
>
> diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
> index 90963b14afaa..65aaf0577265 100644
> --- a/arch/x86/include/asm/vmx.h
> +++ b/arch/x86/include/asm/vmx.h
> @@ -135,10 +135,8 @@
> #define VMX_VMFUNC_EPTP_SWITCHING VMFUNC_CONTROL_BIT(EPTP_SWITCHING)
> #define VMFUNC_EPTP_ENTRIES 512
>
> -#define VMX_BASIC_VMCS_SIZE_SHIFT 32
> #define VMX_BASIC_32BIT_PHYS_ADDR_ONLY BIT_ULL(48)
> #define VMX_BASIC_DUAL_MONITOR_TREATMENT BIT_ULL(49)
> -#define VMX_BASIC_MEM_TYPE_SHIFT 50
> #define VMX_BASIC_INOUT BIT_ULL(54)
> #define VMX_BASIC_TRUE_CTLS BIT_ULL(55)
>
> @@ -157,6 +155,11 @@ static inline u32 vmx_basic_vmcs_mem_type(u64 vmx_basic)
> return (vmx_basic & GENMASK_ULL(53, 50)) >> 50;
> }
>
> +static inline u64 vmx_basic_encode_vmcs_info(u32 revision, u16 size, u8 memtype)
> +{
> + return revision | ((u64)size << 32) | ((u64)memtype << 50);
> +}
> +
> static inline int vmx_misc_preemption_timer_rate(u64 vmx_misc)
> {
> return vmx_misc & VMX_MISC_PREEMPTION_TIMER_RATE_MASK;
> diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
> index fbfd3c5cb541..d690fa720dcf 100644
> --- a/arch/x86/kvm/vmx/nested.c
> +++ b/arch/x86/kvm/vmx/nested.c
> @@ -7035,12 +7035,10 @@ static void nested_vmx_setup_basic(struct nested_vmx_msrs *msrs)
> * guest, and the VMCS structure we give it - not about the
> * VMX support of the underlying hardware.
> */
> - msrs->basic =
> - VMCS12_REVISION |
> - VMX_BASIC_TRUE_CTLS |
> - ((u64)VMCS12_SIZE << VMX_BASIC_VMCS_SIZE_SHIFT) |
> - (X86_MEMTYPE_WB << VMX_BASIC_MEM_TYPE_SHIFT);
> + msrs->basic = vmx_basic_encode_vmcs_info(VMCS12_REVISION, VMCS12_SIZE,
> + X86_MEMTYPE_WB);
>
> + msrs->basic |= VMX_BASIC_TRUE_CTLS;
> if (cpu_has_vmx_basic_inout())
> msrs->basic |= VMX_BASIC_INOUT;
> }
On 5/22/2024 2:48 PM, Xiaoyao Li wrote:
>> +#define VMX_BASIC_DUAL_MONITOR_TREATMENT BIT_ULL(49)
>
> why add it?
It gets used in Patch 6.
So either mention it in change log, or move it to patch 6.
On 5/21/2024 1:59 AM, Sean Christopherson wrote:
> +#define VMX_MISC_ACTIVITY_SHUTDOWN BIT_ULL(7)
Same as Patch 4. It is newly added but will be used by following patch 10.
Call out it in change log or move it to patch 10.
On Wed, May 22, 2024, Xiaoyao Li wrote:
> On 5/21/2024 1:59 AM, Sean Christopherson wrote:
> > +#define VMX_MISC_ACTIVITY_SHUTDOWN BIT_ULL(7)
>
> Same as Patch 4. It is newly added but will be used by following patch 10.
>
> Call out it in change log or move it to patch 10.
This one actually is mentioned, though it's not super obvious.
Opportunistically use BIT_ULL() instead of open coding hex values, add
defines for feature bits that are architecturally defined, and move the
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
defines down in the file so that they are colocated with the helpers for
getting fields from VMX_MISC.