[PATCH v5] KVM: x86: Implement PCID/INVPCID for guests with EPT

[PATCH v5] KVM: x86: Implement PCID/INVPCID for guests with EPT

[Mao, Junjie]

This patch handles PCID/INVPCID for guests.

Process-context identifiers (PCIDs) are a facility by which a logical processor
may cache information for multiple linear-address spaces so that the processor
may retain cached information when software switches to a different linear
address space. Refer to section 4.10.1 in IA32 Intel Software Developer's Manual
Volume 3A for details.

For guests with EPT, the PCID feature is enabled and INVPCID behaves as running
natively.
For guests without EPT, the PCID feature is disabled and INVPCID triggers #UD.

Changes from v4:
	Remove boot_cpu_has check for PCID in do_cpuid_ent
	Add check for EPT in vmx_invpcid_supported
	Hide INVPCID in vmx_cpuid_update also when vmx_invpcid_supported is false, which is needed on platforms with INVPCID support but EPT disabled
	Remove code added in prepare_vmcs02 as the bit has already been check by nested_vmx_entry_ctls_high in nested_vmx_run
	Remove check on old_cr0 in kvm_set_cr0

Changes from v3:
	Rebase to the latest tree
	Expose PCID to nested guests
	Remove the pcid_supported callback

Changes from v2:
	Seperate management of PCID and INVPCID
	Prevent PCID bit in CPUID from exposing on guest hypervisors
	Don't check the lower 12 bits when loading cr3 if cr4.PCIDE is set
	Explicitly disable INVPCID for L2 guests
	Support both enable and disable INVPCID in vmx_cpuid_update()

Changes from v1:
	Move cr0/cr4 writing checks to x86.c
	Update comments for the reason why PCID is disabled for non-EPT guests
	Do not support PCID/INVPCID for nested guests at present
	Clean up useless symbols

Signed-off-by: Junjie Mao <junjie.mao@intel.com>
---
 arch/x86/include/asm/kvm_host.h        |    4 ++-
 arch/x86/include/asm/processor-flags.h |    2 +
 arch/x86/include/asm/vmx.h             |    2 +
 arch/x86/kvm/cpuid.c                   |    5 ++-
 arch/x86/kvm/cpuid.h                   |    8 +++++++
 arch/x86/kvm/svm.c                     |    6 +++++
 arch/x86/kvm/vmx.c                     |   34 +++++++++++++++++++++++++++++++-
 arch/x86/kvm/x86.c                     |   23 ++++++++++++++++++--
 8 files changed, 77 insertions(+), 7 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index db7c1f2..95828a4 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -48,12 +48,13 @@
 
 #define CR3_PAE_RESERVED_BITS ((X86_CR3_PWT | X86_CR3_PCD) - 1)
 #define CR3_NONPAE_RESERVED_BITS ((PAGE_SIZE-1) & ~(X86_CR3_PWT | X86_CR3_PCD))
+#define CR3_PCID_ENABLED_RESERVED_BITS 0xFFFFFF0000000000ULL
 #define CR3_L_MODE_RESERVED_BITS (CR3_NONPAE_RESERVED_BITS |	\
 				  0xFFFFFF0000000000ULL)
 #define CR4_RESERVED_BITS                                               \
 	(~(unsigned long)(X86_CR4_VME | X86_CR4_PVI | X86_CR4_TSD | X86_CR4_DE\
 			  | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_MCE     \
-			  | X86_CR4_PGE | X86_CR4_PCE | X86_CR4_OSFXSR  \
+			  | X86_CR4_PGE | X86_CR4_PCE | X86_CR4_OSFXSR | X86_CR4_PCIDE \
 			  | X86_CR4_OSXSAVE | X86_CR4_SMEP | X86_CR4_RDWRGSFS \
 			  | X86_CR4_OSXMMEXCPT | X86_CR4_VMXE))
 
@@ -661,6 +662,7 @@ struct kvm_x86_ops {
 	u64 (*get_mt_mask)(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio);
 	int (*get_lpage_level)(void);
 	bool (*rdtscp_supported)(void);
+	bool (*invpcid_supported)(void);
 	void (*adjust_tsc_offset)(struct kvm_vcpu *vcpu, s64 adjustment, bool host);
 
 	void (*set_tdp_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
diff --git a/arch/x86/include/asm/processor-flags.h b/arch/x86/include/asm/processor-flags.h
index f8ab3ea..aea1d1d 100644
--- a/arch/x86/include/asm/processor-flags.h
+++ b/arch/x86/include/asm/processor-flags.h
@@ -44,6 +44,7 @@
  */
 #define X86_CR3_PWT	0x00000008 /* Page Write Through */
 #define X86_CR3_PCD	0x00000010 /* Page Cache Disable */
+#define X86_CR3_PCID_MASK 0x00000fff /* PCID Mask */
 
 /*
  * Intel CPU features in CR4
@@ -61,6 +62,7 @@
 #define X86_CR4_OSXMMEXCPT 0x00000400 /* enable unmasked SSE exceptions */
 #define X86_CR4_VMXE	0x00002000 /* enable VMX virtualization */
 #define X86_CR4_RDWRGSFS 0x00010000 /* enable RDWRGSFS support */
+#define X86_CR4_PCIDE	0x00020000 /* enable PCID support */
 #define X86_CR4_OSXSAVE 0x00040000 /* enable xsave and xrestore */
 #define X86_CR4_SMEP	0x00100000 /* enable SMEP support */
 
diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
index 31f180c..b81525c 100644
--- a/arch/x86/include/asm/vmx.h
+++ b/arch/x86/include/asm/vmx.h
@@ -60,6 +60,7 @@
 #define SECONDARY_EXEC_WBINVD_EXITING		0x00000040
 #define SECONDARY_EXEC_UNRESTRICTED_GUEST	0x00000080
 #define SECONDARY_EXEC_PAUSE_LOOP_EXITING	0x00000400
+#define SECONDARY_EXEC_ENABLE_INVPCID		0x00001000
 
 
 #define PIN_BASED_EXT_INTR_MASK                 0x00000001
@@ -281,6 +282,7 @@ enum vmcs_field {
 #define EXIT_REASON_EPT_MISCONFIG       49
 #define EXIT_REASON_WBINVD		54
 #define EXIT_REASON_XSETBV		55
+#define EXIT_REASON_INVPCID		58
 
 /*
  * Interruption-information format
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 7df1c6d..4035617 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -201,6 +201,7 @@ static int do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
 	unsigned f_lm = 0;
 #endif
 	unsigned f_rdtscp = kvm_x86_ops->rdtscp_supported() ? F(RDTSCP) : 0;
+	unsigned f_invpcid = kvm_x86_ops->invpcid_supported() ? F(INVPCID) : 0;
 
 	/* cpuid 1.edx */
 	const u32 kvm_supported_word0_x86_features =
@@ -228,7 +229,7 @@ static int do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
 		0 /* DS-CPL, VMX, SMX, EST */ |
 		0 /* TM2 */ | F(SSSE3) | 0 /* CNXT-ID */ | 0 /* Reserved */ |
 		F(FMA) | F(CX16) | 0 /* xTPR Update, PDCM */ |
-		0 /* Reserved, DCA */ | F(XMM4_1) |
+		F(PCID) | 0 /* Reserved, DCA */ | F(XMM4_1) |
 		F(XMM4_2) | F(X2APIC) | F(MOVBE) | F(POPCNT) |
 		0 /* Reserved*/ | F(AES) | F(XSAVE) | 0 /* OSXSAVE */ | F(AVX) |
 		F(F16C) | F(RDRAND);
@@ -248,7 +249,7 @@ static int do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
 	/* cpuid 7.0.ebx */
 	const u32 kvm_supported_word9_x86_features =
 		F(FSGSBASE) | F(BMI1) | F(HLE) | F(AVX2) | F(SMEP) |
-		F(BMI2) | F(ERMS) | F(RTM);
+		F(BMI2) | F(ERMS) | f_invpcid | F(RTM);
 
 	/* all calls to cpuid_count() should be made on the same cpu */
 	get_cpu();
diff --git a/arch/x86/kvm/cpuid.h b/arch/x86/kvm/cpuid.h
index 26d1fb4..e531d39 100644
--- a/arch/x86/kvm/cpuid.h
+++ b/arch/x86/kvm/cpuid.h
@@ -51,4 +51,12 @@ static inline bool guest_cpuid_has_osvw(struct kvm_vcpu *vcpu)
 	return best && (best->ecx & bit(X86_FEATURE_OSVW));
 }
 
+static inline bool guest_cpuid_has_pcid(struct kvm_vcpu *vcpu)
+{
+	struct kvm_cpuid_entry2 *best;
+
+	best = kvm_find_cpuid_entry(vcpu, 1, 0);
+	return best && (best->ecx & bit(X86_FEATURE_PCID));
+}
+
 #endif
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index f75af40..81ed0ba 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -4044,6 +4044,11 @@ static bool svm_rdtscp_supported(void)
 	return false;
 }
 
+static bool svm_invpcid_supported(void)
+{
+	return false;
+}
+
 static bool svm_has_wbinvd_exit(void)
 {
 	return true;
@@ -4312,6 +4317,7 @@ static struct kvm_x86_ops svm_x86_ops = {
 	.cpuid_update = svm_cpuid_update,
 
 	.rdtscp_supported = svm_rdtscp_supported,
+	.invpcid_supported = svm_invpcid_supported,
 
 	.set_supported_cpuid = svm_set_supported_cpuid,
 
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 32eb588..21d66dd 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -849,6 +849,12 @@ static inline bool cpu_has_vmx_rdtscp(void)
 		SECONDARY_EXEC_RDTSCP;
 }
 
+static inline bool cpu_has_vmx_invpcid(void)
+{
+	return vmcs_config.cpu_based_2nd_exec_ctrl &
+		SECONDARY_EXEC_ENABLE_INVPCID;
+}
+
 static inline bool cpu_has_virtual_nmis(void)
 {
 	return vmcs_config.pin_based_exec_ctrl & PIN_BASED_VIRTUAL_NMIS;
@@ -1739,6 +1745,11 @@ static bool vmx_rdtscp_supported(void)
 	return cpu_has_vmx_rdtscp();
 }
 
+static bool vmx_invpcid_supported(void)
+{
+	return cpu_has_vmx_invpcid() && enable_ept;
+}
+
 /*
  * Swap MSR entry in host/guest MSR entry array.
  */
@@ -2458,7 +2469,8 @@ static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf)
 			SECONDARY_EXEC_ENABLE_EPT |
 			SECONDARY_EXEC_UNRESTRICTED_GUEST |
 			SECONDARY_EXEC_PAUSE_LOOP_EXITING |
-			SECONDARY_EXEC_RDTSCP;
+			SECONDARY_EXEC_RDTSCP |
+			SECONDARY_EXEC_ENABLE_INVPCID;
 		if (adjust_vmx_controls(min2, opt2,
 					MSR_IA32_VMX_PROCBASED_CTLS2,
 					&_cpu_based_2nd_exec_control) < 0)
@@ -3731,6 +3743,8 @@ static u32 vmx_secondary_exec_control(struct vcpu_vmx *vmx)
 	if (!enable_ept) {
 		exec_control &= ~SECONDARY_EXEC_ENABLE_EPT;
 		enable_unrestricted_guest = 0;
+		/* Enable INVPCID for non-ept guests may cause performance regression. */
+		exec_control &= ~SECONDARY_EXEC_ENABLE_INVPCID;
 	}
 	if (!enable_unrestricted_guest)
 		exec_control &= ~SECONDARY_EXEC_UNRESTRICTED_GUEST;
@@ -6467,6 +6481,23 @@ static void vmx_cpuid_update(struct kvm_vcpu *vcpu)
 			}
 		}
 	}
+
+	exec_control = vmcs_read32(SECONDARY_VM_EXEC_CONTROL);
+	/* Exposing INVPCID only when PCID is exposed */
+	best = kvm_find_cpuid_entry(vcpu, 0x7, 0);
+	if (vmx_invpcid_supported() &&
+	    best && (best->ecx & bit(X86_FEATURE_INVPCID)) &&
+	    guest_cpuid_has_pcid(vcpu)) {
+		exec_control |= SECONDARY_EXEC_ENABLE_INVPCID;
+		vmcs_write32(SECONDARY_VM_EXEC_CONTROL,
+			     exec_control);
+	} else {
+		exec_control &= ~SECONDARY_EXEC_ENABLE_INVPCID;
+		vmcs_write32(SECONDARY_VM_EXEC_CONTROL,
+			     exec_control);
+		if (best)
+			best->ecx &= ~bit(X86_FEATURE_INVPCID);
+	}
 }
 
 static void vmx_set_supported_cpuid(u32 func, struct kvm_cpuid_entry2 *entry)
@@ -7201,6 +7232,7 @@ static struct kvm_x86_ops vmx_x86_ops = {
 	.cpuid_update = vmx_cpuid_update,
 
 	.rdtscp_supported = vmx_rdtscp_supported,
+	.invpcid_supported = vmx_invpcid_supported,
 
 	.set_supported_cpuid = vmx_set_supported_cpuid,
 
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index be6d549..a9f88bf 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -528,6 +528,9 @@ int kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
 			return 1;
 	}
 
+	if (!(cr0 & X86_CR0_PG) && kvm_read_cr4_bits(vcpu, X86_CR4_PCIDE))
+		return 1;
+
 	kvm_x86_ops->set_cr0(vcpu, cr0);
 
 	if ((cr0 ^ old_cr0) & X86_CR0_PG) {
@@ -604,10 +607,20 @@ int kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
 				   kvm_read_cr3(vcpu)))
 		return 1;
 
+	if ((cr4 & X86_CR4_PCIDE) && !(old_cr4 & X86_CR4_PCIDE)) {
+		if (!guest_cpuid_has_pcid(vcpu))
+			return 1;
+
+		/* PCID can not be enabled when cr3[11:0]!=000H or EFER.LMA=0 */
+		if ((kvm_read_cr3(vcpu) & X86_CR3_PCID_MASK) || !is_long_mode(vcpu))
+			return 1;
+	}
+
 	if (kvm_x86_ops->set_cr4(vcpu, cr4))
 		return 1;
 
-	if ((cr4 ^ old_cr4) & pdptr_bits)
+	if (((cr4 ^ old_cr4) & pdptr_bits) ||
+	    (!(cr4 & X86_CR4_PCIDE) && (old_cr4 & X86_CR4_PCIDE)))
 		kvm_mmu_reset_context(vcpu);
 
 	if ((cr4 ^ old_cr4) & X86_CR4_OSXSAVE)
@@ -626,8 +639,12 @@ int kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
 	}
 
 	if (is_long_mode(vcpu)) {
-		if (cr3 & CR3_L_MODE_RESERVED_BITS)
-			return 1;
+		if (kvm_read_cr4(vcpu) & X86_CR4_PCIDE) {
+			if (cr3 & CR3_PCID_ENABLED_RESERVED_BITS)
+				return 1;
+		} else
+			if (cr3 & CR3_L_MODE_RESERVED_BITS)
+				return 1;
 	} else {
 		if (is_pae(vcpu)) {
 			if (cr3 & CR3_PAE_RESERVED_BITS)
-- 
1.7.1

Re: [PATCH v5] KVM: x86: Implement PCID/INVPCID for guests with EPT

[Avi Kivity]

On 07/02/2012 04:18 AM, Mao, Junjie wrote:
> This patch handles PCID/INVPCID for guests.
> 
> Process-context identifiers (PCIDs) are a facility by which a logical processor
> may cache information for multiple linear-address spaces so that the processor
> may retain cached information when software switches to a different linear
> address space. Refer to section 4.10.1 in IA32 Intel Software Developer's Manual
> Volume 3A for details.
> 
> For guests with EPT, the PCID feature is enabled and INVPCID behaves as running
> natively.
> For guests without EPT, the PCID feature is disabled and INVPCID triggers #UD.
> 

Thanks, applied.


-- 
error compiling committee.c: too many arguments to function